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Chess engine: Cheers 0.3.0

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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

Cheers 0.3.0 download

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