Here is one of the older sliding puzzles:

You have a sliding puzzle that looks like this:

AB
 C
DE

You may move a block with a letter on it to the blank space by sliding it there. How many moves does it take to put D where E is and E where D is at the same time? (The other pieces don't need to be in their original spots.)

AB  AB  AB  AB  AB  AB  AB  AB  AB  AB  AB
C   DC  DC  D   DE  DE  D    D  CD  CD  C 
DE   E  E   EC   C  C   CE  CE   E  E   ED

     1   2   3   4   5   6   7   8   9  10

EDIT: You're right, Erik O. I missread the question.

Edited on June 10, 2004, 8:52 am

Posted by Danny on 2004-06-10 08:27:11