It was the way Taylor seized upon his opponent's weakness, and took advantage of it in a relentless and almost sickening manner.

BBC: Is Taylor the greatest sportsman ever?

And he still studies up on his opponents, looking to use any competitive advantage and exploit any weakness.

FORBES: Sports

Investors with a balanced asset allocation and the discipline to rebalance have the added advantage of systematically selling stocks into strength and buying into weakness.

FORBES: Market's Swoon Should Be Your Wake Up Call

If history teaches anything, it is that the Russians are adept at taking advantage of Talbott and his associates, finding ways even in moments of acute weakness to play for advantage, to have it both ways.

CENTERFORSECURITYPOLICY: Center For Security Policy

And hope the rest of the world will neither notice nor take advantage of our weakness.

CENTERFORSECURITYPOLICY: Obama's defeatist 'strategy'