Six Coins

Take six coins and arrange them in a triangle as shown in the image. Your goal is to rearrange the coins into a hexagon with only four moves. Every move consists of sliding one coin to a new location where it touches at least two other coins.

The solution is shown below.

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  1. seems like can just do it in 2 moves, bottom left to upper right, then take middle and complete.

  2. The problem is solved by moving two coins. If you do it in the correct order no sliding of the other coins is neccessy

    1. I believe that if you try to solve the puzzle with only two moves, you will not be able to complete the second coin slide without rearranging the surrounding coins.

      1. If this would be true, step 3 in the original solution would suffer from the same problem.

        1. In the third step, if we slide the middle coin carefully, we can take it out, without rearranging the two coins on its left and right.