> Yes, 9>5, but 20 (for whomever gets his king) ...
Yes, and "whomever" is a critical word here. Blue cannot be sure he will get those +20! He cannot even say: "the probability is 50% that I will checkmate Red". While taking green Q is a guaranteed profit.
And once you accept that we talk about probabilities and they do matter, then you understand that teamers just spoil the Spirit of the Solo Play Game. They play as a team in FFA. In a real Solo Play game there is a very high probability that your hanging Queen will be taken by any other player. But teamers remove this parameter from the game equation. They replace "high probability" with 0 for 2 of them. They form an alliance and get an unfair advantage over 2 other players.
So, other 2 players have the only way to win: also form a team in a Solo Play game. And we will see another Teams mode, just with points earned for capturing pieces.
This is not what FFA mode supposed to be.
Let me repeat what I said in other thread:
"There is an opinion that some 4PC Players (including some Top players) try to win at all costs and care about their rating too much. They forget about the Spirit of the Game and about getting fun from the game process, not from the win only."
Yes, 9>5, but 20 (for whomever gets his king) is >20. So mathematically, as far as the overall picture is concerned, yes, this is better. In the position, all of Green's other pieces are too far away to make an impact any time soon (his earliest check is 3 moves away, and involves putting his rook en prise on h8). Green leaving his Q hanging is okay, since he understands Blue is smart enough to not sign his own death warrant.