Author: Howard Exner
Date: 22:01:56 10/13/99
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On October 13, 1999 at 21:46:31, Steve Schooler wrote: >On October 13, 1999 at 21:39:33, Steve Schooler wrote: > >>On October 13, 1999 at 19:49:58, Jeremiah Penery wrote: >> >>>On October 13, 1999 at 17:23:14, Howard Exner wrote: >>> >>>>Here's an example of pawn majority knowledge. A program >>>>with pawn majority knowledge of the queen side configuration in this >>>>example may well find the winning move Qg6+. >>>> >>>>4Q3/6pk/2pq4/3p4/1p1P3p/1P1K1P2/1PP3P1/8 b - - bm Qg6; >>>> >>>>After the exchange of queens will follow the the advance of the black king to >>>>the kingside, then exchanges of the kingside pawns, and finally the king can >>>>march over to pick up the queenside pawns. Is knowledge that white cannot break >>>>through on the queenside essential for solving this? Would any program find Qg6? >>> >>>I think Qg6 only draws. >>> >>>Here's a line: 1. ...Qg6 2. Qxg6 Kxg6 3. Ke3 Kf5 4. c3 g5 5. Ke2 Kf4 6. Kf2 g4 >>>7. fxg4 Kxg4, and this will draw. >>> >>>Can black improve on this? >>> >>>Jeremiah >> >>I suspect that black may win by zugzwang : in above line >> >>4... Kg5 5. Ke2 Kf4 6. Kf2 g6 7. cxb4 g5 8. Kg1 Kg3 9. Kh1 h3 >>10. gxh3 Kxh3 and (I think) black wins. > >In above line, from my previous post, I overlooked 8. b5. I now suspect that >White can draw. This is on the right track, just keep playing it through. 1... Qg6+ 2. Qxg6+ Kxg6 3. Ke3 Kf5 4. c3 Kg5 5. Ke2 Kf4 6. Kf2 g6 7. cxb4 g5 8. b5 cxb5 9. b4 g4 10. fxg4 Kxg4 11. b3 Kf4 12. Kf1 I guess this position carries a bit of venom for programs. A. Programs are intimidated by the greater number of pawns for white on the queenside, thus the reluctance to exchange Queens. Yet in this similar position they may very well play Qg6. 4Q3/6pk/2pq4/3p4/1p1P3p/1P1K1P2/2P3P1/8 b - - id Pos 1 - EXAMPLE.EPD; bm Qg6; It is different only in that the white pawn on b2 is missing. Both are similar in that white cannot break through and force a passer though with the extra b2 pawn white has some waiting moves that do not help since no passer is available. B. The waiting move with the king 4 ...Kg5, compelling white to move. C. The liquidation theme, where after black exchanges the kingside pawns the king is so dominant that it can move uncontested to the queenside. I posted this one about a year ago but no one posted that their program found Qg6 back then.
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