Because my modern PC is more or less 6 times faster than an Athlon 1200 in a single thread (equivalent to 40 moves in 19 minutes), I made a tournament between Fruit with reduced time and Stockfish 13, increasing the number of nodes/move of Stockfish. In the end, I’ve chosen Fruit 2.2.1, which 20 years ago, with the old Athlon Thunderbird 1200, got the remarkable score of 2830 Elo, a value similar to the one made by Deep Blue when it beat Kasparov. Moreover, I’ve searched for an engine that was not too strong, easily downloadable from the net, and stable during the matches. In oder to compare the Elo score with a human scale (for example FIDE Scale), or, at least, in order to try to do so, I’ve used the SSDF rating list, which is active for more than 20 years and it is the only I know that made test based on tournament time (40 moves in 120 minutes), with different hardware and with a scale calibrated on hundreds of matches between computer and humans. The graph, made by plotting the number of nodes per move starting from a minimum of 1 up to 256.000.000 (with single core), is the following: (click on the image to open it at full screen): Therefore I’ve started asking myself what the real strenght of the engine would be at different number of nodes for each move, and what is the limit under a normal human will start to have again some chance of winning. The new version is about 30 elo stronger on long time matches, and sits again at the first place in all ratings lists ( CCRL, CEGT, FastGm, in attesa quella di SSDF). With the new Stockfish version just released, the already strongest engine on Earth has raised the bar a bit more higher.
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