This is the first release of Cheers, providing a reasonable strength on a single thread
Rating CEDR=2485 Author: Algorhythm
v.0.3.0:
This version features a ground-up rebuild of the evaluation function for a significant strength improvement over version 0.2.2
STC:
ELO | 206.78 +- 10.22 (95%)
CONF | 8.0+0.08s Threads=1 Hash=8MB
GAMES | N: 5000 W: 3446 L: 778 D: 776
LTC:
ELO | 241.04 +- 10.46 (95%)
CONF | 60.0+0.60s Threads=1 Hash=64MB
GAMES | N: 5000 W: 3568 L: 566 D: 866
These self-play results are likely inflated, and comparing Cheers 0.3.0 to other engines will result in smaller Elo gains over 0.2.2.
Evaluation data
On top of creating a stronger evaluation function with the existing dataset, the open lichess-big3-resolved dataset was incorporated for another large strength increase.
Bugfixes
This release fixes a long-standing 'bug' in the reporting of castling moves in regular chess vs. chess960. cutechess-cli, a de-facto standard of sorts, will accept 960-style castling (king takes friendly rook) regardless of the UCI_Chess960 setting, but other programs will crash if regular castling (king moves 2 squares) is not used. #2
This release properly respects the UCI_Chess960 setting and will report castling correspondingly. As to what the 'correct' behaviour should be, it is underspecified in the UCI documentation.
Rating CEDR progres - Cheers.
| Pl | Engine | Rating | Score | Games | % |
| 1256 | Cheers 0.1 | 2485.2 | 31.00 | 100 | 31.00 |
| 1380 | Cheers 0.2.2 | 2289.9 | 18.50 | 100 | 18.50 |
| 1442 | Cheers 0.2 | 2161.4 | 2.50 | 32 | 7.81 |
| 1472 | Cheers 0.2.1 | 2081.8 | 1.50 | 33 | 4.55 |
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