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Subject: Re: Mate in 9

Author: Heiner Marxen

Date: 08:54:05 03/10/02

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On March 09, 2002 at 11:48:58, Art Basham wrote:

>In this test, black playes Rd2 and soon mates!
>My SOS-Arena engine found this in less than a second!
>(I am very impressed with the speed of this new engine!)
>
>Little Goliath (V3) finds it in just 3 sec...!
>
>Also, this move is a good test for portable units.
>
>My Novag Amber finds this move (...Rd2) in about 30 seconds...!
>(very good for a small portable)..!
>Novag Scorpio in about 2:20...
> Novag Super Forte 6 in  about 12 min.  etc.
>
>[D]3r1k2/1R2npp1/p3p3/8/B3P3/2p3p1/PP4P1/R4KNr b - -

Chest confirms, that 1.Rd2 is the shortest solution (mate in 9) and is unique.
Here is Chest's PV (8.6 minutes on K7/600 350MB hash):

PV: Rd2 Rb8+ Nc8 Rxc8+ Ke7 Re8+ Kf6 Rxe6+ fxe6 e5+ Kf7 Be8+ Kxe8 b3 Rf2+ Ke1
Rxg1#

Cheers,
Heiner



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