Author: Martin Giepmans
Date: 08:10:22 12/16/01
Go up one level in this thread
On December 15, 2001 at 22:59:01, Kim Roper Jensen wrote:
>Hi
>
>Here is a little middlegame/endgame position that seems very difficult for
>computers, maybe because its a drawing combination but anyway here it goes
>
>The correct move to get is Bc3, with the idea 1.Bc3,b4 2.axb4,axb4 3.Bxg7!!
>and white either gets the rook and plays Nb6,c4 and have an better endgame or
>the perpetual check f7,h6
>
>the position is from J.Speelman-D.Velimirovic Maribor 1980 round 10
>
>[D] 2r1nbk1/5ppp/8/pp2BN2/2p5/P5P1/1P2PP1P/3R1K2 w - - 0 1
>
>Junior 7(not deep) with tb and 128Megs of hashtable on a dual P3 1Ghz dont get
>in 10Mins
>analysis from the position:
>Junior 7 - ,.
>2r1nbk1/5ppp/8/pp2BN2/2p5/P5P1/1P2PP1P/3R1K2 w - - 0 1
>
>Analysis by Junior 7:
>
>1.Rd7 Bc5
> ² (0.70) Depth: 3 00:00:00
>1.Rd7 Bc5
> ² (0.70) Depth: 3 00:00:00
>1.Rd7 Bc5
> ² (0.70) Depth: 3 00:00:00
>1.Rd7 Bc5
> ² (0.70) Depth: 3 00:00:00
>1.Rd7 Rc5 2.Ne7+ Bxe7 3.Rxe7 Kf8
> ² (0.51) Depth: 6 00:00:00 5kN
>1.Rd7 Rc5 2.f4 f6 3.Ne7+ Bxe7 4.Rxe7 Kf8 5.Bd4 Rd5 6.Re4
> = (-0.11) Depth: 9 00:00:00 80kN
>1.Bc3 b4
> = (-0.05) Depth: 9 00:00:00 111kN
>1.g4 f6 2.Bc3 g6 3.Nd4 b4 4.Bd2 Nc7 5.a4
> ² (0.30) Depth: 9 00:00:00 232kN
>1.e4 g6 2.Nd4 b4 3.Ke2 f6 4.Bf4 c3 5.bxc3
> ² (0.32) Depth: 9 00:00:00 270kN
>1.e4 f6 2.Bd4 b4 3.axb4 axb4 4.Ke2 c3 5.bxc3 bxc3
> ² (0.28) Depth: 12 00:00:01 659kN
>1.e4 b4 2.axb4 axb4 3.Rc1 f6 4.Bf4 c3 5.bxc3 bxc3 6.g4 c2
> = (0.01) Depth: 15 00:00:12 9413kN
>1.f4 g6 2.Ne3 Bg7 3.Nd5 Bxe5 4.fxe5 Kg7 5.Kf2 Rd8 6.Ke1 h5
> = (0.14) Depth: 15 00:00:16 12111kN
>1.f4 b4 2.axb4 axb4 3.Rc1 f6 4.Bd4 c3 5.bxc3 Nd6 6.Nxd6 Bxd6 7.h3 b3
> = (0.03) Depth: 17 00:01:06 44964kN
>1.e4 b4 2.axb4 axb4 3.Rc1 g6 4.Ne3 c3 5.bxc3 Nd6 6.Nd5 b3 7.Nf6+ Kg7
> = (0.04) Depth: 17 00:01:24 56858kN
>1.Ne3 f6 2.Bd4 Rd8 3.f3 Kf7 4.Kf2 Ke6 5.a4 Nc7 6.axb5 Nxb5
> = (0.05) Depth: 17 00:02:35 95502kN
>1.Ne3 f6 2.Bd4 Kf7 3.Nd5 Nd6 4.Bc3 Ra8 5.e4 Nxe4 6.Nc7 Rb8 7.Rd7+ Be7 8.Bxa5
> = (0.11) Depth: 18 00:04:57 171496kN
>1.Ne3 f6 2.Bd4 b4 3.a4 Nd6 4.f3 c3
> = (0.05) Depth: 20 00:10:38 337068kN
>
>(, . 16.12.2001)
Same thing with SpiderChess (AMD 1200):
05 00:00:00 + 0.21 E5-C3 B5-B4 A3xB4 G7-G6 F5-D4 A5xB4
