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Chess engine: Polyfish 20220507 (based on Stockfish)

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Polyfish is a UCI chess engine based on Stockfish.
It is identical to Stockfish with the added capability of handling Polyglot,

Polyfish supports two polyglot BIN books at the same time. The second book is only probed if the first book has no moves for the given position. The engine starts searching only if no move is found in either the first book or the second book.

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