Ed: Great problem, thank you. After about five minutes I found a solution which includes the 10, 17, 15, and 13 squares as corner placements. Bob Wainwright -------------------------- clockwise, with corners in bold I get 17,16,13,11,15,14,7,10,12 Brian ---------------------------------- The corner squares are 17 13 10 and 15. Some parts of my fill must be different than yours because I got different groups of leftover squares. Joseph DeVincentis