of course, white could have moved the bishop somewhere else but white would still lose

Wow!  Now I know I am a chess master!  hehe

nice one mate..

or the other scenario...

or the last one...\

if i didnt post all 3 scenarios, SOME people would have said what if blah blah blah and say my puzzle is bad

LOL, you are right 

In the third one, taking the bishop mates faster.

in the third one, you do take the bishop

Oh, I meant with the pawn.

I may be wrong, but i think taking with the knight is less risky.

i couldve missed a faster mate, though. plz tell me if you see it

this one will lead for the shortest checkmate...

yeah youre right