The pages are in English; this contents, the search and the buttons are in Japanese.

Sources of the dimensions

Every number in src/geometry.ts (in feet; src/units.ts converts them to the unit each rulebook states) is a fact from a rule or a published figure. This file says where, and says plainly where the figure is ours: a number the sources do not give, drawn as a reasonable reading, is marked ours. No text, table or drawing of a source is copied.

Football#

Ours. The CFL's numerals: the rulebook text read does not give their size or place, so they are drawn as the NFL's. CFL hash marks are drawn at every yard (Wikipedia) although the rulebook text names the 5-yard stripes. The IFAF's end zone is its usual 10 yards (the rules allow 7). The 6-foot NFL boundary band is drawn at its width; the others at about a foot. In a tall drawing the numbers' digits stand side by side on the screen, which is along the field's width.

The CFL is to change in 2027 (100 yards between the goal lines, 15-yard end zones, posts on the end line); a drawing without a year is of the field as it is now, and year: 2027 draws the planned one (see Surfaces through the years).

Hockey#

Rule 1.9, the hash marks. The rule reads: "At the outer edge of both sides of each face-off circle and parallel to the goal line shall be marked two red lines, two inches (2'') wide and two feet (2') in length and five feet seven inches (5'7") apart." The lines run parallel to the goal line, so the 2 inches of width lie across the other way and add nothing to the distance between them: the 5 feet 7 inches is the gap between the near ends of the two marks on one side of a circle, and each mark runs 2 feet out from it. That is what is drawn (NHL.hashApart); an earlier version of this package drew 5 feet 11 inches, adding the lines' width to a gap it does not enter. The rule does not say which end of a line "apart" is taken from; the gap between the near ends is the plain reading, and CBS Sports, "NHL adopts modification to face-off circle hash marks for 2014-15" (6 October 2014, https://www.cbssports.com/nhl/news/nhl-adopts-modification-to-face-off-circle-hash-marks-for-2014-15) says the NHL moved the marks from 3 feet apart to 5 feet 7 inches, "more in line with" international ice. The 2014-15 move is drawn as a change (nhl.hashApart.2014): the marks stood 3 feet apart before it, as the 2012-13 rulebook (Rule 1.9: "three feet (3') apart", read in the NHL's PDF) and the joint NHL and NHLPA release of 6 October 2014 both say, and 5 feet 7 inches from 2014-15. The 3 feet is cited from the 2012-13 rulebook, the earliest read, so seasons before 2012-13 are a gap in rulesFor("nhl", year).gaps and are drawn at 3 feet; the AHL, ECHL, OHL, WHL and PWHL have no dated history for their marks and keep 5 feet 7 inches in every season.

Rule 1.8 and Rule 27.8, the trapezoid. The NHL Official Rules of 2024-25, 2025-26 and 2026-27 all print both, and they disagree. Rule 1.8, Goalkeeper's Restricted Area: "Seven feet (7') outside of each goal crease (eight feet (8') from each goal post), a two-inch (2") red line shall be painted extending from the goal line to a point on the end of the rink ten feet (10') from the goal crease (eleven feet (11') from the goal post)". With the posts 6 feet apart inside (Rule 2.1) that is 6 + 2 x 8 = 22 feet at the goal line and 6 + 2 x 11 = 28 feet at the boards. Rule 27.8, Restricted Area: "lines that begin six feet (6') from either goal post and extend diagonally to points twenty-eight feet (28') apart at the end boards", which makes 6 + 2 x 6 = 18 feet at the goal line, the figure of 2005-06 to 2013-14 (the 2014 widening moved each line 2 feet out). Rule 27.8 is the penalty rule, and its 18 feet is the old figure; the painted line is Rule 1.8's, and the package draws 22 feet, the figure of Rule 1.8 and of the 2014-15 widening. The rule texts were read in the books at https://media.nhl.com/site/asset/public/ext/2025-26/2025-26Rules.pdf, https://media.nhl.com/site/asset/public/ext/2024-25/2024-25Rules.pdf and https://media.nhl.com/site/asset/public/ext/2026-27/2026-27Rules.pdf; the diagrams on their pages iv and v were not read. The PWHL's Rule 27.8 says it applies no restricted area.

Ours. The trapezoid's dates (18 feet from 2005-06, 22 from 2014-15) are read from the two Wikipedia articles above. Line widths are drawn thicker than painted unless exactLines is set.

Basketball#

Ours. The centre court's inner circle (2-foot radius) and the places of the lane space marks (7, 11, 14 and 17 feet from the baseline, the first drawn heavier as the block) are read from the court diagram, which was not available as text. The painted keys and the wood are style, not dimensions.

Baseball#

Ours. The warning track (15 feet, the usual), the infield's grass diamond, the home and base circles of dirt and the mowing arcs are style. The bases, the plates and the mound are drawn larger than life unless exactLines is set. The fence of each park is a curve through its published distances: see references.md for how the angles were chosen.

Ballparks#

The fence distances of the 30 current MLB parks, the 44 past ones and the 20 NPB parks are in scripts/parks.data.json, each with the article and revision it was read from. Each figure is a distance in feet (MLB) or metres (NPB) as the article gives it. The angle at which a distance is taken is not published and is ours: the foul-line figures are at 45 degrees either side of dead centre, the middle at 0, and a figure labelled left-center or right-center at 22.5 degrees unless a park has more than one, in which case they are spread between the line and the middle in the order the article lists them. A fence is a monotone cubic through the points, so it never goes beyond them.

The NPB parks of the past (Hiroshima Municipal Stadium, Korakuen, Osaka Stadium, Heiwadai, Kawasaki, Nagoya Stadium) are drawn with the figures of the article for the park as it was, as the Japanese article gives them (Korakuen and Kawasaki by their measured distances, not their announced ones).

The MLB parks of the past are read the same way, from the English article of each at the revision cited in NOTICE.md; where an article dates more than one fence (the Polo Grounds, Shibe Park, Huntington Avenue Grounds and others) each is kept as a period with its first and last season, and year picks one. A ground whose article gives no distances is not in PARKS; the list is in references.md.

Curling#

Ours. The stone's drawn size (a circle of 36 inches, the most the rules allow), the colours of the house (blue 12-foot band, white 8-foot band, red 4-foot band, white button, which neither book prints), the colour of the hog line, the place of the board, and the width of Curling Canada's hacks. The sheet's apron is not set by the rules. Both books print metres and feet; the feet are used to draw, and wcf's figures are kept in the metres it prints first (so 45.72 and 4.75 m, which are 150 ft and 15.583 ft to the thousandth of a foot, and a tee line 17.375 m from the middle, which is 57.003 ft against Curling Canada's 57). The books say nothing of the colour of a stone's handle; red and yellow are the usual.

