Prune 3.2.1 - new version chess engine

Prune - UCI chess engine

Author: Thomas Girolami

v.3.2.1: Fix Windows stack size issue preventing NNUE from loading correctly and causing engine crashes.

Prune 3.2.0 - what's new?

this new version has :
a new nnue (1024 HL with horizontal mirroring)
a lot of search patches :

• nmp verification
• evasion in qs
• totally tuned parameters (2k iterations of 16 games tc=40+0.4)
• clusters for the TT
• capthist, that makes able to add capthist pruning
  added bm stability too
  (this is not exhaustive)

some very good results :

Results of prune dev vs prune v3.1.0 (10+0.1, 1t, 16MB, UHO_Lichess_4852_v1.epd):
Elo: 146.61 +/- 7.26, nElo: 218.41 +/- 9.63
LOS: 100.00 %, DrawRatio: 27.92 %, PairsRatio: 9.36
Games: 5000, Wins: 2624, Losses: 631, Draws: 1745, Points: 3496.5 (69.93 %)
Ptnml(0-2): [30, 144, 698, 1059, 569], WL/DD Ratio: 1.58

... with very good scaling:

Results of prune-dev-ltc vs base (60+0.6, 1t, 128MB, UHO_Lichess_4852_v1.epd):
Elo: 180.35 +/- 9.74, nElo: 335.54 +/- 15.23
LOS: 100.00 %, DrawRatio: 21.70 %, PairsRatio: 45.06
Games: 2000, Wins: 1086, Losses: 132, Draws: 782, Points: 1477.0 (73.85 %)
Ptnml(0-2): [0, 17, 217, 561, 205], WL/DD Ratio: 1.13

for the HCE version, a lot smaller results, but still good ones :

Results of pruneHCEv3.2.0 vs pruneHCEv3.1.0 (10+0.1, 1t, 16MB, UHO_Lichess_4852_v1.epd):
Elo: 57.50 +/- 6.83, nElo: 82.60 +/- 9.63
LOS: 100.00 %, DrawRatio: 37.76 %, PairsRatio: 2.28
Games: 5000, Wins: 1872, Losses: 1052, Draws: 2076, Points: 2910.0 (58.20 %)
Ptnml(0-2): [76, 398, 944, 794, 288], WL/DD Ratio: 1.14

Results of pruneHCEv3.2.0 vs pruneHCEv3.1.0 (60+0.6, 1t, 128MB, UHO_Lichess_4852_v1.epd):
Elo: 69.17 +/- 9.95, nElo: 108.73 +/- 15.23
LOS: 100.00 %, DrawRatio: 38.70 %, PairsRatio: 2.95
Games: 2000, Wins: 741, Losses: 348, Draws: 911, Points: 1196.5 (59.82 %)
Ptnml(0-2): [10, 145, 387, 358, 100], WL/DD Ratio: 0.90

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

 

Prune 3.2.1 - download