New version chess engine: Velvet 5.3.0 NNUE

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Velvet - UCI Chess Engine
Author: Martin Hornet, 
Rating CEDR (Chess Engines Diary Rating)=3450

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.5.3.0
This releases comes with a new neural network, search improvements and some small fixes
Estimated strength increase: ~ 25 Elo

Changes
New neural network trained from v5.2.0 training set + re-scored training sets from earlier Velvet versions
Updated training tools
Some minor search improvements and fixes
Some optimizations
Statistics
Elo change: v5.3.0 compared to v5.2.0 against the same set of opponents

Installation
The chess engine is available for Windows and Linux and requires a 64 Bit CPU.
There are optimized executables available for different CPU micro-architecture generations.

Starting with Velvet v4.1.0 there are also builds for macOS provided.
Currently there are no specific optimizations for the ARM-based/Apple Silicon builds implemented, so
the macOS builds for x86_64 might be faster.

If you have a relatively modern CPU (2013+) with AVX2 support, then the ...-x86_64-avx2 executable is highly recommended for best performance.

Individual statistics: Velvet 5.2.0 - 274 games (+ 96,=114,- 64), 55.8  %
Critter 1.6a                  :  12 (+  9,=  3,-  0), 87.5 %
Zahak 10.0                    :   2 (+  1,=  1,-  0), 75.0 %
Tucano 10.00                  :   4 (+  2,=  2,-  0), 75.0 %
Slowchess 2.9                 :   6 (+  1,=  4,-  1), 50.0 %
Journeyman 2.1                :   2 (+  2,=  0,-  0), 100.0 %
Fisherov chess monk 1.2       :   2 (+  0,=  0,-  2),  0.0 %
FoxSEE 8.2                    :   4 (+  4,=  0,-  0), 100.0 %
Seer 2.6                      :   6 (+  0,=  2,-  4), 16.7 %
Fornax 4.0                    :   2 (+  2,=  0,-  0), 100.0 %
Stockfish 15.1                :   4 (+  0,=  2,-  2), 25.0 %
Minic 3.33                    :   6 (+  0,=  6,-  0), 50.0 %
Uralochka 3.39d               :   6 (+  0,=  3,-  3), 25.0 %
Igel 3.4.0                    :   6 (+  0,=  3,-  3), 25.0 %
Koivisto 9.2                  :   6 (+  0,=  3,-  3), 25.0 %
Rebel 16.2                    :  10 (+  0,=  8,-  2), 40.0 %
Berserk 11.1                  :   6 (+  0,=  4,-  2), 33.3 %
BlackCore 6.0                 :   6 (+  1,=  5,-  0), 58.3 %
Booot 7.1                     :   6 (+  0,=  6,-  0), 50.0 %
Wasp 6.50                     :   8 (+  2,=  4,-  2), 50.0 %
Clovis III                    :   2 (+  2,=  0,-  0), 100.0 %
Pawn 1.0                      :   2 (+  2,=  0,-  0), 100.0 %
Arasan 23.5                   :   6 (+  0,=  5,-  1), 41.7 %
Knightx 3.7b                  :   2 (+  2,=  0,-  0), 100.0 %
Altair 2.0.0                  :   2 (+  2,=  0,-  0), 100.0 %
Jangine 2023-03-31            :   2 (+  2,=  0,-  0), 100.0 %
MrBob 1.2.0                   :   2 (+  0,=  2,-  0), 50.0 %
RubiChess 20230410            :   2 (+  0,=  1,-  1), 25.0 %
RubiChess 20230407            :   6 (+  0,=  3,-  3), 25.0 %
Caissa 1.8                    :   8 (+  1,=  5,-  2), 43.8 %
Queen 4.05                    :   2 (+  2,=  0,-  0), 100.0 %
Stockfish dev-20230503 Ivec   :   4 (+  0,=  0,-  4),  0.0 %
Polaris 1.6.1                 :   8 (+  7,=  1,-  0), 93.8 %
Viridithas 9.0.0              :  14 (+  2,=  9,-  3), 46.4 %
Midnight 6                    :   2 (+  2,=  0,-  0), 100.0 %
CatroPOLY 1.8 20230506        :   2 (+  0,=  1,-  1), 25.0 %
Vafra 12.4 Cfish              :   6 (+  0,=  3,-  3), 25.0 %
ShashChess GZ                 :   4 (+  0,=  2,-  2), 25.0 %
4ku 3.0                       :   2 (+  1,=  1,-  0), 75.0 %
Ice4 v3                       :   2 (+  2,=  0,-  0), 100.0 %
Kuma 1.1                      :   2 (+  1,=  0,-  1), 50.0 %
Apotheosis 4.0.1              :   2 (+  1,=  1,-  0), 75.0 %
Fire 5032023                  :   2 (+  0,=  1,-  1), 25.0 %
Eubos 2.20                    :   2 (+  2,=  0,-  0), 100.0 %
Ippolit 051323                :   8 (+  6,=  2,-  0), 87.5 %
Willow 2.8                    :   8 (+  8,=  0,-  0), 100.0 %
TheBaron 3.45                 :  10 (+ 10,=  0,-  0), 100.0 %
Clover 4.1                    :  12 (+  1,=  5,-  6), 29.2 %
Akimbo 0.3.0                  :   4 (+  4,=  0,-  0), 100.0 %
Eubos 2.21                    :   2 (+  2,=  0,-  0), 100.0 %
Fire 5192023                  :   6 (+  1,=  4,-  1), 50.0 %
QuintBot 1.2.0                :   2 (+  2,=  0,-  0), 100.0 %
StoneChess 2023-05-20         :   2 (+  2,=  0,-  0), 100.0 %
Fire-zero 5192023             :   2 (+  0,=  2,-  0), 50.0 %
NIppolit                      :   2 (+  1,=  1,-  0), 75.0 %
Fire NN 5162023               :   4 (+  1,=  3,-  0), 62.5 %
ShashChess 32                 :   2 (+  0,=  0,-  2),  0.0 %
Brainlearn 24                 :   2 (+  0,=  1,-  1), 25.0 %
Polyfish 230510               :   6 (+  0,=  3,-  3), 25.0 %
Little Beast 2 sl             :   2 (+  0,=  1,-  1), 25.0 %
Drofa 3.3.27                  :   4 (+  3,=  1,-  0), 87.5 %
Raid v1                       :   4 (+  0,=  0,-  4),  0.0 %


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