Fischer was renowned for his opening preparation and made numerous contributions to chess opening theory. He was one of the foremost experts on the Ruy Lopez. A line of the Exchange Variation (1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6 dxc6 5.0-0) is sometimes called the "Fischer Variation" after he successfully resurrected it at the 1966 Havana Olympiad. Fischer's lifetime score with the move 5.0-0 in tournament and match games was eight wins, three draws, and no losses (86.36%).