Author: Robert Hyatt
Date: 21:33:33 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
>
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
>
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>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
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