Swap algorithm for two Face Pieces on 3^4

[vasvaria]

Hello Hypercubers,

I'm Adrian Vasvari, the 131st solver of 3^4 from Hungary.

After an absence of more than 10 years, I started to play with 3^4 again. I used Roice's method but ran into the same problem time by time when I tried to finish the last two Face Pieces on the bottom (yellow) Face. Namely, they are often swapped. (Yellow-red and yellow-brown on this screenshot).

After lots of days of thinking and trying different scenarios... yesterday I finally managed to make up a clean & short (only 13-step) algorithm to replace two face pieces with each other without messing up any other face pieces (especially the brown-red in the "keyhole" on this screenshot).

If somebody else is also struggling with this, the following algorithm will definitely make you happy :)

Back, 11, Right

Top, 11, Left

Front, 11, Left

Top, 11, Right

Back, 11, Left

Top, 11, Left (2x)

Front, 11, Right

Top, 11, Left

Front, 11, Left

Top, 11, Left (2x)

Front, 11, Right

Have a nice day!

Best regards,

Adrian

[Alvin Yang]

If you don't mind messing up a few more edge and corner pieces, you can also just do the Sune + TU which is 9 moves and effectively achieves the same thing for the face pieces.

RU TU RU' TU RU TU2 RU' TU or in Roice's notation: 

Right, 11, Right 

Top, 11 Right

Right, 11, Left

Top, 11, Right

Right, 11 Right

Top, 11, Right x2 

Right, 11, Left 

Top, 11, Right

Alvin

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