[cartman]

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Is this too weak?

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Any further aggression on your part would be absolutely criminal. If the board doesnt pair, call and expect to lose almost always. Whether or not a 4th spade falls shouldnt be too relevant here in my opinion because a call is only to protect against a maniacal overplay of a lower set or two pair on big blind's part. I would spend (in other words piss away) one river bet regardless.

Cartman