Grail 3.0.0 - new version chess engine

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Grail - UCI chess engine
Author: Jørgen Hanssen  Rating CEDR=3454

After working on it for a while, I feel my hobby chess engine is finally ready for v1.0.0. Not cutting edge, but plays a solid game.

Grail uses modern search techniques and evaluates positions using a simple NNUE trained on 500 million positions from self-play.

Development continues in my spare time, and I plan to release updates with several missing features and improvements like threading, tablebase support, and pondering. But don't worry! Grail supports all standard UCI time controls and analysis modes, so it works seamlessly with your favorite GUI for matches and analysis.

Grail - what's new?

Long time no see! I’m happy to release Grail 3.0.0. This version adds support for Chess960 and Android builds along with an improved NNUE, faster/better search, and some bug fixes.

New features

  • Chess960 / Fischer Random: supported through the standard UCI_Chess960 option.
  • Android: a new grail-arm64 binary is included in the Linux package. Thanks to @Arzam18 for helping test the Android builds!

Fixes

  • Sending movestogo 0 no longer hangs the search.
  • Syzygy WDL is only probed when the halfmove clock is 0.
  • Node counting and NPS reporting are now correct.

Misc

  • Added grail bench for benchmarking, PGO, and comparing searches.
  • Added go softnodes to search for that many nodes, but complete the iterative depth.

Important notes

  • Default Hash is now 16 MB instead of 256 MB. So it is important to explicitly set this when comparing earlier versions.
  • Nodes and NPS are not directly comparable with previous versions because of the node-counting fixes.

Elo gain over 2.0.1

STC  (10+0.1):  +53.58 ± 4.24 Elo  (10k games)
LTC  (60+0.6):  +55.48 ± 6.79 Elo (3k games)
VLTC (180+1.8): +52.87 ± 11.36 Elo (1k games)




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