失败的国际象棋 FEN 创建

Question

我正在创建国际象棋引擎，运行我的 FEN 函数出现问题。代表黑兵的“p”在b数组中变成了24。但只记录了“p”的第一个实例。我已经进行了一些调试，我（认为）它不是 switch 函数，但除此之外我一无所知。我正在使用 p5.js 库创建它，但为了您的方便，实际的 FEN 函数是原版的。 Link 至网络编辑器：https://editor.p5js.org/KoderM/sketches/jVVn2-Wxc

FEN 函数：

function fromFen(fen) {

  const fS = fen.split(" ");

  const toMove = fS[1];
  const castleAbility = fS[2];
  const enpassant = fS[3];
  const halfMoves = fS[4];
  const fullMoves = fS[5];

  let b = [1];

  console.log("Filtered: " + fS[0].split("").filter(f => f !== "/"));

  fS[0].split("").filter(f => f !== "/").forEach(s => {

    const index = b.indexOf(1);

    console.log("S = " + s + ". Index = " + index + ".");

    if (/^\d$/.test(s)) {

      for (let i = 0; i < Number(s); i++) {

        b[index - i] = 12;

      }

      b[index + Number(s)] = 1;

    } else {

      switch (s) {

        case "p":
          b[index] = 24;
          break;
        case "n":
          b[index] = 25;
          break;
        case "b":
          b[index] = 26;
          break;
        case "r":
          b[index] = 27;
          break;
        case "k":
          b[index] = 28;
          break;
        case "q":
          b[index] = 29;
          break;
        case "P":
          b[index] = 14;
          break;
        case "N":
          b[index] = 15;
          break;
        case "B":
          b[index] = 16;
          break;
        case "R":
          b[index] = 17;
          break;
        case "K":
          b[index] = 18;
          break;
        case "Q":
          b[index] = 19;
          break;
        default:
          throw new Error("Invalid Fen: " + s);

      }

      b[index + 1] = 1;

    }

  });

  b.pop();

  let result = [];

  console.log("result: " + b + " length: " + b.length);

  while (b.length > 7) result.push(b.splice(0, 8));

  return {

    board: result,
    turn: toMove,
    castle: castleAbility,
    halfMoves: halfMoves,
    fullMoves: fullMoves

  };

}

const FENTest = fromFen("rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1");

console.log(FENTest.board);

供参考：

Rows = y (v)
Cols = x (>)

board conditions:
2: empty
3: mouseOver
4: pawn
5: knight
6: bishop
7: rook
8: queen
9: king

1: white
2: black

ex: white pawn: 14
ex: black king: 29
ex empty: 12

Answer 1

如评论中所述，尝试将b[index - i] = 12更改为b[index + i] = 12，如下：

function fromFen(fen) {

  const fS = fen.split(" ");

  const toMove = fS[1];
  const castleAbility = fS[2];
  const enpassant = fS[3];
  const halfMoves = fS[4];
  const fullMoves = fS[5];

  let b = [1];

  console.log("Filtered: " + fS[0].split("").filter(f => f !== "/"));

  fS[0].split("").filter(f => f !== "/").forEach(s => {

    const index = b.indexOf(1);

    console.log("S = " + s + ". Index = " + index + ".");

    if (/^\d$/.test(s)) {

      for (let i = 0; i < Number(s); i++) {

        b[index + i] = 12;

      }

      b[index + Number(s)] = 1;

    } else {

      switch (s) {

        case "p":
          b[index] = 24;
          break;
        case "n":
          b[index] = 25;
          break;
        case "b":
          b[index] = 26;
          break;
        case "r":
          b[index] = 27;
          break;
        case "k":
          b[index] = 28;
          break;
        case "q":
          b[index] = 29;
          break;
        case "P":
          b[index] = 14;
          break;
        case "N":
          b[index] = 15;
          break;
        case "B":
          b[index] = 16;
          break;
        case "R":
          b[index] = 17;
          break;
        case "K":
          b[index] = 18;
          break;
        case "Q":
          b[index] = 19;
          break;
        default:
          throw new Error("Invalid Fen: " + s);

      }

      b[index + 1] = 1;

    }

  });

  b.pop();

  let result = [];

  console.log("result: " + b + " length: " + b.length);

  while (b.length > 7) result.push(b.splice(0, 8));

  return {

    board: result,
    turn: toMove,
    castle: castleAbility,
    halfMoves: halfMoves,
    fullMoves: fullMoves

  };

}

const FENTest = fromFen("rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1");

console.log(FENTest.board);

失败的国际象棋 FEN 创建

Failed chess FEN creation

javascript

chess

p5.js

fen