[joewatch]

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This leaves me wondering how difficult the move from 50NL to 100NL is.

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In general, there is not much difference between the games on 50NL and 100NL. You will encounter mostly loose player and some tight players at both levels. The key to winning in the long term is knowing how to adjust to table conditions. IMHO, the main difference between the two is psychological - when you move up, all of the sudden the size of your pots potentially double on every street and that can seem like a lot of money. When you are used to semibluffing for $5 in 50NL, this might be equivalent to a $20 semibluff in 100NL.

I personally play only $1bb games because I play for fun, and a few hundred won/lost isn't much money to me. But if I moved up to $2 or $4, that could mean $1000 lost in a bad week, which would matter to me. NEVER play with scared money.