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Pseudo coup

All Penny had to do this week was fill in the missing numbers so that each row, each column and each three-by-three square all had each of the numbers 1 to 9. In printing out the puzzle Joe had interchanged some of the three-by-three squares. Penny worked out which and filled in all the missing numbers. What number did Penny place in the small shaded square?

WIN £15 will be awarded to the sender of the first correct answer opened on Wednesday 19 May. The Editor’s decision is final. Please send entries to Enigma 1591, New ÐÓ°ÉÔ­´´, Lacon House, 84 Theobald’s Road, London WC1X 8NS, or to enigma@newscientist.com (please include your postal address).

Answer to 1585 Diving Points: The number is 6290

The winner Peter Topping of Largs, Ayrshire, UK