Author: John Merlino
Date: 12:31:29 03/09/01
Go up one level in this thread
On March 09, 2001 at 08:08:01, Sune Larsson wrote: > > [D]8/6b1/4k2p/p1p1p1p1/2P1K1P1/PP3N1P/8/8 w - - 0 1 > > Cortlever, 1940 > > Knight vs bishop and 5 pawns each. The black pawns are tied to squares > of the same color as the bishop. This is the classic "bad bishop" and > the position is won for white. But how to do it? Putting the knight > on f5 and then create Zugzwang for black with a4, doesn't seem enough > for a win... > > > Test: Can your program win this position, playing white? > The solution, with lines by the author, further down. > > > Sune > > > > > > > > > >Cortlever,N >1940 > >1.h4! > >[1.Ne1? Bf8 2.Nd3 Bd6 3.a4 Bf8 4.Nxe5 Bd6; >1.Nd2 Bf8 2.Nf1 Bd6 3.Ng3 Be7 4.Nf5 Bf8 5.a4 Bd6! 6.Nxd6 (6.Nxh6 Be7) 6...Kxd6 >7.Kf5 e4 8.Kxe4 Ke6] > >1...gxh4 2.Nxh4 Bf8 3.Nf3 Bd6 4.Ne1 Kf6 > >[4...Bf8 5.Nd3 Bd6 6.a4 Bf8 7.Nxe5 Bd6 8.Nd3 Bf8 (8...Be7 9.Nf4+ Kf6 10.Nd5+) >9.Nf4+ Kf6 10.Kd5 Kg5 11.Ne6+] > >5.Kd5 Bb8 6.Kxc5 Kg5 7.Kd5 Kxg4 > >[7...Kf4 8.Nd3+ Kxg4 9.Nxe5+] > >8.Ke4 Bd6 > >[8...h5 9.b4 axb4 10.axb4 h4 11.c5 Ba7 12.Nf3] > >9.Nc2 h5 10.b4 axb4 11.axb4 h4 12.Ne3+ Kg3 13.c5 1-0 CM8000 sees Ne1 as a good move for White (and you'll notice it believes 1...Bf6 is the right response, rather than 1...Bf8), but it is doing exactly what you say is not "enough" -- putting the Knight on e5, and following with a4: Time Depth Score Positions Moves 0:00 6/7 0.62 15714 1. Ne1 Bf8 2. Ng2 Bd6 3. Ne3 Bc7 4. Nf5 0:00 8/9 0.69 62850 1. Ne1 Bf6 2. Nd3 Kd6 3. Kf5 Bg7 4. Nf2 Kc6 5. Ne4 0:01 9/10 0.67 134223 1. Ne1 Bf6 2. Ng2 Be7 3. Ne3 Bf8 4. Nf5 Kf6 5. a4 Ke6 0:03 10/11 0.71 317036 1. Ne1 Bf6 2. Nd3 Kd6 3. Kf5 Bg7 4. Nf2 Kc6 5. Ne4 Bh8 6. Ke6 Bg7 0:06 11/12 0.71 659092 1. Ne1 Bf6 2. Nd3 Kd6 3. Kf5 Bg7 4. Nf2 Kc6 5. Ne4 Kb6 6. Ke6 Kc6 0:12 12/13 0.72 1360741 1. Ne1 Bf6 2. Nd3 Kd6 3. Kf5 Bg7 4. a4 Bh8 5. Nf2 Bg7 6. Ne4+ Kc6 7. Ke6 Bh8 0:26 13/14 0.65 2920526 1. Ne1 Bf6 2. Nd3 Kd6 3. Kf5 Bg7 