Author: blass uri
Date: 12:24:14 06/04/99
Go up one level in this thread
On June 04, 1999 at 13:34:16, Dann Corbit wrote: >On June 04, 1999 at 04:27:15, blass uri wrote: >>On June 03, 1999 at 17:03:08, blass uri wrote: >>>6k1/r6p/4PQp1/8/5PP1/4K2P/8/r7 b - - 0 1 >>> >>>This position(from Shep's games) is a simple draw by perpetual check. >>> >>>The last move of white (Hiarcs7) was e6 and it could not see the simple >>>perpetual check. >>> >>>I know that some other programs also fail to see this simple tactics. >>> >>>How much time do your program need to give the position evaluation of 0.00? >>> >>>Uri >> >>Programs need to see more than 60 plies to see the repetition and this example >>proves that seeing more than 60 plies forward may be practically important in >>chess. >> >>Humans have no problem to see more than 60 plies forward and only computers have >>this problem. >With 11 pawns+pieces still on the board, there is no program that will find >this, I think. 60 plies forward is a big chore for me. If you can do it with >no problem, then I don't want to have to play you! Usually in games I cannot see 60 plies forward but this is a simple case because the white king can visit 30 squares possible line that I can see is R7a3+(The only logical check,otherwise the king is going to escape to h4) Kf2 R1a2+(again the only logical check) Kg1 Ra1+ Kh2 Ra2+ Kh1 Ra1+ Kg2 R1a2+ Kf1 Ra1+ Ke2 R3a2+(black must play with R3 in this move or later otherwise white is going to play with the king to b1) and now the king go to the squares d3,e4,e5,d6,e7,e8,d7,d8,c7,b8,b7,b6,b5,b4,b3,c2,c3,c4,c5,c6,d5,d4,d5 and black do checks with the rook that is not at a1. Uri
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