Velvet - UCI Chess Engine
Author: Martin Hornet,
Rating CEDR (Chess Engines Diary Rating)=3471
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
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.6.0.0
This releases comes with a new neural network architecture and some small search improvements 🎄
Estimated strength increase: ~ 35 Elo
Notes:
The strength increase in FRC/DFRC is much lower (< 10 Elo)
Generating more DFRC training positions for the bigger neural network is planned for a future v6.1.0 release
Changes
Change neural network architecture from 3x5x768->2x512->1 to 32x768->2x512->1
New neural network trained from v5.3.0 (and v6.0.0 dev) self-play games
Updated training tools to support training of bigger networks
Some refactorings and optimizations
Statistics
Elo change: v6.0.0 compared to v5.3.0 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.)
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.
Velvet - Rating CEDR progres
Pl | Engine | Rating | Score | Games | % |
774 | Velvet 5.2.1 | 3471.0 | 101.50 | 264 | 38.45 |
784 | Velvet 5.3.0 | 3457.2 | 363.00 | 769 | 47.20 |
786 | Velvet 5.2.0 | 3453.4 | 250.50 | 490 | 51.12 |
840 | Velvet 4.0.1 | 3377.7 | 143.50 | 264 | 54.36 |
849 | Velvet 5.0.0 | 3367.3 | 231.50 | 679 | 34.09 |
869 | Velvet 4.1.0 | 3340.7 | 272.50 | 723 | 37.69 |
878 | Velvet 4.0.0 | 3331.6 | 68.00 | 139 | 48.92 |
919 | Velvet 5.1.0 | 3283.6 | 125.50 | 337 | 37.24 |
924 | Velvet 3.3.0 | 3272.7 | 53.00 | 106 | 50.00 |
Does NOT work on older PC's.
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