4. Nf2 Kd7 5. Ne4 Kc6 6. Ke6 Bh8 7. a4 Bg7 0:53 14/15 0.94 6072466 1. Ne1 Bf6 2. Nd3 Kd6 3. Kf5 Bg7 4. a4 Bh8 5. Nf2 Bg7 6. Kg6 Bf8 7. Kf6 Be7+ 8. Kg7 Ke6 9. Kxh6 3:02 15/16 1.66 19801945 1. Ne1 Bf6 2. Ng2 Be7 3. Ne3 Bd6 4. Nf5 Bf8 5. a4 Kf6 6. Kd5 h5 7. Ng3 hxg4 8. hxg4 Kf7 9. Kxe5 Bg7+ 10. Kd5 6:46 16/17 1.71 43653186 1. Ne1 Bf6 2. Ng2 Be7 3. Ne3 Bd6 4. Nf5 Bf8 5. a4 Kf6 6. Kd5 e4 7. Ne3 Be7 8. Kxe4 Bd6 9. Nf5 12:40 17/18 1.73 81531076 1. Ne1 Bf6 2. Ng2 Be7 3. Ne3 Bd6 4. Nf5 Bf8 5. a4 Kf6 6. Kd5 e4 7. Ne3 Bg7 8. Kxe4 Kg6 9. Kd5 Bd4 10. Nf5 24:15 18/19 1.59 156495718 1. Ne1 Bf6 2. Ng2 Be7 3. Ne3 Bd6 4. Nf5 Bf8 5. a4 Kf6 6. Kd5 e4 7. Ne3 Bg7 8. Nc2 Bf8 9. Kxe4 Bd6 10. Ne3 Bf4 After 1.Ne1 Bf8: Time Depth Score Positions Moves 0:00 7/8 1.55 20663 2. Nd3 Kd6 3. Nxe5 Bg7 4. Nd3 Bf6 5. a4 Bc3 0:00 8/9 1.50 46751 2. Nd3 Kd6 3. Nxe5 Bg7 4. Nd3 Bf6 5. Ne1 Bb2 6. Nc2 Bc3 0:01 9/10 1.44 135838 2. Nd3 Bd6 3. a4 Bf8 4. Nxe5 Kd6 5. Nd3 Bg7 6. Ne1 Bc3 7. Nf3 0:02 10/11 1.54 262354 2. Nd3 Bd6 3. a4 Bf8 4. Nxe5 Bd6 5. Nd3 Bf8 6. Kf3 Bd6 7. Ke3 0:05 11/12 1.58 575029 2. Nd3 Bd6 3. a4 Bf8 4. Nxe5 Bd6 5. Nd3 Bf8 6. Kf3 Be7 7. Ke3 Bd6 0:09 12/13 1.55 1129377 2. Nd3 Bd6 3. a4 Bf8 4. Nxe5 Bd6 5. Nd3 Be7 6. Ke3 Kd6 7. Kf3 Bf6 8. Ke4 Bc3 0:18 13/14 1.56 2253852 2. Nd3 Bd6 3. a4 Bf8 4. Nxe5 Bd6 5. Nd3 Be7 6. Ke3 Kd6 7. Nf2 Ke6 8. Ne4 Ke5 0:32 13/14 1.66 3864269 2. Nc2 Bd6 3. Ne3 Be7 4. Nf5 Bf8 5. a4 Kf6 6. Kd5 h5 7. Ng3 hxg4 8. hxg4 Kf7 9. Kxe5 Bg7+ 10. Kd5 0:47 14/15 1.71 5656267 2. Nc2 Bd6 3. Ne3 Be7 4. Nf5 Bf8 5. a4 Kf6 6. Kd5 e4 7. Ne3 Bg7 8. Kxe4 Ke6 9. Nf5 1:24 15/16 1.73 10113086 2. Nc2 Bd6 3. Ne3 Be7 4. Nf5 Bf8 5. a4 Kf6 6. Kd5 e4 7. Ne3 Bg7 8. Kxe4 Kg6 9. Kd5 Bd4 10. Nf5 2:42 16/17 1.73 19210591 2. Nc2 Bd6 3. Ne3 Be7 4. Nf5 Bf8 5. a4 Kf6 6. Kd5 e4 7. Ne3 Bg7 8. Kxe4 Kg6 9. Kd5 Bf8 10. Nf5 h5 5:06 17/18 1.61 35953369 2. Nc2 Bd6 3. Ne3 Be7 4. Nf5 Bf8 5. a4 Kf6 6. Kd5 e4 7. Ne3 Be7 8. Kxe4 Ke6 9. Nf5 Bf8 10. Ke3 Ke5 jm
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