Author: Howard Exner
Date: 20:05:49 11/16/98
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On November 16, 1998 at 03:23:54, Harald Faber wrote: >Hi Ed, >I am not sure to reach you via e-mail so I write it here too: > >I have seen strange behaviour in Rebel10. I have AMD-K6-200 and Laptop166MMX. In >the same position the AMD has a diiferent best move with a different value than >the 166MMX AT SAME SEARCH DEPTH. How is this possible, any explainations? I'm noticing something similar when even using the same machine with the exact same settings. I tried this with the following position from the BS2830 test suite. r4r1k/pbnq1ppp/np3b2/3p1N2/5B2/2N3PB/PP3P1P/R2QR1K1 w - - id BS2830.EPD; bm Ne4; The settings for Rebel 10 on my K6-233 were AntiGm=Smart, Combination=Off, Selection=N and PlayStyle=N. The method I used was to play the position in infinite mode, force the move after about 60 seconds, record the PV results, takeback the move and then go through the process from the start. For 12 takebacks Rebel 10 played the moves in this order: ST,A,A,ST,A,A,ST,A,ST,ST,A,ST. (ST means that Rebel 10 played the move by setting itself to think in AntiGM=Strong, while A means REbel 10 chose for itself AntiGM=Active). Note that the entire time I am using Anti=GM set to Smart for the entire test procedure. This is definitely not making Rebel 10 deterministic when AntiGM is set to Smart. Does this mean that when AntiGM is set to smart that different test suites will have varying solution times based on what the Smart setting decides among the three Choices of Strong, Active or Smart? My question is why is Rebel 10 chosing different AntiGM settings for completely identical positions with the exact same settings? Should Smart mean the ability to somehow assess the position and then decide on what AntiGM path to follow? For my own testing and playing against Rebel 10 I'm using AntiGM=Strong, Combination=Off, Selection=N (except for some middlegame testing when at times I use Selection = 4), and PlayStyle = Agressive.
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