the alternative 6.Ng1 Bh6, however in practice White has achieved good results in this line after 7.Nc3 c6 8.Nge2 Qf6 9.g3, and Nigel Short used it to defeat Vladimir Akopian in Madrid 1997. Another popular move is 4.Bc4. Fischer recommended 4...h6 in response, which he dubbed the "Berlin Defence Deferred". Black's third and fourth moves stop the white knight on f3 from moving to the two dangerous squares e5 and g5. This variation received a high-class examination in a game between two world champions: Boris Spassky vs. Anatoly Karpov, at Berlin TV 1982, played at a one-hour-game format in an event for West German television. GM Spassky won on time in an ending of Q + N vs Q; White had a satisfactory position from the opening. A quite recent idea is 4.d4 g5 5.Nc3. White intends to leave the bishop on f1 for a while, play an improved version of the Hanstein Gambit (3...g5 4.Bc4 Bg7 and later g2–g3), and, after forcing Black's f4-pawn to move, develop the queenside with Be3, Qd2, and 0-0-0. See also List of chess openings List of chess openings named after people References Chess openings 1961 in chess Bobby Fischer