When I was a very young man, my boxing coach taught me that: I trained hard, your opponent trained hard. You’re strong, he’s strong. You know how to box, he knows how to box. Get an edge. . .Piss him off and don’t let him piss you off.
Regards,
HLB
Similar thing in “The Art of War” I think - something like “if your opponent is irritable, anger him”.......