Drinking has surprisingly little impact on those parts of mathematics ...

I performed an experiment regarding this and at least for me the ability to do mathematics was the first that suffered. Long before balance or speech. This has been recorded by a non-drunk non-biased outside observer. It may be that this is due to the way math was checked, namely by relatively simple calculation on-the-fly. I started to make small slips or oversights. And I didn't do routine calculations. I don't do boring calculations by rote but by doing more or less clever short-cuts and these failed.