- if (randomness == 0)
- return "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w 0 -";
-
- let pieces = { w: new Array(8), b: new Array(8) };
- for (let c of ["w", "b"]) {
- if (c == 'b' && randomness == 1) {
- pieces['b'] = pieces['w'];
- break;
- }
-
- // Get random squares for every piece, totally freely
- let positions = shuffle(ArrayFun.range(8));
- const composition = ['b', 'b', 'r', 'r', 'n', 'n', 'k', 'q'];
- const rem2 = positions[0] % 2;
- if (rem2 == positions[1] % 2) {
- // Fix bishops (on different colors)
- for (let i=2; i<8; i++) {
- if (positions[i] % 2 != rem2)
- [positions[1], positions[i]] = [positions[i], positions[1]];
- }
- }
- for (let i = 0; i < 8; i++) pieces[c][positions[i]] = composition[i];
- }
- return (
- pieces["b"].join("") +
- "/pppppppp/8/8/8/8/PPPPPPPP/" +
- pieces["w"].join("").toUpperCase() +
- // En-passant allowed, but no flags
- " w 0 -"
- );