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Subject: Re: A hart test position (tactical)

Author: John Merlino

Date: 12:42:56 04/11/02

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On April 11, 2002 at 07:32:58, Eduard Nemeth wrote:

>This game I find in the NEW of TWIC (number 387):
>
>
>[Event "TCh-NOR Qualifier "]
>[Site "?"]
>[Date "2002.??.??"]
>[Round "3"]
>[White "Robertsen,Thomas"]
>[Black "Nikolaisen,Magnar"]
>[ECO "B86"]
>[Result "1-0"]
>1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bc4
>e6 7. Bb3 Be7 8. O-O O-O 9. Qf3 Qc7 10. Qg3 Nh5 11. Qh3 Nf6
>12. Qg3 Nh5 13. Qf3 Nf6 14. g4 Nbd7 15. g5 Ne5 16. Qh3 Nfd7
>17. f4 Qc5 18. Be3 Nc4 19. Bf2 Qc7 20. Nf5 Ndb6 21. Nxg7
>Kxg7 22. Kh1 f6 23. Qh6+ Kf7 24. Qh5+ Kg8 25. g6 hxg6
>26. Qxg6+ Kh8 27. Qh6+ Kg8 28. Rg1+ Kf7 29. Qg6# 1-0
>
>White plays 21 the strongest move 21. Nxg7!!
>
>[D]r1b2rk1/1pq1bppp/pn1pp3/5NP1/2n1PP2/1BN4Q/PPP2B1P/R4RK1 w - -
>
>Forced Variation:
>
>
>1. Nxg7! Kxg7 2. Qh6+! Kg8 (Kh8? and now 3. Bd4! ++-) und now
>3. Kh1 !!
>
>After this forced moves all programs says that the position is clearly better
>for white!
>
>Here a Analysis by Fritz 7 after 3. Kh1!
>
>[D]r1b2rk1/1pq1bp1p/pn1pp2Q/6P1/2n1PP2/1BN5/PPP2B1P/R4R1K b - - 0 1
>
>Analysis by Fritz 7:
>3...d5 4.f5 f6 5.gxf6 Lxf6 6.Tg1+ Lg7 7.Txg7+ Dxg7 8.Tg1 Dxg1+ 9.Kxg1
>+- (1.53) Tiefe: 9/35 00:00:52 14801kN
>3...Sd7!
>+- (1.50) Tiefe: 9/35 00:00:53 15262kN
>3...Sd7!
>± (1.34) Tiefe: 9/35 00:00:54 15318kN
>3...Sd7!
>± (1.03) Tiefe: 9/35 00:00:54 15361kN
>3...Sd7!
>² (0.41) Tiefe: 9/35 00:00:54 15467kN
>3...Sd7 4.f5 Te8 5.g6 hxg6 6.fxg6 Sf6 7.gxf7+ Kxf7 8.Lh4
>= (0.06) Tiefe: 9/35 00:00:56 16117kN
>3...Sd7--
>² (0.34) Tiefe: 10/30 00:01:03 17927kN
>3...Sd7 4.f5 exf5 5.Sd5 Dd8 6.exf5 b5 7.Lxc4 Lxg5 8.Tg1 bxc4 9.Txg5+ Kh8
>± (1.28) Tiefe: 10/33 00:01:09 19552kN
>3...Te8!
>± (1.25) Tiefe: 10/33 00:01:12 20471kN
>3...Te8 4.Ld4 Lf8 5.Df6 e5 6.Lxb6 Sxb6 7.g6 d5 8.gxf7+ Dxf7 9.Dxb6
>± (1.12) Tiefe: 10/33 00:01:13 20951kN
>3...Td8!
>± (1.09) Tiefe: 10/35 00:01:30 25957kN
>3...Td8 4.Ld4 Lf8 5.Df6 e5 6.Lxb6 Sxb6 7.Lxf7+ Dxf7 8.Dxd8 Sc4 9.Sd5 exf4
>10.Txf4
>± (1.09) Tiefe: 11/33 00:01:57 33850kN
>3...Td8 4.Ld4 Lf8 5.Df6 e5 6.Lxb6 Sxb6 7.Lxf7+ Dxf7 8.Dxd8 Sc4 9.fxe5 De7
>10.Dxe7 Lxe7
>± (1.19) Tiefe: 12/33 00:03:12 56084kN
>3...Td8 4.Ld4 Lf8 5.Df6 e5 6.Lxb6 Sxb6 7.Lxf7+ Dxf7 8.Dxd8 Sc4 9.fxe5 De7
>10.Dxe7
>± (1.19) Tiefe: 13/38 00:06:47 120048kN
>3...Td8 4.Ld4 Lf8 5.Df6 e5 6.Lxb6 Sxb6 7.Lxf7+ Dxf7 8.Dxd8 Sc4 9.Sd5 Sd2
>± (1.00) Tiefe: 14/40 00:14:30 258607kN
>(Nemeth, Stuttgart 11.04.2002)
>
>My question now: which programm can find the strong tactical move 21. Nxg7 ?
>
>Eduard

Chessmaster doesn't find it in a reasonable amount of time, but it is fairly
happy about Nxe7+:

Time	Depth	Score	Positions	Moves
0:00	1/3	0.74	5177		1.Nxe7+ Qxe7 2.Rad1 Bd7 3.a4 Bc6
0:00	1/4	0.73	22058		1.Nxe7+ Qxe7 2.Rfd1 e5 3.Qd3 Be6
					4.Bxb6 Nxb6 5.Qxd6
0:01	2/5	0.78	60169		1.Nxe7+ Qxe7 2.Bxc4 Nxc4 3.b3 e5
					4.Qd3 Nb2 5.Qg3
0:04	2/6	0.77	220195		1.Nxe7+ Qxe7 2.a4 e5 3.Qh5 exf4
					4.a5 g6
0:13	3/7	0.67	769235		1.Nxe7+ Qxe7 2.a4 e5 3.Qh5 exf4
					4.a5 g6 5.Qh4
0:36	3/8	0.79	2274414		1.Nxe7+ Qxe7 2.a4 Qc7 3.a5 Nd7
					4.Bxc4 Qxc4 5.Rad1 Qc7 6.Rfe1 b6
2:12	4/9	0.81	8350853		1.Nxe7+ Qxe7 2.a4 Qc7 3.a5 Nd7
					4.Bxc4 Qxc4 5.Rfd1 Qc7 6.Ra4 b6
9:10	4/10	0.69	35347127	1.Nxe7+ Qxe7 2.a4 Qc7 3.a5 Nd7
					4.Bxc4 Qxc4 5.Rfd1 Qc7 6.Ra4 b5
					7.axb6ep Nxb6

jm



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