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How do you fight an opponent with a longer reach? How do you neutralize that reach?
Depends on if he can use it or not.
Movement and timing is the key, of course if you have vastly superior handspeed then it makes a difference too.
"reach advantage" isn't as useful as his style, if he's not accustomed to using his reach then its a non factor
Everyone has different ways you just have to try things out in sparring. Watch alot of boxing and try things out you see and if it works keep at it