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BrainFish - UCI chess engine JCER Rating=3378 Information from the author: Brainfish is a standard Stockfish chess engine extended by a general book format that is capable of handling a reduced part of Cerebellum, which is an innovative chess opening and playing book. In Brainfish, the book moves are only used in engine games, not in analysis mode. All moves in the published book Cerebellum_light.bin generated by Cerebellum were calculated by using Stockfish as analysis engine, without using statistics. Then those moves where recalulated by the Cerebellum Library using a graph algorithm that makes all scores in the library consistant. Consistant scores means for example, in case the starting position has a score of 0.2 and a best move is 1.e4, the position after 1.e4 must have the score -0.2. Additionally, some others properties are found, like the best main line of a position and possible Transitions. Hence, when Brainfish is playing moves that are in the Cerebellum book, it plays like Stockfish regarding the evaluation, only at a much higher skill level. Pondering is only active after the last move out of the book has been played. The lines in Cerebellum_light.bin are in some cases reaching the late middlegame and endgame. BrainFish is licensed unter the GPL, which includes the access code to the general book format. Cerebellum Light 171212 - download BrainFish 171212 - download
Stockfish, chess engine UCI Rating JCER = 3389 🔬 Author: Alain SAVARD Timestamp: 1513002464 Simplify other checks #1334 Simplify the other check penalty computation. Compared to current master, a) it uses a 143 kingDanger penalty instead of S(10, 10) for the "otherCheck" (credits to ElbertoOne for finding a suitable kingDanger range to replace the score and to Guardian for showing this could also be a neutral change at LTC). This makes our king safety model more consistent and simpler. b) it might also score more than one "otherCheck" penalty for a given piece type instead of just one c) it might score many pinned penalties instead of just one. d) It also remove 3 conditionals and uses simpler expressions. So it was tested as a SPRT[-3, 1] Passed STC LLR: 2.96 (-2.94,2.94) [-3.00,1.00] Total: 11705 W: 2217 L: 2080 D: 7408 And LTC LLR: 2.94 (-2.94,2.94) [-3.00,1.00] Total: 26812 W: 3575 L: 3463 D: 19774 Trying to improve on b) another attempt was made to score also the "otherchecks" for piece types which had some safe checks, but this failed STC bench: 5149133 ⭐⭐⭐ Stockfish 17121115 - download