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No-op moves in 2x2 scramble #921

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xsrvmy opened this issue Jul 20, 2024 · 0 comments
Open

No-op moves in 2x2 scramble #921

xsrvmy opened this issue Jul 20, 2024 · 0 comments

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@xsrvmy
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xsrvmy commented Jul 20, 2024

According to a post on CF, the following scramble was generated at Autotalo Anime Adventure VIII 2024 in 2x2 1B:
R U2 R2 U2 R2 U2 R2 F R2 U2 R'
The bolded moves form a no-op that is very well known, meaning this is obviously a 5-mover, and this defeats the purpose of generating a 11 move scramble to conceal the optimal solution.

Acoording to a comment, the following scramble was also generated (this one back in 2022):
U2 R2 U' F U2 R2 U2 R2 U2 R U'
Here the bolded moves perform just an R2 so it's clearly a 6 mover, but this one is not as obvious.

I think it may be worthwhile to eliminate these types of no-ops in 2x2 scrambles, so that 4-6 movers don't get leaked because of them. Specifically, maybe it's worthwhile to explore R2 last if the previous two moves are R2 U2 (and similar for other double moves), since these seem to be the culprit for forming no-ops, another common one being R2 F2 R2 U R2 F2 R2 U.

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