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Subject: Re: Is this Mate in 17 or Mate in 20 ?

Author: John Merlino

Date: 17:58:56 10/11/03

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On October 11, 2003 at 19:23:53, Jorge Pichard wrote:

>Ruffian announced Mate in 17 against itself and Smarthink evaluation stated Mate
>in 20, before Ruffian Resigned.
>
>[D]8/8/3k4/3p4/8/1P2K3/7P/8 b - -

It is a mate in 15 if Black plays Ke5 or Kc5. It is a mate in 14 if Black plays
anything else. This is easily determined by looking at the 5-piece EGTBs (if you
have them). Here is one possible ending:

[Event ""]
[Site ""]
[Date "2003.10.11"]
[Round ""]
[White "Chessmaster"]
[Black "Chessmaster"]
[TimeControl "600"]
[Result "1-0"]
[Setup "1"]
[FEN "8/8/3k4/3p4/8/1P2K3/7P/8 b - - 0 1"]

1...Kc5 2.h4 d4+ 3.Kd3 Kd6 4.b4 Ke7 5.b5 Kd6 6.h5 Ke7 7.b6 Kd6 8.h6 Kd7
9.h7 Kc6 10.h8=Q Kxb6 11.Qf6+ Kc7 12.Kc4 d3 13.Kc5 d2 14.Qe7+ Kb8 15.Kb6
d1=Q 16.Qb7# 1-0

jm



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