Chessnix 1.3 - new version chess engine

Chessnix - UCI chess engine

Author: Ericlangedijk  github:https://github.com/ericlangedijk/chessnix

We've begun our first tests of this engine. The author estimates its playing strength at around 3000 ELO, but we believe this is 200-300 points too high.

Chessnix 1.3 what's new?

• Stronger: ~3200 ELO.
• Added: Slight center bias in quiet move ordering for shallow depths (experimental).
• Added: Search history pruning, history reduction.
• Added: Store raw static evaluation in TT.
• Added: Slight capture history bonus and malus in quiescence search.
• Removed: Killer moves.
• Removed: Maintaining pins of both sides. I will not code a 'perfect' SEE in the near future.
• Removed: Unused see_score function.
• Changed: Lots of tweaks in the search algorithm (history pruning + reduction, different LMR table).
• Changed: Correction history.
• Changed: History structure and calculations, especially continuation history.
• Changed: Rescaled history values.
• Changed: Moved 'ply' from position to search.
• Changed: Included a slight score correction during search using rule50.
• Changed: Bound logic when storing to TT. I think it is correct now.
• Changed: Move generation creates ExtMoves (64 bits) instead of the raw moves (16 bits), avoiding copying stuff.
• Bug solved: Terrible LMR table accessing out of bounds value resulting in god knows what.
• Bug solved: Node clearing (before enter search and on making nullmoves).
• Bug solved: Corrected 'id name' uci output.

Chessnix 1.3 vs other engines:

Grail 1.0.2	6.5/10	+3	10 games
Gyatso 1.0.0	2/2	+2	2 games
Grail 1.0.0	1.5/2	+1	2 games
Caligula 3.0	1.5/2	+1	2 games
Knightx 4.7	1/2	+0	2 games
Critter 1.6a	1/2	+0	2 games
Myrddin 0.94	1/2	+0	2 games
Jackychess 25.12 JA	1/2	+0	2 games
4kc	1/2	+0	2 games
Sturddle 2.4.0	0.5/2	-1	2 games
Grail 1.0.1	0.5/2	-1	2 games
Petrel 3.1 JA	0/2	-2	2 games
Halogen 15.26.0	0/2	-2	2 games
Cinder 0.4.0	0/2	-2	2 games
Reckless 0.9.0 dev-0dd5b9ac	0/2	-2	2 games
Quirky 2.1 JA	0/2	-2	2 games
Prelude 2.1	0/2	-2	2 games
Reckless 0.9.0-dev-c5af2cea	0/2	-2	2 games
Caissa 1.24 JA	0/2	-2	2 games
Tcheran 9.0	0/2	-2	2 games
Prune 3.0.0	0/2	-2	2 games

Chessnix 1.3 download