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knights.js
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knights.js
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/**
* For each cell of a chess board, represent all the valid move targets for a knight on that cell.
* The reverse also applies; for each cell it gives you all cells from which a knight may reach that cell.
* The K represents the position of the knight for visual QoL only. It'll end up as a zero in the bitboard.
* The ones represent valid move targets for a knight, notwithstanding actual board state rules.
* @type {BigInt[]}
*/
export const knightMoves = [
`
00000000
00000000
00000000
00000000
00000000
00000010
00000100
0000000N
`,
`
00000000
00000000
00000000
00000000
00000000
00000101
00001000
000000N0
`,
`
00000000
00000000
00000000
00000000
00000000
00001010
00010001
00000N00
`,
`
00000000
00000000
00000000
00000000
00000000
00010100
00100010
0000N000
`,
`
00000000
00000000
00000000
00000000
00000000
00101000
01000100
000N0000
`,
`
00000000
00000000
00000000
00000000
00000000
01010000
10001000
00N00000
`,
`
00000000
00000000
00000000
00000000
00000000
10100000
00010000
0N000000
`,
`
00000000
00000000
00000000
00000000
00000000
01000000
00100000
N0000000
`,
`
00000000
00000000
00000000
00000000
00000010
00000100
0000000N
00000100
`,
`
00000000
00000000
00000000
00000000
00000101
00001000
000000N0
00001000
`,
`
00000000
00000000
00000000
00000000
00001010
00010001
00000N00
00010001
`,
`
00000000
00000000
00000000
00000000
00010100
00100010
0000N000
00100010
`,
`
00000000
00000000
00000000
00000000
00101000
01000100
000N0000
01000100
`,
`
00000000
00000000
00000000
00000000
01010000
10001000
00N00000
10001000
`,
`
00000000
00000000
00000000
00000000
10100000
00010000
0N000000
00010000
`,
`
00000000
00000000
00000000
00000000
01000000
00100000
N0000000
00100000
`,
`
00000000
00000000
00000000
00000010
00000100
0000000N
00000100
00000010
`,
`
00000000
00000000
00000000
00000101
00001000
000000N0
00001000
00000101
`,
`
00000000
00000000
00000000
00001010
00010001
00000N00
00010001
00001010
`,
`
00000000
00000000
00000000
00010100
00100010
0000N000
00100010
00010100
`,
`
00000000
00000000
00000000
00101000
01000100
000N0000
01000100
00101000
`,
`
00000000
00000000
00000000
01010000
10001000
00N00000
10001000
01010000
`,
`
00000000
00000000
00000000
10100000
00010000
0N000000
00010000
10100000
`,
`
00000000
00000000
00000000
01000000
00100000
N0000000
00100000
01000000
`,
`
00000000
00000000
00000010
00000100
0000000N
00000100
00000010
00000000
`,
`
00000000
00000000
00000101
00001000
000000N0
00001000
00000101
00000000
`,
`
00000000
00000000
00001010
00010001
00000N00
00010001
00001010
00000000
`,
`
00000000
00000000
00010100
00100010
0000N000
00100010
00010100
00000000
`,
`
00000000
00000000
00101000
01000100
000N0000
01000100
00101000
00000000
`,
`
00000000
00000000
01010000
10001000
00N00000
10001000
01010000
00000000
`,
`
00000000
00000000
10100000
00010000
0N000000
00010000
10100000
00000000
`,
`
00000000
00000000
01000000
00100000
N0000000
00100000
01000000
00000000
`,
`
00000000
00000010
00000100
0000000N
00000100
00000010
00000000
00000000
`,
`
00000000
00000101
00001000
000000N0
00001000
00000101
00000000
00000000
`,
`
00000000
00001010
00010001
00000N00
00010001
00001010
00000000
00000000
`,
`
00000000
00010100
00100010
0000N000
00100010
00010100
00000000
00000000
`,
`
00000000
00101000
01000100
000N0000
01000100
00101000
00000000
00000000
`,
`
00000000
01010000
10001000
00N00000
10001000
01010000
00000000
00000000
`,
`
00000000
10100000
00010000
0N000000
00010000
10100000
00000000
00000000
`,
`
00000000
01000000
00100000
N0000000
00100000
01000000
00000000
00000000
`,
`
00000010
00000100
0000000N
00000100
00000010
00000000
00000000
00000000
`,
`
00000101
00001000
000000N0
00001000
00000101
00000000
00000000
00000000
`,
`
00001010
00010001
00000N00
00010001
00001010
00000000
00000000
00000000
`,
`
00010100
00100010
0000N000
00100010
