chess variants

A chess variant (or unorthodox chess) is a game "related to, derived from or inspired by chess". The difference from chess might include one or more of the following:

• different rules for capture, move order, game objective, etc.;
• addition, substitution or removal of pieces in standard chess (non-standard pieces are known as fairy pieces);
• different chessboard (larger or smaller, non-square board shape overall or different intra-board cell shapes such as hexagons).