Author: Roy Brunjes
Date: 05:43:37 05/08/03
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 Here is what CM9000 SKR sees on my P4 1.8 GHz with 64 MB hash: Time Depth Score Positions Moves 0:07 1/9 1.24 1016041 1.Nxf7 Kxf7 2.g4 Bh7 3.Qxe6+ Ke8 4.Qf7+ Kd8 5.Rhe1 g5 6.Ne4 b5 7.Qg7 0:15 1/9 1.29 2050760 1.Bf4 g5 2.g4 Bxg4 3.Qxg4 Ngf6 4.Nxf7 Nxg4 5.Bxc7 Kxf7 0:37 1/10 1.43 5000655 1.Bf4 g5 2.g4 gxf4 3.gxf5 Nxe5 4.dxe5 b5 5.f6 bxc4 6.fxe7 Nxe7 1:53 1/11 1.44 15998575 1.Bf4 g5 2.g4 gxf4 3.gxf5 Nxe5 4.dxe5 b5 5.fxe6 bxc4 6.Qxc4 f5 7.Rhe1 5:06 1/12 1.54 44959112 1.Bf4 Bg5 2.Bxg5 Nxe5 3.dxe5 hxg5 4.g4 Bg6 5.Qd2 Qxe5 6.Qd7+ Kf8 7.Qxb7 Qf4+ 8.Kb1 Re8 9.Qxc6 Qxf2 It is pretty sure it doesn't like Nxf7 after 15 seconds. I have not analyzed the position myself to see what might be happening (and not happening!) in the position, so I cannot comment on the correctness or incorrectness of Nxf7. Roy
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