 In the 1889 game between Siegbert Tarrasch and Semyon Alapin at Breslau, Alapin was expecting 5.d4, the normal move after 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 in Petrov's Defence.But by the time he looked at the position he had already touched his , intending 5...Be7 in reply to 5.d4, not noticing that White actually played 5.d3 attacking his knight.Now compelled to move the bishop, he would lose the knight without compensation, so resigned immediately .