Tactics (7)

The last moves were 1.Rd3-d7 Kh7-h8?? How did White close the game in Bartel - Malakhatko (Lublin 2009)?

Solution (diff. 2/5): 1.Qd4!! 1-0 (Black was that shocked by this move that he resigned. Obviously 1.- Bxd4 2.Bxd4+ Kg8 3.Rg7+ is dead lost, but Black could have played on with 1.- Qg8, after which the computer gives 2.Rf6; the position is lost anyway, but not that obvious).