I learned to solve the Cube as a kid with NO book! Trial and error, now as an adult, I am using Dan Harris' book "Speed Solving the Cube" to relearn the final steps (which I forgot) and to get faster...
However, SEVERAL TIMES after I have the first two layers solved (easy) and the bottom edges lined up (that's next after the X on the bottom) and make the bottom solid, the book says you should have ONE corner solved and has a move to learn... nice when that is true. It says that it is impossible to have two corners solved. But I get that A LOT. It only offers "rotating 3 corners, one way or the other" OR (advanced) "swapping adjacent sides" or "swapping diagonal" but neither of those will work if you have TWO corners correct. Any of those moves will never correct the Cube.
Often the corners are ALL CORRECT, but in the wrong place - in fact, if I rotate the bottom one quarter turn, the Cube is solved on corners but ALL FOUR center/edges are off.
QUESTION: Is there an algorithm for swapping ALL FOUR bottom edges when the rest of the Cube is solved? As I end up there a LOT and have to just mess it up and start all over to get the "one correct corner" the book promises will be there for me.
Thanks anyone who can help me out!
I am using a Void Cube, so that may be the issue?
Nevertheless, here is how I keep ending up:
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