Velvet - UCI Chess Engine
Author: Martin Hornet,
Rating CEDR (Chess Engines Diary Rating)=3558
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.7.2.0
This is another minor release with some small search improvements and a bigger neural network
Estimated strength increase: ~ 20 Elo
Changes
Bigger neural network (hidden layer size increased from 2x512 to 2x768 nodes)
Training data for drawn games adjusted to scale down scores for certain material combinations
Search improvements
Time management improvements
Notes
Due to the lack of an ARM-based (Apple Silicon) computer, the new "apple-silicon" builds are untested.
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 7.1.0 - results:
| Obsidian 11.0 | 4.5/15 | -6 | 15 Games |
| Stockfish 16.1 | 4.5/14 | -5 | 14 Games |
| Yuli GM Pro 16 | 4/12 | -4 | 12 Games |
| Yuliirma 4.0 | 2.5/12 | -7 | 12 Games |
| Rebel 16.3 | 4.5/11 | -2 | 11 Games |
| Rice 8.0.0 | 6.5/10 | +3 | 10 Games |
| ShashChess 34.6 | 3.5/10 | -3 | 10 Games |
| Cool Iris 12.10 D3072 | 3.5/9 | -2 | 9 Games |
| SF-PRO 16.03.2024 | 2.5/9 | -4 | 9 Games |
| SF 16.1 MPV | 2/9 | -5 | 9 Games |
| Cool Iris 12.10 | 2/9 | -5 | 9 Games |
| Clover 6.1.19 | 4.5/8 | +1 | 8 Games |
| Tenax 0.9.5 | 4/8 | +0 | 8 Games |
| HypnoS 190324 | 0.5/8 | -7 | 8 Games |
| Viridithas 12.0.0 | 4/7 | +1 | 7 Games |
| Black Marlin 9.0 | 3/7 | -1 | 7 Games |
| JigSaw 5.00 | 1.5/7 | -4 | 7 Games |
| Lifish+HalfKP 1.0 | 4.5/6 | +3 | 6 Games |
| Big-SF 140324 | 2.5/6 | -1 | 6 Games |
| Marauders 3.0 | 1/6 | -4 | 6 Games |
| Fisherov chess monk 1.2 | 1/6 | -4 | 6 Games |
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