It's not the river
I believe it's not the river the risk, is your type of game, you know when a hand is strong enough to win or not, do you know wich y the strongest cards in poker?, is it possible that your opponents to get a poker, color, straight? if there's no color and you have a traight look if you have the highest color card, else you can loose, it's all to know the game , opportunities and know if you can risk it or not