New chess engine: Sirius 7.0

Sirius - UCI chess engine

Rating Chess Engines Diary CEDR=3113

v.7.0:

##Release notes

This version of Sirius is, unfortunately, no longer using just piece square tables for the evaluation function. It is, however, significantly stronger than Sirius 6.0 in self-play. Major new features include a more sophisticated handcrafted evaluation function tuned with my tuner, and a few major search features

Changelog

A few minor refactors

Many new evaluation features

Mobility

Threats

Pawn structure

Passed pawns, isolated pawns, etc.

King safety

Pawn shield/storm

Safe checks from enemy pieces

Attacks to squares near kings

Rooks on open/semi-open files

Knight outposts

Bishop pair

Tempo bonus

A few search changes

Static evaluation correction history

Capture history

Quiescence search futility pruning

Threat history

Some other tweaks

Complete LTC SPSA tune of the entire search

Self-play against Sirius v6.0

Elo   | 269.79 +- 7.38 (95%)

Conf  | 8.0+0.08s Threads=1 Hash=16MB

Games | N: 10000 W: 7189 L: 682 D: 2129

Penta | [29, 163, 708, 1472, 2628]

Elo   | 306.84 +- 10.27 (95%)

Conf  | 40.0+0.40s Threads=1 Hash=64MB

Games | N: 5000 W: 3715 L: 175 D: 1110

Penta | [0, 41, 251, 835, 1373]

Estimated 3200 rating

Sirius 6.0 - results:

Peripheral 1.1.3	12/12	+12	12 Games
Expositor 4WR02	1.5/8	-5	8 Games
Puffin 3.0	5/5	+5	5 Games
Cadie 1.7	2.5/4	+1	4 Games
Obsidian 11.0	0/4	-4	4 Games
Velvet 7.1.0	0/4	-4	4 Games
Inanis 1.2.1	3/3	+3	3 Games
Molybdenum 3.0	2/3	+1	3 Games
Princhess 0.16.0	1.5/3	+0	3 Games
Black Marlin 9.0	0/3	-3	3 Games
ShashChess 34.6	0/3	-3	3 Games
Stockfish 16.1	0/3	-3	3 Games
Devel 4.0.2.3	2/2	+2	2 Games
Lux 4.2	2/2	+2	2 Games
K2 0.99	2/2	+2	2 Games
BabChess 1.0.0	2/2	+2	2 Games
Knightx 3.9	2/2	+2	2 Games
Sloth 1.7	2/2	+2	2 Games
Supernova 2.4	2/2	+2	2 Games
Kobol 1.0	2/2	+2	2 Games
OliThink 5.10.5	2/2	+2	2 Games

Sirius 7.0 download