- let positions = ArrayFun.range(8);
-
- // Get random squares for bishops
- let randIndex = 2 * randInt(4);
- let bishop1Pos = positions[randIndex];
- // The second bishop must be on a square of different color
- let randIndex_tmp = 2 * randInt(4) + 1;
- let bishop2Pos = positions[randIndex_tmp];
- // Remove chosen squares
- positions.splice(Math.max(randIndex, randIndex_tmp), 1);
- positions.splice(Math.min(randIndex, randIndex_tmp), 1);
-
- // Get random squares for knights
- randIndex = randInt(6);
- let knight1Pos = positions[randIndex];
- positions.splice(randIndex, 1);
- randIndex = randInt(5);
- let knight2Pos = positions[randIndex];
- positions.splice(randIndex, 1);
-
- // Get random square for queen
- randIndex = randInt(4);
- let queenPos = positions[randIndex];
- positions.splice(randIndex, 1);
-
- // Random square for king (no castle)
- randIndex = randInt(3);
- let kingPos = positions[randIndex];
- positions.splice(randIndex, 1);
-
- // Rooks positions are now fixed
- let rook1Pos = positions[0];
- let rook2Pos = positions[1];
-
- // Finally put the shuffled pieces in the board array
- pieces[c][rook1Pos] = "r";
- pieces[c][knight1Pos] = "n";
- pieces[c][bishop1Pos] = "b";
- pieces[c][queenPos] = "q";
- pieces[c][kingPos] = "k";
- pieces[c][bishop2Pos] = "b";
- pieces[c][knight2Pos] = "n";
- pieces[c][rook2Pos] = "r";
+ // 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]];
+ break;
+ }
+ }
+ }
+ for (let i = 0; i < 8; i++) pieces[c][positions[i]] = composition[i];