voroskoi/pistike - Change XHCMZF25YBLNQLVKKBJJWWJ3G24VFUSLE3LAT2DRWL52RJX4Z3EAC

makeMove: handle castling cases

Created by voroskoi on January 8, 2023

XHCMZF25YBLNQLVKKBJJWWJ3G24VFUSLE3LAT2DRWL52RJX4Z3EAC

Dependencies

In channels

main

Change contents

Replacement in src/Board.zig at line 126 [3.16071]

B:BD[3.19748] → [3.19748:19781]

const Castling = packed struct {

[3.19748]

[3.19781]

const CastligType = u4;
const Castling = packed struct(CastligType) {

Insertion in src/Board.zig at line 132 [3.16071]

[3.19869]


    //                           castling   move     in      in
    //                              right update     binary  decimal
    // king & rooks didn't move:     1111 & 1111  =  1111    15
    //        white king  moved:     1111 & 1100  =  1100    12
    //  white king's rook moved:     1111 & 1110  =  1110    14
    // white queen's rook moved:     1111 & 1101  =  1101    13
    //
    //         black king moved:     1111 & 0011  =  1011    3
    //  black king's rook moved:     1111 & 1011  =  1011    11
    // black queen's rook moved:     1111 & 0111  =  0111    7
    // zig fmt: off
    const CASTLING_RIGHTS: [64]CastligType = .{
         7, 15, 15, 15,  3, 15, 15, 11,
        15, 15, 15, 15, 15, 15, 15, 15,
        15, 15, 15, 15, 15, 15, 15, 15,
        15, 15, 15, 15, 15, 15, 15, 15,
        15, 15, 15, 15, 15, 15, 15, 15,
        15, 15, 15, 15, 15, 15, 15, 15,
        15, 15, 15, 15, 15, 15, 15, 15,
        13, 15, 15, 15, 12, 15, 15, 14
    };
    // zig fmt: on
    fn update(self: *@This(), square: Square) void {
        var ret = @bitCast(CastligType, self.*);
        ret &= CASTLING_RIGHTS[@enumToInt(square)];
        self.* = @bitCast(Castling, ret);
    }

Insertion in src/Board.zig at line 611 [3.16071]

[3.37256]

                        .castling = true,

Insertion in src/Board.zig at line 649 [3.16071]

[3.38609]

                        .castling = true,

Insertion in src/Board.zig at line 767 [3.16071]

[2.4499]


                { // handle castling
                    if (move.castling) {
                        switch (move.target) {
                            .g1 => {
                                self.bitboards[Chess.PE.R.int()].pop(Square.h1);
                                self.bitboards[Chess.PE.R.int()].set(Square.f1);
                            },
                            .c1 => {
                                self.bitboards[Chess.PE.R.int()].pop(Square.a1);
                                self.bitboards[Chess.PE.R.int()].set(Square.d1);
                            },
                            .g8 => {
                                self.bitboards[Chess.PE.r.int()].pop(Square.h8);
                                self.bitboards[Chess.PE.r.int()].set(Square.f8);
                            },
                            .c8 => {
                                self.bitboards[Chess.PE.r.int()].pop(Square.a8);
                                self.bitboards[Chess.PE.r.int()].set(Square.d8);
                            },
                            else => unreachable,
                        }
                    }
                    // update castling rights
                    self.castling.update(move.source);
                    self.castling.update(move.target);
                }