The net sports#

Tennis, volleyball (indoor, beach and sitting), badminton, pickleball, table tennis, padel, squash, racquetball, sepak takraw, teqball, roundnet and netball (the page). Each rulebook's figures are in src/leagues/courts.ts in the unit it prints first and are held by src/courts.test.ts, one test for each rule below. A court is measured, as each book measures it, to the outside edge of its lines. The documents, with the edition and the address read on 2026-10-13, are in LEAGUE_SOURCES (itf-rules, fivb-volleyball, fivb-beach, bwf-laws, usap-rulebook, ittf-laws, wpv-sitting, fip-padel, wsf-court-specs, wsf-singles-rules, irf-racquetball-rules, irf-racquetball-courts, istaf-law, fiteq-rules, roundnet-rules, world-netball-rules). Only dimensions and the rules of scoring are taken from them, as facts; no text and no diagram of any is copied. Where a rulebook is copyrighted (the IRF's, the FITEQ's, World Netball's, the FIP's by its footer) that is the whole of the use; the licence notes are in references.

Tennis#

Rules of Tennis, International Tennis Federation, 2026. The ITF's own server refused an automated download, so the text was read in Tennis Canada's Rules of the Court 2026 (https://assets.tenniscanada.com/production/Rules-of-the-Court-2026.pdf), which prints the ITF's rules in full with its own notes marked "TC Note"; only the ITF's text was used.

Ours. The colours of the four looks. The service line's place: the rule measures to the outside of the lines and the figure is taken to the edge nearer the baseline, so the service box is 21 ft deep to the outer edge of its line. The centre mark is drawn from the inside edge of the baseline. The lines are drawn 2 in wide, the greatest of the rule's 1 to 2 in. The sizes of the net's line, and of the singles sticks' and posts' marks (the posts at the greatest 6 in, the sticks 3 in). Rule 1's courts for 10-and-under play (Appendix VIII) are not drawn.

Volleyball and beach volleyball#

Official Volleyball Rules 2025-2028 and Official Beach Volleyball Rules 2025-2028, FIVB, approved by the 39th FIVB World Congress 2024 and in force from 1 January 2025.

Ours. The colours; the front zone is painted a little apart from the back (Rule 1.2.2 allows a court of two colours for the front and back zones); the marks for the posts and antennae (the rules give a post no diameter and an antenna a diameter of 10 mm, too small to see at the scale of a court, so a mark of a least size is drawn at the figure's place). official draws the FIVB competitions' figures (the 5 m and 6.5 m free zone, the extension of the attack line, the posts 1 m out) and least the rules' least (3 m, no extension, the posts 0.5 m out, or 0.7 m on the beach). The net drawn is the 10 m one indoors and the 8.5 m one on the beach (the 8.0 m net the beach rules allow in FIVB competitions is not drawn). The NCAA's and USA Volleyball's own rule books were not read.

Badminton#

Laws of Badminton, Badminton World Federation, as amended and adopted by the BWF on 26 April 2025 (https://worldbadminton.com/laws/rules_2025.htm). The BWF's page says the 2026 amendments take effect on 4 January 2027 and that the 2025 Laws apply until then; the amended Laws could not be read (the page that should hold them answered "Not Found"), and Law 1 was not among the changes the page names. The figures of Diagram A are read from its picture (https://worldbadminton.com/laws/images/courtDiagram.png), in millimetres.

Ours. The colours; the sizes of the posts' marks; the figures of the net's depth and height are held and not drawn (a plan view). The BWF's Laws give no figure for the ground round the court, so none is drawn.

Pickleball#

USA Pickleball Official Rulebook, 2026, Section 3 Court and Equipment, as hosted by Pickleball Canada (https://pickleballcanada.org/wp-content/uploads/2026/03/2026-Official-Rulebook-EN.pdf).

Ours. The colours; the non-volley zone is painted a little apart from the rest of the court; the posts are drawn 1 ft outside each sideline (22 ft apart, inside to inside, less the court's 20 ft, halved) at their greatest diameter of 3 in.

Table tennis#

Laws of Table Tennis, International Table Tennis Federation, 2026 statutes, as reproduced by Table Tennis England in The Laws of Table Tennis, issue 1, July 2026 (https://www.tabletennisengland.co.uk/content/uploads/2026/07/Laws-of-Table-Tennis-2026-27.pdf). The ITTF Handbook itself was not read.

Ours. The colours; the post's width (a mark of a least size). The playing area round a table is in the ITTF's regulations, not in the Laws, and was not read: no free zone is drawn.

Sitting volleyball#

Official Sitting Volleyball Rules 2025-2028, World ParaVolley, the English text of 25 July 2025 (https://worldparavolley.org/wp-content/uploads/2025/09/2025-2028-WPV-Official-Sitting-Volleyball-Rules-English-2025-07-25.pdf). It is league: "wpv-sitting" of volleyball, drawn by the same code as the FIVB's court with these figures.

Ours. The same as the FIVB's indoor court, but for the look: the wooden floor is the only one offered, since the Rules ask for a light floor and white lines (no blue floor, no sand with its blue lines). The front zone painted a little apart, the marks for the posts and antennae, the official and least figures (4 and 6 m, and 3 m all round; the posts 1 and 0.5 m out).

Padel#

Rules of Padel, International Padel Federation (FIP), review of application 1 January 2026 (https://www.padelfip.com/wp-content/uploads/2025/12/FIP_Rules-of-Padel.pdf). The part of the Rules that describes the court is headed, not numbered ("The Court": "Dimensions", "Net", "Enclosures", "Ground surface").

Ours. The colours (the three the Rules prefer, with white lines, which they prefer too). The service line is placed with its outside edge 6.95 m from the net (the Rules do not say which edge). The thickness of the walls and of the fence, and the size of the post's mark. Both side-wall variants have a wall 4 m long at each end of each side, so that is what is drawn; the steps' heights and the doors (The Court: Access) are not.

Squash#

Specifications for Squash Courts, World Squash Federation (World Squash), 28 November 2017 (https://www.worldsquash.sport/wp-content/uploads/2021/08/171128_Court-Specifications.pdf), which World Squash's page says applies in 2026, a transition year in which new specifications for each product are being published. The scoring is in World Squash Singles Rules 2024 (effective 1 January 2024), read in Squash Ireland's copy (https://www.squashireland.ie/wp-content/uploads/2025/04/Rules-of-Singles-Squash-2024-V1.2.pdf), because World Squash's own copy was not found.

Ours. The colours: the specification does not ask for red lines (it asks that markings contrast, 5.01.01 and 10.13), so red is ours, as the colour squash lines are painted, a dark red on the light floor and a pale red on the dark one, drawn on the floor and on the front wall in the wooden look, and on the front wall alone in the blue look (white on the floor). The thickness of the walls drawn round the court, and the front wall laid flat beside it (its lines at their heights, to the left of the court). The side wall line and the back wall line are not drawn.

Racquetball#

Official Rules 2026-2028, Indoor Racquetball, International Racquetball Federation (IRF), March 2026 (https://www.internationalracquetball.com/wp-content/uploads/2026/06/1-irf-rulebook_mar26-1.pdf), and the IRF's Racquetball Court Specifications (2025: https://www.internationalracquetball.com/wp-content/uploads/2026/07/IRF_Courts-specifications-2025.pdf). The IRF's rules are copyrighted: only these dimensions are used.

Ours. The colours of the floor (a light wood, so that the red lines read at 3:1; the lines are the IRF's recommended red, blue on the convertible look), the thickness of the walls, the line width of 1 1/2 inches (the greatest of the Rules' 1 to 1 1/2). The out-of-court line and the screen lines are not drawn.

