Chess960 is a chess variant in which the positions of the pieces are decided by lot. The point of Chess960 is to stress understanding and calculation, not memorization. Use this tag along with the tag [chess-variants].

Chess960 is a chess variant invented by world chess champion Robert J. Fischer. Originally called Fischer Random chess, it was renamed for marketing purposes to Chess960. The number '960' comes from the 960 possible starting positions. Chess960 is also known in United States chess as Chess 9LX.

The first world championship officially sanctioned by FIDE, the FIDE World Fischer Random Chess Championship 2019, brought additional prominence to this variant. The winner was Wesley So, who defeated world chess champion Magnus Carlsen, by 4 wins and 0 losses, to become the inaugural World Fischer Random Chess Champion.