Author: blass uri
Date: 07:56:20 08/21/99
Go up one level in this thread
On August 21, 1999 at 10:34:05, odell hall wrote: >On August 21, 1999 at 09:20:34, blass uri wrote: > >> >>On August 21, 1999 at 08:10:55, odell hall wrote: >> >>>On August 21, 1999 at 08:04:43, odell hall wrote: >>> >>>>On August 21, 1999 at 06:43:55, blass uri wrote: >>>> >>>>> >>>>>On August 21, 1999 at 05:08:58, odell hall wrote: >>>>> >>>>>>Hi >>>>>> >>>>>> >>>>>> So far only Fritz5.32 can solve this position, I am not letting my programs >>>>>>think more than five minutes. Fritz 5.32 AMD-k2II 350 45mb for fritz solves in >>>>>>47sec!!! >>>>>> >>>>>>2n1r1k1/2p1q2p/3pN1p1/3Pp1N1/3bP3/5Q2/2r3PP/R4R1K w - - id Bart - Towerking; bm >>>>>>g5h7; >>>>> >>>>>I think that there are many solutions to the problem and g5h7 is not the only >>>>>winning move so it is not a good problem. >>>> >>>> >>>> >>>>Ok uri come on icc and i will beat any program you have with Nxh7 just to prove >>>>that it is the winning move. The next best move is Ra3 which is slightly >>>>inferior. But nxh7!! is definetely the best move! without question. >>>>> >>>>>Can Fritz5.32 defend this position with black against the program that do not >>>>>find g5h7? >>>>> >>>>>Uri >>> >>> >>>I am defining the Best move as the move which leads to the greatest loss of >>>material for the opposing side. Just because fritz can not defend the position >>>against a program that does not play nxh7 does mean that Nxh7 is not the best >>>move. Maybe you can explain your logic to me. No one said that there was not >>>many good moves in the position, only that Nxh7 is that best. >> >>My logic is that if there is more than 1 winning move then it is not a good >>problem. >> >>My version of Junior after some hours want to play Rab1 with 2.49 pawns >>advantage for white(1.Rab1 h5 2.Qf7+ Qxf7 3.Rxf7 Rf2 4.Rxc7 Bb6 5.Rg7+ Kh8 >>6.Nf7+ Rxf7 7.Rxf7... is the main line) >> >>Uri > > >I bet if you feed Nxh7 into junior and then let it think, it will see that this >move is stronger I am not sure about it. I gave it more than 10 minutes for the position after Nxh7 and the evaluation was only 1.74 pawns for white. I can prove by a tree that the evaluation is bigger than 3 pawns but the same may hold for Rab1. I agree that 1.Nxh7 Kxh7 2.Ra3 Rf2 3.Rxf2 Bxf2 4.Qxf2 Nb6 5.Rh3+ Kg8 6.Rh6 is winning for white and that black has no good alternative. I gave the initial position to my Fritz5 engine and with 64M hash tables it found Nxh7 at depth 11 only to go back to Rab1 at depth 12 and with 128M hash it did not find Nxh7 and prefered Rab1 at depth 11 and 12. I have not Fritz5.32 but maybe it can also change its mind to Rab1 if it get more time or more hash tables. Uri
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