Chess960

Like the standard game of chess, but the pieces behind the pawns on the white side are arranged at random, with the proviso that bishops must end up on opposite colors, and the king is somewhere between the two rooks. The black pieces are lined up to mirror the white.

This results in 960 different possible positions, hence the name Chess960:

4 possible white bishop locations

× 4 possible black bishop locations

× 6 possible queen locations

× 5 × 4 / 2 = 10 possible knight arrangements