Sepak takraw#

Law of the Game (Regu team event), International Sepaktakraw Federation (ISTAF), 2013, dated 9 December 2013, in the copy Sepaktakraw India hosts (https://sepaktakrawindia.com/wp-content/uploads/2022/04/REGU_TEAM-EVENT.pdf). ISTAF's own site refused a connection from a program (it serves a certificate that is not its own), so no later edition was read; Bernama reported in 2025 that ISTAF keeps the court of 13.4 by 6.1 m, and that a committee was reviewing the service circle's rule (the foot, not the circle's size).

Ours. The colours, the radius of a circle taken to the outside of its line (the Law gives none), and the quarter circles' line width (the service circle's, 0.04 m). Each quarter circle is drawn inside the court on its side of the net, so there are four.

Teqball#

The Official Rules and Regulations of Teqball, FITEQ (the International Teqball Federation), 2026 (https://cdn.buttercms.com/s6Mb1gRkRJuFP38kpMTh). The rules are copyrighted: only these dimensions are used.

Ours. The colours (the rules ask only that the table, floor, surrounds and ball differ), the greatest line width of 50 mm, the service line's axis at 3.5 m (the rules give no edge), and the thickness of the surrounds. The court drawn is the least, 16 by 12 m, which is what the rules fix.

Roundnet#

International Roundnet Federation Rules, adopted 21 October 2022 (https://www.roundnetfederation.org/s/IRF-Rules-10212021docx-1.pdf), Chapter 1.

Ours. The colours, the widths of the lines and of the marks (the rules give none), the set drawn as a disc with its rim, and the court as the recommended square (a square has no sides, so orientation: "portrait" draws it the same).

Netball#

Rules of Netball, World Netball, 2024 edition (https://netball.sport/wp-content/uploads/2024/01/World-Netball-Rules-Book-2024.pdf), Rule 1 Technical specifications, Court and related areas. The rules are copyrighted: only these dimensions are used; World Netball's facilities page (https://netball.sport/game/facilities-and-equipment/) gives the same figures.

Ours. The colours, the radii taken to the outside of the lines, the transverse lines centred on the thirds (the line is common to both areas), the pole drawn at its greatest, 100 mm, the ring seen from above, and a score that is the usual one, not a board.

The field sports#

Lacrosse, rugby, Australian football, Gaelic games, cricket, field hockey and handball (the page). Each rulebook's figures are in src/leagues/ (lacrosse.ts, rugby.ts, aussie.ts, gaelic.ts, cricket.ts, fieldhockey.ts, handball.ts) in the unit it prints first and are held by one test file a sport (src/rugby.test.ts and the rest), a test for each rule below. The documents, with the edition and the address read on 2026-10-13, are in LEAGUE_SOURCES. Each was read as text from the governing body's own PDF; where a figure is only on a diagram it was read off the diagram and the table says so. Where a book gives a range, the range is kept (Span in src/leagues/fields.ts) and the size drawn is the greatest unless this says another. The lines of each sport are placed as its rulebook measures them (to the outside edge, to the inside edge or to the centre of a line, where it says), and a line's drawn width is a little more than its true width unless exactLines is set.

Rugby union#

Laws of the Game, Rugby Union, Law 1 "The ground", World Rugby, 2026 (the book's own label: "Laws of the game Rugby Union, incorporating the playing charter, 2026"; it prints no date of effect), https://passport.world.rugby/media/jxrnmptk/2026en-laws-of-the-game-compressed.pdf, pages 26 to 28.

Ours. The width of the lines: Law 1 prints none, and 0.1 m is drawn. The depth of the in-goal drawn, 10 m, which is inside the Law's range of 6 to 22 m. Where the dashes stand along each dash line (a first dash from the 5 m line to 10 m, then one centred on each 22-metre line, 10-metre line and the half-way line, then one ending 5 m from the far try line; across the field at 5 m from the try lines dashes centred 5 m either side of the middle and on the 5 m and 15 m lines, and at the 10-metre lines also on the middle and 10 m either side): the Law gives the length of a dash and the lines they lie on, and the places are read off the ground diagram. How much a shorter field's lines are reduced: proportionally. The technical zones of the diagram (10 m by 3 m, 2 m from the touchline) are not drawn: their place along the touchline is not labelled.

Rugby league#

Rugby League Laws of the Game, International Level, with Notes on the Laws and NRL Telstra Premiership Interpretations, NRL, 2023 edition (April 2023), Section 1 "The Playing Field" and Section 18 "Ground Markings and Dimension Guidelines", https://Nrl.Com/siteassets/operations/the-game/nrl-international-rules-book-2023.pdf. The International Laws of the Game and Notes on the Laws, International Rugby League, 2024 (the cover's year), Section 1 and its plan, https://intrl.sport/uploads/docs/international-rugby-league-laws-of-the-game-2022%20%283%29.pdf.

Ours. The IRL's in-goal drawn at 8 m (the NRL's, inside its range of 6 to 11 m); its line width and colours, which its book does not print: the NRL's 15 cm, white. The scrum lines' dashes: the notes say the broken lines "shall consist of marks or dots on the ground not more than 2 metres apart", so 1 m marks and 1 m gaps are drawn. The NRL's media line (1.5 m from each touchline, 10 cm, red) is not drawn: no length is given. The plan's other broken lines and the numbers on the field are not drawn.

Australian football#

Laws of Australian Football, Law 3 "Playing Surface and Posts" and its Diagram 1, AFL, 2026, https://play.afl/sites/default/files/2026-02/Laws%20of%20Australian%20Football%202026.pdf, pages 18 to 20.

Named grounds, the length by the width in metres that the AFL's venue page prints under "Ground dimensions" (afl.com.au/venues/N, read 2026-10-13): MCG 160 by 141 (13), Optus Stadium 165 by 130 (65), the Gabba 156 by 138 (22), the SCG 149 by 136 (9), Marvel Stadium 159.5 by 128.8 (3) and GMHBA Stadium 170 by 114 (15). Other published figures disagree a little (an AFL article of 2018 prints 161 by 138 for the MCG, 155 by 136 for the SCG and 170 by 116 for GMHBA Stadium), and the pages do not say what they measure; only the stadium's own fact sheet says, for Optus Stadium, "boundary line to boundary line". Adelaide Oval's page prints 190 by 125 m, a length beyond the Laws' 185 m, so it is not drawn.

Ours. The shape: the Laws say "oval" and draw one; it is an ellipse of the ground's width across and a length such that, at the Goal Line, it is as wide as the Goal Line and the two Behind Lines together (19.2 m), the ends being cut by them as Diagram 1 shows; the Fifty Metre Arc runs between the places it meets the Boundary Line. The width of the lines (Law 3 prints none: 0.1 m). The size drawn, the MCG's, since the Laws give a range. The interchange area (15 m wide, on a wing: the Laws give no place) and the nine-metre line of Law 20 are not drawn.

