Oops! So much for keeping your head (the 6) for as long as possible! (and so much for laughing out so loud! :-))
Notice that now Adam has the head on the 4 (which, BTW, you can easily know which 4 it is. Just check the ones that are on the table, and you'll see which one is missing).
Now, how do you know that it is in Adam's hands, and not Mike, or HAL? Well, Mike just passed on 4's, so that leaves just HAL. But do you think that Adam would have been such an idiot to force the game absolutely in favour of HAL? If Adam only had the double-four left, it would have been a VERY bad play to force the game to 4's. It is 99.9% sure that the remaining 4 (the 4-1) is in Adam's hands).
But hey, that's not that bad: Adam is still TWO rounds behind HAL, so his chances to arrive are not great, even though he has a head. And as for blocking the game (which he could do, since he has the last 4), I don't think so! They have more pieces than you and HAL, plus the fact that they don't have any blanks (we are supposed to have the blanks). So, if they block the game, it is almost sure that they would lose.
Anyway, coming back to your
decision... You don't have any decision, so go ahead and play the
only one that you can play...