There is a difference between flipping cards at the kitchen table in a relaxed environment that you are quite comfortable in and playing in a crowded casino full of lots of lights, sounds, distractions all around you during "crunch time". I noticed it way back, many years ago when I first started playing; I was unaccustomed to the casino environment so it had an effect on concentration and accuracy. Years go by and you can have bombs going off next to you and not lose count... you can have the waitress flash her breasts at you and not lose count... you can have Ed McMahon stroll up to you and tell you that you have won the Publisher's Clearinghouse Sweepstakes and not lose count... okay okay--- You get the idea!