@Don Kirkby have designed a set of dominoes puzzles that they call Donimoes. You slide the dominoes like the cars in Nob Yoshigahara's Rush Hour puzzle, always along their long axis.
I have altered this puzzle by changing numbers to letters.
The Blocking Puzzle's Goal
The goal is to slide all the dominoes into a rectangle, without sliding any matching numbers next to each other.
Move a domino one space along its long axis so that none of its letters match an adjacent letters on a neighbouring domino.
All the dominoes in the puzzle have to be connected in one solid group, diagonal connections don't count. When you move a domino, it can be disconnected during the move, as long as it is connected at the start and the end of the move. Remember that it can only move one space at a time, though.
1) There may be more than one solutions. The one that I am looking for will form something special.
2) The two "CO" tiles have been named as "CO1 and CO2" for your convenience. Stay calm - they are not harmful nor toxic :P