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If I am playing my bankroll (I may not be) when I am trying to move up, I would play just one table and focus very well for many reason, and not the least because that way I will learn the type of the game there and learn better. But if I have done that already, I will be playing two tables (at easy games I would play up to eight tables if they are all good) if my edge is good enough. Two tables will add 100%, the third adds only 50% and drops player observation profits more or less badly. So, two seems good, though I am talking about shorthanded games (not sure about full ring games but there is some similarity). But if the edges are marginal, it's not worth it to play two tables, but it could be worth it to play more tables (50% drop per table times X-tables). IMO, everyone should aim to play at least two tables.