New J.A Compiles

[Jim Ablett]

An update to my experimental nnue branch.
Add hybrid nnue mode.
Jim.

Hi Jim, is it possible, the net is not (correct) used? I got following results (same as version without a net):

1 Dirty Catpaw x64 +147 +53/=34/-13 70.00% 70.0/100 (2898)
2 Olithink 5.11.9 -147 +13/=34/-53 30.00% 30.0/100 performance 2751 +36

Olithink NNUEhybrid 2025 (use NNUE + Hybrid Eval)
1 Dirty Catpaw x64 +143 +50/=39/-11 69.50% 69.5/100
2 Olithink 5.11.9NNh x64 -143 +11/=39/-50 30.50% 30.5/100 2755

Olithink NNUE 2025 (default, only the net)
1 Dirty Catpaw x64 +135 +47/=43/-10 68.50% 68.5/100
2 Olithink 5.11.9NN x64 1CPU -135 +10/=43/-47 31.50% 31.5/100 2763

Hi Werner,

I'll check. Thanks for the test.

Jim.

[Jim Ablett]

https://phalanx.sourceforge.net/
Phalanx XXV UCI by Dusan Dobes

Phalanx XXV UCI 64 JA

Update:

Added UCI skill level system for human player.

Key Features
ELO Range: 1000 (beginner) to 2700 (maximum strength), with 18 calibrated profiles in between

Strength Adjustments:
Depth limiting: Weaker levels search shallower (1000 ELO searches to ~200 plies, 2700 searches to ~10000)
Evaluation noise: Random perturbations added to evaluations (-80 to +80 cp for beginners, 0 for strong levels)
Smooth scaling: Linear progression creates realistic strength transitions
-----------------------------------------------------------------

3-fold draw avoidance logic.
When a 3-fold repetition would occur, the engine calculates the current position evaluation
If ahead by 300+ centipawns (configurable), it refuses the draw and continues searching
If not ahead by the threshold, it accepts the draw normally

Configurable Threshold:
Default: 300 centipawns
GUI can adjust via: setoption name RepetitionThreshold value X
Range: 0-2000 centipawns
Value 0 disables the feature entirely

Strategic Benefits:
Engine won't accept draws when clearly winning
Maintains ability to accept draws when behind
Can be tuned per engine strength or opening book preference
Configurable by GUI users
---------------------------------------------------------------

Fixes to mate search.

Proton link:
https://drive.proton.me/urls/NPS4958HWW#DkVXbeNnkdg1

Smash link:
https://fromsmash.com/Phalanx-XXV64JA

Jim.

[Werner]

Olithink NN Old 2025 the first version from JA: olithink_5116_nnue_bmi2_ja.exe 472.064 14.09.2025 19:58 -a--
1 Olithink 5.11.6nnue old +70 +40/=40/-20 60.00% 60.0/100 (2967) +216 !!
2 Dirty Catpaw x64 -70 +20/=40/-40 40.00% 40.0/100 (2897)

[Jim Ablett]

Olithink NN Old 2025 the first version from JA: olithink_5116_nnue_bmi2_ja.exe 472.064 14.09.2025 19:58 -a--
1 Olithink 5.11.6nnue old +70 +40/=40/-20 60.00% 60.0/100 (2967) +216 !!
2 Dirty Catpaw x64 -70 +20/=40/-40 40.00% 40.0/100 (2897)

I've found a bad bug that made engine always fall back to traditional eval. Just running some tests now.
Update released soon.

Thanks Werner,
Jim.