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Subject: MacChess finds Nf6+ (eval +125) in under 10 minutes

Author: Richard A. Fowell

Date: 20:54:40 03/18/02

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On March 18, 2002 at 18:17:38, Art Basham wrote:

[D]r1bq1rk1/1p2bppp/p3p3/n3P3/4N3/1P1P1N2/PB4PP/R3QR1K w - -
>
>White played Nf6+...!! ...if gxf6, 2. Qg3+ etc,
>
>It took my old Mach 3 about 3 hrs. to find this one...
>
>from the Encl. of Middle Games

Clearly, the best result to date is the test version of
Chessmaster 9000 (see Merlino post), but MacChess does
pretty well on this position.

MacChess finds this in under 10 minutes on a 867 MHz Mac G4.

Here's MacChess's analysis from 1 second on - although it picks
Nf6+ at 37 seconds, you can see form the eval that
it doesn't really understand that it is a great move until
just under 10 mintues, at ply 13.

MacChess is freeware for the Macintosh -
download link, manual, other Mac chess software links at:
http://members.aol.com/macchess/

Ply    Time        Nodes     Eval   Principal Variation
================================================================
08/01|00:00:01|      615415|  -14| Nd6 Nc6 Nxc8 Rxc8 d4 Qd5 Rc1 Nb4 Rxc8 Rxc8
09/01|00:00:04|     2813229|  -13| Nd6 Nc6 Nxc8 Rxc8 Qe4 Nb4 d4 b5 a4 Nd5
10/01|00:00:12|     8493362|  -14| Nd6 Nc6 Nxc8 Rxc8 Qe4 Nb4 d4 b5 a4 Qd5 Qe3
10/42|00:00:37|    26144738|  +13| Nf6+ gxf6 exf6 Bxf6 Bxf6 Qxf6 Qxa5 b5 Qc7
11/01|00:00:57|    39658250|  +12| Nf6+ gxf6 exf6 Bxf6 Bxf6 Qxf6 Qxa5 b5 Qc7
12/01|00:02:10|    89366065|  +15| Nf6+ gxf6 exf6 Bxf6 Bxf6 Qxf6 Qxa5 Qg6 d4
13/01|00:09:53|   405278381| +125| Nf6+ gxf6 exf6 Bxf6 Qg3+ Kh8 Ne5 Nxb3 Rxf6
14/01|00:21:52|   895772409| +133| Nf6+ gxf6 exf6 Bxf6 Qg3+ Kh8 Ne5 Bd7 Rxf6
Qxf6 Qf2 Qg7 Nxd7 e5 Bxe5 f6 Nxf8 fxe5



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