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分析由 Stockfish 19 (stockfish.js) 驱动，采用 GNU GPL v3 授权。棋子样式和音效来自 Lichess；谜题来自 Lichess puzzle database（CC0）。表情符号为 Microsoft Fluent Emoji（MIT）。棋手照片（经裁剪）来自 Wikimedia Commons：Magnus Carlsen © Andreas Kontokanis (CC BY-SA 2.0), Hikaru Nakamura © Andreas Kontokanis (CC BY-SA 2.0), Levy Rozman © ChesscomRU (CC BY 3.0), Alexandra Botez © Optic Gaming (CC BY 3.0)。
棋子样式：Merida © Armando Hernandez Marroquin (GPLv2+), Cburnett © Colin M.L. Burnett (GPLv2+), Maestro © sadsnake1, shading ChessRank.org (CC BY-NC-SA 4.0), Alpha © Eric Bentzen (Freeware), Gioco © sadsnake1 (CC BY-NC-SA 4.0), Kosal © philatype (CC BY 4.0), Tatiana © sadsnake1 (CC BY-NC-SA 4.0), Chessnut © Alexis Luengas (Apache 2.0), Fantasy © Maurizio Monge (MIT), Companion © David L. Brown (Freeware), Spatial © Maurizio Monge (MIT), Pixel © therealqtpi (AGPLv3+), Kiwen Suwi © neverRare (CC BY 4.0)。
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