Fatalii - UCI chess engine
Author: Patrick Heck, Rating CEDR=2276
v.0.5.0:
Improvements
In this release, an evaluation tuner is added to the engine. All evaluation parameters have been tuned with it using the training positions from the Zurichess dataset quiet-labeled.v7.
Additional evaluation parameters
Pawn structure: passed, isolated, backward and doubled pawns
Mobility
Bishop pair
Search
Improve root move ordering: whenever a new best move is found, it is moved to the front of the move list
Use multiple TT entries for move ordering (if the bucket contains multiple entries with different moves for the given position)
Add aspiration windows
Include non-capturing queen promotions in quiescence search
Add countermove heuristic
Stop search after depth 1 if there is only one legal move (only if the option wtime/btime is used)
Bugfix
Use all/both killer moves (previously, only one move was used)
Match against previous version
Chess960, 2s + 0.02s
Score of Fatalii 0.5.0 vs Fatalii 0.4.0: 309 - 125 - 66 [0.684] 500
... Fatalii 0.5.0 playing White: 154 - 63 - 33 [0.682] 250
... Fatalii 0.5.0 playing Black: 155 - 62 - 33 [0.686] 250
... White vs Black: 216 - 218 - 66 [0.498] 500
Elo difference: 134.1 +/- 30.2, LOS: 100.0 %, DrawRatio: 13.2 %
Rating CEDR progres - Fatalii
| Pl | Engine | Rating | Score | Games | % |
| 1453 | Fatalii 0.2.1 | 2276.6 | 6.50 | 64 | 10.16 |
| 1513 | Fatalii 0.4.0 | 2158.0 | 12.50 | 86 | 14.53 |
| 1516 | Fatalii 0.2.0 | 2152.9 | 3.50 | 74 | 4.73 |
| 1519 | Fatalii 0.3.0 | 2149.4 | 9.00 | 82 | 10.98 |
| 1551 | Fatalii 0.3.1 | 2071.4 | 13.00 | 155 | 8.39 |
| 1712 | Fatalii 0.1.2 | 1412.5 | 0.50 | 26 | 1.92 |
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