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kings.js
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kings.js
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/**
* For each cell of a chess board, represent all the valid move targets for a king on that cell.
* The K represents the position of the king for visual QoL only. It'll end up as a zero in the bitboard.
* The ones represent valid move targets for a king, notwithstanding actual board state rules.
* @type {BigInt[]}
*/
export const kingMoves = [
`
00000000
00000000
00000000
00000000
00000000
00000000
00000011
0000001K
`,
`
00000000
00000000
00000000
00000000
00000000
00000000
00000111
000001K1
`,
`
00000000
00000000
00000000
00000000
00000000
00000000
00001110
00001K10
`,
`
00000000
00000000
00000000
00000000
00000000
00000000
00011100
0001K100
`,
`
00000000
00000000
00000000
00000000
00000000
00000000
00111000
001K1000
`,
`
00000000
00000000
00000000
00000000
00000000
00000000
01110000
01K10000
`,
`
00000000
00000000
00000000
00000000
00000000
00000000
11100000
1K100000
`,
`
00000000
00000000
00000000
00000000
00000000
00000000
11000000
K1000000
`,
`
00000000
00000000
00000000
00000000
00000000
00000011
0000001K
00000011
`,
`
00000000
00000000
00000000
00000000
00000000
00000111
000001K1
00000111
`,
`
00000000
00000000
00000000
00000000
00000000
00001110
00001K10
00001110
`,
`
00000000
00000000
00000000
00000000
00000000
00011100
0001K100
00011100
`,
`
00000000
00000000
00000000
00000000
00000000
00111000
001K1000
00111000
`,
`
00000000
00000000
00000000
00000000
00000000
01110000
01K10000
01110000
`,
`
00000000
00000000
00000000
00000000
00000000
11100000
1K100000
11100000
`,
`
00000000
00000000
00000000
00000000
00000000
11000000
K1000000
11000000
`,
`
00000000
00000000
00000000
00000000
00000011
0000001K
00000011
00000000
`,
`
00000000
00000000
00000000
00000000
00000111
000001K1
00000111
00000000
`,
`
00000000
00000000
00000000
00000000
00001110
00001K10
00001110
00000000
`,
`
00000000
00000000
00000000
00000000
00011100
0001K100
00011100
00000000
`,
`
00000000
00000000
00000000
00000000
00111000
001K1000
00111000
00000000
`,
`
00000000
00000000
00000000
00000000
01110000
01K10000
01110000
00000000
`,
`
00000000
00000000
00000000
00000000
11100000
1K100000
11100000
00000000
`,
`
00000000
00000000
00000000
00000000
11000000
K1000000
11000000
00000000
`,
`
00000000
00000000
00000000
00000011
0000001K
00000011
00000000
00000000
`,
`
00000000
00000000
00000000
00000111
000001K1
00000111
00000000
00000000
`,
`
00000000
00000000
00000000
00001110
00001K10
00001110
00000000
00000000
`,
`
00000000
00000000
00000000
00011100
0001K100
00011100
00000000
00000000
`,
`
00000000
00000000
00000000
00111000
001K1000
00111000
00000000
00000000
