Like Marly said, their are many things that come into play when playing on-line. One is multi-tabling. You will see a huge volume of hands an the chances of losing is a tough hand is higher. Also I have said in a different thread you will notice on Merge sites since it is one of the handful of sites still alive for U.S. players that there is a higher volume of more inexperienced players playing, so that being said they are of course going to be playing a lot more hands then say a decent poker player will. So your chances of getting beat is greater. I decent player can look back like hand histories and note players and adapt their play. If you want to be a winning player on-line it takes some leg work or just keep pounding your head against the wall and scream it's rigged.