RUSSIAN_DRAUGHTS_RULESconstant

Russian draughts (shashki), from the Russian Draughts Federation's rules (ФШР, shashki.ru) and the FMJD/IDF rules for 8×8 draughts: men take both ways, kings fly, any capture may be chosen whatever it takes (FMJD-64 4.13), and a man that reaches the far row in the middle of a capture is crowned there and carries on capturing as a king (4.14).

Draws, as the federation writes them: a third repetition with the same side to move; three kings or more that have not taken a lone king by their fifteenth move, counted from when that balance arose; and any ending in which both sides have a king and nothing is taken or crowned for five moves (two or three pieces on the board), thirty (four or five) or sixty (six or seven). Fifteen moves of kings alone is rules/noProgress.ts.

NOT APPLIED: the five-move count for three pieces against a lone king on the main road, for the reason given at INTERNATIONAL_DRAUGHTS_RULES; the "clearly drawn position", which is an arbiter's judgement and not a count; and the three-kings rule's "or kings and men", which the federation's own text leaves unclear. It is read as kings alone, the narrower reading, so it never draws a game it might not apply to.

import { RUSSIAN_DRAUGHTS_RULES } from "@johnmorrisdotca/narabe";

const RUSSIAN_DRAUGHTS_RULES: CheckersRules = {
    menRows: 3,
    menCaptureBackward: true,
    flyingKings: true,
    captureChoice: CAPTURE_CHOICES.free,
    crownMidCapture: CROWN_MID_CAPTURE.continues,
    repetitionDraw: 3,
    endgameCounts: [
        {
            kind: ENDGAME_COUNT_KINDS.endings,
            restartsOnChange: true,
            endings: Array.from({ length: 10 }, (_, extra) => [{ kings: 3 + extra, men: 0 }, LONE_KING] as const),
            movesEach: 15,
        },
        { kind: ENDGAME_COUNT_KINDS.balance, pieces: [2, 3], movesEach: 5 },
        { kind: ENDGAME_COUNT_KINDS.balance, pieces: [4, 5], movesEach: 30 },
        { kind: ENDGAME_COUNT_KINDS.balance, pieces: [6, 7], movesEach: 60 },
    ],
}

import { RUSSIAN_DRAUGHTS_RULES } from "@johnmorrisdotca/narabe";
console.log(RUSSIAN_DRAUGHTS_RULES);

{
  menRows: 3,
  menCaptureBackward: true,
  flyingKings: true,
  captureChoice: 'free',
  crownMidCapture: 'continues',
  repetitionDraw: 3,
  endgameCounts: [
    {
      kind: 'endings',
      restartsOnChange: true,
      endings: [Array],
      movesEach: 15
    },
    { kind: 'balance', pieces: [Array], movesEach: 5 },
    { kind: 'balance', pieces: [Array], movesEach: 30 },
    { kind: 'balance', pieces: [Array], movesEach: 60 }
  ]
}