Cwtch - A chess engine written in C.
Author: Colin Jenkins
Cwtch 6 what's new?
Cwtch 6 changes mostly drag Cwtch's search into the 21st century. Probably around +50 Elo over Cwtch 5.
A new (768*2) -> 512 -> 1 sqrrelu net built from 2B contemporary self-gen positions.
Allow a uci, go sequence to keep Graham happy :)
1 ply continuation history.
Capture history.
Improving heuristic and add to beta pruning.
Singular extensions.
Basic correction history.
Use the _v3 binaries unless your computer is very old.
Cwtch v5 vs other engines:
| Critter 1.6a | 12/20 | +4 | 20 games |
| Vajolet2 3.1.0 | 9.5/17 | +2 | 17 games |
| Fizbo 2 JA | 8.5/14 | +3 | 14 games |
| Monolith 3 | 7.5/14 | +1 | 14 games |
| Illumina 3.0 JA | 4/8 | +0 | 8 games |
| Sturddle 2.5.0 | 4.5/7 | +2 | 7 games |
| Zangdar 6.1.1 | 1/6 | -4 | 6 games |
| Ynode 0234 | 1/6 | -4 | 6 games |
| Chess-3 4.0 | 3.5/4 | +3 | 4 games |
| Reckless 0.10.0 dev-6abcff05 | 1.5/4 | -1 | 4 games |
| Integral 7.0.0 JA | 0.5/4 | -3 | 4 games |
| Alexander 8.3 | 0.5/4 | -3 | 4 games |
| YuliGM 2026 | 0.5/4 | -3 | 4 games |
| YuliGM Pro Apex | 0.5/4 | -3 | 4 games |
| Caissa 1.25 | 0.5/4 | -3 | 4 games |
| Caissa 1.25 JA | 0/4 | -4 | 4 games |
| SF-PRO2 30.03.2026 | 0/4 | -4 | 4 games |
| Lambergar 1.3 | 1.5/3 | +0 | 3 games |
| Akira CE 1.4.4 | 2/2 | +2 | 2 games |
| Lux 5.0 | 2/2 | +2 | 2 games |
| Cheng4 0.48 | 1.5/2 | +1 | 2 games |
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