Changes

a [[Chess Engine Communication Protocol]], and since version '''1.5''', [[UCI]] compliant <ref>[http://kirill-kryukov.com/chess/discussion-board/viewtopic.php?f=7&t=8241 Fizbo version 1.5 released] by [[Youri Matiounine]], [[Computer Chess Forums|CCRL Discussion Board]], August 16, 2015</ref> chess engine by [[Youri Matiounine]], - in October 2019 [[#Fizbo 2|Fizbo 2]] became [[:Category:Open Source|open source]]. Fizbo was first released in May 2014 <ref>[http://kirill-kryukov.com/chess/discussion-board/viewtopic.php?f=7&t=7523 new engine - Fizbo - could you please test it?] by [[Youri Matiounine]], [[Computer Chess Forums|CCRL Discussion Board]], May 07, 2014</ref>, apparently [[Bitboards|bitboard]] based, requiring [[x86-64]] [[BitScan#bsfbsr|bitscan forward]] <ref>[http://kirill-kryukov.com/chess/discussion-board/viewtopic.php?f=7&t=7523 new engine - Fizbo - could you please test it?] by [[Youri Matiounine]], [[Computer Chess Forums|CCRL Discussion Board]], May 07, 2014</ref> and taking advantage from [[Population Count|population count]] [[x86-64#gpinstructions|instruction]]. Since version '''1.2''', Fizbo performs a [[Parallel Search|parallel search]] based on a version of enhanced [[Parallel Search#PrincipalVariationSplitting|PV splitting algorithm]], only one split-point is active at a time, along with [[Iterative Deepening|iterative deepening]], since '''1.3''' with [[Aspiration Windows|aspiration windows]]. [[Syzygy Bases]] with up to five pieces were used since version '''1.4''' released in May 2015. The [[Transposition Table|transposition table]] with dense 8 byte entries is used also in [[Quiescence Search|quiescence search]] <ref>[https://sites.google.com/site/fizbochessengine/ Fizbo Chess Engine]</ref>.