Rebel 16.2: Impressive!

[Steve Maughan]

I haven't seen much discussion on here about the latest version of Rebel, but from my tests it is quite impressive. In case you're not aware, it's a combined effort of two veterans of the CC industry — Ed Schroder and Chris Whittington. I played a bullet match of 100 games between the new Rebel and Shredder 13: 1 min + 1 sec per move, used the Shredder 13 book. The result was 74 wins for Rebel, 2 loses and 24 draws. I know it's a small sample but that implies Rebel is +300 ELO better than Shredder 13. That's amazing. I was also impressed at how aggressive and tactically aware Rebel is. In some of my tests it found tactics quicker than Stockfish. Anyway, it is a fun engine to use. You can get it from this link:

http://rebel13.nl/windows/rebel-16.html

Enjoy,

Steve

[Jouni]

There is already test result

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01: Lc0 0.28.0 Nvidia RTX 3060 [j92-100]                      463,0/550
02: Stockfish14_x64_avx2 [t8]                                 456,0/550
03: Rebel-16.2 [t8]                                           455,5/550
04: Lc0 0.28.2 Nvidia RTX 3060 [752187]                       453,0/550
05: Stockfish_13_win_x64_avx2 [t8]                            450,0/550
06: Ethereal-13.75-pext-avx2 [t8]                             443,0/550
07: Ethereal-14.00-pext-avx2 [t8]                             441,0/550
08: Stockfish_15_x64_avx2 [t8]                                436,0/550
09: Dragon-2.5-64bit-avx2 [t8]                                435,5/550
10: Ethereal-13.50-pext-avx2 [t8, e1350standard]              426,5/550

[Rebel]

I got the PGN of this tournament and did some research.

Rebel played only 10 games against each of the 55 engines. Meaning, the tournament results rely on previous results looking at the fact all engines played a lot more games than 10, 400-460 actually.

Some statistics that show some light on the extraordinary result.

Forfeit overview

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Engine                 Games  Forfeit
Rebel-16.2 [t8]         551     3    
Toga4-avx2 [t8]          10     2    
Dragon-2.5-64bit-avx     10     1    
Stockfish_13_win_x64     10     3    
Komodo-14.1-64bit-bm     10     3    
Dragon-64bit-avx2 [t     10     1    
Ethereal-14.00-pext-     10     1    
Stockfish_15_x64_avx     10     3    
Rebel-14.1.02-ChrisW     10     1    
Dragon-2.5-64bit-avx     10     3    
Ethereal-13.00-pext-     10     1    
Sting-sf-28 [t8]         10     1    
Zappa Mexico II x64      10     4    
Komodo-14.1-64bit-bm     10     1    
EngineDeepShredder13     10     7    

