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Subject: Re: Tactical test position (Nxf7)

Author: Aaron Gordon

Date: 15:20:01 05/09/03

Go up one level in this thread


On May 08, 2003 at 08:21:19, Dennis Breuker wrote:

>In a game I played last Tuesday, the following position occurred:
>
>[D] r3k1nr/ppqnbpp1/2p1p2p/4Nb2/2BP4/2N5/PPPBQPPP/2KR3R w kq - bm Nxf7
>
>Solution:
>11.Nxf7 Kxf7 12.g4 Bh7 13.Qxe6+ Ke8 14.Rhe1 (other moves might work
>as well). White is winning here. Black only has passive pieces,
>and all White's pieces are developed.
>
>  In the game I played first
>11.g4,
>  but that is wrong, since Black can play 11..Nxe5.
>  Luckily, Black played
>11..Bh7?,
>  and after
>12.Nxf7
>  the variation above is reached.
>
>  My game continued
>12..Kxf7 13.Qxe6+ Ke8 14.Rhe1 Kd8 15.Qf7!
>  (15.d5 also good)
>15..Qd6
>  (on 15..g5 there follows 16.d5 cxd5
>    [16..Ne5 17.Rxe5! Qxe5 18.dxc6 Kc7 19.Nd5+ Kxc6 20.Bc3]
>  17.Bxd5)
>16.Re6 Qb4 17.Bb3! and Black resigned.
>  (On 17..Qb6 there follows 18.d5!)
>
>Does your engine find the move, and the right continuation?
>
>It looks like some engines want to take on f7, but after
>11..Kxf7 12.g4 Bh7 13.Qxe6+ Ke8 suddenly think it is not
>as good as the engine hoped for...
>
>It seems that Fritz(6) does not want to take on f7,
>but it definitely is the winning move!
>
>Regards,
>Dennis

Analysis by Shredder 7.04:

