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Thanks
Re: the thematic words this is a very useful page http://en.wikipedia.org/wiki/Algebraic_notation_(chess)

This one is also useful and got me over the line (I think)

http://www.shakki.net/kerhot/KemTS/nap-pieces.htm

Thanks for your help with the SPONGEBAG clue, I think it's a bit of a weak clue to use the BAG bit as part of the anagram. Not sure I would ever have got there without that!