00010100
00000000
00000000
00000000
`,
`
00101000
01000100
000N0000
01000100
00101000
00000000
00000000
00000000
`,
`
01010000
10001000
00N00000
10001000
01010000
00000000
00000000
00000000
`,
`
10100000
00010000
0N000000
00010000
10100000
00000000
00000000
00000000
`,
`
01000000
00100000
N0000000
00100000
01000000
00000000
00000000
00000000
`,
`
00000100
0000000N
00000100
00000010
00000000
00000000
00000000
00000000
`,
`
00001000
000000N0
00001000
00000101
00000000
00000000
00000000
00000000
`,
`
00010001
00000N00
00010001
00001010
00000000
00000000
00000000
00000000
`,
`
00100010
0000N000
00100010
00010100
00000000
00000000
00000000
00000000
`,
`
01000100
000N0000
01000100
00101000
00000000
00000000
00000000
00000000
`,
`
10001000
00N00000
10001000
01010000
00000000
00000000
00000000
00000000
`,
`
00010000
0N000000
00010000
10100000
00000000
00000000
00000000
00000000
`,
`
00100000
N0000000
00100000
01000000
00000000
00000000
00000000
00000000
`,
`
0000000N
00000100
00000010
00000000
00000000
00000000
00000000
00000000
`,
`
000000N0
00001000
00000101
00000000
00000000
00000000
00000000
00000000
`,
`
00000N00
00010001
00001010
00000000
00000000
00000000
00000000
00000000
`,
`
0000N000
00100010
00010100
00000000
00000000
00000000
00000000
00000000
`,
`
000N0000
01000100
00101000
00000000
00000000
00000000
00000000
00000000
`,
`
00N00000
10001000
01010000
00000000
00000000
00000000
00000000
00000000
`,
`
0N000000
00010000
10100000
00000000
00000000
00000000
00000000
00000000
`,
`
N0000000
00100000
01000000
00000000
00000000
00000000
00000000
00000000
`,
].map(s => BigInt(`0b${s.replace('N', '0').replace(/\s/g, '')}`));
/**
* For each index, representing a cell index, list an array of cell indices where this
* knight could potentially move to from that cell (provided the board state allows it)
*
* Generated through:
* for (let n=0n; n<64n; ++n) {
* knightCellToMoveCells[n] = [];
* for (let i=0n; i<64n; ++i) {
* if (knightMoves[n] & (1n << i)) knightCellToMoveCells[n].push(i);
* }
* }
*
* @type {BigInt[][]}
*/
export const knightCellToMoveCells = [
[ 10n, 17n ],
[ 11n, 16n, 18n ],
[ 8n, 12n, 17n, 19n ],
[ 9n, 13n, 18n, 20n ],
[ 10n, 14n, 19n, 21n ],
[ 11n, 15n, 20n, 22n ],
[ 12n, 21n, 23n ],
[ 13n, 22n ],
[ 2n, 18n, 25n ],
[ 3n, 19n, 24n, 26n ],
[ 0n, 4n, 16n, 20n, 25n, 27n ],
[ 1n, 5n, 17n, 21n, 26n, 28n ],
[ 2n, 6n, 18n, 22n, 27n, 29n ],
[ 3n, 7n, 19n, 23n, 28n, 30n ],
[ 4n, 20n, 29n, 31n ],
[ 5n, 21n, 30n ],
[ 1n, 10n, 26n, 33n ],
[ 0n, 2n, 11n, 27n, 32n, 34n ],
[ 1n, 3n, 8n, 12n, 24n, 28n, 33n, 35n ],
[ 2n, 4n, 9n, 13n, 25n, 29n, 34n, 36n ],
[ 3n, 5n, 10n, 14n, 26n, 30n, 35n, 37n ],
[ 4n, 6n, 11n, 15n, 27n, 31n, 36n, 38n ],
[ 5n, 7n, 12n, 28n, 37n, 39n ],
[ 6n, 13n, 29n, 38n ],
[ 9n, 18n, 34n, 41n ],
[ 8n, 10n, 19n, 35n, 40n, 42n ],
[ 9n, 11n, 16n, 20n, 32n, 36n, 41n, 43n ],
[ 10n, 12n, 17n, 21n, 33n, 37n, 42n, 44n ],
[ 11n, 13n, 18n, 22n, 34n, 38n, 43n, 45n ],
[ 12n, 14n, 19n, 23n, 35n, 39n, 44n, 46n ],
[ 13n, 15n, 20n, 36n, 45n, 47n ],
[ 14n, 21n, 37n, 46n ],
[ 17n, 26n, 42n, 49n ],
[ 16n, 18n, 27n, 43n, 48n, 50n ],
[ 17n, 19n, 24n, 28n, 40n, 44n, 49n, 51n ],
[ 18n, 20n, 25n, 29n, 41n, 45n, 50n, 52n ],
[ 19n, 21n, 26n, 30n, 42n, 46n, 51n, 53n ],
[ 20n, 22n, 27n, 31n, 43n, 47n, 52n, 54n ],
[ 21n, 23n, 28n, 44n, 53n, 55n ],
[ 22n, 29n, 45n, 54n ],
[ 25n, 34n, 50n, 57n ],
[ 24n, 26n, 35n, 51n, 56n, 58n ],
[ 25n, 27n, 32n, 36n, 48n, 52n, 57n, 59n ],
[ 26n, 28n, 33n, 37n, 49n, 53n, 58n, 60n ],
[ 27n, 29n, 34n, 38n, 50n, 54n, 59n, 61n ],
[ 28n, 30n, 35n, 39n, 51n, 55n, 60n, 62n ],
[ 29n, 31n, 36n, 52n, 61n, 63n ],
[ 30n, 37n, 53n, 62n ],
[ 33n, 42n, 58n ],
[ 32n, 34n, 43n, 59n ],
[ 33n, 35n, 40n, 44n, 56n, 60n ],
[ 34n, 36n, 41n, 45n, 57n, 61n ],
[ 35n, 37n, 42n, 46n, 58n, 62n ],
[ 36n, 38n, 43n, 47n, 59n, 63n ],
[ 37n, 39n, 44n, 60n ],
[ 38n, 45n, 61n ],
[ 41n, 50n ],
[ 40n, 42n, 51n ],
[ 41n, 43n, 48n, 52n ],
[ 42n, 44n, 49n, 53n ],
[ 43n, 45n, 50n, 54n ],
[ 44n, 46n, 51n, 55n ],
[ 45n, 47n, 52n ],
[ 46n, 53n ]
];