1.Nxd7 Qxd7
  ²  (0.41)   Depth: 1/2   00:00:00
1.g4 Nxe5 2.Kb1
  ±  (1.04)   Depth: 5/12   00:00:00
1.g4 Nxe5 2.Kb1
  ±  (1.04)   Depth: 5/12   00:00:00
1.g4 Nxe5 2.Kb1
  ±  (1.04)   Depth: 5/12   00:00:00
1.g4 Nxe5 2.Kb1
  ±  (1.04)   Depth: 5/12   00:00:00
1.g4 Nxe5 2.Kb1
  ±  (1.04)   Depth: 5/12   00:00:00
1.g4 Nxe5 2.Kb1
  ±  (1.04)   Depth: 5/12   00:00:00
1.g4 Nxe5 2.Kb1
  ±  (1.04)   Depth: 5/12   00:00:00
1.g4 Nxe5 2.Kb1
  ±  (1.04)   Depth: 5/12   00:00:00
1.g4 Nxe5 2.Kb1
  ±  (1.04)   Depth: 5/12   00:00:00
1.g4 Nxe5 2.dxe5 Qb6 3.gxf5 Qxb2+ 4.Kxb2
  ±  (1.04)   Depth: 5/15   00:00:00
1.Bf4 Nxe5 2.dxe5 Bb4 3.g4 Qd7
  ±  (1.05)   Depth: 5/15   00:00:00
1.Bf4 Bg5 2.Bxg5 hxg5 3.Ne4 Nxe5 4.dxe5 Qxe5
  ±  (1.39)   Depth: 5/15   00:00:00
1.Nxf7 Rd8 2.Nxh8
  ±  (1.40)   Depth: 5/15   00:00:00
1.Nxf7 Kxf7 2.g4 Bh7 3.Qxe6+ Ke8
  +-  (1.49)   Depth: 5/15   00:00:00
1.Nxf7 Kxf7 2.g4 Bh7 3.Qxe6+ Ke8 4.Rde1 Kf8 5.f4
  +-  (1.74)   Depth: 6/18   00:00:00
1.Nxf7 Kxf7 2.g4 Bh7 3.Qxe6+ Ke8 4.Rde1 Nb6 5.Bb3
  +-  (1.81)   Depth: 6/20   00:00:00
1.Nxf7 Kxf7 2.g4 Bh7 3.Qxe6+ Ke8 4.Rde1 Kd8 5.Qxh6 gxh6
  +-  (1.56)   Depth: 7/24   00:00:00  91kN
1.Nxf7 Kxf7 2.g4 Bh7 3.Qxe6+ Ke8 4.Qf7+ Kd8 5.Qxg7 Bf6 6.Qf7 Bxd4
  +-  (1.48)   Depth: 7/24   00:00:00  123kN
1.Nxf7 Kxf7 2.g4 Bh7 3.Qxe6+ Ke8 4.Qf7+ Kd8 5.Rde1 g5 6.Kb1 Qb6
  ±  (1.30)   Depth: 8/24   00:00:00  383kN
1.Bf4 Nb6 2.g4 Bh7 3.Ng6 Bg5 4.Bxg5 hxg5
  ±  (1.31)   Depth: 8/24   00:00:01  601kN
1.Bf4 g5 2.Bg3 Bd6 3.Ne4 Bxe4 4.Qxe4 Ngf6 5.Qf3 Nxe5 6.Qxf6
  +-  (1.51)   Depth: 8/24   00:00:01  845kN
1.Bf4 Bd6 2.g4 Bh7 3.Kb1 Nxe5 4.Bxe5 Kf8 5.Bxd6+ Qxd6 6.Qe4 Bxe4
  ±  (1.26)   Depth: 9/26   00:00:03  1535kN
1.Bf4 Bd6 2.g4 Bh7 3.Kb1 Nxe5 4.dxe5 Bb4 5.Ne4 Rd8
  ±  (1.22)   Depth: 9/26   00:00:03  1611kN
1.Bf4 g5 2.Bg3 Bd6 3.h4 Nb6 4.Bd3 Bh7
  ±  (1.39)   Depth: 10/28   00:00:07  3369kN
1.Bf4 Nxe5 2.Bxe5 Qa5 3.Bxg7 Rh7 4.Qe5 Qxe5 5.Bxe5 0-0-0 6.Rhe1 Nf6
  ±  (1.39)   Depth: 11/33   00:00:12  5825kN
1.Bf4 Bg5 2.Bxg5 Nxe5 3.dxe5 hxg5 4.Qe3 Ne7 5.Qxg5 0-0 6.Bxe6 fxe6 7.Qxg7+
  ±  (1.14)   Depth: 12/35   00:00:27  12641kN
1.Bf4 Bg5 2.Bxg5 Nxe5 3.dxe5 hxg5 4.Bd3 0-0-0 5.Bxf5 exf5 6.Rxd8+ Qxd8 7.Rd1 Qe7
8.h3 Kb8 9.Qe3
  ±  (1.10)   Depth: 12/35   00:00:31  14500kN
1.Bf4 Bg5 2.Bxg5 Nxe5 3.dxe5 hxg5 4.Qe3 Ne7 5.Qxg5 0-0 6.g4 Bg6 7.Rd6 Rad8
8.Rhd1
  ±  (1.22)   Depth: 13/33   00:01:02  28755kN
1.Bf4 Bg5 2.Bxg5 Nxe5 3.dxe5 hxg5 4.Qe3 Ne7 5.Qxg5 0-0 6.g4 Bg6 7.f4 Nd5 8.Bxd5
cxd5 9.Qh4
  ±  (0.98)   Depth: 14/39   00:02:01  56556kN
1.Nxf7 Kxf7 2.g4 Bh7 3.Qxe6+ Ke8 4.Qf7+ Kd8 5.Rhe1 Qd6 6.Re6 Qb4 7.Bb3 Qxd4
8.Bxh6 Kc8 9.Rxd4 Bg5+
  ±  (0.99)   Depth: 14/39   00:02:16  63849kN
1.Nxf7 Kxf7 2.g4 Bh7 3.Qxe6+ Ke8 4.Qf7+ Kd8 5.Rhe1 g5 6.f4 Nb6 7.Bb3 Nf6 8.fxg5
Bg8 9.Qg7 Rh7 10.Rxe7
  ±  (1.07)   Depth: 14/39   00:02:55  83081kN
1.Nxf7 Kxf7 2.g4 Bh7 3.Qxe6+ Ke8 4.Qf7+ Kd8 5.Rhe1 g5 6.d5 cxd5 7.Bxd5 Ndf6
8.Bxg5 Qb6 9.Bxf6 Qxb2+ 10.Kxb2
  ±  (1.32)   Depth: 15/41   00:03:54  109803kN
1.Nxf7 Kxf7 2.g4 Bh7 3.Qxe6+ Ke8 4.Qf7+ Kd8 5.Rhe1 g5 6.d5 Ne5 7.Rxe5 Qxe5
8.dxc6 Qxh2 9.Bxg5+ Kc7
  +-  (1.82)   Depth: 15/44   00:05:37  157453kN
1.Nxf7 Kxf7 2.g4 Bh7 3.Qxe6+ Ke8 4.Qf7+ Kd8 5.Rhe1 b5 6.Be6 b4 7.Ne4 Bxe4 8.Rxe4
Ngf6 9.Ree1 g5 10.Bf5
  +-  (1.97)   Depth: 15/44   00:07:15  203606kN
1.Nxf7 Kxf7 2.g4 Bh7 3.Qxe6+ Ke8 4.Qf7+ Kd8 5.Rhe1 b5 6.Be6 Ngf6 7.Qxg7 Re8
8.Bf7 Rf8 9.Bxh6 Qxh2 10.Be6 Rg8 11.Bxg8
  +-  (2.15)   Depth: 16/46   00:11:27  325490kN
1.Nxf7 Kxf7 2.g4 Bh7 3.Qxe6+ Ke8 4.Qf7+ Kd8 5.Rhe1 Ndf6 6.Qxg7 Ne8 7.Qxh8 Bf6
8.Qxg8 Bxg8 9.Bxg8 Qxh2 10.Re2 Qh3 11.Rde1
  +-  (1.99)   Depth: 17/48   00:22:50  660256kN
1.Nxf7 Kxf7 2.g4 Bh7 3.Qxe6+ Ke8 4.Qf7+ Kd8 5.Rhe1 Ndf6 6.Qxg7 Ne8 7.Qxh8 Bf6
8.Qxg8 Bxg8 9.Bxg8 Qxh2 10.Ne4
  +-  (2.20)   Depth: 18/50   00:45:03  1301285kN



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