What are the most aggressive engines?

[menniepals]

Open Tal, Zappa Mexico 2, Stockfish 12, Benjamin 1.1, Gambit Fruit, Chess Tiger. Anything else?

[menniepals]

Rhetoric, Gambit Tiger (is this engine still available)?

[pohl4711]

Open Tal, Zappa Mexico 2, Stockfish 12, Benjamin 1.1, Gambit Fruit, Chess Tiger. Anything else?

Look at my EAS-Ratinglist (and below the all-time Top10 EAS-Ratinglist):
https://www.sp-cc.de/eas-ratinglist.htm

[Werewolf]

Is that list showing aggression or a tendency to sacrifice?

[supersharp77]

Rhetoric, Gambit Tiger (is this engine still available)?

Legendary Gambit Tiger Is Available Only in the Older Fritz Gui's (Fritz 11 and Older) or In Lokasoft-Rebel Tiger Gui's...Chess Tiger UCI has a "Gambit Setting"....

Want Aggression?.... Chessmaster (The King) Engines....Thinker 5.3B.......Thinker 5.1C....Szint Tal...Szint Alekhine
Chess System Tal......Rodent Risky....Beth Harmon w Gambit Books.....Cfish (Gambit Books) LC0 (Gambit)... Zchess 2.00
Aristarch 4.21 Stockfish v1.0 Gothmog wb & uci Houdini v1.0....RobbolitoE4.....Ivanhoe Mini....Deep Sjeng v1.5
Rodent (Tal Books) Glaurung 1.0.3.....Gull II JA....Fritz 10....Hiarcs 10....Deep Shredder 10... Deep Shredder.. Shredder 10
Shredder 12 SE... Fruit 07011a (Tactical settings) Fruit 0166115a (Leiden 2006 Tactical Setup)....Firebird....Fish Cooking...
Funfish....Stuckfish 0.1 MCTS Sugar.....Sugar 1.6.1 Panchess 0.220.... Good Luck!!

[pohl4711]

Is that list showing aggression or a tendency to sacrifice?

It shows both. And more!
The EAS-Score is a point-system, built out of percentage of games with sacs, short wins, average win game length and the bad draws (draws in middlegame or draws after engine had a material advantage in the game). So, the EAS-score shows the aggressiveness of an engine.
But you can look at the single stats, too. As an example, we compare the stats of Velevet 4.1.0 and Dragon 3 aggressive in my all time top-10 EAS-Ratinglist (below) ad we see here, that Dragon 3 aggressive plays some more sacs than Velvet 4.1.0, but Velvet has some more short wins (and a lower average length of won games overall). So, as a conclusion, we can say here, Velvet plays more "straight foreward" for a win than Dragon 3 aggressive, but Dragon 3 aggressive play more sacs...
And my EAS-Tool builds another 2nd ratinglist with all single stats of sacs and short wins (too much numbers to post it here, but you can see it on my website). In this single stats (for example) it can be seen, that Pedone 3 plays more high sacs (queen sacs, rook sacs etc.) than all other engines (and high sacs give much more EAS-points than low sacs), and this is the explanation for the good EAS-score of Pedone 3...
https://www.sp-cc.de/files/spcc_full_list.txt
(The 2nd EAS-Ratinglist is at the bottom of this file)

Like all my other work, the EAS-tool is free for download on my website, it can be used on all pgn-file with engine-games. But it is suggested, that the engines have played a lot of games for a valid EAS-scoring. I recommend at least 100 (better 300) won games of each engine, that means, engines should have played around 1000 games in the pgn.file. At least... For my EAS-ratinglist, I use the played games of my SPCC-Ratinglist, where each engine plays at least 7000 games.
https://www.sp-cc.de/files/engines_aggr ... cs_tool.7z
(In the download, you find a readme-file. In there, the EAS-point system is explained)

