Author: Dann Corbit
Date: 23:33:37 01/16/03
Go up one level in this thread
On January 17, 2003 at 02:20:16, Dann Corbit wrote:
>On January 17, 2003 at 01:54:10, Dann Corbit wrote:
>
>>On January 16, 2003 at 23:47:33, Eric Tom wrote:
>>
>>>Hi!
>>>
>>>In the following position, NCO proclaims that this is a draw. Can any chess
>>>engines prove otherwise? I'm just curious if there's anyway at all Black can
>>>win. NCO's continuation is as follows 20 Ng4 bxc3 21 Rh3 f5 22 Nf6 h6 23 Qxh6+
>>>Bxh6 24 Rxh6+ Kg7 25 Rh7+ Kf8 followed by perpetual checking. Sorry, I do not
>>>know how to post the board in this message.
>>
>>From here:
>>[D]r1r2b1k/1bq2p1p/p1npp1pN/2nB2P1/1p2P2Q/2N1B1R1/PPP2P1P/2KR4 w - - ce -160;
>>acd 13; acs 180; pv Bxc5 dxc5 Bxc6 Bxc6 Ne2 Bb5 Rd2 c4 Rf3 Be8 Qf4 c3 bxc3 Qxf4
>>Nxf4 bxc3;|Be3c5
>>{Bxc5 chosen instead of Ng4}
>>
>>[D]r1r2b1k/1bq2p1p/p1npp1p1/2nB2P1/1p2P1NQ/2N1B1R1/PPP2P1P/2KR4 b - - ce 494;
>>acd 12; acs 180; pv bxc3 Nf6 h5 Bxc5 dxc5 Bxe6 Qb6 Bb3 c4 Nd7 cxb2+ Kxb2 Bg7+
>>Kb1 Qb4;|bc3
>>{bxc3 chosen and played}
>>
>>[D]r1r2b1k/1bq2p1p/p1npp1p1/2nB2P1/4P1NQ/2p1B1R1/PPP2P1P/2KR4 w - - ce -448; acd
>>11; acs 180; pv Nf6 h5 Bxc5 dxc5 Bxe6 Qb6 Rxc3 fxe6 Rd7 Rc7 Nxh5 Bh6 Rxc7 Qxc7
>>gxh6 gxh5 Qxh5;|Ng4f6
>>{Nf6 chosen instead of Rh3}
>>
>>[D]r1r2b1k/1bq2p1p/p1npp1p1/2nB2P1/4P1NQ/2p1B2R/PPP2P1P/2KR4 b - - ce 510; acd
>>12; acs 180; pv h5 Bxc5 dxc5 Nf6 cxb2+ Kb1 Bg7 Bxe6 Bxf6 Bxc8 Bxc8 gxf6 Bxh3
>>Qxh3 Rb8;|h5
>>{h5 chosen (HUGE advantage) instead of f5. Is f5 a collosal blunder?}
>
>h5 holds a full piece advantage. f5 is Ruffian's *5th* choice.
>
>E:\programme\winboard\ruffian>ruffian -h 300M -T e:\dead.epd -t 999 -p 99
>Hash size 314572800
>Ruffian 1.0.1
>feature done=0
>Loading configuration: ruffian.cfg
>Warning: EGTB_HASH_SIZE changed, default=1048576, newvalue=8388608
>Logfile: Thu Jan 16 23:02:59 2003
>Total hash size 300M
>Initializing tablebases: /programme/winboard/nalimov
>Testing e:\dead.epd, 999 seconds, extra ply 99
>Testing: test 1 Solution: cxb2+
> r1r2b1k/1bq2p1p/p1npp1p1/2nB2P1/4P1NQ/2p1B2R/PPP2P1P/2KR4 b - -
> Depth Time Score Best line
> 7/21 1.64 4.61 ... cxb2+ Kxb2 h5 gxh6 Be7 Qg3 Na4+ Kb3 exd5 exd5
> Nb4 Kxa4
> 7--> 1.95 4.61 ... cxb2+ Kxb2 h5 gxh6 Be7 Qg3 Na4+ Kb3 exd5 exd5
> Nb4 Kxa4
> 8/24 3.78 4.62 ... cxb2+ Kxb2 h5 gxh6 Be7 Bg5 exd5 Bf6+ Kh7 exd5
