Author: Michel Langeveld
Date: 14:14:08 01/29/04
Go up one level in this thread
>Bruce writes: > >>The above code would work great if you could be sure that your re-search >>would work. But of course what happened to me is: >> >>1. The search with (alpha, beta) failed high. >>2. The re-search with (beta - 1, INFINITY) failed low. >>3. The re-search with (-INFINITY, alpha + 1) failed high. >>4. And so on, and so on, and so on ..." > >The writings of Dr. Hyatt and Bruce seem to conflict. So what's the true story >here? I have a feeling I'm misunderstanding something. Here is an example of an search instability: searching [88,128] 9 2782 4865370 88 d4e5 h6g4 e5e6 g8h6 e6d7 g4e3 f2e3 e8e3 f1f2 e3d1 c 3d1 f8i8 9* 4856 8888466 88 d4e5 h6g4 e5e6 g8h6 e6d7 g4e3 f2e3 e8e3 f1f2 e3d1 c 3d1 f8i8 research 1 [-412,89] searching [-412,89] 9 5318 9639454 89 d4e5 h6g4 e5e6 g8h6 9* 5318 9639454 89 d4e5 h6g4 e5e6 g8h6 research 2 [-10000,10000] searching [-10000,10000] 9 6642 12006925 35 d4e5 h6g4 e5e6 g8h6 d1d4 e8e6 e1f3 f8g8 d4d5 9* 8511 15653386 35 d4e5 h6g4 e5e6 g8h6 d1d4 e8e6 e1f3 f8g8 d4d5 Nullmove can cause them or the hashtable.
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