Jisho

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変則
Wikipedia definition
1. Chess variantA chess variant is a game related to, derived from or inspired by chess. The difference from chess might include one or more of the following: different board (larger or smaller, non-square board shape overall or different intra-board cell shapes such as triangles or hexagons); addition, substitution or removal of pieces in standard chess (non-standard pieces are known as fairy pieces); different rules for capture, move order, game objective, etc.
Read “Chess variant” on English Wikipedia
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Read “Chess variant” on DBpedia

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