Author: Mike S.
Date: 12:31:05 08/11/02
Go up one level in this thread
On August 11, 2002 at 15:00:59, Uri Blass wrote:
>>On August 11, 2002 at 12:26:17, Mike S. wrote:
>>(...)
>>>Here's a nice example of Aristarch's skills:
>>>Aristarch 4.4 - Pharaon 2.61 [E04]
>>>[D]r2bk1r1/1p3ppp/p1b1p3/Bp6/4P3/5BP1/PP3P1P/2RR2K1 w q - 0 19
>>>19.Rxc6! Bxa5 [19...bxc6 20.e5 Bxa5 (20...Ke7?? 21.Bb4+ c5 22.Bxc5+ Ke8 23.Bc6
>>>Mate!) 21.Bxc6+ returns exchange + pawn] 20.Rcd6, followed by Rd7 etc.
>>(...)
>After 19.Rxc6 Bxa5 20.Rcd6 is not winning because of Rd8 when
>Rd7 is impossible so this example only demonstrates pharoan's wealnesses.
>
>Uri
I don't think so... the example, as an illustration of Aristarch's calculation
skills, is ok if
A) 19.Rxc6 was significantly better than the alternatives, i.e. Bc3 (and not an
obvious move, but a combination). Aristarch's eval was much worse before btw.
and B) 19.Rxc6 has no refutation. I don't think 20...Rd8 refutes Rxc6, IOW it is
correct.
(I didn't claim it's winning.)
Regards,
M.Scheidl
[Event "8m+3s P3/700"]
[Site "Engine Match"]
[Date "2002.08.10"]
[Round "5"]
[White "Aristarch 4.4"]
[Black "Pharaon 2.61"]
[Result "1-0"]
1. d4 {+0.01/1 0s} Nf6 {Buch 0s} 2. c4 {+0.01/1 0s} e6
{Buch 0s} 3. Nf3 {+0.01/1 0s} d5 {Buch 0s} 4. g3 {+0.01/1
0s} dxc4 {Buch 0s} 5. Bg2 {+0.01/1 0s} a6 {Buch 0s} 6. O-O
{-0.45/10 22s} Nc6 {Buch 0s} 7. Nbd2 {-0.21/10 10s} Nxd4
{+0.81/10 15s} 8. Nxc4 {-0.16/9 10s} Nxf3+ {+0.98/9 14s}
9. Bxf3 {-0.12/9 3s} Qxd1 {+0.70/10 14s} 10. Rxd1 {-0.03/9
4s} Nd5 {+0.72/9 14s} 11. e4 {-0.04/9 4s} Nb6 {+0.51/11
13s} 12. Nxb6 {+0.03/10 5s} cxb6 {+0.27/12 12s} 13. Bf4
{+0.06/11 25s} Bd7 {+0.61/10 13s} 14. Be5 {-0.07/12 58s}
Rg8 {+0.58/10 11s} 15. Bd4 {-0.03/11 8s} b5 {+0.47/11 23s}
16. Rac1 {-0.07/10 18s} Bc6 {+0.44/10 12s} 17. Bb6
{-0.18/10 32s} Be7 {+0.52/9 9s} 18. Ba5 {-0.47/10 44s} Bd8
{+0.54/9 12s} 19. Rxc6 {+0.01/11 5s} Bxa5 {+0.28/11 5s}
20. Rcd6 {+0.16/11 4s} Rb8 {+0.13/11 13s} 21. Rd7 {+0.24/10
2s} e5 {+0.02/12 11s} 22. R7d5 {+0.44/12 12s} f6 {-0.04/11
8s} 23. Rd7 {+0.59/11 6s} Bb6 {-0.45/11 11s} 24. Bg4
{+0.87/10 2s} f5 {-0.73/11 10s} 25. exf5 {+1.15/12 12s} Bd4
{-0.75/10 7s} 26. f6 {+1.29/11 2s} gxf6 {-0.82/10 4s}
27. Rxh7 {+1.29/11 6s} Kd8 {-1.03/10 21s} 28. Be6 {+1.72/11
1s} Rf8 {-2.21/12 10s} 29. Rd2 {+1.65/10 5s} b6 {-1.34/11
8s} 30. b4 {+1.86/10 4s} a5 {-3.04/10 11s} 31. Rc2 {+2.28/9
1s} f5 {-5.95/9 7s} 32. Rcc7 {+8.01/10 4s} Rf6 {-8.45/10
9s} 33. Rcd7+ {+9.21/9 4s} Ke8 {-8.45/10 9s} 34. Ra7
{+9.63/9 0s} 1-0
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