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Chess engine: Vafra 12.2 Cfish 12.2

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Vafra is a free (cloned from Crafty ). Since version 12.2 Vafra is a Cfish clone.
Author: Robert Jurjević   Rating Chess Engines Diary CEDR=3648

Overview
Stockfish is a free, powerful UCI chess engine derived from Glaurung 2.1. Stockfish is not a complete chess program and requires a UCI-compatible graphical user interface (GUI) (e.g. Fritz, Arena, Scid, Cute Chess, eboard, Sigma Chess, Shredder, Chess Partner or XBoard with PolyGlot) in order to be used comfortably. Read the documentation for your GUI of choice for information about how to use Stockfish with it.

The Stockfish engine features two evaluation functions for chess, the classical evaluation based on handcrafted terms, and the NNUE evaluation based on efficiently updateable neural networks. The classical evaluation runs efficiently on almost all CPU architectures, while the NNUE evaluation benefits from the vector intrinsics available on most CPUs (sse2, avx2, neon, or similar).

This repository is committed to Vafra Stockfish, an NNUE (Neural Network Easy Update) version of Stockfish derived from Stockfish 12. While subsequent versions of Stockfish integrate an advanced NNUE architecture with enhanced training capabilities, Vafra Stockfish distinguishes itself by maintaining a simplified NNUE architecture and exclusively utilizing zero-knowledge Leela data for training. Guided by Robert Jurjevic's leadership, this project carries forward the legacy of Stockfish developers by exploring alternative approaches to advancing the Stockfish project. We invite you to discover the capabilities of the Vafra Stockfish chess engine.

Vafra 12.2 Cfish results:
OpponentScore+-Games
Fisherov chess monk 1.23.5/11-411 Games
Caissa 1.44.5/8+18 Games
Revenge 3.04/8+08 Games
AI 27.03/7-17 Games
Fire-zero 10720225.5/6+56 Games
Critter 1.6a5/6+46 Games
RubiChess 202212034/6+26 Games
Koivisto 8.172.5/6-16 Games
BrainLearn 21.12/6-26 Games
Blue Marlin 15.62/6-26 Games
Kayra 1.72/6-26 Games
Eman 8.402.5/5+05 Games
YuliGM PrO 4.01.5/5-25 Games
Weiss 2.14/4+44 Games
Viridithas 5.1.04/4+44 Games
Rebel 163/4+24 Games
ShashChess 262/4+04 Games
Berserk 202211292/4+04 Games
Stockfish 202211232/4+04 Games
Stockfish 202301142/4+04 Games
Eman 8.602/4+04 Games

Vafra 12.2 Cfish - Tournament Achievements
TournamentScoreIncrement
Fritz 15 New Engines Tournament 202219.5/26+13
Fritz17 Strong Chess Engines Tournament 202217/36-2
CEDR Top Engines Tournament,  202232.5/52+13
Fritz 17 New Engines Test 202322/30+14
Big Computer event Engines 202325.5/46+5
Fritz 17 Tournament 20229/14+4


Vafra 12.2 - Cfish 12.2 3b00202b826f NNUE - download



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