Author: Arturo Ochoa
Date: 10:34:52 02/27/01
Go up one level in this thread
On February 27, 2001 at 12:18:53, Sune Larsson wrote:
>
> [D]8/8/pp6/3b2K1/1P6/PN2k3/8/8 w - - 0 1
>
>
> This is old swedish chess history. The above position happened in a game
> between Bergkvist and Stolz, Stockholm 1941. White is in deep trouble.
> Knight moves to a1 or c2 will just lose the lonely one. But the knight
> has a more brave possibility! 1.Na5!! actually saved the draw for white.
> After 1.-bxa5 2.bxa5 black has the wrong bishop and white's king can just
> make it to a1, if black goes for both the white a-pawns.
>
> The game went like this: 1.Na5!! Kd3 2.Kf6 Kc3 3.Ke5 Bg2 4.Kd6 b5 5.Kc5 Kb2
> 6.Kb6 Kxa3 7.Kxa6 ½-½
>
> Test: This is a difficult one for chess programs and presupposes
> extended knowledge about a/h pawn and the wrong bishop.
>
> Sune
Thinking....
+---+---+---+---+---+---+---+---+ -
8 | | | | | | | | |
+---+---+---+---+---+---+---+---+ 00:00:00 00:16:11
7 | | | | | | | | |
+---+---+---+---+---+---+---+---+
6 | *p| *p| | | | | | | Time infinite
+---+---+---+---+---+---+---+---+ Hash 200 Mb
5 | | | | *B| | | K | | Engine Rebel Century 3.0
+---+---+---+---+---+---+---+---+ Personality Rebel Century 3
4 | | p | | | | | | | anti-GM Off
+---+---+---+---+---+---+---+---+ Tactics Off
3 | p | N | | | *K| | | | Bluff Chess Off
+---+---+---+---+---+---+---+---+ Style Normal
2 | | | | | | | | | Strength Strongest
+---+---+---+---+---+---+---+---+ Search Normal Search
1 | | | | | | | | |
+---+---+---+---+---+---+---+---+
a b c d e f g h
8/8/pp6/3b2K1/1P6/PN2k3/8/8 w - -
[Event "?"]
[Site "?"]
[Date "??.??.????"]
[Round "?"]
[White ""]
[Black ""]
[Result "*"]
[WhiteElo "?"]
[BlackElo "?"]
[FEN "8/8/pp6/3b2K1/1P6/PN2k3/8/8 w - - 0 1"]
1.*
00:00:00 1.01 -2.74 1.Kf5 Bxb3
00:00:00 1.04 -0.85 1.b5 Bxb3 2.bxa6
00:00:00 1.10 -0.23 1.Nc1
00:00:00 2.00 -0.21 1.Nc1 Ke4
00:00:00 3.00 -1.67 1.Nc1 Kd2 2.b5 Kxc1 3.Kf4
00:00:00 3.04 -0.26 1.Na1 Kd3 2.Kf4 b5 3.Ke5 Bf7 4.Kf6
Bc4 5.Kg5 Ba2 6.Kh5 Kc3 7.Nb3 Bxb3
8.Kg6 Bc2 9.Kg7 Kb2 10.Kf6 Kxa3
11.Ke5 Kxb4 12.Kd6 (0)
00:00:01 4.00 -0.23 1.Na1 Kd3 2.Kf4 b5 3.Ke5 Bf7 4.Kf6
Bc4 5.Kg5 Ba2 6.Kh5 Kc3 7.Nb3 Bxb3
8.Kg6 Bc2 9.Kg7 Kb2 10.Kf6 Kxa3
11.Ke5 Kxb4 12.Kd6 (0)
00:00:01 5.00 -0.23 1.Na1 Kd3 2.Kf4 b5 3.Ke5 Bf7 4.Kf6
Bc4 5.Kg5 Ba2 6.Kh5 Kc3 7.Nb3 Bxb3
8.Kg6 Bc2 9.Kg7 Kb2 10.Kf6 Kxa3
11.Ke5 Kxb4 12.Kd6 (1)
00:00:01 6.00 -0.19 1.Na1 Ke4 2.Nc2 Bb3 3.Ne1 Be6 4.a4
Kd5 5.Nf3 Kc4 6.Nd2 Kd3 7.Nf3 (1)
00:00:01 7.00 -0.20 1.Na1 Ke4 2.Kf6 b5 3.Nc2 Bc4 4.Ne1
Bd5 5.Ng2 Kf3 6.Ne1 Ke4 7.Ng2 Kf3
8.Ne1 (1)
00:00:01 8.00 -0.20 1.Na1 Kd3 2.Kf5 b5 3.Kf6 Kc3 4.Ke5
Bc4 5.Kf5 Ba2 6.Ke5 Bf7 7.Kf4 Bc4
8.a4 bxa4 9.b5 axb5 10.Kg3 a3 11.Kh2
Kb2 12.Kg3 (1)
00:00:01 9.00 -0.20 1.Na1 Kd3 2.Kf5 b5 3.Kf6 Kd4 4.Nc2
Ke4 5.Ne1 Kd4 6.Nc2 Ke4 7.Ne1 Kd4 (1)
00:00:01 10.00 -1.34 1.Na1 Kd3 2.Kf5 Kc3 3.Ke5 Ba8 4.b5
Kb2 5.bxa6 Kxa1 6.Kf5 Kb2 7.a4 (1)
00:00:02 11.00 -1.45 1.Na1 Kd3 2.Kf5 Kc3 3.Ke5 Bg2 4.b5
Kb2 5.bxa6 Kxa3 6.a7 Kb4 7.a8 (1)
00:00:04 12.00 -1.96 1.Na1 Kd3 2.Kf5 Kc3 3.Ke5 Bc4 4.a4
Kxb4 5.Kd4 Kxa4 6.Kxc4 b5 7.Kd4 (2)
00:00:06 13.00 -1.97 1.Na1 Kd3 2.Kf5 Kc3 3.Ke5 Bc4 4.Kd6
Kb2 5.Kc6 b5 6.Kb6 Kxa1 7.Kxa6 Kb2
8.Kb6 Kxa3 (4)
00:00:13 14.00 -1.97 1.Na1 Kd3 2.Kf5 Kc3 3.Ke5 Bc4 4.Kd6
Kb2 5.Kc6 b5 6.Kb6 Kxa1 (6)
00:00:26 15.00 -2.64 1.Na1 Kd3 2.Kf5 Kc3 3.Ke5 Bc4 4.Ke4
b5 5.Ke5 Kb2 (15)
Positions : 20.617.318
Nodes per second : 542.561
Extensions (checks) : 449.153 (2%)
Extensions (captures) : 56.684 (0%)
Extensions (king safety) : 8 (0%)
Extensions (on depth) : 0 (0%)
Extensions (remaining) : 29.565 (0%)
Extensions (total) : 535.410 (2%)
Hash Table : 1.505.494 2.342.424 (5%)
Average depth : 17
Deepest depth : 37
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Last modified: Thu, 15 Apr 21 08:11:13 -0700
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