`,
`
00000000
00000000
00000000
01110000
01K10000
01110000
00000000
00000000
`,
`
00000000
00000000
00000000
11100000
1K100000
11100000
00000000
00000000
`,
`
00000000
00000000
00000000
11000000
K1000000
11000000
00000000
00000000
`,
`
00000000
00000000
00000011
0000001K
00000011
00000000
00000000
00000000
`,
`
00000000
00000000
00000111
000001K1
00000111
00000000
00000000
00000000
`,
`
00000000
00000000
00001110
00001K10
00001110
00000000
00000000
00000000
`,
`
00000000
00000000
00011100
0001K100
00011100
00000000
00000000
00000000
`,
`
00000000
00000000
00111000
001K1000
00111000
00000000
00000000
00000000
`,
`
00000000
00000000
01110000
01K10000
01110000
00000000
00000000
00000000
`,
`
00000000
00000000
11100000
1K100000
11100000
00000000
00000000
00000000
`,
`
00000000
00000000
11000000
K1000000
11000000
00000000
00000000
00000000
`,
`
00000000
00000011
0000001K
00000011
00000000
00000000
00000000
00000000
`,
`
00000000
00000111
000001K1
00000111
00000000
00000000
00000000
00000000
`,
`
00000000
00001110
00001K10
00001110
00000000
00000000
00000000
00000000
`,
`
00000000
00011100
0001K100
00011100
00000000
00000000
00000000
00000000
`,
`
00000000
00111000
001K1000
00111000
00000000
00000000
00000000
00000000
`,
`
00000000
01110000
01K10000
01110000
00000000
00000000
00000000
00000000
`,
`
00000000
11100000
1K100000
11100000
00000000
00000000
00000000
00000000
`,
`
00000000
11000000
K1000000
11000000
00000000
00000000
00000000
00000000
`,
`
00000011
0000001K
00000011
00000000
00000000
00000000
00000000
00000000
`,
`
00000111
000001K1
00000111
00000000
00000000
00000000
00000000
00000000
`,
`
00001110
00001K10
00001110
00000000
00000000
00000000
00000000
00000000
`,
`
00011100
0001K100
00011100
00000000
00000000
00000000
00000000
00000000
`,
`
00111000
001K1000
00111000
00000000
00000000
00000000
00000000
00000000
`,
`
01110000
01K10000
01110000
00000000
00000000
00000000
00000000
00000000
`,
`
11100000
1K100000
11100000
00000000
00000000
00000000
00000000
00000000
`,
`
11000000
K1000000
11000000
00000000
00000000
00000000
00000000
00000000
`,
`
0000001K
00000011
00000000
00000000
00000000
00000000
00000000
00000000
`,
`
000001K1
00000111
00000000
00000000
00000000
00000000
00000000
00000000
`,
`
00001K10
00001110
00000000
00000000
00000000
00000000
00000000
00000000
`,
`
0001K100
00011100
00000000
00000000
00000000
00000000
00000000
00000000
`,
`
001K1000
00111000
00000000
00000000
00000000
00000000
00000000
00000000
`,
`
01K10000
01110000
00000000
00000000
00000000
00000000
00000000
00000000
`,
`
1K100000
11100000
00000000
00000000
00000000
00000000
00000000
00000000
`,
`
K1000000
11000000
00000000
00000000
00000000
00000000
00000000
00000000
`,
].map(s => BigInt(`0b${s.replace('K', '0').replace(/\s/g, '')}`));
