Greatest mind game...........

Chess is ONE of the best mind-power games. Simple logic says it cannot be the 'best' for no study was ever made to determine the best. Shall we take the game of Contract Bridge for instance. It too has International status and set of regulations. In fact, one has to keep in mind a large number of facts to play in an average game of a local club. In Chess we have to visualize future moves. In Bridge one has to remember how the bidding went just before the game commenced, what were played and what are not yet played and in whose hands they are held is no more guess work than writing the finals in a public examination. BTW, do you play online chess and what sites are your favourites?