Solving the Middle Layer

When you form the T, the color of the bottom T piece should inform you which algorithm to perform.

If the bottom piece of the T needs to fill the edge on the right, you do the 'right' alg. If it needs to fill the one on the left, you do the 'left' alg.

i.e. - A blue T with an orange piece on the bottom, you perform the "right" alg. If it is red on the bottom, you perform the "left" alg.

(with cross on top)
LEFT ALG - D L D' L' D' F' D F
RIGHT ALG - D' R' D R D F D' F'

This is how I was taught to recognize this step of LBL.

Sorry for the horrible images. Phone pictures.