let me give all the marth players or anyone who wants to use marth some special and important advice on marths Foward B since im such a nice guy.
1st of all you can use it against your Foe at any %, it works as a stun only of they do not crouch cancel.
However, 2ndly if they do crouch cancel you have to work on your timing with it's speed, once you get the 3rd slash out, it's as strong as a foward tilt but does not have to hit your opponent at the tip to be strong.
3rdly, on the 2nd foward tilt always do a nuetral B, never do or hold up, because if you do then you cannot link it into the 3rd hit
4th, for the 3rd hit, if you want to combo hold up and up again or, just up then pause and air jump F-air
furthermore, if you want to send them flying if they are at high percents use the foward or nuetral B,
use down if you notice the person is crouch canceling or if they are sheilding, because this is a very powerful move which gives knock back therefore if you are at the right space you can avoid their sheild grab
now for the 4th hit, it's very simple....
if they are above, use Up B/A
if they are where you cannot reach then use foward or nuetral B/A
and if they are sheilding or on the ground/crouch canceling ur best bet is down since it is numerous attacks but you can still get sheild grabbed, however sometimes they don't notice how many attacks marth does for the final down so it throws them off...
sword dancing on air-
ehhhh? another discussion