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Subject: Re: "Easy" Positional Test Suite

Author: Mike S.

Date: 11:36:27 12/28/01

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On December 28, 2001 at 06:09:38, Rafael Andrist wrote:

>On December 27, 2001 at 22:48:09, Mike S. wrote:
>
>>(...)
>>7k/4K1n1/8/6P1/8/3B4/8/8 w - - bm Bg6; id "Mike's Test 2.2, Nr. 28";
>>8/p2Q2p1/1k3qbp/1pn5/2p4P/2P2P2/5BPK/5B2 w - - bm g3; id "Mike's Test 2.2, Nr.
>>30";

>Thanks, it's a nice collection, but Nr. 28 is more a tactical one.
>Question to Nr. 30: should White have any winning chances after g3? My program
>prefers Bxc5+ and shows 0.00 with perpetual check and if I play g3 it also goes
>for a perpetual check.

In #28 White must use a very basical idea: To reduce the opponents
maneuverability. 1.Bg6 is the only move which stops Black's knight from jumping
around forever. Programs which understand that Black's knight should be caged
here, will solve that faster.

#30 is difficult, but the idea behind it is simple again: Direct another piece
towards the enemy king, to support the Queen. 1.g3/Bg2/f4. In some variations,
this creates a mate threat Qb7#. Some examples:

1.g3!! a5
[1...Qxf3 2.Bxc5+ Kxc5 3.Qd4+ Kc6 4.Bg2;
1...Bf5 2.Qd5 Qf8 3.Bg2]
2.Bg2 Qc6 3.Qd8+ Ka6 4.Qe7 b4
[4...Kb6 5.f4 Qc8 6.Bxc5+ Qxc5 7.Qb7#;
4...Nd7 5.f4 Qc7 6.Qe6+]
5.Bxc5 1-0

White wins.

Regards,
M.Scheidl



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