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Chess engine: Polyfish 20231120

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Polyfish is a UCI chess engine based on Stockfish. Rating CEDR=3744

Overview
**Polyfish** is a UCI chess engine based on [Stockfish](https://github.com/official-stockfish). It is identical to Stockfish with the added capability of handling [Polyglot](https://web.archive.org/web/20191216195456/http://hardy.uhasselt.be/Toga/book_format.html) and [CTG](https://www.chessprogramming.org/CTG) book.

**Polyfish** supports two books at the same time, one could configure two CTG books, two BIN books, or one CTG and one BIN in either order. 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.

Read [Note about CTG books](https://github.com/khalid-a-omar/Polyfish#note-about-ctg-books)
Read [Questions and Answers about Polyfish book support](https://github.com/khalid-a-omar/Polyfish#questions-and-answers)


Rating CEDR progres: Polyfish
Pl Engine Rating Score Games %
41 Polyfish 221009 3744.9 315.00 520 60.58
46 Polyfish 230604 3741.8 59.00 112 52.68
60 Polyfish 231001 3739.5 204.00 331 61.63
96 Polyfish 230115 3735.4 304.00 432 70.37
116 Polyfish 230426 3733.4 236.50 335 70.60
127 Polyfish 20230304 3732.2 284.50 463 61.45
140 Polyfish 20230326 3731.3 132.50 218 60.78
164 Polyfish 230621 3730.3 109.00 175 62.29
171 Polyfish 231008 3729.7 212.50 366 58.06
191 Polyfish 230807 3728.6 335.50 510 65.78
205 Polyfish 230708 3728.0 133.00 235 56.60
208 Polyfish 231022 3727.7 150.00 248 60.48
212 Polyfish 230202 3727.6 223.50 356 62.78
235 Polyfish 230510 3726.2 181.50 310 58.55
240 Polyfish 230607 3726.0 92.50 146 63.36


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