Chess engine: Reckless 0.8.0 dev.4b8cfde JA

 

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 0.7.0 vs other engines:

Xiphos 0.6.1 JA	7.5/12	+3	12 Games
Toga IV 1.1 JA	7.5/12	+3	12 Games
Lifish 1.0	6.5/12	+1	12 Games
Counter 5.5	6/12	+0	12 Games
Weiss 2.1 JA	5.5/12	-1	12 Games
Smallbrain 7.0 JA	5.5/8	+3	8 Games
Avalanche 2.1.0	5.5/8	+3	8 Games
Sirius 8.0	5/8	+2	8 Games
Gogobello 3.0	5/8	+2	8 Games
BlackCore 6.0	4.5/8	+1	8 Games
StockDory Starfish 0.1	4.5/8	+1	8 Games
Stash 35.26 JA	4/8	+0	8 Games
Carp 3.0.1	2.5/8	-3	8 Games
Sloth 2.0	6/6	+6	6 Games
Kobol 1.1	6/6	+6	6 Games
Bgrassy dev.5f18d51 JA	6/6	+6	6 Games
Zangdar 2.30	5/6	+4	6 Games
Quanticade Aurora 0.8	4.5/6	+3	6 Games
Molybdenum 4.0	4/6	+2	6 Games
Quanticade 0.8 JA	3/6	+0	6 Games
Stockfish 20240820 Ivec	1/6	-4	6 Games

Jim Ablett compiles:

Reckless 0.8.0 dev.4b8cfde JA download