![]() Fairy chess variantsįor chess variants with fairy pieces (e.g., shatranj, makruk, sittuyin, etc.), playing strength is above all other known multi-variant engines (e.g., Sjaak II, FairyMax, Nebiyu) and at least on par with the best (non-Stockfish) engines in the respective variant, except for Shogi and Xiangqi, see below. Strong NNUE networks are available for all lichess variants and surpass all other engines. Lichess variantsįor the variants supported by lichess and multi-variant Stockfish (Crazyhouse, antichess, 3check, etc.), playing strength without NNUE is on par (+-200 Elo) with multi-variant Stockfish, and above other variant engines. Actually, NNUE evaluation even is faster than classical, which is why Fairy-Stockfish uses pure NNUE instead of hybrid evaluation. ![]() When using NNUE the speed difference is lower than with classical evaluation, since the variant code has much less impact on NNUE than on classical evaluation. Chessįor standard chess, functionality is almost identical with official Stockfish, but the slowdown (>2x) due to overhead for fairy pieces and variants leads to >100 Elo weaker performance. Even in user-defined variants the engine has never encountered before Fairy-Stockfish usually plays at master level without any adaptations. When using NNUE evaluation Fairy-Stockfish plays at a superhuman level in all major regional chess variants, such as Xiangqi, Shogi, Janggi, and Makruk. For most of the popular variants NNUE networks are available that can further improve playing strength, see the list of NNUE networks. Fairy-Stockfish outperforms most chess variant engines, except for variants where many highly specialized engines exist (e.g., Shogi), and is the strongest engine in a large variety of variants such as Janggi, Sittuyin, Capablanca chess, etc.
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