Chess engine: Wahoo 4.0.0 (for Windows and Linux)

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============================== My email: jotes@go2.pl

Chess engine: Wahoo 4.0.0 (for Windows and Linux)

Wahoo - UCI chess engine Rating CEDR=2982

Author: Andrew Hockman

v.4.0.0:

Estimated Elo

3000 CCRL 40/15

ELO | 256.55 +- 9.83 (95%)

CONF | 8.0+0.08s Threads=1 Hash=32MB

GAMES | N: 5024 W: 3502 L: 346 D: 1176

https://chess.swehosting.se/test/3641/

ELO | 232.69 +- 13.03 (95%)

CONF | 40.0+0.40s Threads=1 Hash=128MB

GAMES | N: 2500 W: 1634 L: 172 D: 694

https://chess.swehosting.se/test/3640/

Author's Note

During my time spent developing version 4 I became very interested in king safety evaluation features, and as a result dramatically shifted the way that Wahoo plays. Based on my observations, it does a much better job of keeping its own king safe, while also exploiting enemy weaknesses much more cleanly. I also developed an experimental version that replaced HCE king safety with a small neural network. I may release this version separately at some point in time, as it did result in an improvement of some 24ish Elo.

New Engine Features

Use More Increment: +6 Elo #118

Use TT Score as Static Eval: +14 Elo #119

RFP before NMP: +11 Elo #120

Nonlinear King Safety Re-write: +41 Elo #123

King Rank (Safety): +12 Elo #125

Xray Mobility and Safety: +14 Elo #126

More Safety Params: +10 Elo #128

Piece Tropism (Safety): +15 Elo #130

Pawn Storm (Safety): +6 Elo #132

SEE Pruning: +54 Elo #135

SEE Move Ordering: +16 Elo #136

Exclude Qsearch Losing Captures: +17 Elo #137

Late Move Pruning: +27 Elo #138

Rule of Square for Passers: +11 Elo #140

Prevent Unsound Pruning when Mate is Found: +7 Elo #142

New LMP Formula: +35 Elo #143

Improving in LMP: +21 Elo #146

Improving in RFP: +10 Elo #147

Safety-Related Pawn Structure: +9 Elo #159

Safety Pawn Structure Improvement: +5 Elo #160

Queen Contact Checks (Safety): +10 Elo #161

Side-to-move Relative Threats: +4 Elo #162

Mirror PSTs: +9 Elo #164

Node Time Management: +10 Elo STC #167

Opposite Colored Bishop Endgame Handling: #168

Bugfixes

Wahoo no longer reports bogus mate scores due to broken mate distance pruning

x86_64-v1 is the slowest but compatible with almost anything.

x86_64-v2 is faster but is compatible with CPUs pre-Haswell/Excavator.

x86_64-v3 is faster still and recommended on modern systems.

x86_64-v4 is the fastest but requires AVX-512 support.

Wahoo 4.0.0 download

github:https://github.com/spamdrew128/Wahoo/releases/tag/4.0.0

Comments

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