Author: Robert Hyatt
Date: 07:31:52 03/18/01
Go up one level in this thread
On March 18, 2001 at 08:10:33, Sune Larsson wrote:
>
> [D]4b1k1/1p3p2/4pPp1/p2pP1P1/P2P4/1P1B4/8/2K5 w - - 0 29
>
> Estrin-Ivashin, 1947
>
>
> A bishop ending, same colors - 6 pawns each. Black is stuck with the
> typical bad French bishop. If his king and bishop move too far away,
> the blow Bxg6 followed by f7 will happen. The pawn chain, with its
> spearhead at f6, literally cramps black's two pieces. Estrin finds
> a nice way to make things clear:
>
> 1.b4! axb4 [1.-Bxa4 2.bxa5 followed by Kb2-a3-b4-c5, or 1.-b6 2.bxa5 bxa5
> 3.Bb5!]
>
> 2.Bc2 Bc6 3.Kb2 b6 4.Kb3 Kf8 5.Kxb4 Ke8 6.a5! 1-0
>
> [After 6.-bxa5+ 7.Kxa5 Kd8 8.Kb6 Be8 9.Kc5! Kc7 10.Bd3, black
> is in Zugzwang.]
>
>
> Test: White to move and win. This position might prove hard for chess
> programs to win, but you never know... The total game further down.
>
> Sune
>
Here is Crafty's output on a PIII/750 notebook:
19 14.07 0.66 1. Kb2 b6 2. Bc2 Kf8 3. b4 Bd7 4. bxa5
bxa5 5. Kc3 Ke8 6. Kd3 Bc6 7. Ke3 Kd7
8. Kf4 Ke8 9. Bd1 Kd7 10. Bb3
19-> 21.75 0.66 1. Kb2 b6 2. Bc2 Kf8 3. b4 Bd7 4. bxa5
bxa5 5. Kc3 Ke8 6. Kd3 Bc6 7. Ke3 Kd7
8. Kf4 Ke8 9. Bd1 Kd7 10. Bb3
20 27.52 0.60 1. Kb2 b6 2. Bb5 Bxb5 3. axb5 Kf8 4.
b4 axb4 5. Kb3 Ke8 6. Kxb4 Kd7 7. Kc3
Ke8 8. Kd3 Kd7 9. Ke3 Ke8 10. Kf4 Kd7
20 37.21 0.70 1. b4 axb4 2. Bc2 b3 3. Bxb3 b6 4.
Kd2 Bd7 5. Bc2 Kf8 6. Kc3 Ke8 <HT>
20-> 43.71 0.70 1. b4 axb4 2. Bc2 b3 3. Bxb3 b6 4.
Kd2 Bd7 5. Bc2 Kf8 6. Kc3 Ke8 <HT>
21 54.33 0.83 1. b4 axb4 2. Bc2 b3 3. Bxb3 b6 4.
Kd2 Bd7 5. Kc3 Kf8 6. Kb4 Ke8 7. a5
bxa5+ 8. Kxa5 Kd8 9. Kb6 Be8 10. Kc5
Kc7 11. Bc2 Bc6
21-> 1:17 0.83 1. b4 axb4 2. Bc2 b3 3. Bxb3 b6 4.
Kd2 Bd7 5. Kc3 Kf8 6. Kb4 Ke8 7. a5
bxa5+ 8. Kxa5 Kd8 9. Kb6 Be8 10. Kc5
Kc7 11. Bc2 Bc6
22 1:45 0.97 1. b4 axb4 2. Bc2 b3 3. Bxb3 b6 4.
Kd2 Bd7 5. Kc3 Bc8 6. Kb4 Ba6 7. a5
bxa5+ 8. Kxa5 Bd3 9. Kb6 Kf8 10. Kc5
Be4 11. Kc6 <HT>
22-> 2:29 0.97 1. b4 axb4 2. Bc2 b3 3. Bxb3 b6 4.
Kd2 Bd7 5. Kc3 Bc8 6. Kb4 Ba6 7. a5
bxa5+ 8. Kxa5 Bd3 9. Kb6 Kf8 10. Kc5
Be4 11. Kc6 <HT>
My quad xeon finds this in about 8 seconds...
>
>
>
>Estrin,Y - Ivashin,A [C17]
>cr SU ch, 1947
>
>1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5 5.Bd2 Nc6 6.Nb5 Bxd2+ 7.Qxd2 Nxd4 8.Nxd4 cxd4
>9.Qxd4 Ne7 10.Nf3 Bd7 11.Bd3 Qa5+ 12.c3 Qa4 13.Qxa4 Bxa4 14.Kd2 0-0 15.Nd4 Nc6
>16.f4 Nxd4 17.cxd4 Rfc8 18.g4 Rc7 19.f5 Rac8 20.b3 Be8 21.f6 g6 22.g5 a6 23.a4
>Rc3 24.Rac1 Rxc1 25.Rxc1 Rxc1 26.Kxc1 h6 27.h4 hxg5 28.hxg5 a5 29.b4 axb4 30.Bc2
>Bc6 31.Kb2 b6 32.Kb3 Kf8 33.Kxb4 Ke8 34.a5 1-0
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