/**
* For each index, representing a cell index, list an array of cell indices where this
* king could potentially move to from that cell (provided the board state allows it)
*
* Generated through:
* for (let n=0n; n<64n; ++n) {
* kingCellToMoveCells[n] = [];
* for (let i=0n; i<64n; ++i) {
* if (kingMoves[n] & (1n << i)) kingCellToMoveCells[n].push(i);
* }
* }
*
* @type {BigInt[][]}
*/
export const kingCellToMoveCells = [
[ 1n, 8n, 9n ],
[ 0n, 2n, 8n, 9n, 10n ],
[ 1n, 3n, 9n, 10n, 11n ],
[ 2n, 4n, 10n, 11n, 12n ],
[ 3n, 5n, 11n, 12n, 13n ],
[ 4n, 6n, 12n, 13n, 14n ],
[ 5n, 7n, 13n, 14n, 15n ],
[ 6n, 14n, 15n ],
[ 0n, 1n, 9n, 16n, 17n ],
[ 0n, 1n, 2n, 8n, 10n, 16n, 17n, 18n ],
[ 1n, 2n, 3n, 9n, 11n, 17n, 18n, 19n ],
[ 2n, 3n, 4n, 10n, 12n, 18n, 19n, 20n ],
[ 3n, 4n, 5n, 11n, 13n, 19n, 20n, 21n ],
[ 4n, 5n, 6n, 12n, 14n, 20n, 21n, 22n ],
[ 5n, 6n, 7n, 13n, 15n, 21n, 22n, 23n ],
[ 6n, 7n, 14n, 22n, 23n ],
[ 8n, 9n, 17n, 24n, 25n ],
[ 8n, 9n, 10n, 16n, 18n, 24n, 25n, 26n ],
[ 9n, 10n, 11n, 17n, 19n, 25n, 26n, 27n ],
[ 10n, 11n, 12n, 18n, 20n, 26n, 27n, 28n ],
[ 11n, 12n, 13n, 19n, 21n, 27n, 28n, 29n ],
[ 12n, 13n, 14n, 20n, 22n, 28n, 29n, 30n ],
[ 13n, 14n, 15n, 21n, 23n, 29n, 30n, 31n ],
[ 14n, 15n, 22n, 30n, 31n ],
[ 16n, 17n, 25n, 32n, 33n ],
[ 16n, 17n, 18n, 24n, 26n, 32n, 33n, 34n ],
[ 17n, 18n, 19n, 25n, 27n, 33n, 34n, 35n ],
[ 18n, 19n, 20n, 26n, 28n, 34n, 35n, 36n ],
[ 19n, 20n, 21n, 27n, 29n, 35n, 36n, 37n ],
[ 20n, 21n, 22n, 28n, 30n, 36n, 37n, 38n ],
[ 21n, 22n, 23n, 29n, 31n, 37n, 38n, 39n ],
[ 22n, 23n, 30n, 38n, 39n ],
[ 24n, 25n, 33n, 40n, 41n ],
[ 24n, 25n, 26n, 32n, 34n, 40n, 41n, 42n ],
[ 25n, 26n, 27n, 33n, 35n, 41n, 42n, 43n ],
[ 26n, 27n, 28n, 34n, 36n, 42n, 43n, 44n ],
[ 27n, 28n, 29n, 35n, 37n, 43n, 44n, 45n ],
[ 28n, 29n, 30n, 36n, 38n, 44n, 45n, 46n ],
[ 29n, 30n, 31n, 37n, 39n, 45n, 46n, 47n ],
[ 30n, 31n, 38n, 46n, 47n ],
[ 32n, 33n, 41n, 48n, 49n ],
[ 32n, 33n, 34n, 40n, 42n, 48n, 49n, 50n ],
[ 33n, 34n, 35n, 41n, 43n, 49n, 50n, 51n ],
[ 34n, 35n, 36n, 42n, 44n, 50n, 51n, 52n ],
[ 35n, 36n, 37n, 43n, 45n, 51n, 52n, 53n ],
[ 36n, 37n, 38n, 44n, 46n, 52n, 53n, 54n ],
[ 37n, 38n, 39n, 45n, 47n, 53n, 54n, 55n ],
[ 38n, 39n, 46n, 54n, 55n ],
[ 40n, 41n, 49n, 56n, 57n ],
[ 40n, 41n, 42n, 48n, 50n, 56n, 57n, 58n ],
[ 41n, 42n, 43n, 49n, 51n, 57n, 58n, 59n ],
[ 42n, 43n, 44n, 50n, 52n, 58n, 59n, 60n ],
[ 43n, 44n, 45n, 51n, 53n, 59n, 60n, 61n ],
[ 44n, 45n, 46n, 52n, 54n, 60n, 61n, 62n ],
[ 45n, 46n, 47n, 53n, 55n, 61n, 62n, 63n ],
[ 46n, 47n, 54n, 62n, 63n ],
[ 48n, 49n, 57n ],
[ 48n, 49n, 50n, 56n, 58n ],
[ 49n, 50n, 51n, 57n, 59n ],
[ 50n, 51n, 52n, 58n, 60n ],
[ 51n, 52n, 53n, 59n, 61n ],
[ 52n, 53n, 54n, 60n, 62n ],
[ 53n, 54n, 55n, 61n, 63n ],
[ 54n, 55n, 62n ]
];