Meltdown 1.11 - new version chess engine (Windows and Linux)

Meltdown - UCI chess engine

Author: Hans Binderup

NOTE: this is a hobby project that is work in progress.

C++26 chess engine.

Meltdown 1.11 - what's new in this version?

see_swap: fix initial and promotion score by @hansbinderup in #194

searcher: align history moves with correction by @hansbinderup in #195

term_methods: correct piece attacks mask | correct rook on 7th by @hansbinderup in #196

searcher: add see pruning by @hansbinderup in #197

spsa: apply parameters from 23-08-25 tuning by @hansbinderup in #198

static_evaluation: add endgame scaling by @hansbinderup in #200

terms: add queen discovered attack by @hansbinderup in #199

git: add 'subprojects' to gitignore by @hansbinderup in #201

spsa: apply 03-10-25 tuning by @hansbinderup in #202

How strength improved - tests

Test results (v1.11 vs v1.10)

Elo | 85.88 +- 10.67 (95%)

Conf | 8.0+0.08s Threads=1 Hash=128MB

Games | N: 2006 W: 849 L: 363 D: 794

Penta | [17, 113, 381, 351, 141]

Elo | 88.74 +- 14.59 (95%)

Conf | 40.0+0.40s Threads=1 Hash=256MB

Games | N: 1000 W: 408 L: 158 D: 434

Penta | [7, 49, 195, 185, 64]

Elo | 67.55 +- 13.18 (95%)

Conf | 40.0+0.40s Threads=4 Hash=256MB

Games | N: 1000 W: 355 L: 163 D: 482

Penta | [5, 59, 212, 187, 37]

Meltdown 1.10 vs other engines:

Clockwork dev.2cbd JA	4/4	+4	4 Games
Pluto 1.0.1	2/4	+0	4 Games
Potential 2.0.0 JA	1.5/4	-1	4 Games
Clover 8.2.5	0/4	-4	4 Games
Pawnocchio 1.8.1	0/4	-4	4 Games
Patricia 5.0	0/4	-4	4 Games
Prelude Fusion 2.0	1/3	-1	3 Games
Tarnished 4.0	0/3	-3	3 Games
Shuffle 5.2.0 JA	2/2	+2	2 Games
LazySMP 9.0	2/2	+2	2 Games
Rodent IV 0.33 JA	2/2	+2	2 Games
Casanchess 0.9	2/2	+2	2 Games
Bread Engine 1.5.0	1.5/2	+1	2 Games
Princhess 0.20.0 JA	1/2	+0	2 Games
Admete 1.8.0	1/2	+0	2 Games
Halogen 14.0.0	0.5/2	-1	2 Games
Oxide 2.0.0	0.5/2	-1	2 Games
Stockfish dev-20250728	0.5/2	-1	2 Games
Heimdall 1.4.0	0/2	-2	2 Games
Arcanum 2.6	0/2	-2	2 Games
Critter 1.6a	0/2	-2	2 Games

Meltdown 1.11 download