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actually, I'm asking because SNGPT doesn't do overcalls, but it would be a nice feature, wouldn't it?

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Overcalls aren't a realistic and/or helpful feature on sngpt because you are playing way too much guesswork by putting two people on ranges of hands. Usually you should only consider overcalling with a stack much bigger than your opponents or a really great hand anyway so I don't see how this feature would help that much unless you had a really good read on your opponents.