Author: Howard Exner
Date: 09:37:49 09/01/98
Go up one level in this thread
On September 01, 1998 at 10:33:07, Amir Ban wrote: >On September 01, 1998 at 10:10:15, blass uri wrote: > >> >>On September 01, 1998 at 08:42:30, Amir Ban wrote: >> >>>On September 01, 1998 at 07:17:44, Howard Exner wrote: >>> >>> >>>>5. Rebel missed a chance to immediately transpose to a won ending with >>>>the moves 1. Qxe6+ Qxe6 2. Rxe6 Kxe6. Black's passed d pawn can be >>>>easily stopped while white's pawns are unstoppable. Instead Rebel played >>>>the liguidating sequence 1. Qb7+ Kd4 2. Qb6+ Kd3 3. Qxe3+ Rxe3 4. Rxe3 Kxe3. >>>>Note the better location now of black's king. Black should be able to draw this >>>>now by advancing his d pawn. >>>>4R3/5Q2/3pr3/p2k1p2/5P2/1P2q1PP/P6K/8 w - - id "Rebel 9.0 - Hiarcs 6.0"; am >>>>Qb7+; >>>> >>> >>>This is wrong. Qb7+ is the right move, and it wins a rook: >>> >>>1.Qb7+ Kd4 2.Qb6+ Kd3 3.Qb5+ Kc2 4.Qc4+ or 3...Kd2 Qd5+. >>> >>>How did Rebel manage to miss this ? >> >>I think that Rebel did not miss it because Rebel's line is also winning. >>and Rebel prefered to win in a pawn endgame >> > >??? > >This pawn endgame is not won. Both sides queen, and what happens then is not >clear. To prefer an unclear queen endgame over a simple win of a rook sounds a >bit over-sophisticated to me. > >Besides, I guess Rebel didn't win this, otherwise why would Howard mention this >position ? I still get some sort of perverse pleasure when I see these very strong programs make mistakes. This games illustrates that both sides are capable of blunders. Rebel should have won easily by either the Qb7 line that follows up with the win of a rook (as pointed out by Amir) or by the simple liquidating sequence that I first pointed out. It's a matter of tatse which route to take. There could be other winning lines also. The route chosen by Rebel should not have won except that Hiarcs also blundered by allowing a simple pawn ending victory for Rebel.(That is the next position in this suite - am Kxf4).
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.