Archive 2001-2002 The Starter Problem
 
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The Starter Problem
Written by Brian Stephenson   

In this solution, the move that was required is given in bold type. All else is given for the sake of completeness and for the interest of solvers. Threats are given in parentheses. The symbol 'S' stands for knight.

John Rice

5Q2/8/2K5/4p1p1/5qR1/1B3k1P/3R1pS1/8

White to play and mate in 2 against any defence

1.Qa3!  (2.Bd5#)

1...Ke4  2.Bc2# (set 2.Bd5#)
1...Qf6+ 2.Be6# (set 2.Qxf6#)
1...Qc4+ 2.Bxc4#
1...Qa4+ 2.Bxa4#
1...Qe3  2.Bd1#
1...Qxd2 2.Bd1#
1...e4   2.Bd1#

There are the following ‘tries’, given by solvers, defeated as noted:

ClaimRefutation(s)
1.Bd5+? 1...e4! 2.Bxe4?? Kxe4!!
1.Kd5? 1...f1=Q!
1.Bd1+? 1...Ke4! 2.Qd5?? Kf5!!
1.Qxf4+? 1...gxf4!
1.Qf5? 1...f1=Q!
1.Bc2? 1...f1=Q! or 1...f1=S!
1.Rxg5? 1...f1=Q!, 1...f1=S!, 1...Qf6+!, 1...Qf7! or 1...Qxf8!
1.Bc4? 1...f1=Q! or 1...f1=S!
1.Qb4? 1...f1=Q!, 1...Qe3!, 1...Qc4+! or 1...Qf6+!
 
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