Koivisto
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Koivisto,
an UCI compliant open source chess engine by Finn Eggers et al., written in C++,
and first released on GitHub in September 2020 under the GPL v3.0.
The bitboard engine provides automated evaluation tuning by logistic regression,
either using stochastic gradient descent or AdaGrad.
However, it seems, the current perceptron approach of the evaluation may soon be replaced by a three layer neural network [2].
Features
Board Representation
Search
Evaluation
- Tapered Eval
- Piece-Square Tables of floats
- Mobility
- Tactical Patterns
- Evaluation Patterns
- Pawn Structure
- King Safety
- Float SSE Dot products [3]
- Automated Tuning by Logistic Regression
Misc
- Syzygy Bases via Fathom
Forum Posts
- Re: New engine releases 2020 by Finn Eggers, CCC, September 02, 2020
- Re: New engine releases 2020 by Finn Eggers, CCC, September 03, 2020
External Links
Chess Engine
Misc
References
- ↑ Hjalmar Munsterhjelm - Koivikko ja ruispelto (Birch and rye field), 1876, Finnish National Gallery, Wikimedia Commons
- ↑ History for src_files/nn - Luecx/Koivisto · GitHub
- ↑ Dot products using _mm_mul_ps, _mm_add_ps