Square-1

SQUARE-1

The Square One, also known as Back to Square One and Cube 21, is a puzzle similar to the Rubik's Cube. Its distinguishing feature among the numerous Rubik's Cube variants is that it can change shape as it is twisted, due to the way it is cut, thus adding an extra level of challenge and difficulty.

FACTS

• The Square One, with the full name "Back to Square One", and alternative name "Cube 21", was invented by Karel Hršel and Vojtěch Kopský around 1990.
• The Square One consists of three layers. The upper and lower layers contain kite and triangular pieces. They are also called corner and edge pieces, respectively. There are all together 8 kite and 8 triangular pieces. The kite pieces are 60 degrees wide, while the triangular pieces are 30 degrees wide, relative to the center of the layer.
• If different rotations of a given permutation are counted only once while reflections are counted individually, there are 170 × 2 × 8! × 8! = 552,738,816,000 positions.
• Bingliang Li of China holds the world record single (6.96 seconds, set at the Guangzhou Wushan Open 2014) and average (10.96 seconds, also set at Guangzhou Wushan Open 2014) for the Square-1.

GUIDES

Part-I  -  This part deals with notation and algorithm system, bringing the cube back to                         shape, sending edges and corners to correct layers.

Part-II -  This part deals with Permutation of edges and corners, parity and solving of E 

                Ring.