Jeff reasoned that if declarer were afraid of spades, he might have held off rather than winning the first round and that with the heart suit set up, declarer would have enough tricks on any layout to fulfill his contract. The only hope for the defense was to score four more tricks first and they would have to come from the diamond suit. Jeff's switch to the ten of diamonds sealed declarer's fate and brought home a well-deserved 10 IMP swing to Team Xiao!