God's number is 20: http://www.cube20.org/ http://www.cube20.org/ They pruned a bunch and then did brute force evaluation of the remaining "hard" positions. It

God's number is 20: http://www.cube20.org/ http://www.cube20.org/ They pruned a bunch and then did brute force evaluation of the remaining "hard" positions. It seems strange that there hasn't been a more elegant approach to proving this. An interesting (if obvious) corollary to this result is that the maximum moves between any two Rubik's configurations is 20. The relevant HN thread at that time: https://news.ycombinator.com/item?id=1587340 https://news.ycombinator.com/item?id=1587340