Classifying games:

As  the above two stories show, games of strategy  may  arise  in  different context. Accordingly different games will have different features. In the theory  of  games  we  study these features with  subtle  details. This task of studying different games could be  simplified by  grouping these features into few categories'or dimensions. We develop this classification  in  this section by asking few questions in the following.  

Whether the Moves in the Games Simultaneous or Sequential 

Moves  in  chess  are  sequential, white  moves  first  then black  and  then white again and  so on  till  the  game  ends. By contrast, while bidding  for a railway contract, contractors bid  simultaneously without knowing competitors bids. 

The distinction between sequential and simultaneous moves is important because these  two  types  of  games  require different type  of interactive thinking. In a sequential move game, one player must think:  if I do this (adopt a strategy) how my opponent will react to it and what will be its consequence. Thus, player's  current move is  governed  by  calculation  of  its future consequences. But in simultaneous move games one player has the trickier task to figure out what her opponent  is going to do right now. She also must recognise that her opponent is also constantly trying to do the same thing.