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============================== My email: jotes@go2.pl



Chess engine: Velvet 1.1.0

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Velvet - UCI Chess Engine
Author: Martin Hornet, Rating JCER=2838

 It is based upon my previous web-based engine Wasabi, which can be played here.
Installation
x86_64-modern - recommended for recent CPUs from 2013 onwards (requires a CPU with support for the BMI1 instruction sets)
x86_64-popcnt - for older 64-Bit CPUs, which support the POPCNT instruction, but not BMI1
x86_64-vintage - for older 64-Bit CPUs, which support neither POPCNT nor BMI1

Changes v.1.1.0
Simplified and improved passed pawn evaluation
Replaced null-move pruning with a null-move reduction approach
Increased (theoretical) maximum search depth
Replaced classical line attack generation with obstruction difference algorithm
Improved and optimized tuning tool
Re-tuned all evaluation parameters with a set of 7 million test positions from self-play games
Bonus for rooks on (half) open files
Improved move sorting
Improved mobility evaluation
Improved king safety evaluation

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