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Is buying in to a 1/2nl game for only 100 dollars worth playing, grinding even?

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yes. thats 50 big blinds, there is plenty of play.

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How should I play differently with a half stack?

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rebuy often when you go low. The game will play just like a 1/2 with a 200 cap - except the pots will likely be smaller. Adjust bet sizes accordingly.

Also I recommend you read about Ed Miller's short stack strategy in Getting Started in Hold'em, a beginners book but it contains some great theory on the game.