Tristram, that was a very evocative comment on what has certainly been, by a considerable margin, the toughest so far this year. I hope dear Mr Alekhine is happy now (dare I suggest that solving this would be far more enjoyable than serenading us in Lowland Scots, dear Alekhine - said with a smile, I promise!) I have a few loose ends to wind up and, for one dreadful moment, thought this was the trimestrial numerical - but it was not to be. Thank you, Sabre - I think Knights' moves might have been light relief in comparison.