Gaelic football and hurling#

Official Guide Part 2 (the playing rules of hurling and football), Rules of Specification, Rule 1 "The Field of Play", Gaelic Athletic Association, effective from 27 March 2026 (the edition effective from 10 March 2025 has Rule 1 word for word the same), https://www.gaa.ie/api/images/image/upload/t_q-best/prd/xi4oyuttzqpaqr2vfhbn.pdf, pages 4 to 6.

Ours. The 65 m lines are drawn for hurling only, as the Guide marks them "(Hurling)". Whether the dashes of the midline begin at once or after a gap is not said: they begin where the midline ends. The Guide's diagram (an image) was not read. The substitution zone (Rule 1.6, 5 m either side of the centre line, on the sideline) is not drawn. The 20 m arc of the set-play rules is Rule 1.4's 13 m arc.

Cricket#

The Laws of Cricket (2017 Code), 4th Edition 2026, MCC, Laws 6, 7 and 8, https://www.lords.org/getmedia/1d908298-5c44-468d-b6a7-e1414a1296e0/Laws-of-Cricket-2017-Code-4th-Edition-(2026)_3.pdf. ICC Men's One-Day International Playing Conditions, effective from October 2026, clauses 6 to 8, 19.1, 28.7.2.1 and Appendix C, https://images.icc-cricket.com/image/upload/prd/bxkzkcyvfn6tvi70zh0w.pdf (the men's Test and T20I conditions' 19.1.3 is the same, and the T20I's 28.7.3 the same circle); ICC Women's One-Day International Playing Conditions, effective from October 2026, 19.1.3 and 28.7.2.1, https://images.icc-cricket.com/image/upload/prd/qunpw1kfh3ibxlz58jlw.pdf.

Ours. The width of the creases (the Laws print none: 2 inches, drawn thin beside the ground). The boundary drawn, 75 yards for the men and the Laws' league and 65 for the women, inside each range; the boundary is a parameter. The pitch's colour. The league icc-men is the ground with the 30-yard circle, which applies in limited-overs cricket (ODI and T20I); the Test conditions have none. Not drawn: Appendix C's wide guidelines and protected-area indicators, whose figures (17 in, 1 ft) are labels of a diagram, the sight screens and the run-ups.

Field hockey#

Rules of Hockey including explanations, Rule 1 and the "Field and Equipment Specifications" 1.1 to 1.8, FIH, effective from 1 March 2026, https://www.fih.hockey/static-assets/pdf/fih-Rules-of-hockey-2026-final.pdf, pages 14 and 55 to 62.

Ours. The goal's depth drawn, 1.20 m (the least the Rules allow at the ground). The posts are 50 mm wide (Specifications 1.5 b), which sets the corner marks' places from their outer edges. The clause numbers of Rule 1 (page 14) are read from a text whose labels were separated from their sentences: the table cites the Specifications, whose numbers are clear. Not drawn: the run-off areas and the side-boards and back-boards (1.6).

Team handball#

IX. Rules of the Game for Indoor Handball, Rule 1 "Playing Court", IHF, edition of 1 July 2025, https://www.ihf.info/sites/default/files/2025-07/09A%20-%20Rules%20of%20the%20Game_Indoor%20Handball_E.pdf, pages 4 to 7; and the Guidelines for Playing Courts and Goals, V, which are not part of the rules.

Ours. The substitution lines' end marks are drawn on one side line (the book's diagram image was not read). The free-throw line is cut where it meets the side lines: the goal area is 15 m across at the goal line and the line stands 3 m outside it, so it would be 21 m across, more than the court's 20 m. The colours: the floor and the goal areas' paint. Not drawn: the coaching zone (1:11), the benches and the table.

Lacrosse#

Ours. Where a book prints a range the greatest is drawn (the NCAA women's, whose book names an optimal size, draws that). The NLL's line width, which its book does not print: World Lacrosse's 2 in is drawn. The width of the face-off circle's line, the men's field's X (World Lacrosse says "X" or a 10 cm square) and the net's depth in World Lacrosse's women's book (it prints none: the men's 2.1 m is drawn). The crease's flat is read as one foot behind the apex of the goal's poles, where Diagram B draws it (the text says "one foot from the point of the base of the goal"), the apex being as far behind the goal line as poles of 4 ft 6 in meeting over a goal 4 ft 9 in wide allow. The two-point arc's straight parts end where the arc of 15 yards begins, which is 7.48 yards from the goal line extended (the book says "until it reaches 15 yards from the center of the goalline"). World Lacrosse's box rules also say the goals stand "25 m from the midline", which does not fit its own 200 ft and 12 ft; the feet are drawn. Not drawn: the benches, the penalty boxes, the timer's table, the substitution areas and the coaches' areas of every book, and the NLL's 10 ft radius at the table.

The pools#

Swimming, water polo, diving and artistic swimming (the page). The figures are in src/pool.figures.ts in metres, the unit the regulations print them in, and held by src/pool.test.ts. The document is World Aquatics' Competition Regulations, in force as from February 2026 ("CR (February 2026)"; a clause is cited by its part, "Part Two 15.6.2.1", because Parts Two and Four both have an Article 15), https://resources.fina.org/fina/document/2026/02/18/e6815ecc-06d9-4f0b-98e9-4c441cf5e6a3/2026-02-18_World-Aquatics_CR-Final.pdf, read as text on 2026-10-14: Part Two (Swimming Rules) Article 15, pages 68 to 74 of the document's own numbering; Part Four (Diving Rules) Article 15, pages 146 to 153, and Appendix 2 (Article 17.2), page 155; Part Six (Water Polo Rules) Article 20, page 241, and Article 21, pages 242 to 245; Part Seven (Artistic Swimming Rules) Article 12, pages 324 and 325. The figures were first read on 2026-10-13 from the edition in force as from 25 June 2025 ("June 2025", https://resources.fina.org/fina/document/2025/07/01/ed3110a4-2291-411d-8526-6f641bd9237a/Competition-Regulations_June-2025_Clean-updated-01.07.2025-.pdf: Part Two Article 16, Part Four Article 13, Part Six Article 18 and Appendices 3 and 4, Part Seven Article 27) and every citation below was then moved to the February 2026 numbering, each figure checked against the new text; where a number follows "June 2025" it is that edition's, kept for a reader of it. The same rules were the Facilities Rules FR 2 to FR 8: 2017-2021, version of 19 December 2017 (https://artisticswimming.ca/wp-content/uploads/2021/10/fina_facilities_2017-2021.pdf, "FR 2.x" in the table), and 2021-2025, version 5 August 2021 (https://resources.fina.org/fina/document/2022/02/08/77c3058d-b549-4543-8524-ad51a857864e/210805-Facilities-Rules_clean.pdf, where the swimming pool is FR 2.1 and the diving, water polo and artistic swimming facilities FR 3, FR 4 and FR 5). The diagrams of the regulations (Part Two Appendices 1 to 10 in Article 17, Part Four Appendices 1 and 3, Part Six Appendix 1, Part Seven Appendices 10 and 11) are pictures and were not read: nothing is measured from one.

