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 228/2011 (50) #343-41302 A B C D 1 11 * * * 35 2 * * * * 18 3 * * * * 25 23 31 7 17 Survo puzzle 229/2011 (60) #343-57840 A B C D 1 * * * * 27 2 * 4 * * 13 3 * * 11 * 38 17 26 25 10 Survo puzzle 230/2011 (125) #343-20908 A B C D 1 * * * * 26 2 * * * * 16 3 * * * * 36 23 31 14 10