The slowdown with Stockfish 5 (recent development versions) is *not* minimal when analyzing certain chess positions for several hours or days in infinite analysis mode, which is the only way I use these chess engines. I don't like to be argumentative (keep going in circles), but will try to state it a bit differently. It needs to be much more exponential(!), not so linear. Ronald de Man (or somebody) needs to make Stockfish's syzygy probe depth scaling similar to Komodo. In other words they're about a power of 2 apart. Of course the default setting of 1 works OK - gives high hits in early endgames, and occasional hits in opening positions.Īt present a syzygy probe depth setting of 100 for Stockfish 5 is approximately the same as a setting of 10 for Komodo 8. It becomes impossible for users to tweak that setting to find the "sweet spot" for a particular situation on the chessboard. In simple endgames the number of hits grows too large and kn/s speed suffers, even using a SSD. It's reduced somewhat, apparently in linear fashion, but not enough. Unfortunately it doesn't work that way with Stockfish 5 (latest development versions) at the high end of the scale!? Setting probe depth to 99 doesn't cut off or reduce the tablebase hits significantly in typical early endgame positions. The default setting of 2 gives high hits in early endgames, and occasional hits even in opening positions. A setting of about 10 starts giving fairly high hits in this situation with Komodo. I must reduce the setting to about 25 to start seeing significant tablebase hits in typical early endgames. ![]() Setting probe depth to 99 results in no tablebase hits whatsoever in my simple tests with early endgame positions. ![]() I believe that with correct scaling, setting probe depth to the maximum (99-100) should cut off tablebase access completely, or slow it down to just a very few hits. That's almost the same range but they behave very differently. Komodo 8 has a probe depth scale of 1-99. I wasn't aware of a problem with Stockfish until I tried some other engines with the 6-piece syzygy tablebases.įor example Stockfish 5 (development versions) has a syzygy probe depth scale of 1-100.
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