Real results, keeping in mind the forfeits, top-19 only because of readability

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No. Engine                                            1     2     3     4     5     6     7     8     9    10    11    12    13    14    15    16    17    18    19 
-------------------------------------------------------------------------------------------------------------------------------------------------------------------
 1 Rebel-16.2 [t8]                                xxxxx   4.5   4.5   4.5   4.5   5.0   5.0   5.5   5.5   6.0   6.0   6.0   6.0   6.5   6.5   6.5   7.0   7.0   7.5
 2 Dragon-2.5-64bit-avx2 [t8]                       5.5 xxxxx   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0
 3 Stockfish_13_win_x64_avx2 [t8, ohne NNUE]        5.5   0.0 xxxxx   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0  
 4 Stockfish_13_win_x64_avx2 [t8]                   5.5   0.0   0.0 xxxxx   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   
 5 Lc0 0.28.2 Nvidia RTX 3060 [752187]              5.5   0.0   0.0   0.0 xxxxx   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   
 6 Stockfish14_x64_avx2 [t8]                        5.0   0.0   0.0   0.0   0.0 xxxxx   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   
 7 Lc0 0.28.0 Nvidia RTX 3060 [j92-100]             5.0   0.0   0.0   0.0   0.0   0.0 xxxxx   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0
 8 Ethereal-14.00-pext-avx2 [t8]                    4.5   0.0   0.0   0.0   0.0   0.0   0.0 xxxxx   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   
 9 Ethereal-13.75-pext-avx2 [t8]                    4.5   0.0   0.0   0.0   0.0   0.0   0.0   0.0 xxxxx   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0  
10 Ethereal-13.50-pext-avx2 [t8, e1350standard      4.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0 xxxxx   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0
11 Slowchess2.8_64-avx2 [t8]                        4.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0 xxxxx   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0 
12 Dragon-64bit-avx2 [t8]                           4.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0 xxxxx   0.0   0.0   0.0   0.0   0.0   0.0   0.0  
13 Stockfish_15_x64_avx2 [t8]                       4.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0 xxxxx   0.0   0.0   0.0   0.0   0.0   0.0  
14 Komodo-14.1-64bit-bmi2 [t8]                      3.5   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0 xxxxx   0.0   0.0   0.0   0.0   0.0  
15 Dragon-2.5-64bit-avx2 [t8, mcts]                 3.5   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0 xxxxx   0.0   0.0   0.0   0.0
16 Ethereal-13.00-pext-avx2 [t8, e13standard]       3.5   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0 xxxxx   0.0   0.0   0.0
17 DeepHiarcs15 [t8]                                3.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0 xxxxx   0.0   0.0
18 Stockfish14_x64_avx2 [t8, no NNUE]               3.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0 xxxxx   0.0
19 Dragon-64bit-avx2 [t8,mcts]                      2.5   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0 xxxxx

[Guenther]

I got the PGN of this tournament and did some research.

Rebel played only 10 games against each of the 55 engines. Meaning, the tournament results rely on previous results looking at the fact all engines played a lot more games than 10, 400-460 actually.

Some statistics that show some light on the extraordinary result.

Forfeit overview

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Engine                 Games  Forfeit
Rebel-16.2 [t8]         551     3    
Toga4-avx2 [t8]          10     2    
Dragon-2.5-64bit-avx     10     1    
Stockfish_13_win_x64     10     3    
Komodo-14.1-64bit-bm     10     3    
Dragon-64bit-avx2 [t     10     1    
Ethereal-14.00-pext-     10     1    
Stockfish_15_x64_avx     10     3    
Rebel-14.1.02-ChrisW     10     1    
Dragon-2.5-64bit-avx     10     3    
Ethereal-13.00-pext-     10     1    
Sting-sf-28 [t8]         10     1    
Zappa Mexico II x64      10     4    
Komodo-14.1-64bit-bm     10     1    
EngineDeepShredder13     10     7    

With a such a number of forfeits this test is for the trash bin...
32 forfeits in 140 games for the opponents above, but only 3 in 551 for Rebel.
Could have been a test from cheesequack.

[Jouni]

Tournament has a lot of very weak engines so best programs got 100% from most matches.

[Paul Bedrey]

Rebel brings back memories of the good old days of Rebel and Rebel Tiger. What fun aggressive engines they were!

Has anyone ever gotten Rebel to work in Arena? If not, any suggestions as to what Chess program to run it in? My laptop runs Stockfish AVX fine in Arena but Rebel justs sits there.

[mclane]

Which hardware (cpu) do you use ?
Rebel works without any problems in arena.
Of course there are several arena versions.

[Rebel]

Rebel brings back memories of the good old days of Rebel and Rebel Tiger. What fun aggressive engines they were!

Has anyone ever gotten Rebel to work in Arena? If not, any suggestions as to what Chess program to run it in? My laptop runs Stockfish AVX fine in Arena but Rebel justs sits there.

From the website -

Rebel 16.2 is only available for PC's with AVX2 support. In general, if your PC is older than 2013 Rebel might not run on your system.

[Werewolf]

While we're on this subject, is there any update on the new CS Tal?

[reflectionofpower]

Congrats to Ed/Chris for this venture. It's wicked fast, and I can finally use it for my own games & analysis. I always loved the old Rebel's and Tal's ways of playing. Combined looks promising. I understand about the Evalcorrect but what is the TC_Aggression parameter as it seems this is a way of increasing aggression too?