This question already has an answer here:
Yesterday I played a game in a new group.
The Fighter (
F) goes in and attacks the monster (
M). Then it's my turn and I place my Rogue (
R) opposite to the Fighter in regards to the monster. I was looking for the advantage in order to make a Sneak Attack, as I recall very vividly that such positioning gives advantage. So in the end our position looked like this:
+---+---+---+ F = Fighter | | F | | M = Monster +---+---+---+ R = Rogue | | M | | +---+---+---+ | | R | | +---+---+---+
My DM ruled that I didn't have advantage because such rule doesn't exist in D&D 5th Edition. He however granted me my Sneak Attack because the Sneak Attack itself allows me to make such a hit in that situation.
I was a bit troubled because in every other group I played with, such a rule was accepted, and intensively used, even in groups without any Rogue. I checked the PHB and couldn't see any reference to this. So maybe such rule exist in the DMG?
So my question is: does such a rule for advantage exist? If yes, where is it defined? If not, does that idea of a rule come from any previous versions?