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Unfortunately, I'm currently on vacation with no access to a good computer. If we want to collect 10 draws to fight small number statistics, that's worth 15 days of compute. We expect to play for at most 2199 games (worth 36 hours) until the first draw occurs. With time controls of 30s, a game takes about a minute.
![stockfish chess old downloads stockfish chess old downloads](https://www.techyv.com/sites/default/users/Images-Folder/Stockfish-9-1024x768.jpg)
So, let's keep the time controls to something sensible, at least at Blitz level for SF. OK, can't we just make SF run slower until it is more equal? Sure, we can do that, but that's a different experiment: The one of my previous post. Measuring the gap costs a lot of compute, because many games need to be played. Of course, Rebel 6 will have more than 2415 ELO when running on a modern machine - that's what we want to measure. That's a difference of 1129 ELO, with expectations to draw only one game in 2199 and lose the rest. Rebel 6.0 has ELO 2415 on a P90, Stockfish 13 is 3544 (SF14 is not in that list yet). So it appears that Rebel is worse, but by how much? You can't tell if it loses almost every game. The result after 1,000 matches? Stockfish won all of them. Now, let's go! Problem 3: Measuring the quality of a player that losses every single game So, we need to give it 1000ms of slack with "timemargin=1000". If we would ignore the fact, it would simply lose due to time control violations. That amount would have been possible on old machines (486 era), although it would have been not common.įor Rebel 6, the interface runs through an adaptor, which takes time. Stockfish is typically run at its default of 128 MB. So, we can test RAM settings between 2 MB and 512 MB for the old engine. The "wX" parameter sets hash/RAM: w0=2 MB, w1=4 MB. Instead, they must be defined in its config file wb2uci.eng: Ponder = false However, Rebel does not accept these settings through the UCI interface. One can define hash (RAM), pondering, and other settings through UCI in cutechess.
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We can download Rebel 6 and set up cutechess like so: cutechess-cli The following experiments should be possible with any of these.
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I believe that old Rebel makes for a similarly good comparison as old Fritz.Ī series of other old engines that support UCI are available for download. It was converted to UCI by its author Ed Schröder. For example, it won the WCCC 1992 in Madrid. Rebel was amongst the strongest engines between 19. I was then adviced by Stefan Pohl to try Rebel 6.0 instead. Earlier versions used a proprietary interface (to connect to its GUI and to ChessBase), for which I found no converter. So with that we can go back 20 years, but no more. The problem is that it only supports today's standard interface, UCI, since version 7 from the year 2001. Paul and I independently favored the program Fritz from the most famous chess year 1997, because it was at the time well respected, had seen serious development effort over many years, and won competitions. Problem 1: Find an old engine with a working interface The standard tool to compare chess engines is the command-line interface cutechess-cli. In principle, the experiment should be trivial. The right person to contact would be Lars Sandin.īut the devil is in the details. They may be able to transplant an old version onto a new machine for cross-calibration. It covers 155,019 games played by 397 computers, going back to 2 MHz machines from the year 1984. I can also imagine that the Swedish Chess Computer Association is able to perform the test directly, using their Rating List procedure.
![stockfish chess old downloads stockfish chess old downloads](https://images.chesscomfiles.com/uploads/v1/news/718612.301b2dcc.300x169o.fbb1cc0fd988.png)
![stockfish chess old downloads stockfish chess old downloads](http://rebel13.nl/____impro/1/onewebmedia/cm6.jpg)
The time controls are 2min+1s per move, i.e. It is run on an i7-4770k at 9.2 MNodes/s. Through an online search, I found the CCRL Blitz Rating list. Paul Christiano asked for the case of an old engine running on modern hardware. I previously explored the performance of a modern chess engine on old hardware ( 1, 2).