Alejandro put his finger on the piece and hesitated. if he messed up this move, it could be the end of the game. but, if he positioned himself correctly, he just might stand a chance. he picked up his finger and tapped it against his lip. then, he made his move.

what specific of information would best this description?

what alejandro is wearing
more about the opposing player
the name of the game being played
more about alejandro’s looks

The answer is: the name of the game being played.

The text is developing a description of Alejandro´s moves in a very detailed way, but, as readers, lacking the name of the actual game being played, or a more detailed description of it and its rules, makes it difficult to comprehend what is really at stake and to complete the hermeneutic process. If the writer of the text provided this context information, more information could be later provided, although this (the name of the game) certainly needs to be the first addition.  

i think that will have something to do with the mississippi river but google will know the full answer for sure

they are most likely about to fight in the battle of gaul