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Subject: Re: Difficult position

Author: Hans Havermann

Date: 07:54:17 05/02/99

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On May 01, 1999 at 19:10:59, James Robertson wrote:

>Today I reached this position in a game on FICS:

>r1b4r/1p1pk1pp/p1n1p3/4qp1Q/4B3/2N1P3/PPP3PP/R4RK1 w - -

>Is there any
>program (none I tried on my machine could do it) that plays 16. Bxf5, or that
>avoids 16. ... exf5? Also, is there a refutation for my sacrifice I might have
>missed?

MacChess sees white (through 15-ply) as losing:

08/01|00:00:10|     2801140|  -67| Qg5+ Kf7 Bxc6 dxc6 e4 h6 Qc1 Bd7 exf5 Qd4+
Rf2 exf5
08/27|00:00:19|     5445091|  -65| Bxc6 Qxe3+ Kh1 dxc6 Rae1 Qd4 Rxf5 Bd7 Rf7+
Kd6 Rd1
09/01|00:00:50|    13836149|  -62| Bxc6 dxc6 e4 g6 Qh4+ Kf7 exf5 exf5 Rad1 Be6
Qd4 Qxd4+ Rxd4
10/01|00:01:43|    28595067|  -61| Bxc6 dxc6 e4 g6 Qh4+ Kf7 exf5 exf5 Qf2 Be6
Rae1 Qf6 Rd1
11/01|00:05:03|    70910886|  -61| Bxc6 dxc6 e4 g6 Qh4+ Ke8 exf5 gxf5 Qh5+ Kd8
Rad1+ Bd7 Qh4+ Kc7 Qf4 Qxf4 Rxf4
12/01|00:15:31|   243559190|  -61| Bxc6 dxc6 e4 g6 Qh4+ Qf6 Qxf6+ Kxf6 exf5 gxf5
Rad1 e5 Ne4+ Kg6 Rd6+ Kf7 Ng5+ Ke7 Rdd1
13/01|00:44:37|   727510616|  -61| Bxc6 dxc6 e4 g6 Qh4+ Qf6 Qxf6+ Kxf6 exf5 gxf5
Rad1 e5 b3 h6 Ne4+ Kg6 Rd6+ Kg7 Nf6
13/34|02:16:29|  2240153231|  -50| Bxf5 exf5 Rxf5 Qxe3+ Kf1 Kd8 Nd5 Qh6 Qf7 Re8
Qxe8+ Kxe8 Re1+ Qe6 Nc7+ Kd8 Nxe6+ dxe6 Rf7 Nb4 Rxg7 Nxc2
14/01|05:01:12|  4776514669|  -33| Bxf5 Qxe3+ Kh1 Qh6 Qxh6 gxh6 Rae1 Rb8 Rf4 Ke8
Rh4 Ne7 Bd3 Ng8 Bc4 Ra8
15/01|10:50:04| 10509393342|  -28| Bxf5 Qxe3+ Kh1 Qh6 Qxh6 gxh6 Rae1 Rb8 Bd3 Nb4
Be4 d6 a3 Nc6 Bxc6 bxc6 b3 Bb7



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