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 321/2013 (1000) #443-32324 A B C D 1 * * * * 34 2 * * * * 23 3 * * * * 29 4 * * * * 50 32 41 11 52 Survo puzzle 322/2013 (1400) #443-59825 A B C D 1 * * * * 48 2 * * * * 16 3 * * * * 39 4 * * * * 33 51 40 32 13 Survo puzzle 323/2013 (700) #443-76875 A B C D 1 15 * * * 50 2 * * * * 47 3 * * * * 13 4 * * * * 26 46 39 32 19