Prune - UCI chess engine
Author: Thomas Girolami
Prune 3.1.0 - what's new?
this new version have:
an HCE build, as it can be funny to do some trick on HCE, however:
will be less important than nnue version (we will be more focused on the nnue version), but HCE only patch are accepted
is a lot weaker than the nnue, most likely between 2700-2800
a new nnue, with 128 HL and 8 outputs buckets, now trained using bullet
some search patches as:
removing delta pruning (+50 in non-regr test)
reduce more the depth for NMP
history score based reduction for LMR
double and negative extension
some new features, as:
Late Move Pruning
some kind of history pruning
some speedup, as:
prefetching TT entry
faster index calculation for TT (was also surely better, as it is uniform now)
STC progress:
Results of prune v3.1.0 vs prune v3 (10+0.1, 1t, 16MB, UHO_Lichess_4852_v1.epd):
Elo: 269.85 +/- 9.25, nElo: 408.67 +/- 9.63
LOS: 100.00 %, DrawRatio: 14.44 %, PairsRatio: 48.74
Games: 5000, Wins: 3575, Losses: 321, Draws: 1104, Points: 4127.0 (82.54 %)
Ptnml(0-2): [4, 39, 361, 891, 1205], WL/DD Ratio: 3.15
LTC progress:
Results of prune v3.1.0 vs prune v3 (60+0.6, 1t, 128MB, UHO_Lichess_4852_v1.epd):
Elo: 238.84 +/- 10.31, nElo: 388.03 +/- 12.43
LOS: 100.00 %, DrawRatio: 15.13 %, PairsRatio: 46.15
Games: 3000, Wins: 1965, Losses: 176, Draws: 859, Points: 2394.5 (79.82 %)
Ptnml(0-2): [1, 26, 227, 675, 571], WL/DD Ratio: 1.87
against stash 36:
Results of prune v3.1.0 vs stash 36 (10+0.1, 1t, 16MB, UHO_Lichess_4852_v1.epd):
Elo: 3.96 +/- 7.50, nElo: 5.09 +/- 9.63
LOS: 84.98 %, DrawRatio: 38.40 %, PairsRatio: 1.10
Games: 5000, Wins: 1797, Losses: 1740, Draws: 1463, Points: 2528.5 (50.57 %)
Ptnml(0-2): [256, 478, 960, 565, 241], WL/DD Ratio: 3.57
Results of dev vs base (60+0.6, 1t, 128MB, UHO_Lichess_4852_v1.epd):
Elo: -6.95 +/- 10.84, nElo: -9.77 +/- 15.23
LOS: 10.44 %, DrawRatio: 42.10 %, PairsRatio: 0.94
Games: 2000, Wins: 654, Losses: 694, Draws: 652, Points: 980.0 (49.00 %)
Ptnml(0-2): [84, 214, 421, 220, 61], WL/DD Ratio: 2.86
so a small antiscaler detected against stash 36
test of pruneHCE, against stash 23:
Results of pruneHCE 3.1.0 vs stash 23 (10+0.1, 1t, 16MB, UHO_Lichess_4852_v1.epd):
Elo: -3.82 +/- 7.85, nElo: -4.69 +/- 9.63
LOS: 17.00 %, DrawRatio: 37.80 %, PairsRatio: 0.99
Games: 5000, Wins: 1845, Losses: 1900, Draws: 1255, Points: 2472.5 (49.45 %)
Ptnml(0-2): [317, 466, 945, 499, 273], WL/DD Ratio: 5.52
Results of prune HCE 3.1.0 vs stash 23 (60+0.6, 1t, 128MB, UHO_Lichess_4852_v1.epd):
Elo: 27.68 +/- 12.22, nElo: 34.64 +/- 15.23
LOS: 100.00 %, DrawRatio: 36.60 %, PairsRatio: 1.47
Games: 2000, Wins: 801, Losses: 642, Draws: 557, Points: 1079.5 (53.97 %)
Ptnml(0-2): [91, 166, 366, 247, 130], WL/DD Ratio: 4.08
Prune 2.0.1 vs other engines:
| Eubos 4.2 JA | 2/2 | +2 | 2 Games |
| Colossus 2025b | 1/2 | +0 | 2 Games |
| Bread Engine 2.0.0 | 0.5/2 | -1 | 2 Games |
| Qapla 0.3.2 | 0.5/2 | -1 | 2 Games |
| Reyna 1.0 | 0.5/2 | -1 | 2 Games |
| Tcheran v6.0 | 0.5/2 | -1 | 2 Games |
| c4ke v1.0 | 0.5/2 | -1 | 2 Games |
| PZChessBot 5.0 | 0/2 | -2 | 2 Games |
| Publius 1.0 slow | 0/2 | -2 | 2 Games |
| Arcanum 2.7 | 0/2 | -2 | 2 Games |
| Bitbit 1.6 | 0/2 | -2 | 2 Games |
| Minke 3.0.0 | 0/2 | -2 | 2 Games |
| Cwtch 3 | 0/2 | -2 | 2 Games |
| Critter 1.6a 64-bit | 0/2 | -2 | 2 Games |
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