I implemented a chessboard with chessboard.js and when position change the FEN string is sending to my node.js server using socket.io
The question is, How i can prevent illegal moves or how i can find FEN is possible in every move situation?
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It is not possible, sending every move to server via socket and check the move validity in time with chess.js library, the solution i found in mind.
Vahid Alimohamadi
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It makes no sense because it involves network delay. Use a FEN library. – ABCD Feb 26 '15 at 06:46
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how can a FEN library compare two sequential fen strings and find validity of new position? – Vahid Alimohamadi Feb 27 '15 at 06:32