Yakka 1.5 - new version chess engine
Yakka - UCI chess engine.
Author: CJDalrymple, Rating Chess Engines Diary CEDR=2894
Yakka is a Chess Engine writen in object pascal (Delphi) that implements the Universal Chess Interface (UCI) protocol.
It is recommended to use a Chess GUI application such as Arena, Banksia GUI Cute Chess.
This project is licenced under the MIT Licence
Future Endevours (TODO)
In no particular order:
- Much experimenting / tweaking
- MultiPV
- Pondering
- Singular Extensions
- Endgame Tablebases
- NNUE
Yakka 1.5 what's new?
22 Jan 2026 release.
Strength gain using larger NNUE net and output buckets.
You can download the precompiled Windows executable: 'Yakka v1.5 x64.exe'
This will run on x86-64 CPU's which support the BMI2 and AVX2 instruction sets.
Yakka 1.3 vs other engines:
| Fire 10 mingw | 1.5/20 | -17 | 20 Games |
| YuliGM Pro 20 | 0/16 | -16 | 16 Games |
| Laser 1.8 beta JA | 2/12 | -8 | 12 Games |
| Critter 1.6a | 1.5/12 | -9 | 12 Games |
| Pawn 4.0.4 JA | 1/12 | -10 | 12 Games |
| PlentyChess 6.0.15 | 0/12 | -12 | 12 Games |
| Rebel Extreme 1.1 | 1/10 | -8 | 10 Games |
| Pawnocchio 1.8.1 | 0.5/10 | -9 | 10 Games |
| Spirit 040825 | 0/10 | -10 | 10 Games |
| Alexander 6.0 | 6/8 | +4 | 8 Games |
| Patricia 5.0 | 2.5/8 | -3 | 8 Games |
| HypnoS ++ 1.03 | 1/8 | -6 | 8 Games |
| Zangdar 5 | 0.5/8 | -7 | 8 Games |
| Wordfish 2.50 dev-210925 | 0.5/8 | -7 | 8 Games |
| Lambergar 1.3 | 0.5/8 | -7 | 8 Games |
| Omega 10 | 0.5/8 | -7 | 8 Games |
| MrBob 1.3.0 JA | 0.5/8 | -7 | 8 Games |
| PlentyChess 6.0.18 | 0.5/8 | -7 | 8 Games |
| Spirit XXL | 0/8 | -8 | 8 Games |
| Stockfish dev-20250906 | 0/8 | -8 | 8 Games |
| ShashChess 39 | 0/8 | -8 | 8 Games |
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