26 June 2019

DaYan's Bermuda Barrel

After completing my "Grand Tour" through the eight puzzles, named after the major planets in the Solar System, the next Bermuda puzzle I obtained was the barrel.

The puzzle is basically a shape modification of the Mercury cube. There is one Bermuda face, at the top of the barrel, on the green face. Cornering is not the best, compared with most Rubik's cubes, but better than most Bermuda puzzles. As I write this, have only experienced a popping problem once and I have had one of the covers of a triangular piece fall off. Some room for improvement in the design there, methinks.

Before my first solve, I neglected to take note of the configuration of the puzzle. I, therefore, had to figure out how it should look in the solved position. After completing the solve, I realised that it was in a different configuration from the one in which it arrived, The original had the white edge next to the hypotenuse of the green triangular centre the alternative is yellow.The puzzle is more nuanced than I had first realised.

The middle layer has square centres and square edges that, at first glance, are indistinguishable. This can make positioning the middle layer a little tricky during a solve.

Solved Configuration 1

The configuration in which I received the puzzle with the white edge on the hypotenuse
...

Solved Configuration 2

The alternative solved configuration with the yellow edge on the hypotenuse...


Solution

As explained above, there are a total of eight solutions to the puzzle. There are two green triangles with red sides. In the solved position, these two pieces are on either side of a 45° angle of the green triangular centre...


Step 1 - Solve the Green Face

Solve the green face, bearing in mind the green corners with red sides solve the green face.

The two red/green corners...


The solved side...



Step 2 - Solve the Middle Layer

This is slightly more tricky than it looks. At first glance, the centre pieces are indistinguishable from the edge pieces. The middle layer can be turned in half turns. This affects which vertical slices can be rotated: either the hypotenuse or the other two sides. The puzzle can be solved with either freedom of movement. However, the puzzle arrives with freedom of rotation on either side of the right angle.


Step 3 - Solve the Blue Corners

This is not difficult. The standard algorithms used with a normal cube work as long as you amend them to take into consideration the bandaging created by the green face's Bermuda-face.

It is possible that a parity issue could complicate matters. The two red/green corners will be helpful in solving this problem.

Step 4 - Solve the Blue Edges


The final step is to solve the blue edges. Again, not too challenging provided you take into consideration the bandaging of the green face.

 

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