);
    }
}
fn genKingAttacks() [@typeInfo(Square).Enum.fields.len]BoardType {
    var ret: [64]BoardType = [_]BoardType{0} ** 64;
    var bb: BitBoard = .{};
    for (std.enums.values(Square)) |square| {
        bb.board = 0;
        bb.set(square);
        ret[@enumToInt(square)] |= bb.board >> 8;
        if (bb.board & Square.fileBits('h') == 0)
            ret[@enumToInt(square)] |= bb.board >> 7;
        if (bb.board & Square.fileBits('a') == 0)
            ret[@enumToInt(square)] |= (bb.board >> 9 | bb.board >> 1);
        ret[@enumToInt(square)] |= bb.board << 8;
        if (bb.board & Square.fileBits('a') == 0)
            ret[@enumToInt(square)] |= bb.board << 7;
        if (bb.board & Square.fileBits('h') == 0)
            ret[@enumToInt(square)] |= (bb.board << 9 | bb.board << 1);
    }
    return ret;
}
test "KingAttacks" {
    const ka = genKingAttacks();
    { // full move
        var bb: BitBoard = .{};
        bb.set(.c5);
        bb.set(.d5);
        bb.set(.e5);
        bb.set(.c3);
        bb.set(.d3);
        bb.set(.e3);
        bb.set(.c4);
        bb.set(.e4);
        try std.testing.expectEqual(
            bb.board,
            ka[@enumToInt(Square.d4)],
        );
    }
    { // sides - 5 moves
        var bb: BitBoard = .{};
        bb.set(.a5);
        bb.set(.a3);
        bb.set(.b5);
        bb.set(.b4);
        bb.set(.b3);
        try std.testing.expectEqual(
            bb.board,
            ka[@enumToInt(Square.a4)],

    { // sides - 5 moves
        var bb: BitBoard = .{};
        bb.set(.c8);
        bb.set(.e8);
        bb.set(.c7);
        bb.set(.d7);
        bb.set(.e7);
        try std.testing.expectEqual(
            bb.board,
            ka[@enumToInt(Square.d8)],
        );
    }
    { // corner - 3 moves
        var bb: BitBoard = .{};
        bb.set(.g1);
        bb.set(.g2);
        bb.set(.h2);
        try std.testing.expectEqual(
            bb.board,
            ka[@enumToInt(Square.h1)],
        );
    }