Posted by Ben C on 03/29/07 20:57

On 2007-03-29, dorayme <doraymeRidThis@optusnet.com.au> wrote:
[...]
>> >If you want a chess puzzle (and the graphic is not so bad), look
>> >at:
>> >
>> ><http://members.optushome.com.au/droovies/binHassad/missingKing.ht
>> >ml>

I give up.

I figure the white king must have been on either b3 or c2 since as
things stand the black king is in check. The white bishop attacking it
can only have got where it is along that same diagonal, and the black
king can't have moved into check. So something must have moved off that
diagonal opening the attack.

The white king couldn't have been on c2, since there is no way two kings
can end up on adjacent squares-- to move a king next to another king is
to move it into check, which is illegal.

That leaves b3, from where it moved to either a3 or c3 out of check
itself and checking black. But it is not possible for it to have got
into the situation on b3 attacked by both the rook and bishop in the
first place, since they can't both have got there in a single move.

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