Playing HU poker with a small bankroll

[LordMushroom2]

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playing games other than NLHE will undoutably help your NLHE game

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Yes, but I am saying it would help less on your NLHE game than if you kept playing NLHE.

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There are concepts that you will never be able to grasp if you only play one game, ergo, you will not be able to master any form of poker without learning another form.

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Why?

The only cases where I think it is true that you have to play another game to learn a specific thing are when the game you normally play don´t have a "feature" another game has (NLHE is not a high/low game for example). But when the feature is not in your regular game, there is no point learning about it.