a,9s

[olavfo]

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is a,9s about the limit for a raise here, or maybe a,8s?

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I will mostly raise A8s here as well, and against a limper I know to be weak I would raise a bit lower than that. But I'm not 100% certain how low you can go here, before it becomes a -EV move.

Of course, the mix of players behind you is important too. With tough, aggressive players yet to act, you need to be more selective. And also if the limper is tight.