...this tutorial will teach you the 6 Frame cycle. The 6 Frame cycle includes 6 frames every step...
I think this is actually a 12-frame walk cycle, because it takes 12 frames (6 frames per step * 2 steps) to return to exactly the same position in the walk. One way to think of this is to ask "How many frames does it take for the figure to get back to the '1/2 way between studs, right leg forward, left back' position?" It takes 12. My point is that you can't count '1/2 way between studs, right leg forward, left leg back' as the same position in the cycle as '1/2 way between studs, left leg forward, right leg back'.
Nice tutorial otherwise, though I find balancing those little buggers at 1/3 of the way between studs is quite a pain, 1/2 way is not too bad.
One weakness of this walk cycle is that frames 1,2 & 6 are all "on the stud", which means the torso is stationary for 3 frames, moving forward for 3, stationary 3, moving forward 3, etc. So watching a number of consecutive steps will reveal the figure has a start & stop look to it. (When people walk, our torso are effectively moving at a constant speed, I try to simulate that in my walk cycles.)