So what are the rules allowing squares to cover one (or more) x?

update

OK I misread that line 12 is empty, so a square is either empty or has an x in the upper left corner.

You are filling max squares first left to right and then up to down.

Cheers Rolf
(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery FootballPerl is like chess, only without the dice

In reply to Re^2: Tricky math problem ... by LanX
in thread Tricky math problem ... by baxy77bax

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