Author: John Merlino
Date: 11:49:35 03/04/01
Go up one level in this thread
On March 04, 2001 at 12:05:53, Sune Larsson wrote: > > [D]8/1p6/p4p1p/2p1P2k/5P2/6pP/1P4P1/6K1 w - - 0 1 > > Badai, 1962 > > A clean cut pawn ending this time, 5 versus 6 pawns. But white > to move and win. This is a rare flower and not a normal ending. > A Swedish IM once told me that he had studied and learned all > there is about pawn endings. And that he now *knew* them all. > As in the stories he then went out to play an important team match, > faced a complicated (right!) pawn ending - and lost it. They can > be real tricky. This one is about taking squares instead of pawns - > taking space instead of material. Mind you - a pawn down in a normal > ending is mostly a loss. And here white moves for the win. > The solution is further down. > > Test: White to move and win. 1) Can your program find the win? > 2) How much time needed? > > Sune > > > > > > > > > > > > >Badai,B >Shajmati, 1962 > >1.f5 fxe5 2.h4 c4 3.Kf1 a5 4.Ke2 a4 [4...e4 5.Ke3 a4 6.Kf4 c3 7.Kxg3 c2 8.Kh3 >c1Q 9.g4#] 5.Kf3 c3 [5...Kxh4 6.f6] 6.Kxg3 cxb2 7.Kh3 b1Q 8.g4# 1-0 Changing selective search to 12, CM8000 finds it in just OVER 5 minutes on a P3-800: Time Depth Score Positions Moves 0:00 1/5 -1.01 803 1. e6 Kg6 2. f5+ Kg7 3. Kf1 Kf8 4. Ke2 0:00 1/6 -1.34 1577 1. e6 Kg6 2. f5+ Kg7 3. Kf1 Kf8 4. Ke2 Ke7 0:00 1/7 -1.20 3575 1. e6 Kg6 2. f5+ Kg7 3. Kf1 Kf8 4. Ke2 Ke7 5. Ke3 0:00 1/8 -1.27 5468 1. e6 Kg6 2. f5+ Kg7 3. Kf1 Kf8 4. Ke2 Ke7 5. Ke3 b5 0:00 2/9 -0.78 9046 1. e6 Kg6 2. f5+ Kg7 3. Kf1 Kf8 4. Ke2 h5 5. Kf3 h4 6. Ke4 0:00 3/10 -1.06 12543 1. e6 Kg6 2. f5+ Kg7 3. Kf1 Kf8 4. Ke2 h5 5. Kf3 h4 6. Kg4 0:00 4/11 -0.79 19404 1. e6 Kg6 2. f5+ Kg7 3. Kf1 c4 4. Ke2 a5 5. Ke3 Kf8 6. Kd4 b5 7. Kd5 0:00 5/12 -0.95 31677 1. e6 Kg6 2. f5+ Kg7 3. Kf1 c4 4. Ke2 a5 5. Ke3 Kf8 6. Kd4 b5 7. Kc5 0:00 6/13 -1.15 51787 1. e6 Kg6 2. f5+ Kg7 3. Kf1 c4 4. Ke2 Kf8 5. Kf3 a5 6. Ke4 Ke7 7. Kd5 b5 0:00 7/14 -1.21 84838 1. e6 Kg6 2. f5+ Kg7 3. Kf1 c4 4. Ke2 Kf8 5. Kf3 a5 6. Ke4 Ke7 7. Kd4 b5 8. Kd5 0:01 8/15 -0.62 176599 1. e6 Kg6 2. f5+ Kg7 3. Kf1 c4 4. Ke2 Kf8 5. Ke3 Ke7 6. Kd4 b5 7. Kd5 h5 8. Kc6 Ke8 9. Kd6 0:02 9/16 -1.10 315872 1. e6 Kg6 2. f5+ Kg7 3. Kf1 Kf8 4. Ke2 Ke7 5. Ke3 Kd6 6. h4 c4 7. Kd4 b5 8. h5 Ke7 9. Kd5 a5 0:05 10/17 -1.10 703272 1. e6 Kg6 2. f5+ Kg7 3. Kf1 Kf8 4. Ke2 Ke7 5. Ke3 Kd6 6. h4 c4 7. Kd4 b5 8. h5 Ke7 9. Kd5 a5 0:12 11/18 -1.33 1647295 1. e6 Kg6 2. f5+ Kg7 3. Kf1 Kf8 4. Ke2 a5 5. Ke3 b5 6. Ke4 a4 7. Kd5 c4 8. Kd4 Ke7 9. h4 h5 10. Kd5 0:27 12/19 -1.40 3574924 1. e6 Kg6 2. f5+ Kg7 3. Kf1 a5 4. Ke2 b5 5. Ke3 a4 6. Kd3 Kf8 7. h4 Ke7 8. Kc3 h5 9. Kd3 b4 10. Ke4 c4 11. Kd4 0:55 13/20 -1.44 7087830 1. e6 Kg6 2. f5+ Kg7 3. Kf1 a5 4. Ke2 b5 5. Ke3 a4 6. Kd3 Kf8 7. h4 Ke7 8. h5 Kf8 9. Kc3 b4+ 10. Kc4 a3 11. bxa3 bxa3 12. Kb3 5:28 13/20 1.72 39256490 1. f5 fxe5 2. h4 c4 3. Kf1 b5 4. Ke2 e4 5. Ke3 b4 6. Kxe4 a5 7. Kf3 Kxh4 8. f6 c3 9. bxc3 bxc3 10. Ke2 Kg5 11. f7 c2 12. Kd2 7:34 14/21 2.51 55275643 1. f5 fxe5 2. h4 c4 3. Kf1 c3 4. bxc3 e4 5. Ke2 e3 6. Kxe3 a5 7. Kd4 a4 8. Kc4 a3 9. Kb3 b6 10. Kxa3 b5 11. Kb4 jm
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