Survo puzzles: www.survo.fi/puzzles --------------------------------------- Copyright (c) Survo Systems 2006-2013 The easiest way to solve these three problems may be using a Java Applet http://www.survo.fi/swap/puzzles.html based on the swapping method. Survo puzzle 318/2013 (30) #252-17715 A B C D E 1 * * * * * 37 2 * * * * * 18 14 10 4 11 16 Survo puzzle 319/2013 (50) #262-79095 A B C D E F 1 * * * * * * 26 2 * * * * * * 52 21 5 15 17 9 11 Survo puzzle 320/2013 (270) #272-3542 A B C D E F G 1 * * * * * * * 69 2 * * * * * * * 36 8 22 10 19 24 7 15