I feel uniquely qualified to provide this advice, not that I’ve ever even taken a GM all the way to time control, but I do have 4 IM draws notched on the gunstock, so really it’s just a matter of time, cough cough, another 300 ELO and I’m so there. But why wait? Here is your crystal-clear, utterly failproof step-by-step instruction manual for beating a Grandmaster.
1. Play him in, like, 150 rated games. Eventually he will tire of flogging you in his favorite openings, his offbeat openings, in tactical flurries, positional squeezes, and every imaginable endgame. And his boredom will eventually coincide with him eating a bad burrito for dinner, plus having a spat with his significant other and/or a falling-out with one of his children or some other relationship calamity, plus a fender-bender on the way to the club, and in this bored and nauseous and emotionally unhinged state he will blunder and give you the opportunity to pounce.
That’s it. I’m telling you, it’ll work. Give it time.
(Plan B – as you take time-scramble notation, poke him in the eye with your pen.)