Latest Update: 26.05.2024
Hello Chess Friends,
1st of all, let Me start please with this new saying:The more I learn about Top NNUE engines,The more I see Top similarity each other!
To be more clear,Similarity tools are not so dead, but even rather I would sayThe ORIGINALITY is almost dead when it comes to NNUE!
But I admit too we have many programmers who are honestAnd do not hide from where come theirs eng origins...right?What about all others eng programmers? if still not so clear:All these strong ideas are came directly from MARS or ?) andHow many of the created engines are started from scratch ?)For these reasons, I like the authors of SF-based engines too!If nothing else..these authors are fair...and give Me one reason    To not test Raubfish or RapTora or Fat Fritz..since these enginesSuit to the current used rules (up to 70% in similarity is allowed)
Btw, you can download the latest SIMEX2's Test ResultsWhere I assume you'll see/know about what is going on...
And here are the latest played results (main target 3600+):
    The Champion is again Stockfish 16.1- Congratulations to Stockfish Team!    And strange that latest SF dev. performed worse, normally newer should be better..
Rank Name               Elo    +    - games score oppo. draws    1 Stockfish 16.1    3772    5    5  2000   65%  3693   70%    2 Stockfish 210524  3769    5    5  2000   64%  3694   71%    3 RapTora 2.2       3761    6    7  1200   58%  3715   81%    4 Raubfish X48c3    3746    7    7  1200   55%  3717   81%    5 K.Dragon 3.3      3740    6    6  1500   54%  3713   84%    6 Berserk 13        3736    6    6  1500   54%  3713   86%    7 Obsidian 12       3726    6    7  1200   55%  3703   79%    8 Fat Fritz 2       3703    5    5  1700   54%  3682   77%    9 Caissa 1.18       3703    6    6  1400   48%  3717   84%   10 Obsidian 11       3699    7    7  1100   48%  3709   84%   11 RubiChess 0124    3692    7    6  1300   46%  3717   84%   12 Alexandria 6.1.0  3688    7    7  1200   47%  3703   82%   13 CSTal 2.00        3684    7    7  1200   57%  3643   79%   14 Titan 1.0.0       3683    6    6  1200   49%  3687   75%   15 PlentyChess 1.0   3683    7    7  1200   46%  3703   81%   16 Koivisto 090223   3678    7    7  1200   56%  3643   77%   17 Clover 6.1.19     3678    7    7  1200   45%  3707   81%   18 Rebel 16.3        3675    7    6  1300   45%  3703   82%   19 Uralochka 3.41a   3670    6    6  1200   47%  3684   71%   20 Seer v2.8         3667    7    7  1200   43%  3705   78%   21 rofChade 3.1      3662    7    7  1200   53%  3640   74%   22 Revenge 3         3659    7    7  1300   52%  3643   78%   23 Igel 3.5.0        3655    7    7  1200   50%  3654   81%   24 Velvet v7.3.0     3645    6    6  1300   42%  3685   66%   25 Viridithas 12     3643    7    7  1200   50%  3641   77%   26 Fire 8NN MC3      3631    7    7  1200   50%  3630   79%   27 BlackMarlin 9     3631    7    7  1200   49%  3635   75%   28 Arasan 24.2.2     3624    6    6  1300   39%  3683   69%   29 SlowChess 2.9     3622    7    7  1300   46%  3647   76%   30 Lizard 10.3       3619    7    7  1200   46%  3646   75%   31 Stormphrax 4.1.0  3617    7    7  1200   45%  3649   73%   32 Altair 7.0.0      3612    7    7  1200   44%  3646   74%   33 Booot 7.3         3608    7    7  1200   44%  3647   72%   34 Motor 0.40        3582    6    6  1200   32%  3676   60% 
      • Calculated by Bayeselo / K. Dragon fixed to 3740  /  Blue Name = Last Update
More Details:• All NNUE engines are mainly AVX2 and tested via default Evalfiles• The Overall Draw-ratio (based on 22100 games) is not so high 77% • All of played games are available (in PGN) SCCT CS  L / Fire 8NN
And a few more words about original Top chess engines,Before NNUE, the similarity was mainly up to 40% - 50%,Where sounds perfectly fine to Me, at least not so high!But nowadays these numbers are increased av. 60% - 70%Sure I refer about using 100 ms and 1 core but just if using Slower TC and more cores, then similarity is much higher!Besides, I refer also about such Top engines, which are Considering as ORIGINAL (by vast majority of people)!
Meanwhile, if I am not going to use the Similarities tools,Then I wonder: who are best experts in recognizing the Originality of the engines? Because I see many testers,Who refuse to test many of the available Top engines,Very likely such as in their eyes: they are non-original,Where theirs tested engines are as original work, sureThis is a long story, but as last words,I wish to say over: Trust, but verify! 
Because for less double standards:I'm doing my best to prefer that way and what about you?
Ok .. hope helps and have a nice weekend )

Best,Sedat