The swimming pool#

Ours. The width of the lane marking is 0.25 m (the middle of the rule's 0.2 to 0.3). The depth of the section is the Olympic Games' 2.5 m for a 50 m pool and the 25 m World Championships' 2.0 m for a 25 m pool, unless the options say another; the height of the section is exaggerated. A block is drawn 0.7 m high in the section (between the rule's 0.5 and 0.75). The length of a run of distinct floats (0.6 m), the deck (2.5 m), the gutter (0.4 m), the lines' and fixtures' enlargement, the touch panels' drawn depth of 0.3 m, the standards' size, the colours and the tile sizes. The rules ask for no size or number of lanes for a warm-up pool, so one is a swimming pool without the competition fixtures. Not drawn: the backstroke ledge (Part Two 15.10; June 2025: CR 16.1.11), the lane rope's tension and anchors, the starting devices, the lighting and the water's temperature and turnover.

Water polo#

Ours. Before the June 2025 regulations the men's field was 30 m between the goal lines (FR 4.1.2, 2021-2025: "30.60 m x 20.00 m for men and 25.60 m x 20.00 m for women", the goal lines 30.00 and 25.00 m apart); the current text gives 25 m and 20 m "for men's and women's matches" and is followed. The pool is 25.6 m long (the field and 0.30 m behind each goal line, where the anchor points are). The post is drawn 80 mm square (Part Six 21.6.2.2: 75 to 80 mm) and then enlarged. The re-entry area is drawn inside the field in the corner, on the side away from the table, 1.08 m deep from the goal line (the text does not say whether it lies in or beyond the field). The official table's size (6.0 by 1.2 m) and place, the benches, the deck (3 m). Not drawn: the secretary's flags, the goal judges' places, the ball and caps.

Diving#

Ours. The preferred figure is drawn where the table gives two. The well is 25 m across (the width the lines' length is given for) and 21 m deep: the rules give clearances (D, J, K, L, M) and no size. The springboards stand from the left wall, 3 m boards outside, then the 1 m boards; the platforms from the right wall, the tallest at B from it; a well is made wider when the boards asked for do not fit (2 m clear between the last springboard and the platform stands). The stands behind the wall, the plummet marks, the colours and the heights' labels. Not drawn: the clearances overhead (E, F, G), the depth profile (J to M), the handrails, the judges' seats (Part Four 15.5; June 2025: CR 13.1.7), the bubbles of the surface agitation (Part Four 15.2.10; June 2025: 13.1.3.12) and the dry land.

Artistic swimming#

Ours. The sizes of the two platforms (2 by 1.2 m, and 12 by 1.4 m with seven chairs), the lines drawn as the lane markings are (2 m short of the walls, with a cross line), the deep part's place (in the middle of the area), and the plan's sides (the judges' platform along the top, the start at the bottom).

Athletics#

The athletics stadium (the page). The figures are in src/leagues/athletics.ts (the tracks and the stagger tables, in metres), src/athletics/ (the races, the geometry and the facilities) and are held by src/athletics.test.ts. The documents, with the edition and the address read, are in LEAGUE_SOURCES (wa-facilities-manual, wa-marking-plan, wa-technical-rules, wa-short-track-plan), all from World Athletics' own downloads: the Track and Field Facilities Manual (2019 edition, Chapters 1 to 3), its 400 Metre Standard Track Marking Plan (Figure 2.2.1.6a, 2019), Books C1.1 and C2.1 of the Competition and Technical Rules (in force 1 July 2026) and the Marking Plan for the Standard Short Track (Figure 8.3.6c, 1 January 2026). Each was read as text and the figures of a drawing were read off it where the text has none; no text, table or diagram is copied.

Ours. The colours of the tracks and of the ground. The cages' rear (an arc about the circle's centre). The covered track's bends, which the plan builds from ascending and descending sections and are drawn here as one circle of the same radius. The water jump's pit (its place on the diverted lap) and the water in it. The lane tags, the stencil digits (a face of our own, drawn as paths) and the sizes of every number. The reach at which a sector's grass ends. The places of the facilities, read off the Marking Plan at its scale of 1:350. The 60 m's start on the infield straight. Not drawn: the starting blocks, the officials' places, the photo-finish gantry, the benches, the sponsors' boards, the wind gauge.

Ice skating#

The skating rinks (the page). The figures are in src/leagues/skating.ts (the three rinks, in metres), src/skating/ (the geometry, the starts and the parts) and are held by src/skating.test.ts. The documents, with the edition and the address read, are in LEAGUE_SOURCES (isu-speed-skating-rules, isu-short-track-rules, isu-figure-skating-rules), all from the International Skating Union's own downloads: Sports Rules - Speed Skating (Special Regulations and Technical Rules, effective 12 June 2026) with its "H. Track" layout plan and measurements, the Special Regulations and Technical Rules Short Track Speed Skating (2024) and Sports Rules - Figure Skating (effective 12 June 2026). Each was read as text, and the layout plan, the short track's diagram and the tables as pictures; no text, table or diagram is copied.

Ours. The colours of the ice, the floor, the warm-up lane and the looks. The warm-up lane's lines (the Rules require the lane and name no marking). The padding's place (3 m from the outer edge, 0.3 m thick) and the crossing's straight line from lane to lane (the table's model). The blocks' size as drawn, and the angle of the short track's seven blocks (30 degrees apart: the diagram shows seven and the Rules give no angle). The short track's rink corner (8.5 m). The figure skating rink's corner and boards, and the place and size of the judges' seats, the referee's, the technical panel's table and the kiss and cry (the Rules give none; nine judges is the Olympic Winter Games' panel). The short track's lap is 111.11 m as S and C make it (the diagram prints 111.12 m). Not drawn: the lap counters, the officials' places on the long track, the cones of a team race's changeover and of a relay's exchange zone, the long track's start of a relay.

Judo, karate, kendo, sumo, kyudo and the dojo#

The budō surfaces (the page). The figures are in src/leagues/budo.ts (every rulebook's, in metres), src/budo/ (the plans, the tatami and the dojo builder) and are held by src/budo.test.ts. The documents, with the edition and the address read, are in LEAGUE_SOURCES (ijf-sor, ijf-sor-2020, ajjf-guide, wkf-kumite, wkf-kata, fik-regulations, jsa-dohyo, jsa-quiz, wikipedia-dohyo, znkr-unei, wakayama-kyudo-2015, tatami-sizes, kodokan-facilities, budokan-overview, butokuden-ja, wikipedia-halls), all read on 2026-10-14.

Ours. The colours of every look (the IJF names two colours only; the blue, the grey, the green and beige, the black and the red-and-green looks are for events and rooms that choose others), of the clay, the sand, the straw and the floors. The karate mat's size (1 m by 1 m) and the width of the boundary band as drawn. The kendo shiai-jo's size by default (10 m, the middle of the range), the boards of its floor and the dashed outer boundary. The dohyō's height drawn (55 cm), the width of a tawara (20 cm), how far a tokudawara stands out (20 cm), the jano-me's width (50 cm) and which edge of the circle the 4.55 m is (the inside); the tassels' places. The yamichi's and the arrows' path's widths, the azuchi's size, the roofs' outlines and the shajō's rear (1.5 m beyond the officials' row). The technical table's size and distance, the judges' seats, the referee's disc. The look of a dojo's walls, doors, windows and shrine, and the 3 m of its walls in 3D. The shape of the Kodokan's main dojo (24 by 35 mats' widths of Chūkyōma mats for 420 jō), of its other dojos, and of the floors of the Butokuden (100 jō) and the Budokwai (50 jō), whose sizes were not found; the number of contest areas on the Budokan's floor. The stands' profiles.

