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Subject: Re: Testposition - Tactics (CM8000 Results)

Author: John Merlino

Date: 15:08:56 07/11/01

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On July 11, 2001 at 12:52:30, Sune Larsson wrote:

>
> [D]r5nr/pp3kpp/2pb4/3pn1P1/8/2N1B2B/PPP2P1P/2KRR3 w - - 0 20
>
> IM Berg,Emanuel 2496 - GM Akesson,Ralf 2481
>
>
> This is a position from today's 10th round in the SWE-ch. 19 year old
> Berg is a very gifted tactician. Here he chose 20.Nxd5!, got an advantage
> and won the game vs his more experienced opponent. It was from a e5-pushed
> Caro-Kann.
>
> Test: How long before your program finds and chooses 20.Nxd5!
>
> The whole game below.
>
>
>[Event "SM"]
>[Site "SWE"]
>[Date "2001.07.11"]
>[Round "10"]
>[White "Berg, Emanuel"]
>[Black "Akesson, Ralf"]
>[Result "1-0"]
>[ECO "B12"]
>[WhiteElo "2496"]
>[BlackElo "2481"]
>[PlyCount "61"]
>[EventDate "2001.07.11"]
>
>1. e4 c6 2. d4 d5 3. e5 Bf5 4. Nc3 e6 5. g4 Bg6 6. Nge2 f6 7. Nf4 Bf7 8. Qe2
>fxe5 9. Qxe5 Nd7 10. Qe2 Qf6 11. g5 Qxd4 12. Nxe6 Bxe6 13. Qxe6+ Be7 14. Bh3
>Qe5+ 15. Be3 Qxe6 16. Bxe6 Bd6 17. O-O-O Ke7 18. Bh3 Ne5 19. Rhe1 Kf7 20. Nxd5
>cxd5 21. Rxd5 Rd8 22. Bc5 Nc4 23. Rd4 b6 24. Be6+ Kg6 25. Bxc4 bxc5 26. Re6+
>Kxg5 27. Rdxd6 Nf6 28. Rc6 Rd7 29. Rxc5+ Kh4 30. Re3 Ng4 31. Re4 1-0
>
>Sune

Well, that was annoying. After a long think (almost 5 minutes), CM8000 came up
with Nxd5. Then, 14 seconds later, it switched to a move that it hadn't thought
"best" for over 4 minutes! <sigh> After that, it was a long time before it came
around again.

So, if the time control and the hardware were JUUUUUST right....

Time	Depth	Score	Positions	Moves
0:00	1/4	1.08	5428		20. Ne4 Bb4 21. c3 dxe4 22. cxb4
0:00	2/5	0.96	38290		20. Ne4 Bb4 21. Nd2 Ne7 22. f4
0:01	2/6	0.98	74134		20. Ne4 Be7 21. Nd2 h6 22. gxh6
					Nxh6 23. f3
0:03	3/7	0.98	198157		20. Ne4 Be7 21. Nd2 h6 22. gxh6
					Nxh6 23. f3
0:10	3/8	0.74	658438		20. Ne4 Bb4 21. Nd2 Bxd2+ 22. Bxd2
					Nf3 23. Re3 Nxd2 24. Rxd2 Re8
0:34	4/9	0.64	2422711		20. Ne4 Bb4 21. Nd2 h6 22. Bd4
					Bxd2+ 23. Rxd2 Nf3 24. Re6 hxg5
0:45	4/9	0.74	3150143		20. Re2 h6 21. Ne4 Be7 22. Nc5
					Bxc5 23. g6+ Nxg6 24. Bxc5 Nf4
1:55	5/10	0.49	8371693		20. Re2 h6 21. f4 Nc4 22. Rf1 Nxe3
					23. Rxe3 g6 24. Be6+ Kg7 25. Ne2
					Ne7
4:40	5/10	0.56	21322468	20. Nxd5 cxd5 21. Rxd5 Nc4 22.
					Bc5 Bf4+ 23. Kb1 Kg6 24. Rd7 Rc8
					25. Bxa7 Nd2+ 26. Ka1 Rxc2 27.
					Rxb7 Bxg5
4:54	5/10	0.61	22437955	20. Ne4 Bb4 21. Nd2 h6 22. gxh6
					Nxh6 23. Rg1 Bxd2+ 24. Bxd2 Nf3
					25. Rg3 Nxd2 26. Rxd2
8:38	6/11	0.60	39383091	20. Ne4 Bb4 21. Nd2 h6 22. gxh6
					Nxh6 23. Rg1 Ng8 24. Rg3 Nf6 25.
					f4
15:16	6/11	0.92	71501077	20. Nxd5 cxd5 21. Rxd5 Nc4 22.
					Bf1 Nxe3 23. Rxe3 Bxh2 24. Rf5+
					Kg6 25. Bd3 Bb8 26. Rd5+ Kf7 27.
					Rd7+ Kf8 28. Rf3+ Ke8 29. Rxg7

jm



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