Hero-Villain Confrontations

Dominic Flandry converses with Aycharaych perhaps four times in "Honorable Enemies":

when burgling Aycharaych's apartment;

before the hunt;

after the hunt;

at the end.

Twice in "Hunters of the Sky Cave":

in the Solar System;

in the Sky Cave.

Twice in A Knight Of Ghosts And Shadows:

on Talwin;

on Chereion.

And other times during their careers that we are not told about.

James Bond comes face to face with Ernst Stavro Blofeld just three times:

two interviews over two days when they are both in other identities;

once later in Japan when Bond is recognized as the man who had called himself Sir Hilary Bray.

Holmes and Moriarty once in Baker Street and once at Reichenbach.