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The 2nd step of the Fridrich method and thus solving your 3×3 cube faster is F2L; this stands for First Two Layers. F2L is very important because this step saves the most time. Unfortunately, it is also immediately an extremely difficult step to master really well, not because the algorithms are so difficult, but rather because while solving, you already have to see where the next piece is that you need for the solution.
There are a total of 41 different F2L situations. Often a situation can be solved in several ways. Solving F2L you more or less intuitively. This explanation is about the basics of F2L. Solving consists of 2 parts. The first part is properly merging a corner and an edge piece to a so-called block. The second part is about inserting this block in the correct position, the slot.
Preparation (Getting to the top layer of the cube)
F2L can ultimately be reduced to 3 situations. To start with one of these three situations, however, you must first bring both the correct edge cube and corresponding corner cube to the top layer of your cube. By then practicing with these 3 situations, it is possible to improve your solution times with F2L;
Preparation (Splicing)
Sometimes the corner and edge blocks are stuck together the wrong way in the top layer. Step 1 is to split the blocks so that you can start merging them correctly. When splitting you must be careful not to undo the previously solved situations.
Situation 1.
The corner cube is in the top layer of the cube with a white sticker at the top. The method to solve this situation is as follows; You bring the edge cube you want to merge to the plane with its own color, in the case of the image below it is U2 (red). Then you rotate the edge block away from the position where you want it, this can go either way, but in this case is FI. Then you merge them together UI. You can now restore the bottom again by executing F and as you can see they are now correctly in the top layer. So the following algorithm: U2 - FI - UI - F. Now you can insert the merged block as described above.
Situation 2.
Both the corner cube and the edge cube of your cube are in the top layer and are the same color. The way to merge them is to bring the corner cube with the non-white side to the bottom of the cube. This could be an F in the case shown in the picture, but then the previously joined blocks get tangled. So the solution to this is first a UI and then an R. You can then bring the edge cube back above the corner cube and merge. UI - R - U - RI With a U you then move the merged block back above the correct so-called slot. (The position where you need to insert the block) You can continue inserting.
Situation 3.
Both the corner block and the edge block are in the top layer and are different colors. This situation can occur in 2 different variants. The first situation is situation 3.1 below where you use a simple FI rotation to merge the blocks correctly. You can also easily insert the block by UI - FI. In situation 3.2, you will have to move the border block first. To move the edge block without breaking other parts, you will also have to move the corner block to another position first, for example UI - R. Then move the edge block 1 turn U. Now bring the edge block up again and you can merge them as in situation 3.1
If you master these techniques well, you can move on to the more advanced explanations of F2L.