Survo puzzles: www.survo.fi/puzzles --------------------------------------- Copyright (c) Survo Systems 2006-2008 The easiest way to solve these three problems may be using a new Java Applet http://www.survo.fi/swap/puzzles.html based on the swapping method. Survo puzzle 156/2009 (15) #442-13198 A B C D 1 * 7 * 5 25 2 * * 3 * 38 3 13 * * * 30 4 * * * 10 43 56 41 10 29 Survo puzzle 157/2009 (160) #443-8514 A B C D 1 * * * * 23 2 * 11 * * 33 3 * * 10 * 43 4 * * * * 37 54 44 28 10 Survo puzzle 158/2009 (880) #444-91618 A B C D 1 * * * * 30 2 * * * * 44 3 * * * * 24 4 * * * * 38 11 29 57 39