Author: Roy Eassa
Date: 10:10:42 12/20/02
Go up one level in this thread
On December 20, 2002 at 12:48:46, John Merlino wrote: >On December 19, 2002 at 19:39:56, Roy Eassa wrote: > >>White to move & win >>[d] 7k/5r2/6PK/6P1/8/8/5P1R/8 w - - 0 1 >> >>7k/5r2/6PK/6P1/8/8/5P1R/8 w - - 0 1 >> >>1.g7+! >> >> [1.Kh5 Rf4 only draws] >> >>1...Kg8 >> >> [1...Rxg7 2.Rh5 Kg8 >> (2...Rf7 3.Kg6+ Kg8 4.Rh8+ +-) >> 3.g6 Rd7 4.Ra5 +-] >> >>2.Rh3! Rf3 3.Rg3! Rxf2 >> >> [3...Rf4 4.Re3 Rh4+ 5.Kg6 Re4 6.Kf5 Rc4 7.Re7 +-] >> >>4.Ra3 Rh2+ 5.Kg6 Ra2 6.Rf3 Ra6+ 7.Rf6 Rb6 8.Kh6! Rb8 9.Rf8+ +- >> >> [9.g6 also works] > >CM9000, on a P3-733, finds g7+ in one second, but loses it to Kh5 up until nine >seconds, after which it finds and sticks with g7+: > >Time Depth Score Positions Moves >2:34 14/18 3.12 20784755 1.g7+ Kg8 2.Rh3 Rd7 3.Rf3 Rxg7 > 4.g6 Rd7 5.Rc3 Rd8 6.f4 Re8 7.f5 > Rd8 8.f6 Kf8 9.Rg3 Rd7 10.Rg4 > >jm I don't think the first move is the only issue here. I think it's important to see at least the first 5 ply, because it represents some very clever defense by Black and some additional critical but hard-to-find moves by White. Anything less does not demonstrate understanding of the (only) way to win the game from the starting position. As is often the case, many programs might select the correct first move for the wrong reason. With this problem I think seeing the first 5 ply may be enough; for some other positions the programs must see even further to prove that they "understand" what's going on. How long before your program shows this as the PV? : 1.g7+ Kg8 2.Rh3 Rf3 3.Rg3
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