Koivisto

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Hjalmar Munsterhjelm - Koivikko ja ruispelto [1]

Koivisto,
an UCI compliant open source chess engine by Kim Kåhre and Finn Eggers, at times supported by Eugenio Bruno, 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. Koivisto 5.0 in July 2021 replaced the perceptron approach of a real-men-evaluation (RME) by an own NNUE [2] [3].

Features

Board Representation

Search

Evaluation

Misc

Forum Posts

Re: New engine releases 2020 by Finn Eggers, CCC, September 03, 2020
Re: Koivisto by Finn Eggers, CCC, September 04, 2020

External Links

Chess Engine

Misc

koivikko - Wiktionary

References

  1. Hjalmar Munsterhjelm - Koivikko ja ruispelto (Birch and rye field), 1876, Finnish National Gallery, Wikimedia Commons
  2. Re: Koivisto by Finn Eggers, CCC, September 04, 2020
  3. Koivisto 5.0 by Finn Eggers, CCC, July 07, 2021
  4. Dot products using _mm_mul_ps, _mm_add_ps

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