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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, ¿ìè¶ÌÊÓƵ, 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