Studying an opponent and Omega Strikes

Has anyone played, or even heard of, a combat system where "studying
an opponent" works as a short term combat tactic? Where the longer a
character fights an opponent (or observes an opponent being fought)
the bigger the bonus the character has to hit that opponent?

I'm thinking that such a system might be a way to use an "experienced
combatants are hard to hit" mechanic rather than an "experienced
combatants have a lot of hit points" one, without running into the
high-variance problem of the former. The first rank-one goblin to
attack the rank-umpteen StudlyChampion would not have any chance of
success, due to the StudlyChampion's huge defense bonus, but the
eleventy-seventh rank-one goblin would have, due gaining a
countervailing big bonus from having watched the first eleventy-six
goblins attack and get slaughtered. 

This could also reduce the power of surprise, and might encourage the
sort of "omega strike" tactics seen in cinematic combats. Instead of
leading off with their best attacks as "alpha strikes," combatants
would exchange shots while saving their best, "special" attacks for as
long as possible to maximize their effectiveness - using them as what
I call "omega strikes" by analogy to the standard real-world tactic of
opening with alpha strikes. 

Thoughts?

-- 
Erol K. Bayburt
ErolB1@[EMAIL PROTECTED]