Survo puzzles: www.survo.fi/puzzles --------------------------------------- Copyright (c) Survo Systems 2006-2011 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 246/2011 (15) #443-2734 A B C D 1 14 * * * 54 2 * 2 * 10 25 3 3 * 4 * 15 4 * * 12 * 42 33 18 39 46 Survo puzzle 247/2011 (470) #443-66956 A B C D 1 * * * * 52 2 * * 13 * 37 3 * * * * 28 4 * * * * 19 51 24 43 18 Survo puzzle 248/2011 (1100) #443-88690 A B C D 1 * * * * 19 2 * * * * 46 3 * * * * 39 4 * * * * 32 14 53 25 44