Author: Howard Exner
Date: 03:48:00 06/04/99
Go up one level in this thread
On June 04, 1999 at 03:22:39, blass uri wrote: > >On June 03, 1999 at 22:59:50, Howard Exner wrote: > >>On June 03, 1999 at 01:51:04, blass uri wrote: >> >>>2R5/p3k3/1p2qrpp/1P2Q3/8/4PP1P/5K2/8 w - - 0 1 >>> >>>This position is from the ssdf games >>> >>>Junior5(P200) did a mistake 62.Qb8 and Rebel8(P90) forced a perpetual check by >>>Rxf3+ 63.Kxf3 Qxh3+ 64.Kf2 Qf5+ 65.Ke1 Qb1+ 66.Kd2 Qb2+ 67.Kd1 Qb1+ 68.Ke2 >>>Qxb5+ 69.Kd2 Qb4+ 70.Kd3 Qb3+ 71.Ke4(The evaluation of Junior when it played >>>71.Ke4 is 0.00 and Fritz can see the perpetual even earlier but not at move 62) >>> >>>I think that white has good chances to win after 62.Rc7+ with trading queens >>>instead of 62.Qb8 >>> >>>Can a program find 62.Qb8 or find a better defence for white to prevent the >>>perpetual check? >>> >>>I think that it is a perpetual but I was too lazy to do a table of positions >>>that white cannot escape from them without losing the rook or the queen. >>> >>>Uri >> >>As always I enjoyed playing over the position you posted. As a player of the >>white side I probably would have played Rc7+ followed by exchanging the Queens. >>1. Rc7+ Kf8 2. Qxe6 Rxe6 3. f4. >> >>Here I would cross my fingers and hope that my opponent would play Re7. >>Because the white b pawn holds back the two black pawns exchanging rooks on e7 >>would be a simple win for white. Black would have to try and hang on with >>some other move like Re4, Rf6 or g5 (I don't know exactly where these 3 moves >>would lead to but they seem better than Re7?). Rook endings are tough to grind >>out a win but leaving the Queens on always permits the drawing with perpetual >>check as you have pointed out. >> >>Here is the epd for black to play and avoid Re7. >> >>5k2/p1R5/1p2r1pp/1P6/5P2/4P2P/5K2/8 b - - >> >>What do computers do here? I know that sometimes these transitions to >>King/pawn endings are problematic for computers. > >Junior5.4 found Re4 in less than 30 seconds on my pentium200 > >After Re4 Rxa7 Rb4 black gets the pawn back. > >I think that after 1.Rc7+ Kf8 the right move is not Qxe6 and it is better to >keep the queens on the board. In this position I think you are correct. I'm so used to OTB against computers that I usually become intimidated when the the position is open and Queens are on the board. White can continue to apply pressure. > >Junior wants to play 2.Qb2 in this line when Rxf3+ 3.Kxf3 Qxh3+ 4.Kf4 Qf5+ >5.Kg3 Qg5+ 6.Kh2 Qh4+ 7.Kg2 Qe4+ 8.Kg1 Qxe3+ 9.Qf2+ is not good for black >f8 is a bad square for the balck king because of the ideas of Qf2+ or Qf1+ > >Uri
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