> @BabYagun what would you you play here?
You took this position from https://www.chess.com/clubs/forum/view/excessive-teaming-by-blue-and-green-2018-11-03 , so you can see my opinion there.
Your question "what would you you play here?" is wrong (or incomplete, at least), because the context is missing if you do not show the whole game. 4PC is not classic 2 player chess. In classic chess you see a position and you have 100% full information (in some rare cases they also need to mention if kings can castle short or long). In 4PC a position without move history may be not enough to make a conclusion.
The first question is: How did Blue appear in that position? And if you'll look at that particular game, you will see that that position became possible, because Blue and Green played like a team. And once you understand this, you get enough info and can suggest Blue's moves. Green's 9th move in that game https://www.chess.com/4-player-chess?g=399006 when he does not take a hanging blue bishop was just signing a teaming contract.
I will not appear in that position, because I don't cheat, so your question "what would you you play here?" is meaningless. It is like asking me: "What lipstick (presented on this photo) would you choose?" I don't use lipsticks, so it is not a relevant question.
I did not say it's from the rules! I said it's from a
pinned forum topic by the author of the rules
and i had linked the thread in the post already: https://www.chess.com/clubs/forum/view/your-best-friend-backstabber-and-worst-enemy.