Better not soldier on
Could I just sort of mention, that Mycroft keeps telling Sherlock and John all along, that this - Eurus’ wicked tasks - are no game.
What is this? We can’t do this. Is this supposed to be a game?
Used to games and used to tricky cases however, Sherlock and John rush on. Obviously annoyed by Mycroft’s refusal to join in.
Sherlock: What do you make of it?
Mycroft: Am I being asked to proof my usefulness?
Sherlock: Yes, I should think you are.
Mycroft: I will not be manipulated like this.
Also, not only does Mycroft anticipate exactly what Eurus has in store for them, he also tries to warn them both.
Well done, Dr. Watson. How useful you are. Do you have a suspicion we’re being made to compete with each other?
Yet Sherlock and John are trying to pull through - as Soldiers. After all they have solved a great many tricky cases. But this one here: each single task should convince them, that they are not going to win. And they might remember for a moment that Eurus would have been perfectly happy with blowing all three of them up just about a day ago.
Nonetheless - nothing of this causes them any uncertainty. They. just. soldier. on.
Eventually the three of them reach the moment to realise that the out of control aircraft is now heading towards a city, and thereby promising to claim even more victims. Again it is Mycroft who points this out, trying to convince Sherlock and John that they need to help the girl steer the plane away from mainland to avoid further casualties.
Cruel as it might seem, Mycroft is right. And John’s reaction, his look and him backing away, are entirely infuriating (to me at least). Even now John and Sherlock think they might solve this case - this final problem.
So we find them, after Sherlock shattered Molly to pieces and still believing that he might be on the winning team, in the elimination game, when finally - FINALLY - Sherlock realizes that he will not win, as long as he plays along.
He decides to go against the rules, putting an end to the game and forcing Eurus’ hand - a hand they had to fear all the time anyway. There was no promise by her of any sort that any of them three was supposed to survive the day.
So here it takes us to the controversial Chess Photo, that shows Sherlock’s revolt, throwing the pieces towards the observer - which might very likely be Eurus.
After rewatching the episode I find the picture quite misleading.
It was Mycroft who didn’t play by the rules all the while.
No idea what would have happened if Sherlock for once would have listened to what his brother said, instead of telling Mycroft to shut up again and again.
Maybe just sometimes Mycroft DOES know better.