Fizbo

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Fizbo, a Chess Engine Communication Protocol, and since version 1.5, UCI compliant chess engine by Youri Matiounine - in October 2019 Fizbo 2 became open source. Fizbo was first released in May 2014, apparently bitboard based, requiring x86-64 bitscan forward and taking advantage from population count instruction. Since version 1.2, Fizbo performs a parallel search based on a version of enhanced PV splitting algorithm, only one split-point is active at a time, along with iterative deepening, since 1.3 with aspiration windows. Syzygy Bases with up to five pieces were used since version 1.4 released in May 2015. The transposition table with dense 8 byte entries is used also in quiescence search.

=Further Versions=

Fizbo 1.7
Fizbo 1.7, released in March 2016, improved in evaluation due to changed and new features, including pawn pattern, considering all possible combinations of two pawns of the same color, and further supports 6-piece Syzygy Bases.

Fizbo 1.8
Fizbo 1.8 in August 2016 came with a BMI2 executable, improved pondering logic, reworked parallel search logic, and multiple small changes to search and evaluation.

Fizbo 1.9
Fizbo 1.9, released on December 31, 2016, further enhanced considerably due to extensive changes and new features in evaluation.

Fizbo 2
Fizbo 2 was released in December 21, 2017, and is apparently the last version by Youri Matiounine, who stopped working on the engine, and decided to release his source code on GitHub nearly two years later, featuring a two-layer neural network based evaluation with optional AVX2 intrinsics.

=Forum Posts=

2014

 * new engine - Fizbo - could you please test it? by Youri Matiounine, CCRL Discussion Board, May 07, 2014
 * Fizbo 1.1 by Graham Banks, CCC, May 09, 2014
 * new version of Fizbo engine released by Youri Matiounine, CCRL Discussion Board, July 28, 2014
 * Fizbo version 1.3 is released by Youri Matiounine, CCRL Discussion Board, November 11, 2014
 * Fizbo 1.3 released by Graham Banks, CCC, November 12, 2014

2015

 * Fizbo version 1.4 released by Youri Matiounine, CCRL Discussion Board, May 18, 2015
 * Fizbo 1.4 released by Graham Banks, CCC, May 18, 2015
 * Fizbo version 1.5 released by Youri Matiounine, CCRL Discussion Board, August 16, 2015
 * Fizbo version 1.5 released by Graham Banks, CCC, August 16, 2015

2016

 * Fizbo version 1.6 released by Youri Matiounine, CCRL Discussion Board, January 29, 2016
 * Fizbo 1.6 released by Graham Banks, CCC, January 29, 2016
 * Fizbo 1.7 is released by Youri Matiounine, CCC, March 23, 2016
 * Fizbo 1.8 released by Youri Matiounine, CCC, August 26, 2016
 * Fizbo 1.9 released by Youri Matiounine, CCC, December 31, 2016

2017 ...

 * Re: Tapered Eval between 4 phases by Youri Matiounine, CCC, October 16, 2017 » Tapered Eval, AVX
 * Fizbo 2 has been released by Youri Matiounine, CCC, December 21, 2017
 * Fizbo 2 sources just got released by Damir, CCC, October 06, 2019

2020 ...

 * Bug in Fizbo 2 by Kurt Utzinger, CCC, April 26, 2020

=External Links=

Chess Engine

 * GitHub - MoonstoneLight/Fizbo-Chess: Original codes of Fizbo Chess. Thanks to original author Youri Matiounine
 * Fizbo Chess Engine
 * Fizbo in CCRL 40/4
 * Fizbo in CCRL 40/40

Misc

 * fizbo - Wiktionary
 * Fizbo from Wikipedia

=References= Up one Level