Author: Uri Blass
Date: 23:50:43 12/19/02
Go up one level in this thread
On December 19, 2002 at 14:46:06, Roy Eassa wrote:
>On December 19, 2002 at 14:21:21, Martin Giepmans wrote:
>
>>On December 19, 2002 at 12:23:09, José Antônio Fabiano Mendes wrote:
>>
>>> Fischer vs Stein, 1967 Sousse Interzonal
>>> [D]3q3r/4b1k1/4P1p1/rpp2p1p/1nn2Q2/5N1P/P4PP1/RBB1R1K1 w
>>> And here Fischer played 29. Bxf5, a move that baffles me.
>>> Please see ==> http://www.mark-weeks.com/chess/67fs07.htm
>>
>>White seems to be in trouble and perhaps Bxf5 is the only way out.
>>
>>SpiderChess chooses Bxf5 after 5 minutes and 20 seconds (AMD 2000 XP)
>>but the score is still negative after 22 minutes.
>>
>>PV at depth 13:
>>0:21:59 - 0.78 B1xF5 G6xF5 F3-E5 C4xE5 E1xE5 D8-D4 F4-G3 G7-H7 E5xF5
>> D4-D1 G1-H2 H8-F8 C1-D2 H5-H4 G3-C7 D1xA1 C7xE7 A1-G7
>> E7xH4 H7-G8 F5xC5
>>
>>Martin
>
>
>I've analyzed this game extensively and I think both sides can improve from the
>above. I also do think that Bxf5 was Fischer's best move, which wins unless
>Black plays perfectly:
>
>
>1.Bxf5!? {other moves are worse}
>
>1...gxf5
>
> [1...Qf8 2.Be4 Qxf4 3.Bxf4 was actually played]
>
>2.Qg3+
>
> [2.Ne5 Nxe5 3.Qxe5+ Bf6 4.Qg3+ Kh7 5.Qf4 unclear but not bad]
>
>2...Kh7 3.Ng5+ Bxg5 4.Bxg5 Qb8
>
> [4...Ra3! =+]
>
>5.Qh4 Qe8 6.Rad1 Ra7
>
> [6...Nb6 7.Rd8 Qg6 8.e7 Ra8 9.Re6! +-
> (9.e8Q Rxe8 10.Rexe8 Rxd8 11.Rxd8 also wins) ]
>
>7.Rd8! Qg6 8.e7! Re8
>
> [8...Ra8 9.e8Q
> (or 9.Re6! +- )
> 9...Rxe8 10.Rexe8 +-]
>
>9.Re6 Raxe7 10.Bxe7 Qxe6 11.Qxh5+ Qh6
>
> [11...Kg7 12.Rxe8 Qe1+ 13.Kh2 Qe5+ 14.g3 and Black gets mated]
>
>12.Qf7+ Qg7 13.Qxe8 and Black cannot avoid mate
Here is analysis of movei after many hours on p850
It can find fisher's move but it does not see Ra3 in it's main line
depth=15 -0.41 b1f5 g6f5 f4g3 g7h7 f3g5 e7g5 c1g5 d8b8 g5f4 b8g8 g3h4 g8e8 h4g5
e8g6 g5e7 g6g7 e7c5 b4a2 c5f5 h7g8
Nodes: 3460922106 NPS: 134050
Time: 07:10:18.05
The first 7 plies seem to be 5 plies for movei thanks to extensions
After the first moves I get
depth=10 +0.41 d8b8 g5f4 b8g8 g3h4 g8e8 h4g5 e8g6 g5e7 g6g7 e7c5 b4a2 c5f5 h7g8
Nodes: 6563675 NPS: 140279
Time: 00:00:46.79
depth=10 +0.41 d8b8 g5f4 b8g8 g3h4 g8e8 h4g5 e8g6 g5e7 g6g7 e7c5 b4a2 c5f5 h7g8
Nodes: 15538583 NPS: 139911
Time: 00:01:51.06
depth=11 -0.29 d8b8 g3h4 b8e8 a1d1 a5a7 d1d8 e8g6 d8d7 a7d7 e6d7 b4c6 d7d8q c6d8
g5d8
Nodes: 35064633 NPS: 138814
Time: 00:04:12.60
later it can see(I did not save the analysis and 9:32 is only the time of the
end of the iteration on p850)
depth=11 +0.28 a5a3 g3a3 c4a3 g5d8 h8d8 e6e7 d8e8 a1d1 b4c6 e1e6 c6d4 e6a6 a3c4
Nodes: 80904938 NPS: 141281
Time: 00:09:32.65
depth=12 +0.29 a5a3 g3a3 c4a3 g5d8 h8d8 e6e7 d8e8 a1d1 b4c6 e1e6 c6d4 e6a6 a3c4
a6a7
Nodes: 87772412 NPS: 141607
Time: 00:10:19.83
Uri
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