monk and Imp. unarmed strike

[Luigiana]

Except you aren't hidden if you're behind him due to the fact that in 3.5e, the facing rules were discarded for being a PITA.

Where are you getting this from? It not in the SRD from what I can tell.

Look, let's think about this. If you walked from the front of someone to his behind during your round, do you think that would qualify you for a sneak attack by virtue of having moved around him?

the tumble skill specifically states that you can tumble THROUGH an opponents square. whether that is jumping over his head or rolling through his legs is not important.. but you will be standing at the opposite of ur enemy.

also if to characters are flanking a third character, then he is only flatfooted to one of them..

 

[Dandu]

the tumble skill specifically states that you can tumble THROUGH an opponents square. whether that is jumping over his head or rolling through his legs is not important.. but you will be standing at the opposite of ur enemy.

Yes, just as if you had walked around him. And he will not be flanked or flatfooted when it happens. Just as if you had walked around him.

 

[Luigiana]

Yes, just as if you had walked around him. And he will not be flanked or flatfooted when it happens. Just as if you had walked around him.

you cant walk around him if he is standing in a one-square-door though you can still tumble around him.. so you dont "go around him" you pass through his own square.

and then, as far as i know. If your standing behind a target, then it provokes attack of opportunity to turn around.. since it takes a moveaction to turn 180 degreese..

 

[Dandu]

you cant walk around him if he is standing in a one-square-door though you can still tumble around him.. so you dont "go around him" you pass through his own square.

Etheralness. Earthglide. Incoporeality. Blink. Greater Blink.

and then, as far as i know. If your standing behind a target, then it provokes attack of opportunity to turn around.. since it takes a moveaction to turn 180 degreese..

Again, the rules you seem to be referring to do not exist in D&D 3.5e.

 

[RUMBLETiGER]

While hidden from opponent, treat that opponent as flat-footed. (Rules Compendium, p. 92)
so standing behind him and attacking him in the back should be considered as being hidden and hence treating him flatfooted.
or am i wrong?

Being out of vision is not the same thing as being hidden. If I know you are behind me, you're not hiding, you're just out of my sight for a brief second.
Hidden implies I do not know where you are located.

From the SRD:
"If people are observing you, even casually, you can’t hide. You can run around a corner or behind cover so that you’re out of sight and then hide, but the others then know at least where you went."

This is also in Rules Compendium p.92, and Player Guide p. 72.

While Hide is opposed by a spot check, if a person hears you in the 5' square behind them, because they just saw you go under/around/through/over them, you're not considered hidden.

Perhaps if you tumbled past an opponent and then attempted to hide in the bushes nearby, or in the pile of trash in the alley, etc, you could do a hide check.

 

[kitcik]

This is silly.

If you want help with your monk build, be nice.

If you want to argue against the flat-footed rule, that is another thing entirely.

So far, you have received a lot of comments explaining the rules to you, which you seem to gave difficulty accepting. The rule is the rule - you cannot flank (or make someone flat-footed) by standing behind them in 3.5.

I advise you move on if you want help with the build.

Is your desire to max DPS or something else?