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Chess engine: Greko 2021.05

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Greko - UCI chess engine, Author: Vladimir Medvedev 
Rating JCER=2648

GreKo 2021.05 (15-May-2021):
Numerous changes in search and evaluation.
Main differences with 2020.03:
- Refactored and simplified code for search. Use the same function for all node types.
- More parameters for evaluation weights. Use tabulated values instead of quadratic approximations.
- Optimization in hash key calculation. Pawn hash key now is a part of main hash key.
- Use simpler time management algorithm.
- Use stochastic gradient descent as a single training method, instead of mix with coordinate descent before.
- Trained from pure material weights in 1.6 M positions from self-play games, fixed depth = 5.
Estimated playing strength is +20...+50 Elo points over 2020.03, depending on time settings.
The slower time control the stronger.


Greko 2021.05 - download

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