It may involve changes to the board, pieces, or rules to express an idea or theme impossible in orthodox chess.
The term fairy chess was introduced by Henry Tate in 1914.
Although the term fairy chess is sometimes used for games, it is more usually applied in the context of problems.
Types of changed rules in fairy chess problems include: There are fairy chess problems that combine some of these changed rules.
[clarification needed] All entries in the world championships and in the FIDE Albums are divided into eight sections: directmates (2-movers, 3-movers and more-movers), endgame studies, helpmates, selfmates, fairy chess, retros, and mathematical problems.