Surface units#

SURFACE_UNITS (src/units.ts) is the unit each rulebook states its principal figures in. The drawing is made in feet and a figure is one conversion from the rulebook's own.

Soccer#

Every figure of src/surfaces/soccer-spec.ts is in metres, as the Laws give it (with yards beside). Each page was read on 2026-10-13.

Ours. The Laws do not give these; each is drawn as a reasonable reading.

• The goal's net: 2 m deep (1 m in futsal, 1.2 m on a small-sided pitch) and drawn from above with its posts as dots; the crossbar's height is not drawn.
• The marks' sizes: penalty and centre marks are drawn as discs larger than a painted mark (22 cm across), corner flags as a small triangle, and the lines thicker than painted unless exactLines is set.
• The marks off the field: read as 9.15 m from the arc's edge, so 10.15 m from the corner point (the arc's radius added); they are drawn 40 cm long. Futsal's, 5 m from the arc, are read the same way.
• 9-a-side: the FA's table gives the pitch and the goal, and no text found on any FA page gives the 9v9 penalty area or circle. A box 11 m deep, the goal's width and 11 m either side, a mark at 9 m and a circle of 7.3 m are ours.
• 5- and 7-a-side: the pitches are the FA's mini-soccer sizes, the markings those of its small-sided laws; the two documents are different games, and which a league uses is its own.
• NWSL: no official figure was found, so there is no preset.
• Mown stripes and colours: style, not dimensions. Nineteen bands (odd, so that both ends are alike) cut a 105 m pitch into 5.5 m, the depth of the goal area.

Soccer coordinate frames#

src/surfaces/soccer-providers.ts registers each provider as a frame. Where a provider's own page gives a figure it is that; where it does not (Opta's, Tracab's and Second Spectrum's specifications are not public), the figure is what the open-source libraries mplsoccer (MIT), ggsoccer (MIT), kloppy and floodlight agree on, which is said in each frame's source. No code of any of them is used.

Ours.

• Opta's goal. Three libraries give three goal widths (9.6, 11.6 and a post at 44.62). The frame uses 9.6 (45.2 to 54.8, mplsoccer and kloppy); a feed settles it.
• Wyscout's posts (6 either side) are ggsoccer's, which says its figures came from Wyscout's customer support; the glossary does not mark them.
• The centre circle is not a landmark: it is round, 9.15 m, at any pitch size.
• A fixed frame on another pitch. Opta's, StatsBomb's and Wyscout's figures are fractions of their own extents, so on a 100 by 64 m pitch a drawn penalty line lies at 17 per cent of 100 m. A frame whose numbers follow the pitch (Tracab, SkillCorner, Second Spectrum, Metrica, international) has the Laws' landmarks at the size it is given.
• The directions of Tracab's and Second Spectrum's y (up, from the centre) are the libraries'; check one known point against your data.

Soccer grounds#

The facts of the 64 grounds of scripts/grounds.data.json (listed in grounds.md) are read from the English Wikipedia article of each ground at the revision named in NOTICE.md, and its name in Japanese from the Japanese article. They are facts (a length, a year, a name); no text, table or picture of an article is used. Each was read on 2026-10-13.

Ours.

• A size the article does not give is not guessed. A ground whose infobox has no football figure (or only that of another sport: the Rose Bowl's American football field, Stadium Australia's oval) is drawn at the international 105 by 68 m and marked pitchSize: "default".
• A figure that cannot be a pitch for international matches is not used. The infoboxes of the Stade de France (119 by 75 m) and of Kashima Soccer Stadium (115 by 78 m) give a size outside the 100 to 110 by 64 to 75 m of Law 1.4, and both held World Cup matches; each is listed at the default with the figure in its pitchNote. The build refuses a published size outside that range.
• Where two names share a year, the later name wins, and an entry further down the list overrides one above it. The infobox's years that meet (Pro Player Stadium (1996-2005), Dolphins Stadium (2005-2006)) are kept as they are; the order resolves them.
• The 1950 World Cup had a final round and no final; the ground is listed for 1950 without a final.
• The Parc des Princes article's infobox dates the first stadium on the site (1897, pulled down in 1967); the present stadium is Paris Saint-Germain's home from 1974. It is listed with no opening year, at the default size, for 1938 and 1998.
• Capacity is the first figure of the infobox, which for a stadium of two sports is the first sport's. A capacity the infobox leaves to a template (Hampden Park, Celtic Park) or gives as a range (Wankdorf) is left out.
• Names in the place's language are the infobox's native name where it gives one, else the local Wikipedia's title (Wikidata's native label where the two agree).

Special games#

The 18 games of EVENTS (special-games.md) are read from the English Wikipedia article of each game and of its venue, at the revision named in NOTICE.md, and from three articles of the press for where a rink stood. They are facts (a day, a venue, a length); no text, table or picture is used. Each was read on 2026-10-13. A game's own surface is the one drawn alone, from the sources of its own section (the NHL rink and the NBA's and NCAA's courts, the CFL's and the NCAA's fields, a ballpark's fence); what is here is the rest.

Ours.

• Where no source says where the surface stood, a convention places it, and the game says so. midfield is the middle of the host's field with the surface's length along it; deck the same on a deck; infield the middle of a ballpark's infield (63.64 feet from home plate, the point where the line from first base to third crosses the line from home plate to second) with the rink's length from first base to third, the direction the Wrigley Field rink of 2009 had; diamond the middle of a baseball field's infield on the middle of a pitch, home plate to center field along it. No offset or angle is made up beyond those: a test holds each game's numbers to the rule it names.
• Wrigley Field, 2009. The two numbers 112 and 288 add to the 400 feet to the center-field wall, so 112 is read as the rink's edge toward the wall, the one reading under which the rink also covers the pitching mound, as "splits the pitchers' mound from first to third" says. That puts its middle 69.5 feet out, 9 feet from the mound that NHL.com's Dan Craig names. The sources differ by that much, and by what was planned before: the diagram had center ice at second base before the rink was moved into the infield.
• Fenway Park, 2023. "Roughly centered" is read as the middle halfway between first and third, and "a second-to-third-base axis" as the rink's length turned 45 degrees from third base toward second. The article says the 2023 layout differs from the 2010 one and does not describe the 2010 one, so 2010 is by convention.
• The deck is the bounding rectangle of the class's overall length and beam; the ship's own flight deck is angled and narrower at its ends.
• London's five fence distances are the five of the fence option. The article's two points where the temporary fences join the wall are drawn at the usual angle of left center and right center, and the 330 feet to the poles in 2023 is that of 2019, which the article does not restate.
• A football stadium's field is the CFL's, or the NCAA's at Notre Dame Stadium, whose field is the stadium's tenant's; BC Place's roof was closed for its game, and the drawing says so.
• What was looked for and not found: a source for where the rink stood in each of the other ballparks, in the football stadiums, and for the court on the carrier's deck; the exact figures of the 2024 London fence; and the placement of the football fields at Wrigley Field, of which only directions are published (see special-games.md).

