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New version chess engines: CalvinChess 5.0.1

on


Calvin Chess - java chess engine
Author:Dan Kelsey

v.5.0.1:
This is a bugfix release to address some crashes caused by hitting the max search ply limit (256).

As well as a patch for this bug, this release includes a couple of elo-gaining changes that I stumbled across in the last couple of days.

LTC test vs v5.0.0 indicates a strength gain of around 13 elo:

Score of Calvin DEV vs Calvin: 819 - 669 - 2512  [0.519] 4000
Elo difference: 13.0 +/- 6.6, LOS: 100.0 %, DrawRatio: 62.8 %
🔍 Write to TT in Q-search (#220)
🔍 Stop extending late moves with a good history score (#219)
🐛 Reset ply counter to zero after applying UCI moves (#221)
🐛 In case of engine crash, play random legal move (#222)
How to run
Calvin is available for download as a Java jar file, or as a standalone Windows executable.

To run the jar file, you will need to enable the Vector API package which Calvin uses for SIMD, via this command:

java --add-modules jdk.incubator.vector -jar path/to/calvin-chess-engine-5.0.1.jar



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