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Superultra 2.1 - new version chess engine

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Superultra (NNUE)
Rating Chess Engines Diary CEDR=3488

Superultra is a UCI compliant chess engine that uses an alpha-beta search framework, various heuristics and optimization techniques, and an efficiently updatable neural network (NNUE) in order to analyze chess positions and calculate moves.

v.2.1:
Major Changes:
Significantly reduced required stack size
Changed all types away from (u)int_fastN_t
Style
Elo (STC 6+0.06)
Score of Superultra-2.1 vs Superultra-2.0: 805 - 676 - 1292  [0.523] 2773
...      Superultra-2.1 playing White: 455 - 282 - 650  [0.562] 1387
...      Superultra-2.1 playing Black: 350 - 394 - 642  [0.484] 1386
...      White vs Black: 849 - 632 - 1292  [0.539] 2773
Elo difference: 16.2 +/- 9.4, LOS: 100.0 %, DrawRatio: 46.6 %
SPRT: llr 2.95 (100.0%), lbound -2.94, ubound 2.94 - H1 was accepted
Elo (LTC 30+0.1)
Score of Superultra-2.1 vs Superultra-2.0: 1346 - 1210 - 2837  [0.513] 5393
...      Superultra-2.1 playing White: 797 - 463 - 1436  [0.562] 2696
...      Superultra-2.1 playing Black: 549 - 747 - 1401  [0.463] 2697
...      White vs Black: 1544 - 1012 - 2837  [0.549] 5393
Elo difference: 8.8 +/- 6.4, LOS: 99.6 %, DrawRatio: 52.6 %
SPRT: llr 2.95 (100.3%), lbound -2.94, ubound 2.94 - H1 was accepted

Superultra 2.0 vs other engines:
Booot 7.312/23+123 Games
Slowchess 2.98/17-117 Games
Dragon free6/14-214 Games
Tenax 1.06/12+012 Games
Peacekeeper 3.015.5/12-112 Games
Minic 3.415/10+010 Games
Arasan 24.2.24.5/8+18 Games
Pawn 3.0 JA4.5/8+18 Games
Igel 3.5.5 JA4/8+08 Games
Pawn 3.04/8+08 Games
Texel 1.114/8+08 Games
Altair 7.1.5 JA3.5/8-18 Games
Alexandria 6.02.5/7-27 Games
Eman 9.902.5/7-27 Games
Koivisto 9.22.5/7-27 Games
Lambergar 0.4.16/6+66 Games
Cheng 4.455.5/6+56 Games
Smallbrain 7.04.5/6+36 Games
Peacekeeper 2.304/6+26 Games
Midnight 94/6+26 Games
BlackCore 6.03.5/6+16 Games


Superultra 2.1 download


Games

ChessBase

Superultra 2.0–Stockfish 20240121½–½C672024.02.02.NewEnginesTest, Błysk 3.0mi2.1104.02.2024
1.e4 e5 2.f3 c6 3.b5 f6 4.0-0 xe4 5.e1 d6 6.xe5 xe5 7.xe5+ e7 8.f1 0-0 9.d4 e8 10.d5 c5 11.e1 d6 12.c3 f5 13.d3 g6 14.e4 f6 15.xc5 dxc5 16.c4 e8 17.f1 d6 18.d2 c6 19.xe8+ xe8 20.dxc6 xc6 21.f3 d7 22.c3 f6 23.b3 c7 24.d5+ f7 25.d2 e5 26.d1 f8 27.d6+ xd6 28.xd6 c6 29.f2 e7 30.d1 g6 31.g4 d8 32.xd8 xd8 33.e3 b6 34.h4 h5 35.b4 f7 36.bxc5 bxc5 37.f4 b1 38.a3 hxg4 39.fxg4 g5+ 40.hxg5 fxg5+ 41.f3 e6 42.d2 e5+ 43.g3 a2 44.xg5 xc4 45.h3 d3 46.g2 e2 47.b7 xg4 48.c8+ e5 49.xg4 xg4 50.xg4 c4 51.f3 d4 52.c1 d3 53.g5 a6 54.f4 c3 55.e5 c4 56.e4 b3 57.c1 c2 58.e3 a5 59.d4 b2 60.c4 xa3 61.xc3 a2 62.c2 a1 63.b3 b1 64.a3 a4 65.xa4 ½–½
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