Yeah, I think I found a partial solution at least. It would appear that two of the conditionals that would allow the return of a properly placed ship was faulty. In 'sub place_ship' there's a line that reads:
return 0 if $x<0 or $y<0 or $x>9 or $y>9;
Changing it to:
return 0 if $x<0 or $y<0 or $x>10 or $y>10;
That seems to work.
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