the dual threat of 12...hxg1=Q and 12...h1=Q, as in Schuster–Carls, Bremen 1914 and –Torre, Mexico 1928. If 10.Qd2 instead of 10.c3, then 10...exf2+! 11.Kd1 (11.Kxf2 Qxd2+) Qxd2+ 12.Kxd2 fxg1=Q rather than 10...Qxe5 11.dxe5 gxh2 12.Nf3 h1=Q 13.0-0-0 with a strong attack. There are also a few opening lines where each side gets a desperado pawn that goes on a capturing spree, resulting in each side queening a pawn in the opening. An example is seen in the position diagrammed, where play continued 10... bxc3 11. exf6 cxb2 12. fxg7 bxa1=Q 13. gxh8=Q. Both players promoted by White's seventh move in Casper–Heckert: 1. e4 Nf6 2. Nc3 d5 3. e5 d4 4. exf6 dxc3 5. d4 cxb2 6. fxg7 bxa1=Q 7. gxh8=Q More than two queens In master play, it is rare for one or both players to have more than one queen. One of the best known games in which each side had two queens is Bobby Fischer vs Tigran Petrosian, 1959 Candidates Tournament, illustrated in the diagram and analyzed extensively in Fischer's My 60 Memorable Games. Four queens existed from move 37 until move 44. Very few games have been played with six queens; two examples are Emil Szalanczy–Nguyen Thi Mai (2009) and David Antón Guijarro–Alejandro Franco Alonso (2011). In the first game, each side had three queens from move 58 to move 65. The game ended in a draw with a single queen on each side. In the second game, both sides also had three queens; Black ultimately resigned with each side having one queen. Linares incident An unusual incident occurred in a 1993 game between Anatoly Karpov and Garry Kasparov. When the game reached the diagrammed position, Karpov was in serious time trouble, having one minute to make 16 moves in order to reach overtime. Kasparov captured the rook on d1 with the pawn on c2 and said, "Queen!", indicating promotion to a queen. However, no queen was immediately available; it took some time for the arbiter to find a black queen. Kasparov later said that, if he had been more attentive, he would have promoted to a rook, which was available. Kasparov's clock was running while the arbiter was getting a queen, so he started Karpov's clock. Karpov immediately played 25.Qxe4, and Kasparov told him that he was in check, to which Karpov replied, "From what? It might be a bishop on d1." At this point,