If you trade ES options you might have an interest. On Friday saw an opportunity to get 7 pts by selling a 55call and 60 put so if we ended up between the two I'd net out 2 pts on the trade. Plan was great as we ended up at 59.75 (set was 57.70)....however TOS exercised the call so I ended up short @55 but didn't exercise the put which of course would have offset the call. I double checked the CME rules "European Style. Exercisable only on expiration day. On expiration day, all in-the-money options as of 3:00 p.m. CT will be automatically exercised. Contrarian instructions are not allowed. Exercisable only on expiration day." went back on the minute chart and saw at 15:59 ES was 60.02 and at 16:00 it was at 59.75. I guess the trade desk clock is off. While it so far is working to my advantage since set is 1457.70 and could easily open soft on Sunday...I need to close the short on Sunday nite and don't like the risk associated with having this short. soooo even when you know the rules your broker can still screw you up!