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 150/2009 (40) #442-85530 A B C D 1 * 9 * * 44 2 3 * * 4 10 3 * 6 5 * 26 4 * * * * 56 36 30 28 42 Survo puzzle 151/2009 (250) #443-21366 A B C D 1 * 15 9 * 42 2 * * * * 45 3 * * * * 22 4 * * * * 27 14 55 26 41 Survo puzzle 152/2009 (610) #443-73064 A B C D 1 * * * * 26 2 * * 15 * 55 3 * * * * 44 4 * * * * 11 38 23 42 33