the sixth and final fight between lamotta and robinson took place at chicago stadium. this fight was scheduled for 15 rounds and was for the middleweight title. held on february 14, 1951, saint valentine's day, the fight became known as boxing's version of the saint valentine's day massacre. in the last few rounds, lamotta began to take a horrible beating and was soon unable to defend himself from robinson's powerful blows. but lamotta refused to go down. robinson won by a technical knockout in the 13th round, when the fight was stopped with lamotta lying on the ropes.