​Chess is a two-player strategy board game played on a chessboard, a checkered gameboard with 64 squares arranged in an eight-by-eight grid. It is one of the world's most popular games.

Chess960 is a variant of chess invented and advocated by former World Chess Champion Bobby Fischer. It employs the same board and pieces as standard chess; however, the starting position of the pieces on the players' home ranks is randomized. The random setup renders the prospect of obtaining an advantage through the memorization of opening lines impracticable, compelling players to rely on their talent and creativity.

In Chess960, each player may castle once per game, the same as standard chess, moving both the king and a rook in a single move; however, the castling rules were reinterpreted in Chess960 to support the different possible initial positions of the king and rook. After castling, the king and rook final positions are exactly the same as they are in standard chess.

Interesting is the possibility doing castling in the first movement at an appropriate set  figures.