Caligula 4.0 - new version chess engine

Caligula is a freeware winboard compatible chess engine based in TSCP.
Caligula use by default 256 Mb for hash. You can change hash with command line.

Caligula, a chess program by successor of Toledo 2000. Caligula played a strong 6th Spanish Open Computer Chess Championship 1999 and became Spanish Champion and runner-up behind Chess Tiger, winning from Tiger [2] and Diep, but losing from its countrymen programs Eugen and Ruy Lopez. (source)

Caligula 4.0 what's new?

NN accumulator incremental update, thanks to David Carteau! 

Static_Eval used for pruning is now full eval instead of lazy eval

Pruning margins based in static eval are lowered a lot

No changes in NN (still 2.0.1 versión)

Estimate ELO at long TC (CCRL) 3220               

Bench nodes : 6597928     

Caligula 2.2 vs other engines:

Echekinator 1.0	2/2	+2	2 games
Jackychess 25.09 JA	2/2	+2	2 games
Moodle 0.10	2/2	+2	2 games
Shark 2025-10-13	2/2	+2	2 games
Chess-rs 0.6.0 JA	2/2	+2	2 games
CeeChess 2.2	2/2	+2	2 games
Kreveta 1.2.4	2/2	+2	2 games
Chessnix 1.0	1.5/2	+1	2 games
Tarnished 4.0 dev.1137 JA	1/2	+0	2 games
Wilted 1.0.0.0	1/2	+0	2 games
Critter 1.6a	1/2	+0	2 games
Vajolet2 Perspective v1 JA	0.5/2	-1	2 games
Isa 4.5	0.5/2	-1	2 games
Quirky 2.1	0/2	-2	2 games
Halogen 15.21.0	0/2	-2	2 games
PlentyChess 7.0.22	0/2	-2	2 games
Prune 2.2.0	0/2	-2	2 games
Reckless 0.9.0 dev.967b JA	0/2	-2	2 games
Lc0 0.32.1	0/2	-2	2 games
Ynode 0219	0/2	-2	2 games
Halogen 15.23.0	0/2	-2	2 games

Author: Pedro Castro, Rating Chess Engines Diary CEDR=2761

Jim Ablett compiles:
Caligula 4.0 - download

Caligula homepage: https://sites.google.com/view/dirtychess/dirtychess