I've designed a set of dominoes puzzles that I call Donimoes. You slide the dominoes like the cars in Nob Yoshigahara's Rush Hour puzzle, always along their long axis. The goal of Unmatched Donimoes is to slide all the dominoes into a rectangle, without sliding any matching numbers next to each other. See Monday's problem for complete rules and and an example solution.

Today's problem is a little bigger and a little harder. Good luck, and post your solution as an answer.

starting position

If you like this puzzle, watch for new problems every day this week.

  • $\begingroup$ I think I have a solution, but how in the world do I recreate that image? Did you use a certain software or what? $\endgroup$
    – Cubemaster
    Commented Jul 23, 2019 at 15:06
  • 1
    $\begingroup$ I wrote a Python program, @Cubemaster, and you could download it. It's probably not worth the effort, though, when you can just list the moves as I did in Monday's example. $\endgroup$
    – Don Kirkby
    Commented Jul 23, 2019 at 15:24

2 Answers 2


I think the following would work

25R 03R 42R 34R 25R 03R 42R 34R 25R 03R 42R 34R 05R 25R 03R 42R 34R 05R 25R 33D


Don't know how to do this visually, but I think the solution is:

25R, 03R, 42R, 34R, 25R, 03R, 42R, 05R, 34R, 25R, 03R, 42R, 34R, 05R, 33D

For a total of 15 moves

  • $\begingroup$ If I understand correctly, I think your first move is disallowed. "All the dominoes in the puzzle have to be connected in one solid group, diagonal connections don’t count." $\endgroup$
    – hexomino
    Commented Jul 23, 2019 at 15:18
  • $\begingroup$ Whoops, didn't notice that part. Makes it slightly more complicated $\endgroup$
    – Cubemaster
    Commented Jul 23, 2019 at 15:18
  • $\begingroup$ There we go, should be better now $\endgroup$
    – Cubemaster
    Commented Jul 23, 2019 at 15:30
  • $\begingroup$ you're missing five moves: it doesn't end being a rectangle $\endgroup$
    – Belhenix
    Commented Jul 24, 2019 at 0:08
  • $\begingroup$ Remember, each move moves a domino one space along its long axis. Were you moving more than one space at a time in some of those moves? $\endgroup$
    – Don Kirkby
    Commented Jul 24, 2019 at 1:06

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