In the 1985 Team Trials I was the victim of one of the best defensive plays of all time. In a well-documented deal, Bob Hamman refused to overruff dummy and thereby gained trump control. His play resulted in 7 extra IMPs in a match that his team won by 5.
It took 15 years, but in the first session of the LM Open Pairs, my partner, David Berkowitz put me on the winning side of such a defensive ploy:
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