River: payoffs and folds

Vs stations, value thin. Vs rocks, find folds with second pair. Don't hero-call because 'it's only one more bet' for the tenth time tonight — those bets add up.

Vs rock river raises, find folds with second pair. Vs station, value thin one more street with strong tops.

Thin value is the engine. In limit, one extra big bet on the river with medium showdown value is often the session.