Good one, you want to be sure, that the hole cards your opponent had , the cards where you needed , in online poker i would say almost 90 % of the time forget it, cause you need to get a look at your opponent and think what he could have folded, or look at his expression and maybe pick up something when they are looking at your cards but know that you will never get the card you need, cause he folded it, it is hard to explain cause online stud you will have less chance to get the id of what is folded beside the cards that u have seen on the table, if you say its possible, then just say im the stud grand master, cause if everybody knew what cards where folded there would be one guy dominating every stud table in the world .
So stick to the board .
JCTM1988