Author: Sune Larsson
Date: 00:59:47 03/10/01
Go up one level in this thread
On March 10, 2001 at 00:33:33, Robert Hyatt wrote: >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 >> > > >Crafty on my notebook says that Ne1 wins a pawn. Takes just a second or two >to find this. After 2 minutes the eval is still over +1. Looks like a zug >with black having to push the e pawn and losing it. Here is the last >couple of search results: > > 14-> 7.28 0.56 1. Ne1 Bf6 2. Nd3 Kd6 3. b4 cxb4 4. > axb4 axb4 5. Nxb4 Bg7 6. Nd5 Kc5 7. > Kd3 Bf8 > 15 10.39 0.47 1. Ne1 Bf6 2. Nd3 Kd6 3. Kf5 Bg7 4. > Nf2 Kd7 5. Ke4 Kc6 6. Nd3 Kd6 <HT> > 15-> 13.29 0.47 1. Ne1 Bf6 2. Nd3 Kd6 3. Kf5 Bg7 4. > Nf2 Kd7 5. Ke4 Kc6 6. Nd3 Kd6 <HT> > 16 17.57 ++ 1. Ne1!! > 16-> 32.09 0.86 1. Ne1 Bf6 2. Nd3 Kd6 3. Kf5 Bg7 4. > Nf2 Kd7 5. Ke4 Kc6 6. Nd3 Kd6 <HT> > 17 1:03 1.00 1. Ne1 Bf8 2. Nd3 Bd6 3. a4 Kf6 4. > Kd5 e4 5. Kxe4 Ke6 6. Ne1 Bg3 7. Nc2 > Bf2 8. Kf3 Bh4 9. Ke4 > 17-> 1:25 1.00 1. Ne1 Bf8 2. Nd3 Bd6 3. a4 Kf6 4. > Kd5 e4 5. Kxe4 Ke6 6. Ne1 Bg3 7. Nc2 > Bf2 8. Kf3 Bh4 9. Ke4 > 18 2:08 1.05 1. Ne1 Bf8 2. Nd3 Bd6 3. a4 Kf6 4. > Kd5 e4 5. Kxe4 Ke6 6. Ne1 Bg3 7. Nc2 > Bf2 8. Ne3 Bxe3 9. Kxe3 Ke5 > 18-> 2:59 1.05 1. Ne1 Bf8 2. Nd3 Bd6 3. a4 Kf6 4. > Kd5 e4 5. Kxe4 Ke6 6. Ne1 Bg3 7. Nc2 > Bf2 8. Ne3 Bxe3 9. Kxe3 Ke5 The above line 1.Ne1 Bf8 2.Nd3 Bd6 3.a4 and now 3.-Bf8 4.Nxe5 Bd6 is given as a draw by the author. See below. 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
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.