Author: blass uri
Date: 07:34:44 04/28/99
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On April 28, 1999 at 06:47:39, Harald Faber wrote: >>There can be a tactical hole that the programs need hours to see and the human >>may miss it if (s)he prefers to check with the computer many positions and >>cannot concentrate with it only at the root of the tree. >> >>Junior4.6 won a correspondence game in the 1/2 final of the correspondence >>championship of Israel because of a tactical mistake of the opponent that >>computers needs a long time to avoid. >> >>The opponent told me that he used a computer to help him. >> >>The opponent is not a weak correspondence player. >>He is playing in the final of a previous correspondence championship of Israel >> >>Uri > >I guess he didn't use the program in an ideal way. To check with computers I >meant to check your favourite lines. Because of horizon and other effects >programs don't find (or need a very long time) deeper tactical solutions. But if >you play [through] your favourite and main lines things suddenly may change. >Especially Genius often needs only one ply to find the idea. That means he may >be at depth 11/23 and sees nothing, if you make the best move, suddenly and MUCH >earlier than in depth 11/23 you see fail low/fail high in Genius analysis. These >things are very dangerous! Here is the position that my opponent did the losing mistake: r4rk1/2p3pp/p7/1p1pq3/8/2P2N2/PPQ2KPP/R1B5 w - - 0 1 (Dark thought is the best program that I know for this position. It found not to play Kg1 in 37 seconds). My opponent played Kg1 and lost after Rxf3 gxf3 Qe1+ Kg2 Re8 Kh3 Re5 I showed this position to some humans and it is not easy to understand what is the threat after Re5. The threat is to play Qg1 with the idea Qg2 Rh5+ Kg3 Qe1+ The main problem for part of the humans to see it is that they do not consider Qe1+ because they think that this move is losing a tempo Qe1 goto g1 and after it back to e1. I also think that a computer may sometimes find better positional moves than the cc player. Sometimes humans have wrong opinions about moves. Uri
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