Author: Rolf Tueschen
Date: 06:17:36 01/21/03
Go up one level in this thread
On January 21, 2003 at 09:09:49, Ricardo Gibert wrote: >On January 21, 2003 at 08:52:02, Rolf Tueschen wrote: > >>On January 20, 2003 at 23:00:55, Ricardo Gibert wrote: >> >>>On January 20, 2003 at 21:57:38, Robert Hyatt wrote: >>> >>>>On January 20, 2003 at 21:32:22, Ricardo Gibert wrote: >>>> >>>>>On January 20, 2003 at 20:44:21, Robert Hyatt wrote: >>>>> >>> >>>[snip] >>> >>>>>>Round 6 Crafty vs Searcher >>>>>> >>>>>>A near disaster for the first game of the second day. The same d4 opening >>>>>>led to a similar position, but things did not go very well here. First score >>>>>>out of book was -.42, which was typical for every 1. d4 game crafty played as >>>>>>white. But it was able to pull that up quickly normally. 10 moves out of book, >>>>>>the score hadn't changed, showing that searcher was playing very well and with >>>>>>a reasonable amount of understanding of the position. >>>>>> >>>>>>Finally by move 24, Crafty was back to a slightly + score, and this held until >>>>>>it started dropping as it misjudged the queen/rook attacking in the center. At >>>>>>move 32, the score was -.68 after 16 plies. at move 35, the score was -1.5, at >>>>>>move 40 -2.0, -2.5 at move 50, -3 at move 60, and at this point Crafty dug >>>>>>in its heels and pulled the score back to -2.3 where it stayed for a long >>>>>>while. But it slowly traded pawns, and the score started swinting back. By >>>>>>move 80, it was -2.0 again, -1.5 by move 85, -1.0 by move 95, and it finally >>>>>>reported a draw score at move 102. Of all the games it played, this was a >>>>>>really nice effort as it showed a lot of understanding about king rook and pawn >>>>>>endings, something I have worked on a lot over the years. >>>>> >>>>> >>>>>I find your last sentence surprising. Crafty was very lucky in this game that >>>>>Searcherx did not play 62...Re8 62.Kxg3 Rb8 winning easily. >>>>> >>>>> >>>> >>>>Crafty says if you play Re8 it just plays Rb7 immediately, not Kg3. >>>> >>>>Score doesn't change much... >>>> >>>>It may be overlooking something, but it isn't going to let black get >>>>the rook behind the pawn... >>>> >>>>Maybe we are at the wrong move? IE you have two move 62's above. >>>>Do you mean 61. Re8? >>> >>> >>>Yes. 61...Re8 62.Kxg3 Rb8 was my intention. >>> >>> >>>> >>>>Going back to move 61, and playing Re8 Kg3 Rb8 I get Rd4 and Rb4. White >>>>loses one of the pawns on the h file, but only one. It isn't clear to me, >>>>without a lot of study, how black makes progress. The pawn is blockaded, so >>>>the black rook is stuck on the b file unless it gives check. The black >>>>king can't abandon the kingside or white will eat the g pawn and the hpawn >>>>should be enough to force the trade of the rook and a draw... >>> >>>[D]8/1p1R2pk/5p2/7P/7P/5Kn1/4r3/8 b - - 0 60 >>> >>>61...Re8 62.Kxg3 Rb8 63.Rd4 b5 64.Rb4 Kh6 65.Kg4 Rb7 66.Kh3 Kxh5 67.Kg3 g6 >>>68.Kh3 f5 69.Kg3 Rb6 70.Kh3 Rc6 71.Rb3 Rc4 is a prosaic and convincing win. >> >>A comparable position is available with many different continuations. One is >>your 61-Re8 others I pointed out in >>http://www.talkchess.com/forums/1/message.html?278466 >>The point is that you always winn with the f/g free pawns if they are so good >>combined. No need to know the rule of the R behind the pawns because you give >>the b pawn away. >> >>Kind regards, >>Rolf Tueschen >> >> >> > > >Even though it is later given away, it handcuffs the defense giving time to make >preparations before giving up the b-pawn to win on the K-side, so it is still an >important tool. No doubt about it. But I was looking for the programmers and you said yourself that this is difficult to program. So I had a look at totally normal chess, calculable or countable if you like. And this position with the combined pawns is won and that is the whole thing. I meant the argument of the "difficult" Re8-b8 is even not necessary. Rolf Tueschen > >[snip]
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