Thats what I play normally
Well, as for me, green made slight positional mistake with l5-k5. You should never allow your left-side player be safe, if you can.
Maybe Neg2 with left side pawn pushing would be fine but it's not the best
Or just wait, only push j3, after they push l4. 2300's will almost always take your Bishop.
What if he took your Bishop 6.g? this wouldn't be an ideal position.
If I may, I'd like to interject something here. This note is basically for lower rated players who get into a game and see you're surrounded by players 300 or 400 points higher than you are. Don't abort the game. You have the chance to learn something by playing the game out. Don't be put off by the temporary alliances, ( or temporary teams if you will ) watch the moves and their order. Push your King's pawn and your King's Knight pawn 1 space so you can fianchetto the bishop. Watch out for Queens and bishops and their attacks from long range. Try to learn, if you get knocked out early, stay and watch the rest of the game.
https://www.chess.com/variants/4-player-chess/game/35434709/138/1
you put the king in corner and advance pawns while keeping your king safe with same color pawns