Heights in the 3D view#

The 3D view stands things up on a surface; where each stands is the drawing's own (the court's, the plan's and the figures' places above), and how high is below. Every figure was read from the rulebook named, on 2026-10-13 (the rule numbers are those of the edition named; the page or PDF is given for each). A strip is drawn at least a thousandth of the surface's diagonal thick and a mesh at least a cell of that size, so a 3-inch post on a 500-foot ground stays in sight: those sizes are ours. What a rule leaves open is said as ours.

Coordinate frames#

src/frames.providers.ts holds the frames of the providers below, as landmarks on the drawing's own coordinates (feet; x along the surface from its left end, y across it from the top, a ballpark's x across and y minus out from home plate). Only facts were read: ranges, units, origins and conventions. No code of sportypy, sportyR or hockey_rink (all GPL) was read for them; the MIT projects sdv-plot, sporty and mplsoccer are credited in references.md for ideas. Each page below was read on 2026-10-13.

Ours. Where the sources read do not settle a convention, the frame carries the common one and says so in its note:

• The NHL API's y. The ranges and the centre-ice origin are read; the sign of y is not. Positive y is taken as the left of a team attacking right, drawn upward, as in the feet frame of the HockeyTech pull request. A shot at a known side of a known game settles it.
• NFL tracking's origin. The schema gives ranges and units, and refers to a figure for the origin. It is taken as the bottom left corner of the field diagram with y up. A play from a known side settles it.
• MLBAM's scale. 2.5 feet a unit is the common reading of a pixel frame that is not a survey (one analysis found 2.48 and warns that a ball near a foul line can fall on the wrong side); the extent of the image (0 to 250) is approximate.
• NBA's LOC_X sign (negative at the shooter's left) is one source's finding from the names of the zones; the shooter's left is drawn at the top of a surface drawn wide with the team attacking right.
• The Retrosheet zone centres. The diagram has no coordinates. The outfield zone centres use the depth of each ring (238, 290, 330 and 380 feet for S, none, D and XD) and the angle of each column (0, 16, 31 and 40.5 degrees either side of dead centre) measured off the picture; the infield and foul zones are read at their place on it. They are good to a few feet and are symmetrical by construction, which a test holds; the diagram is a drawing for scorers and not a survey.
• Which end is attacked in a period. Hockey changes ends every period, overtime included (Wikipedia, "Overtime (sports)", as a search result gave it); basketball changes baskets for the second half and an overtime period keeps those ends (NBA rulebook, Rule 5, as a search result gave it); football changes goals after the first and third quarters (the NFL rule as generally stated: the rulebook page was not read here and a search found nothing on it). A period no rule here settles is left to the caller.

Surfaces through the years#

year draws a surface as the rules marked it in a season (rulesFor, src/eras.ts). The changes are data, each with the season it began in, a sentence in English and in Japanese, and the sources that say so; eraChanges(sport) lists them and the README's table sums them up. Only facts were read: a figure, a season and what changed. No text, table or picture of a source is copied. Wikipedia (CC BY-SA 4.0) is cited by revision so that a figure can be checked. Every page below was read on 2026-10-13.

How a year maps to a season. A season is named by the year it starts in, so 1979 is the 1979-80 season of the NHL and the NBA; the NFL, the CFL and baseball play in one calendar year, and 1974 is the 1974 season. A change "from 1979" is in force for 1979 and every later season until another change. The data were last checked in the 2026 season (ERA_CURRENT), which is what a drawing without a year shows; a change announced for a later season is planned and is drawn only when that season is asked for.

Ours, and where the sources disagree.

• A marking no source covers keeps the nearest cited state. The NHL's goal lines are cited from 1997 (11 feet) and the blue lines from 1998 (73 feet), so an earlier season draws them there and rulesFor(...).gaps names them. A gap is never listed among a season's differences. What was looked for and not found is in references.md.
• The size of the bases. 15 inches square before 2023 and 18 from 2023 (the Official Baseball Rules, Rule 2.03; MLB's announcement of 9 September 2022). CBS Sports calls the 15 inches the size "for well over a century"; no source read dates an earlier size or says when 15 inches began, so every season before 2023 is drawn at 15 and the change is the only dated one. Wikipedia's "Base (baseball)" gives no history of the size. The bases are drawn larger than life unless exactLines is set, in both sizes.
• An approximate state. The baseball pitcher's box is cited at 45 feet (the 1870s) and 50 feet (from 1881) but its size only from 1887 (4 by 5½ feet); the earlier boxes are drawn at the 1887 size and approx says so.
• The mound is drawn with the plate. The sources give a raised mound but not the year it came; from 1893 the pitcher's plate is set on it, so the dirt circle of the mound is drawn from 1893 and not before. The mound's height (15 inches from 1903 to 1968, 10 from 1969) is data only: a top view does not show it. The article also says "from 1893 to 1950" in another sentence; 1903 is the date it gives with the figure.
• The home plate is drawn from the shapes and places the article dates (round 1857 to 1867, a square 1868 to 1870, turned 1871 to 1899, the pentagon from 1900; centred on the foul lines' meeting 1861 to 1874, wholly behind it 1875 and 1876, in front of it from 1877). The dates are those of the National Association and the National League, which the article names; no other league's is claimed. The batter's boxes of 1885 are the National League's (the American Association followed in 1886).
• The NFL's goal posts. The slingshot is dated 1967 (Sports Illustrated: "up until 1967" they were an H); a search result said Wikipedia's article on the goal post has the shape "first seen in 1966", an article that was not read here. The NFL's hash marks before 1933 are none: a game of the 1932 playoffs used them once, and they were adopted for 1933. The one-yard sideline ticks, which the drawing keeps in every season, are not dated by any source read.
• The NHL's hash marks (hashApart) are cited at 3 feet from 2012-13 and 5 feet 7 inches from 2014-15, from the NHL's own rulebook and its joint release with the NHLPA; CBS Sports says the same. Nothing earlier than the 2012-13 book was read, so earlier seasons keep the nearest cited state and gaps names hashApart.
• The CFL's hash marks are cited at 24 yards for the 2015 edition of the rulebook and by Wikipedia's "formerly"; an earlier season draws them there too, and gaps says so. The 2027 field's middle is drawn as a 50, not a C: no source says how it will be marked.
• The 2005-06 NHL package is dated from NHL Records' "Historical Rule Changes", whose page is script-rendered and was not read directly: a search result's summary of it is what was read, together with the AHL's own release of the package the NHL adopted. The 2004-05 AHL season ran the goal lines at 11 feet already; the NHL's first season with them is 2005-06.

The rules engine and the targets#

What zoneAt and the targets add to the figures above (src/rules.ts, src/target.ts). The geometry is the package's own figures; what is ours is said here.

