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Fully proportional cube that allows only 180° turns.
This puzzle has been known in theory since at least 1981 when Morwen Thistlethwaite used the half-turn-cube for proving a new upper bound for God's number. Please search for "Thistlethwaite's algorithm" to find out more.
The half turn cube is a Rubik's Cube that allows only 180°-turns.
The first known physical sample was made by Takafumi Haseda no later than 2007 although no images were preserved.
The name "HANZOH" was given by Mr.Suse, a friend of Mr. Takafumi.
HAN means half by one character Kanji, and ZOH is used often as a name suffix for old persons.
The version shown here was redesigned and rebuilt in 2017 by Luke Chase. Unlike the version from Oskar van Denveter the pieces have a perfect cubic shape. As the predecessor was unknown to him he named his version "180 Cube - proportional half turn cube".
This puzzle's cores are placed at different distances from the center to restrict the turns to 180°. This later version is 3D-printed and was presented in 2018.
Edge length: 57 mm
Weight: 92.6 grams
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