Code: Select all

                                 bad  avg.win 
Rank  EAS-Score  sacs   shorts  draws  moves  Engine/player          SPCC-Elo
-----------------------------------------------------------------------------
   1    275864  35.22%  42.68%  15.64%   64   Velvet 4.1.0 avx2       3368
   2    261076  36.44%  35.46%  12.71%   68   Revenge 1.0 avx2        3476
   3    241188  24.57%  30.02%  22.45%   70   Pedone 3 avx2           3342
   4    235546  38.26%  32.04%  10.14%   70   Dragon 3 aggressive     3301
   5    228109  34.52%  33.42%  13.57%   68   Uralochka 3.37c avx2    3468
   6    223392  29.38%  36.61%  15.97%   66   Arasan 23.0.1 avx2      3340
   7    222050  31.46%  31.02%  14.74%   70   Danasah 9.0 avx2        3223
   8    218065  30.02%  34.50%  13.40%   69   Rebel 14.1 avx2         3235
   9    182309  30.06%  23.83%  15.64%   72   Slow Chess 2.5 avx2     3432
  10    168433  23.96%  32.79%  21.16%   69   Wasp 6.00 avx           3434
-----------------------------------------------------------------------------
*** Average length of all won games in the full ratinglist-base:  76 moves 
-----------------------------------------------------------------------------

[carldaman]

Is that list showing aggression or a tendency to sacrifice?

It is kind of hard to always attack and not sac much. I guess the 'aggression' mentioned here also implies kingside attacks.
I suppose it is important to define aggression in this context, so we know what we mean by it.

Anyway, any list would have to include Velvet, the engine of the year in 2022, imho.
It is a savage sacker-attacker, while sporting a rating of 3300+ CCRL!! No trading away strength for style here!
Congratz to Martin Honert for creating such a beast!

The iron fist inside the velvet glove, lol!

OpenTal is only GM strength, others like Zappa DA may be close, but nothing like Velvet to pack such great strength into that style.
Even the private Nezh I'm familiar with is only of human Super-GM/World Champ strength.

[pohl4711]

Anyway, any list would have to include Velvet, the engine of the year in 2022, imho.
It is a savage sacker-attacker, while sporting a rating of 3300+ CCRL!! No trading away strength for style here!
Congratz to Martin Honert for creating such a beast!

Yes, but in my full EAS-ratinglist, it can be seen, that the latest version Velvet 5.0.0 lost EAS-points (213205), compared to V4.1.0 (282189). So, I would recommend to use V4.1.0 (plays only -30 Elo weaker than V5.0.0)

Code: Select all

                                  bad  avg.win 
Rank  EAS-Score  sacs   shorts  draws  moves  Engine/player 
-------------------------------------------------------------------
   1    282189  35.59%  42.40%  14.89%   64   Velvet 4.1.0 avx2  
   2    261076  36.44%  35.46%  12.71%   68   Revenge 1.0 avx2  
   3    257404  31.32%  44.61%  15.44%   64   Velvet 4.0.0 avx2  
   4    251243  38.99%  33.01%  09.93%   69   Dragon 3 aggressive  
   5    241188  24.57%  30.02%  22.45%   70   Pedone 3 avx2  
   6    236353  31.95%  34.51%  16.05%   67   Velvet 3.3.0 avx2  
   7    228109  34.52%  33.42%  13.57%   68   Uralochka 3.37c avx2  
   8    224016  31.54%  32.01%  14.46%   70   Danasah 9.0 avx2  
   9    223392  29.38%  36.61%  15.97%   66   Arasan 23.0.1 avx2  
  10    221094  35.15%  29.28%  13.37%   70   Arasan 23.2 avx2  
  11    218065  30.02%  34.50%  13.40%   69   Rebel 14.1 avx2  
  12    213205  27.67%  39.56%  16.03%   65   Velvet 5.0.0 avx2  
  

[carldaman]

Rhetoric, Gambit Tiger (is this engine still available)?

Both of those are old favorites of mine. Rhetoric is free and probably underappreciated, of strong GM strength.
It can be tweaked to sac more while retaining a lot of its strength.

[pohl4711]

OpenTal is only GM strength, others like Zappa DA may be close, but nothing like Velvet to pack such great strength into that style.

Sorry, but my EAS-Ratinglist shows clearly, that Revenge 1.0 is the strongest engine with a very high EAS-score (EAS-score is between Velvet 4.1.0 and Velvet 4.0.0). And Revenge 1.0 is more than 100 Elo stronger than Velvet 4.1.0 (!) in my SPCC-ratinglist.
But Revenge 1.0 is commercial. Velvet is free.
Sadly, Revenge 2.0 and 3.0 lost more and more EAS-points... So, only Revenge 1.0 plays such a nice aggressive style.