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Wahoo v4.0.0

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@spamdrew128 spamdrew128 released this 31 Aug 12:05
· 1 commit to main since this release
4.0.0
abfe938
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Learn about vigilant mode.

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

Binaries

Wahoo's release scheme follows the microarchitecture levels.

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.

Assets 10
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