New chess engine: Protej 0.6.6

Protej - UCI chess engine, Author - Alex Brunetti

Rating CEDR=3251

Protej - rating CEDR progress:

Pl	Engine	Rating	Score	Games	%
977	Protej 20231226b	3251.0	41.50	78	53.21
1070	Protej 20231108c	3126.8	77.50	362	21.41
1105	Protej 20231118d	3093.1	120.00	360	33.33
1132	Protej 20231212a	3073.0	54.50	185	29.46
1133	Protej 20230919a	3071.1	199.50	614	32.49
1153	Protej dev_20231212a	3053.6	17.00	51	33.33
1157	Protej dev_20231226b	3050.9	8.00	26	30.77
1197	Protej 0.6.5	2996.3	198.50	461	43.06
1245	Protej 0.6.4	2926.2	125.00	344	36.34
1265	Protej 0.6.2	2898.3	52.50	133	39.47
1332	Protej 0.6.3	2797.6	202.50	462	43.83
1705	Protej 0.58a	2259.1	42.00	59	71.19

v.0.6.6:

New official release.

It includes all updates released with the dev versions after Protej 0.6.5:

evaluation of attacked, defended and undefended pieces optimized

search parameters tuned

code restructuring with grouping of types, constants, and global functions

optimization of tapered scores handling routines

search functions: parameter tuning, code optimization, and improved execution speed

removal of certain data structures, replaced by calculation functions

refinement of the outpost evaluation function

introduction of the singular extension

parameter tuning for reduction handling in singular nodes

massive optimization of types, variables, and data structures

introduction of new assembler functions.

Non-functional changes:

improved printing related to compilation date

debug: in console, the function displaying the position now indicates values in centipawns instead of pawns.

It includes also:

deactivated certain endgame evaluation functions due to underperformance

PST values tuned.

Non-functional changes:

material and pawn hash sizes are now fixed

default moveOverhead value is now 10 mSec

default syzygyOnline is now false

updated the copyright year to 2024.

Protej 0.6.6 download