As Filipe
@Filipe Teixeira is wanting to enhance his F2L skills, I'm offering a little solve critique:
Next: L F2 D' L2 F2 L2 U L2 U R2 D' L2 U' F' D R B' D2 B' F'
U' L' U L U' R' F R F'
L U L' d R U' R'
U' L' U' L
U2 y' L' U L U2 L' U' L
(ninja'd two times)
Your 4th slot doesn't need the U2, just a different algo. The y or y' is still OK, giving these 2 choices:
y R' U' R U' R' U R
or
y' L' U' L U' L' U L
Your first slot (FR) could be done without the sledge:
U' L' U L R U' R'
or
U' L' U' L R U R'
Alternative choices would be:
(BR) L' U L R' U R ( empty slot use )
(BL) y R' U R U' R' U' R
or y' L' U L U' L' U' L
(FL) U' L' U' L U' L' U L
or U R' U' R L' U2 L ( empty slot use, though doesn't save much, QTM turns is the same )
and:
Next: U2 R2 B U2 L2 F' R2 B2 R2 L D2 L B' U2 R2 U F' U2
L U2 L' f R f' //1P
U2 f' L' f //2P
F' U F U' F U F' // 3P
U R U2 R' U2 R U R' //4P
The 3rd pair would likely be faster if you had rotated first, and solved with R-U moves:
y' R' U R U' R U R'
and the 4th slot would be slightly shorter if you had done U2 first:
U2 R U R' U' R U R'
or as you seem OK with F moves, the neatest solution is:
F' U F R U R
I hope this interested you.
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F2 R2 D2 L' B2 F2 U2 B2 L2 R' U2 D' B' U' B' U F' D L' R2