Author: Dann Corbit
Date: 23:53:44 01/16/03
Go up one level in this thread
On January 17, 2003 at 02:33:37, Dann Corbit wrote:
>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
On the next iteration, CM is not so happy, but still feels ahead...
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
29:25 3/12 -1.64 215748867 1...h5 2.Nf6 Bg7 3.Qg4 Bxf6 4.gxf6
Kg8 5.Qg5 Qb6 6.bxc3 Kf8 7.Rxh5
gxh5 8.Qg7+ Ke8 9.Qg8+ Kd7 10.Qxf7+
Kd8 11.Bxc5 Qxc5 12.Bxc6 Rxc6 13.Qxb7
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