Author: John Merlino
Date: 12:44:46 02/25/01
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On February 25, 2001 at 13:46:32, Sune Larsson wrote: > > [D]8/5p1k/r5pp/P7/3R3P/6P1/5PK1/8 w - - 0 1 > > > 1927 Alekhine won the 34th game in the battle vs Capablanca to become > World Champion. He did it by playing 1.Ra4! in the above position. > Black's rook has to block the pawn and white has at his disposal an > endless reserve of rook moves along the a-file. Again, the future for > black spells "Zugzwang". The general rule is that a passed pawn should > be supported by a rook from the rear. That's why ideas of 1.Rd5? are > wrong. This is a knowledge that have to be implemented in many chessprograms. > I have seen numerous examples of trying to support such a pawn sideways. > > What would your favourite program play? > > Sune CM8000 plays Ra4 all the way: Time Depth Score Positions Moves 0:00 6/7 1.13 31872 1. Ra4 Kg7 2. Kf3 Kf6 3. Ke4 Ke6 4. Kd4 0:00 7/8 1.19 100695 1. Ra4 Kg7 2. Kf3 Kf6 3. Ke4 Ke6 4. Kd4 Kd6 0:02 8/9 1.14 296579 1. Ra4 Kg7 2. Kf3 Kf6 3. Ke4 Ke6 4. g4 f6 5. f4 0:07 9/10 1.19 1025675 1. Ra4 Kg7 2. Kf3 Kf6 3. Ke4 Ke6 4. Kd4 f6 5. f3 Kd6 0:22 10/11 1.18 2885578 1. Ra4 Kg7 2. Kf3 Kf6 3. Ke4 Ke6 4. Kd4 Kd6 5. g4 Kc6 6. f4 Kb5 1:19 11/12 1.26 10117372 1. Ra4 Kg7 2. Kf3 Kf6 3. Ke4 Ke6 4. Kd4 Kd6 5. Kc4 Kc6 6. Kb4 f5 jm
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