06 00:00:00 + 0.21 E5-C3 B5-B4 A3xB4 G7-G6 F5-D4 A5xB4
07 00:00:00 - 0.24 E5-C3 B5-B4 A3xB4 A5xB4 C3-D4 C8-D8 D1-D2
00:00:00 - 0.01 D1-D5 G7-G6 F5-D4 F7-F6 E5-F4 G6-G5 F4-D2
00:00:00 0.00 E5xG7 E8xG7 F5-H6 G8-H8 H6xF7 H8-G8 F7-H6 G8-H8 H6-F7
08 00:00:01 0.00 E5xG7 E8xG7 F5-H6 G8-H8 H6xF7 H8-G8 F7-H6 G8-H8 H6-F7
00:00:01 + 0.01 F5-E3 F7-F6 E5-C3 B5-B4 A3xB4 A5xB4 C3-D4 F8-D6
09 00:00:02 - 0.09 F5-E3 F7-F6 E5-D4 C8-D8 D4-B6 D8xD1 E3xD1 B5-B4 A3xB4
A5xB4
00:00:04 0.00 E5xG7 E8xG7 F5-H6 G8-H8 H6xF7 H8-G8 F7-H6 G8-H8 H6-F7
10 00:00:11 0.00 E5xG7 E8xG7 F5-H6 G8-H8 H6xF7 H8-G8 F7-H6 G8-H8 H6-F7
11 00:00:34 0.00 E5xG7 E8xG7 F5-H6 G8-H8 H6xF7 H8-G8 F7-H6 G8-H8 H6-F7
12 00:01:47 - 0.37 E5xG7 F8xG7 F5-E7 G8-F8 E7xC8 G7xB2 A3-A4 B5xA4 C8-B6
C4-C3 B6xA4 C3-C2 A4xB2 C2xD1D B2xD1 A5-A4
00:02:42 - 0.08 F5-E3 B5-B4 A3xB4 A5xB4 E3-D5 C8-C6 E2-E3 H7-H6 E5-D4
C4-C3 B2xC3 B4-B3 F1-G2
13 00:05:20 - 0.06 F5-E3 B5-B4 A3xB4 A5xB4 E3-D5 C8-C6 E5-D4 E8-C7 D5xC7
C6xC7 D4-E5 C7-C6 D1-D7 C4-C3 B2xC3 B4xC3
Maybe the problem (as suggested by Uri) is that there is no draw
after Bc3 g6(!):
05 00:00:00 + 0.01 F5-D4 B5-B4 A3xB4 A5xB4 C3-D2
06 00:00:00 + 0.01 F5-D4 B5-B4 A3xB4 A5xB4 C3-D2 C8-A8
07 00:00:00 - 0.49 F5-D4 B5-B4 A3xB4 A5xB4 C3-D2 C8-D8 D4-C6
00:00:00 - 0.48 F5-H4 B5-B4 A3xB4 A5xB4 C3-E5 C4-C3 B2xC3 B4xC3
00:00:00 - 0.45 F5-E3 B5-B4 A3xB4 A5xB4 C3-E5 C4-C3 B2xC3 B4xC3
08 00:00:00 - 0.73 F5-E3 B5-B4 A3xB4 A5xB4 C3-D2 C4-C3 B2xC3 B4xC3 D2-C1
00:00:00 - 0.49 F5-D4 B5-B4 A3xB4 A5xB4 C3-D2 C4-C3 B2xC3 B4xC3 D2-F4
09 00:00:01 - 0.52 F5-D4 B5-B4 A3xB4 A5xB4 C3-D2 F7-F5 D4-E6 C4-C3 B2xC3
B4xC3
10 00:00:03 - 0.78 F5-D4 B5-B4 A3xB4 A5xB4 C3-E1 C4-C3 B2xC3 B4xC3 D1-C1
F8-B4 H2-H4
11 00:00:08 - 0.60 F5-D4 B5-B4 A3xB4 A5xB4 C3-E1 F7-F5 D4-E6 C4-C3 B2xC3
B4xC3 F1-G2 G8-F7
12 00:00:20 - 0.60 F5-D4 B5-B4 A3xB4 A5xB4 C3-E1 F7-F5 D1-C1 F8-G7 E2-E3
B4-B3 E1-B4 G8-F7 C1-C3
13 00:00:57 - 0.60 F5-D4 B5-B4 A3xB4 A5xB4 C3-E1 E8-F6 D1-C1 F6-D5 E2-E4
F8-G7 E4xD5 G7xD4 E1xB4 D4xB2
00:01:34 - 0.16 F5-E3 B5-B4 A3xB4 A5xB4 C3-D4 C4-C3 B2xC3 B4xC3 D1-C1
F8-H6 C1xC3 C8xC3 D4xC3 H6xE3 F2xE3
14 00:03:15 - 0.16 F5-E3 B5-B4 A3xB4 A5xB4 C3-D4 C4-C3 B2xC3 B4xC3 D1-C1
F8-H6 C1xC3 C8xC3 D4xC3 H6xE3 F2xE3 E8-D6
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