Author: John Roberts
Date: 05:31:29 01/15/04
Go up one level in this thread
On January 15, 2004 at 07:56:05, Drexel,Michael wrote: >On January 15, 2004 at 07:41:22, Mike Hood wrote: > >>On January 15, 2004 at 04:17:34, Drexel,Michael wrote: >> >>>On January 14, 2004 at 18:57:50, Mike Hood wrote: >>> >>>>On January 14, 2004 at 16:08:24, David H. McClain wrote: >>>> >>>>>On January 14, 2004 at 15:07:39, Chris Taylor wrote: >>>>> >>>>>>Does S8 know how to use the 6 piece egtbs'? I could wait for it to arrive, nah; >>>>>>please tell me! I have ordered the dam things and would like to know if I have >>>>>>wasted my GBPs. >>>>>> >>>>>> >>>>>>Chris >>>>> >>>>>Chris, >>>>> >>>>>Being an amatuer here perhaps I am making an incorrect assumption about this. >>>>> >>>>>When I use my Shredder 7.04 the heavy hard drive activity appears to indicate it >>>>>is accessing EGTBs tablebases when there are six pieces left on the board. I >>>>>have assumed all along that this indicates that Shredder 7.04 is using a few of >>>>>my 6 piece EGTBs or is at least looking for them. Shredder Classic GUI also >>>>>states "6 piece EGTBs found" when changing hash table size for them. >>>>> >>>>>Hopefully one of our experts on this can either confirm or refute this. If this >>>>>is in fact true then I see no reason why S 8 would not do the same. >>>>> >>>>>DHM >>>> >>>>The disk activity (and the "tb=" info in the engine window) when 6 pieces are on >>>>the board doesn't necessarily mean that Shredder 7 is accessing a 6-piece >>>>tablebase. It might only be accessing 5-piece tablebases in a search line which >>>>results in the capture of one of the pieces. >>>> >>>>As far as I know, Shredder 7 accesses the single part 6-piece tablebases, ie the >>>>tablebases that don't have a digit in the filename. The only programs that I >>>>know that access the multi-part 6-piece tablebases are Hiarcs 9 and Crafty. I >>>>assume that Shredder 8 can be added to this list. Ask me again next week. >>> >>>You can add Fritz 7 and Fritz 8 to that list. >>> >>>Michael >> >>Sorry, Michael, you're wrong. > >No, I am right. Both Fritz 7 and Fritz 8 use them in the search. > >New game >3kr3/8/8/8/8/3p4/2PP4/2RK4 w - - 0 1 > >Analysis by Fritz 7: > >1. = (0.00): 1.Ta1 dxc2+ 2.Kxc2 Te2 3.Ta7 Te1 >2. = (0.00): 1.Tb1 dxc2+ 2.Kxc2 Te2 >3. = (0.00): 1.cxd3 Te5 2.d4 Td5 >4. -+ (-#28): 1.c3 Th8 2.Ke1 >5. -+ (-#21): 1.c4 Tg8 2.Ke1 > > >New game >3kr3/8/8/8/8/3p4/2PP4/2RK4 w - - 0 1 > >Analysis by Fritz 8: > >1. = (0.00): 1.cxd3 Kd7 >2. = (0.00): 1.Ta1 dxc2+ 2.Kxc2 >3. = (0.00): 1.Tb1 dxc2+ 2.Kxc2 >4. -+ (-#27): 1.c3 Tg8 2.Ke1 Tg1+ 3.Kf2 Txc1 4.Ke3 Te1+ 5.Kd4 Te2 6.Kxd3 >5. -+ (-#21): 1.c4 Th8 2.Ke1 Th1+ 3.Kf2 Txc1 4.Ke3 Txc4 5.Kxd3 Tc1 6.Kd4 > > >This is what you get if an engine does not use them: > >New game >3kr3/8/8/8/8/3p4/2PP4/2RK4 w - - 0 1 > >Analysis by Fritz 6: > >1. ± (1.38): 1.cxd3 Kd7 2.Tc5 Kd6 3.Ta5 Kc6 4.d4 Te4 5.d5+ Kb6 >2. = (0.00): 1.Tb1 dxc2+ 2.Kxc2 >3. = (0.00): 1.Ta1 dxc2+ 2.Kxc2 >4. -+ (-#27): 1.c3 Th8 2.Ke1 Th1+ 3.Kf2 Txc1 4.Ke3 Te1+ 5.Kd4 Te2 >5. -+ (-#21): 1.c4 Th8 2.Ke1 Th1+ 3.Kf2 Txc1 4.Ke3 Txc4 > >Michael Am I correct in understanding that your displays show 5 candidates analyzed simultaneously? Are you sure this is what you want to show us? How about one candidate, watching for the "tb=x" display? I'm new, why is this position so good to prove anything, aside from the early disappearance of the 6th piece?
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