// Decisions are normally executed seperataly
// by the state machine to support generating
// multiple branches in a search tree.
// For this to work the code must be written
// in a certain way. (It must be broken in
// many small pieces so the statemachine
// can resume execution.)
//
// For non-branching decisions we can cheat
// and execute decisions immediately, this
// simplifies the code where branching is
// not needed.
protected TResult Execute <TResult>(Decision decision)
{
var handler = decision.CreateHandler(Game);
handler.Execute();
return((TResult)handler.Result);
}