A shuffled back rank to counter strong opening knowledge. Aka Fischer Random Chess.
Chess 960 derives its name from the 960 possible unqiue starting positions. The the home ranks are randomized, within some limitations, which makes it distinct from standard shuffle chess.
Invented by world chess champion Bobby Fischer in effort to improve the game by breaking the dependency of experienced players on opening theory.
Pawns are placed normal, but the home rank is set up in 1 of 960 possible variations within the following rules.
White and black home ranks pieces are set up identically, including the King and Queen facing each other on the same file.
The moves of the pieces remains the same as Standard Chess.
Pawn promotion rules remains the same as Standard Chess.
The randomised home rank necessitates change in the standard castling rules. All remain the same as Standard Chess, with the exception of the starting positions and squares travelled during the castling move.
Rather than moving two squares along the home rank, the King must move to either side of the Rook regardless of how many squares are vacant between them.
When the King and Rook are adjacent to each other the King must be placed onto the Rook to initiate the castling.
Unlike Standard Chess, it is possible to Castle on the very move in this variant!
En passant rules remains the same as Standard Chess.
Check and Checkmate rules remain the same as Standard Chess.
Stalemate conditions remain the same as Standard Chess.
Draw conditions remain the same as Standard Chess.
Winning conditions remain the same as Standard Chess.