Author: Dann Corbit
Date: 21:20:18 11/10/03
Go up one level in this thread
On November 10, 2003 at 23:53:57, Dann Corbit wrote:
>On November 10, 2003 at 15:43:59, Art Basham wrote:
>
>>[D]rnbq1rk1/pppp1ppp/5n2/2b5/2B4Q/5R2/PB3PPP/3R1K2 w - - 0 1
>>
>>Whites best first move here is RXN.
>>
>>I wonder if computers will show this, or just show BXN... thanks!
>
>After the capture RxN, the best result is probably a draw:
>
>[D]rnbq1rk1/pppp1ppp/5R2/2b5/2B4Q/8/PB3PPP/3R1K2 b - - acd 12; acn 434132023;
>acs 999; ce 0; pv Bxf2 Qh5 Bh4 Bxf7+ Kh8 Rh6 Rxf7+ Qxf7 Qg8 Bxg7+ Qxg7 Qe8+ Qg8
>Qe5+ Qg7 Qe8+; bm Bxf2;
>
>Note that the alternative Qe7 will eventually fail low:
>1. ... Qe7 2. Bd3 h6 3. Qg3 Bd4 4.
>Rxh6 Qf6 5. Rxf6 Bxb2 6. Qh4 Re8 7.
>Qh7+ Kf8 8. Qh8+ Ke7 9. Re1+ Kxf6 10.
>Qxe8
>
>ce about -1.6 pawns
A good hard look by Ruffian shows that Nc6 may be better than Bxf2 (which may
not draw after all):
E:\programme\winboard\Arena\Engines\Ruffian>ruffian_105 -h 256M -T \after.epd -t
999 -p 99
Hash size 268435456
Ruffian 1.0.5
feature done=0
Loading configuration: ruffian.cfg
Logfile: Mon Nov 10 20:55:53 2003
Total hash size 256M
Initializing tablebases: /chess/tb
Testing \after.epd, 999 seconds, extra ply 99
Testing: test 1 Solution: Bxf2
rnbq1rk1/pppp1ppp/5R2/2b5/2B4Q/8/PB3PPP/3R1K2 b - -
Depth Time Score Best line
8/19 1.17 5.78 ... Be7 Bd3 g6 Bc4 d5 Bxd5 Bxf6 Bxf6 Qd6
8/19 1.77 x.xx ... Nc6
8/20 2.44 5.80 ... Nc6 Bd3 g6 Bc4 Ne7 Bxf7+ Rxf7 Rxf7 Kxf7 Qc4+
d5 Qxc5
8--> 3.54 5.80 ... Nc6 Bd3 g6 Bc4 Ne7 Bxf7+ Rxf7 Rxf7 Kxf7 Qc4+
d5 Qxc5
9/22 3.75 -- ... Nc6
9/22 6.86 4.94 ... Nc6 Qf4 d5 Rxd5 Qe7 Rxc6 bxc6 Qg5 Qxg5 Rxg5 Rb8
Rxg7+
9--> 10.49 4.94 ... Nc6 Qf4 d5 Rxd5 Qe7 Rxc6 bxc6 Qg5 Qxg5 Rxg5 Rb8
Rxg7+
10/26 12.66 -- ... Nc6
10/26 17.05 2.18 ... Nc6 Bd3 g6 Qh6 Bd4 Bxg6 fxg6 Rxg6+ Kf7 Qxh7+
Ke8 Re1+ Be5 Bxe5 Nxe5 Rxe5+
10/26 22.50 x.xx ... Qe7
10--> 36.56 2.18 ... Nc6 Bd3 g6 Qh6 Bd4 Bxg6 fxg6 Rxg6+ Kf7 Qxh7+
Ke8 Re1+ Be5 Bxe5 Nxe5 Rxe5+
11/28 38.67 -- ... Nc6
11/29 46.69 0.00 ... Nc6 Bd3 g6 Qh6 Bd4 Bxd4 Nxd4 Bxg6 fxg6 Rxg6+
hxg6 Qxg6+ Kh8 Qh6+ Kg8 Qg6+
11/29 57.52 x.xx ... Qe7
11/31 1:44 x.xx ... Bxf2
11/31 1:55 0.99 ... Bxf2 Qxf2 d5 Rxd5 Nd7 Rf4 c5 Rd3 Qe7 Re3 Qg5
Rxf7
11--> 2:16 0.99 ... Bxf2 Qxf2 d5 Rxd5 Nd7 Rf4 c5 Rd3 Qe7 Re3 Qg5
Rxf7
12/31 2:34 -- ... Bxf2
12/31 2:47 0.00 ... Bxf2 Qh5 Be3 Rxf7 Qe7 Rxf8+ Kxf8 Qxh7 Ke8 Qh5+
Kd8 Qh8+ Qe8 Qh4+ Qe7 Qh8+
12--> 4:23 0.00 ... Bxf2 Qh5 Be3 Rxf7 Qe7 Rxf8+ Kxf8 Qxh7 Ke8 Qh5+
Kd8 Qh8+ Qe8 Qh4+ Qe7 Qh8+
13/35 5:35 -0.04 ... Bxf2 Qh5 Bh4 Bxf7+ Kh8 Rf5 Bg5 Rxg5 Qxg5 Qxg5
Rxf7+ Kg1 Nc6 Rf1 h6 Qxh6+ Kg8 Qg6 Rxf1+ Kxf1
13/35 6:25 x.xx ... Nc6
13/35 7:06 0.00 ... Nc6 Bd3 g6 Qh6 Bd4 Bxd4 Nxd4 Bxg6 fxg6 Rxg6+
hxg6 Qxg6+ Kh8 Qh6+ Kg8 Qg6+
13--> 9:33 0.00 ... Nc6 Bd3 g6 Qh6 Bd4 Bxd4 Nxd4 Bxg6 fxg6 Rxg6+
hxg6 Qxg6+ Kh8 Qh6+ Kg8 Qg6+
14/38 12:43 0.00 ... Nc6 Bd3 g6 Qh6 Bd4 Bxd4 Nxd4 Bxg6 fxg6 Rxg6+
hxg6 Qxg6+ Kh8 Qh6+ Kg8 Qg6+
14... 15:28 20/27 d5
Time: 16:39, cpu 93.66%, nodes 504550379, nps 505045
Hash: 128M, used 99%, hits 22%
EGTB: disabled
Best move: Nc6 (0.00) Not solved (0/1)
Time: 16:39, Average: 16:39, Nodes: 504550379, nps: 504700
Summery: 0/1
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Last modified: Thu, 15 Apr 21 08:11:13 -0700
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