Chess engine: Reckless 0.7.0

 

Introducing Reckless, a Rust-based UCI chess engine.

Author: Arseniy Surkov   Rating Chess Engines Diary CEDR=3360

v.0.7.0:

Release Notes

The NNUE hidden layer size has been increased from 128 to 384, further improved by adding 4 output buckets (#56) and material scaling (#62). The final architecture is (768 -> 384)x2 -> 1x4.

Changelog

Time management

Time adjustment based on score stability (#50)

Time adjustment based on best move stability (#42)

Performance optimizations

Allocate a quiet move list on the stack (#51)

Implement operation fusion for NNUE (#58)

Optimize accumulator handling (#59)

Various search improvements

History tuning (#39)

Null Move Pruning tuning (#54)

Check extensions before the move loop (#40)

Disable quiescence search pruning for recaptures (#35)

Treat non-winning captures as unfavorable in quiescence search (#57)

Static Exchange Evaluation (#36, #37, #44, and #61)

Fully fractional LMR (#60)

Features

Mate Distance Pruning (#43)

Multi-threaded transposition table initialization (#63)

Full Changelog: v0.6.0...v0.7.0

Self-Play Benchmark Against v0.6.0

STC 8.0+0.08s

Elo   | 172.12 +- 11.31 (95%)

Conf  | 8.0+0.08s Threads=1 Hash=32MB

Games | N: 2000 W: 1007 L: 90 D: 903

Penta | [6, 38, 229, 487, 240]

LTC 40.0+0.4s

Elo   | 154.77 +- 13.83 (95%)

Conf  | 40.0+0.40s Threads=1 Hash=128MB

Games | N: 1002 W: 449 L: 30 D: 523

Penta | [0, 16, 136, 263, 86]

Reckless 0.6.0 - results:

Opponent	Score	+-	Games
Lynx 1.4.0	10/10	+10	10 Games
Rice 8.0.0	3/10	-4	10 Games
Jet 1.2	6/9	+3	9 Games
Rebel 16.3	0.5/9	-8	9 Games
Sloth 1.7	8/8	+8	8 Games
Berserk 20240311	2/8	-4	8 Games
Marauders 3.0	0.5/8	-7	8 Games
Stockfish 16.1	0.5/8	-7	8 Games
Piglet 1.3.5	7/7	+7	7 Games
HypnoS 190324	0/7	-7	7 Games
Clover 6.1.19	0.5/6	-5	6 Games
DanaSah 9.1	4.5/5	+4	5 Games
Combusken 2.0.0	3.5/5	+2	5 Games
SF 16.1 MPV	0/5	-5	5 Games
Knightx 3.9	4/4	+4	4 Games
Ippolit 032324	3.5/4	+3	4 Games
Mida 2.3.1	3/4	+2	4 Games
LTChess 9.3	2/4	+0	4 Games
MrBob 1.3.0	1/4	-2	4 Games
Equisetum 1.0	1/4	-2	4 Games
Alexandria 6.1.0	1/4	-2	4 Games

Reckless 0.7.0 download