Author: Danniel Corbit
Date: 20:35:35 07/29/98
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On July 29, 1998 at 18:54:35, Robert Hyatt wrote: [snip] >Here I have some data. In the "Crafty goes Deep" experiment last year, we ran >such a test with Crafty, searching 347 different positions to depth=15. We >were interested in how often does one more ply produce a different move. The >result? Somewhere in the 20% range which was surprising. In fact, within close >limits, adding one ply changed the PV about 20% of the time no matter whether it >was going from ply 6 to ply 7, or ply 14 to 15. The JICCA has the exact >results, while the raw search output is on my ftp machine... My original question was if such analysis will choose a move that was not considered in the top 3 previously. My position is that from a given starting point, a ways into the game, there are not dozens of good moves, but only two or three. The opinion about which one is best will waffle, but I doubt if a completely new replacement is found often. If we take the 20% figure, that means one in 5 times, a new move is chosen. But was that move 2% improved over the previous ply, to barely edge out the previous champion? I do not believe that there are more than just a few good alternatives, on average. I'm probably just stubborn. In other words, does an additional ply tend to promote a move that was a dog before? I simply don't believe it. Except on very rare occasions.
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