Author: Roy Eassa
Date: 10:13:27 12/20/02
Go up one level in this thread
On December 20, 2002 at 04:24:35, Richard Pijl 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] > >1.g7+ is found by the Baron on slow hardware (PII-500) in a few seconds and with >a large score: > > ply time nodes score pv > > 19(31). 520 80021040 551 g6g7 h8g8 h2h3 f7f4 h3e3 f4h4 h6g6 h4e4 g6f5 >e4d4 e3e7 g8h7 f2f4 d4d6 f5e5 d6g6 f4f5 g6g5 e5f4 I don't think that it sees the best defense for Black. IMHO it's important to see at least the first 5 ply of the solution in this case, 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, against stiff defense. As is often the case, many programs might select the correct first move or two 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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