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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