Not knowing what your opponent will do does not make it a game of chance. For the purpose of defining gambling, the component of chance must be exogenous to the participants.
> For the purpose of defining gambling, the component of chance must be exogenous to the participants.
There are many different legal definitions of gambling (even in the US -- each state that regulates gambling has at least on definition of its own, as well as the feds, and the same jurisdiction may have different definitions in different laws) but the one you posted upthread requires only that the future contingent event on which one participant is at risk be out of control of that participant, not that it must be "exogenous to the participants".
