The rubiks cube can be solved by applying a handful of algorithms repeatedly.
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The algorithms themselves are second nature to anyone who solves cubes regularly.
Whilst I am not saying that what this guy does is not impressive I do think that with a good enough memory it would be possible for a rubiks expert to view a bunch of cubes and then just decide which algorithms to apply to each one before donning the blindfold.
Then all he has to remember is a long sequence of algorithms, the individual steps of each algorithm having already been well learned, to solve all the cubes and let his well practised hands do the rest.
Not easy. But not impossible for those with that sort of mind.
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