> Qb6+ Ka1 Bxf6+ Qxf6
> 8--> 4.92 4.62 ... cxb2+ Kxb2 h5 gxh6 Be7 Bg5 exd5 Bf6+ Kh7 exd5
> Qb6+ Ka1 Bxf6+ Qxf6
> 9/31 11.40 4.52 ... cxb2+ Kxb2 h5 gxh6 exd5 Bxc5 Be7 Qg3 dxe4 Bxd6
> Qd7
> 9--> 14.45 4.52 ... cxb2+ Kxb2 h5 gxh6 exd5 Bxc5 Be7 Qg3 dxe4 Bxd6
> Qd7
> 10/31 23.48 ++ ... cxb2+
> 10/33 1:16 -- ... cxb2+
> 10/33 1:26 3.17 ... cxb2+ Kb1 h5 Bxc5 dxc5 Nf6 Bg7 Nxh5 gxh5 Qxh5+
> Kg8 Qh7+ Kf8 Bxe6 Rd8 Bd5
> 10/33 1:46 x.xx ... h5
> 10/33 1:55 3.64 ... h5 Bxc5 dxc5 Nf6 Qb6 bxc3 Qa5 Nxh5 Qa3+ Kb1 exd5
> Nf6+ Kg7 exd5
> 10--> 2:01 3.64 ... h5 Bxc5 dxc5 Nf6 Qb6 bxc3 Qa5 Nxh5 Qa3+ Kb1 exd5
> Nf6+ Kg7 exd5
> 11/33 3:02 3.66 ... h5 Nf6 Bg7 Kb1 Ne5 Bxc5 exd5 Bxd6 Qb6 Ba3 cxb2
> exd5
> 11--> 4:03 3.66 ... h5 Nf6 Bg7 Kb1 Ne5 Bxc5 exd5 Bxd6 Qb6 Ba3 cxb2
> exd5
> 12/35 5:30 3.50 ... h5 Nf6 Bg7 Bxc5 dxc5 Nxh5 gxh5 Bxe6 cxb2+ Kb1
> Rd8 Qxh5+ Kg8 Qh7+ Kf8
> 12--> 8:34 3.50 ... h5 Nf6 Bg7 Bxc5 dxc5 Nxh5 gxh5 Bxe6 cxb2+ Kb1
> Rd8 Qxh5+ Kg8 Qh7+ Kf8
> 13/38 11:59 3.37 ... h5 Nf6 Bg7 bxc3 Qa5 Qxh5+ gxh5 Rxh5+ Bh6 Rxh6+
> Kg7 Rh7+ Kf8 g6 Ne5 Bxc5 dxc5 g7+ Ke7 Bxb7 Qa3+ Kb1
> Kxf6 Bxa8 Rxa8
> 13... 14:52 5/37 f5
cxb2 is definitely fool's gold. But it looks like h5 wins (also according to
Chessmaster 9000):
Time Depth Score Positions Moves
0:00 1/3 -4.61 2435 1...h5 2.Bxc5 dxc5 3.Bc4 Qf4+ 4.Ne3
Qxh4 5.Rxh4 cxb2+ 6.Kxb2
0:00 1/4 -4.20 10155 1...h5 2.Bb3 cxb2+ 3.Kxb2 Nxe4
4.Nf6 Nxf6 5.gxf6
0:00 1/5 -4.40 22720 1...h5 2.Bb3 Nxb3+ 3.axb3 Ne5 4.Nxe5
cxb2+ 5.Kxb2 dxe5
0:00 1/6 -4.80 82123 1...h5 2.Bxc5 dxc5 3.Bxc6 cxb2+
4.Kxb2 Bxc6 5.f3 Rd8
0:01 1/7 -4.92 178796 1...h5 2.Bxc5 cxb2+ 3.Kxb2 exd5
4.exd5 dxc5 5.dxc6 Bxc6
0:03 1/7 -4.95 384305 1...cxb2+ 2.Kxb2 h5 3.Bxc5 exd5
4.Ba3 dxe4 5.Ka1 Ne5 6.Nxe5 dxe5
7.Bxf8 Rxf8
0:15 1/8 -4.47 1860190 1...cxb2+ 2.Kb1 h5 3.Bxc5 dxc5
4.Nf6 Bg7 5.Bxe6 Rd8 6.Bd5 Nb4
0:45 1/9 -4.00 5434833 1...cxb2+ 2.Kb1 h5 3.Nf6 Bg7 4.Bxe6
Bxf6 5.Bxc8 Bxc8 6.gxf6 Bxh3 7.Bxc5
dxc5 8.Qxh3
2:03 1/10 -4.03 14999836 1...cxb2+ 2.Kb1 h5 3.Nf6 Bg7 4.Bxc5
dxc5 5.Bxe6 Rd8 6.Bd5 Nd4 7.c3
Bxf6 8.gxf6 Bxd5 9.cxd4
7:06 2/11 -1.84 51536240 1...cxb2+ 2.Kb1 h5 3.Nf6 Bg7 4.Bxc5
dxc5 5.Qg4 Bxf6 6.Rxh5+ Kg8 7.gxf6
Qd6 8.Qg5 Qf8 9.Bxe6
9:26 2/11 -3.69 68760452 1...h5 2.Nf6 Bg7 3.bxc3 exd5 4.Qxh5+
gxh5 5.Rxh5+ Bh6 6.Rxh6+ Kg7 7.Rh7+
Kf8 8.Rh8+ Ke7 9.Nxd5+ Kd7 10.Nxc7
Kxc7 11.Rh7
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