ShashChess

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ShashChess,
a Stockfish based derivative by Andrea Manzo with the aim to apply the proposals of Alexander Shashin as exposed in his book Best Play: A New Method for Discovering the Strongest Move . First released in July 2018 , subsequent ShashChess versions feature learning by utilizing a persistent hash table, skill levels and handicap modes, NNUE and Monte-Carlo Tree Search .

Personalities

Based on static evaluation score ranges derivered from pawn endgame point value (PawnValueEg = 208), ShashChess classifies the position with five personalities of three former World Chess Champions, Tigran Petrosian for negative scores, José Raúl Capablanca for balanced scores, and Mikhail Tal for positive scores :

if      (eval < -74) personality =  Petosian;
else if (eval < -31) personality =  Petosian | Capablanca;
else if (eval <  31) personality =             Capablanca;
else if (eval <  74) personality =             Capablanca | Tal;
else                 personality =                          Tal; 

These personalities are considered in various search selectivity thresholds, along with multiple dynamic evaluation score adjustments.

Forum Posts

• ShashChess by Andrea Manzo, CCC, July 28, 2018

Re: ShashChess (11.0) by Andrea Manzo, CCC, March 06, 2020

Re: ShashChess (15.0) by Andrea Manzo, CCC, October 03, 2020

Re: ShashChess (17.1) by Andrea Manzo, CCC, June 01, 2021

• ShashChess NNUE 1.0 by Andrea Manzo, FishCooking, July 25, 2020
• Shashchess which executable to use by Andrew Bernasrd, CCC, January 23, 2021

External Links

• GitHub - amchess/ShashChess: A try to implement Alexander Shashin's theory on a Stockfish's derived chess engine
• ShashChess 11.0 64-bit in CCRL 40/15
• ShashChess 15.0 64-bit in CCRL 40/15

References

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