F2L is the second step of CFOP and arguably the most important. F2L stands for "First 2 Layers" and comes right after solving your cross. There are two different ways of solving F2L when dealing with CFOP, one is intuitive F2L and the other is algorithm F2L. Just about no one solves exclusivity with either of these, but with an amalgamation of the two. Intuitive F2L basically means you use no algorithms and everything is solved with your common sense and pre-existing understanding of the cube and how it works. Algorithm F2L focuses on specific cases and scenarios. It is a lot of work to memorize all of these algorithms for these specific cases but it pays off. When a case that you have memorized an algorithm for, it can be solved much faster and in a more fingertrickable way than it would be solved intuitively. Because of this I have been recently memorizing algorithms for specific cases which I have had trouble solving quickly in the past. This is a great video made by Daniel Sheppard that shows some very good algorithms for cases I have had trouble with in the past.
My F2L favourite algorithm I have learned so far is this case.
The algorithm to place the corner in while the edge is already solved is R' D' R U' R' D R. Normally this case would require a time consuming Y rotation but this algorithm utilizes D turns and it can be executed very quickly. This is also a great algorithm because it can be used to force an OLL skip. An OLL skip is where the OLL stage is completed already after F2L and does not require an algorithm. When the case appears like this you can execute the algorithm and it won't un-orient any of the other pieces leaving you with an OLL skip allowing you to move straight into PLL. When done intuitively, this would not be the case. This is what the cube looks like when you are able to utilize this algorithm to force an OLL skip.
My F2L favourite algorithm I have learned so far is this case.
The algorithm to place the corner in while the edge is already solved is R' D' R U' R' D R. Normally this case would require a time consuming Y rotation but this algorithm utilizes D turns and it can be executed very quickly. This is also a great algorithm because it can be used to force an OLL skip. An OLL skip is where the OLL stage is completed already after F2L and does not require an algorithm. When the case appears like this you can execute the algorithm and it won't un-orient any of the other pieces leaving you with an OLL skip allowing you to move straight into PLL. When done intuitively, this would not be the case. This is what the cube looks like when you are able to utilize this algorithm to force an OLL skip.
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