Zone sets#

The named zones that zones layers count into (src/heat.zones.ts). Each zone is a shape on the surface in the drawing's frame and a test of whether a point lies in it; the zones of a set do not overlap. Where a source names the zones and not their edges, the edges are ours, built on the surface's own markings (the figures above), and are said so here. The tests hold each definition to the points and the lines given below.

The colour ramps are Kyogijo's own: nine stops each, chosen by luminance and checked by a test against the surface colours and the ground a heat layer paints (see data layers); no palette of a plotting package is copied.

Formations#

The named formations of src/formations.ts and src/formations.sports.ts. A formation is a convention: coaches draw each one a little differently, no rulebook fixes where a player stands, and the numbers here are ours, an example of each shape in the frame of its sport (the table in Team shape says which). What a source settles is the sport's surface, the frame, and in a few places a rule.

League variants#

league (src/leagues/) draws a surface as one league's rulebook marks it. Every figure is the rulebook's, in its own unit (LEAGUES[sport][i].unit); LEAGUE_SOURCES names each document with its edition and the address it was read at on 2026-10-13, and docs/variants.md lists the figures of every league with its sources. Arcs are measured as the rule measures them (to the outside edge of the line unless said), and lines are drawn thicker than painted unless exactLines is set, as everywhere in this package. No text, table or drawing of a rulebook is copied. Figures marked "diagram" are labels read off the rulebook's own diagram. sporty (MIT) was checked against after the figures were read; where ours differ, and why, is below.

Basketball#

Dated history, drawn with year. The WNBA's lane was 12 feet and became 16 for 2004 (Seattle Times, 18 December 2003, a news report; the WNBA's own page was not readable). The NCAA's restricted-area arc: none, 3 feet in Division I men's and women's games from 2011-12 (NCAA News, 26 May 2011), 4 feet for the men from 2015-16 (NCAA.com, 15 May 2015) and for the women from 2017-18 (the women's playing rules history), and no required arc for the women from 2023-24.

Dated, not drawn (the earlier figure's other half is not in the sources, so a drawing would be made up): the NCAA men's three-point line, introduced in 1986-87 at 19 ft 9 in, moved to 20 ft 9 in in 2008-09 and 22 ft 1¾ in in 2019-20; the women's, 19 ft 9 in from 1987-88, 20 ft 9 in from 2011-12, 22 ft 1¾ in from 2021-22; the WNBA's, 20 ft 6¼ in from 2004 and 22 ft 1¾ in from 2013; FIBA's, 6.25 m until the rules of 1 October 2010 and 6.75 m after, with the trapezoid lane made a rectangle; the NFHS's, 19 ft 9 in from 1987-88. The corner distance of each earlier line was not found, and an arc shorter than the corner distance cannot be drawn.

Ours. The WNBA's basket and backboard distances (5 ft 3 in and 4 feet) are the NBA's: the WNBA diagram labels only the 15 inches from the board to the ring's centre. The small marks of the WNBA and NCAA courts are placed as the NBA's (7, 11, 14 and 17 feet from the baseline, from the diagram's 3, 1, 3, 3 and 3 feet) and the lower defensive box is the NBA's and the WNBA's alone. The NFHS backboard is drawn 6 feet wide (the rules allow 6 by 4, 6 by 3½ and a 54-inch fan). The NCAA arc of 4 feet is drawn at the figure the rule gives (to the inside edge). Where sporty differs. Its NCAA women's line is the 20 ft 9 in of before 2021-22; its FIBA no-charge arc is 1.25 m (the 2010 figure to the inner edge; the 2026 book gives 1.30 m to the outer edge, the same line); it has no small marks drawn for the NFHS court.

Hockey#

Dated history, drawn with year. The IIHF's blue lines were 22.86 m (75 feet) from the end boards in the 2018-22 book and are 22.50 m in the 2022/23 diagram; the goalkeepers' restricted area came with the unified rule book of 2021/22 (IIHF news, 25 June 2021). The AHL moved its blue lines 4 feet towards centre ice for 2005-06 (so they stood at 71 feet); the NCAA men's trapezoid is from 2026-27.

Ours. The IIHF rules give a range for the width and the corner radius; the largest is drawn. The IIHF net's depth (1 m) is ours: Rule 2 gives none. The USHL's corner radius is the NHL's: the rule says only "uniformly rounded". The 2022/23 blue line is read from a diagram that does not say which edge of the line is meant, and the 2018-22 distance "includes full line widths". The NHL's hash marks are 5 ft 7 in apart (Rule 1.9), and the AHL, ECHL, OHL, WHL and PWHL read the same words in their Rule 1, as does the NCAA; the QMJHL prints 5 feet and the USHL's source 4. Where the sources disagree. The NHL's Rule 1.8 and the diagram give a trapezoid 8 feet from each post (22 feet at the goal line), and Rule 27.8 says 6 feet (18 feet), in the 2024-25, 2025-26 and 2026-27 books alike (see Hockey above); the package draws 22. The ECHL's blue-line sentence reads "sixty feet (64')": the numeral is taken. Where sporty differs. Its IIHF rink is 60 by 30 m with a 4.5 m circle and 8.5 m corners as here; it draws the IIHF blue lines at the NHL's 15 m neutral zone (ours: 22.50 m from the boards, the same 15 m); its NCAA corner radius is 20 feet as here.

Football#

Ours. The goal posts of every league added here are drawn as a slingshot, the common modern shape; the rules read give their width and place, not their shape. The numbers are drawn 6 feet tall for every league, as the NCAA and NFHS give them ("should be"). The NFHS states a restraining line and nine-yard marks, which are not drawn. The IFL's hash marks: the book names two sets, a wide one (30 feet apart) and a narrow one (10), and the wide is drawn. Where sporty agrees and differs. Its hash-mark distances, number places and field sizes for the NCAA and the NFHS 11-, 9-, 8- and 6-player fields are the same as these (its NFHS 9-player hash 7.78 yd apart is 23 ft 4 in). It has no Texas six-man or indoor field.

Baseball and softball#

Ours. Where the rules give a range of fence distances the least is drawn, and where they give only the lines and the middle the fence is a curve through those points and no others. The infield's dirt arc is drawn at the rule's radius where it gives one (95 feet for the Little League Intermediate field, the NCAA and the NFHS; 60 and 70 feet for softball) and at 5 feet more than the bases elsewhere. Little League Majors' plate (18 by 4 inches) and home plate, and the 15-inch bases of Little League, PONY and the NFHS softball, are the figures of a secondary copy of its rule book or inferred (the rule text is in a phone app only). The pitching distance of PONY is from the plate's front edge, as for the other leagues: the book does not say. A softball pitcher's circle is drawn with the mound's dirt. The home plate, the 24 by 6 inch pitcher's plate and the running lane are as the Official Baseball Rules for every league that does not say otherwise. Where sporty differs. Its Little League has the plate 47 feet from home (46 to the middle of a 5-foot mound) and a 50-foot infield arc (the layouts label no such arc for the Majors), boxes of 3 by 7 feet (6 by 3 in the one copy of the rule found); its NCAA and NFHS baseball fences are 355 and 400 feet (the rules above give 330, 375 and 400, and at least 300 and 350); its PONY fence 265 and 315 (7-D gives 275 and 315).

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