Interesting. Binge drinkers who pace themselves are far less likely to experience blackouts.
Alcohol will impair partially or completely the brain's ability to transfer short term memories created during a drinking episode to long term memory storage centers. Everyone knows this. However, the occurrence of anterograde amnesia (i.e. blackout) has little to do with the amount of alcohol consumed, but is directly related to the amount of time in which a large amount of alcohol is consumed. Studies show test subjects don't experience blackouts when drinking slowly, despite being heavily intoxicated by the end of the experiment.