New version chess engine: Velvet 7.1.0 NNUE

Velvet - UCI Chess Engine
Author: Martin Hornet, 

Rating CEDR (Chess Engines Diary Rating)=3575

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

v.7.1.0

This is just a minor release with some bug-fixes, performance improvements and a small strength increase

Estimated strength increase: ~ 20 Elo

Changes

Search improvements

Performance optimizations

Fixed bugs

UCI option handling: support spaces inside the 'value' part

50-move draw rule logic: checkmate at 100th half-move evaluated as draw

Statistics

Elo change: v7.1.0 compared to v7.0.0 against the same set of opponents

Move range: grouped by games won in less than x moves (each game only belongs to one group, so a game that ended in 57 moves would belong to the group "60", but not "80", "100", etc.)

Velvet 7.0.0 - results:

Stormphrax 4.0.0	3/4	+2	4 Games
Willow 4.0	2.5/4	+1	4 Games
Altair 7.0.0	2.5/4	+1	4 Games
Uralochka 3.41 dev1	2/4	+0	4 Games
Berserk 12.1	2/4	+0	4 Games
RofChade 3.1	2/4	+0	4 Games
Pawn 3.0	2/4	+0	4 Games
Lizard 10.2	2/4	+0	4 Games
Ethereal 14.25	2/4	+0	4 Games
Seer 2.8.0	1.5/4	-1	4 Games
Obsidian 10.0	1.5/4	-1	4 Games
Clover 6.1	1.5/4	-1	4 Games
RubiChess 20240112	1.5/4	-1	4 Games
Revenge 3.0	1.5/4	-1	4 Games
Alexandria 6.0	1.5/4	-1	4 Games
Caissa 1.17	1/4	-2	4 Games
Deep HIARCS 15.3	2/2	+2	2 Games
Booot 7.3	1.5/2	+1	2 Games
Clarity 5.1.0	1.5/2	+1	2 Games
Tenax 0.9.5	1.5/2	+1	2 Games
Peacekeeper 2.30	1.5/2	+1	2 Games

Velvet 7.1.0 download