[Event "Tactics #75"]  [Site "?"]  [Date "2017.11.14"]  [Round "?"]  [White "Tactics #75"]  [Black "   Geller - Yap, Moscow, 1986   "]  [Result "1-0"]  [SetUp "1"]  [FEN "2r2rk1/2q1bp2/p3n1pp/1p1pP3/3B4/3B2Q1/PPP3PP/3R1R1K w - - 0 22"]  [PlyCount "15"]   22. Rxf7 $3 {[pgndiagram] Is the winning sacrifice here} Rxf7 (22... Kxf7 {Is  obviously even worse} 23. Qxg6#) 23. Qxg6+ Kf8   (23... Rg7 {Is even worse} 24.  Qxe6+ Kh8 25. Qxh6+ Kg8 {[pgndiagram] And it is easy to see that White is  winning here. The most direct way is} 26. Bf5 $1 Rf8 27. Be6+ Rff7 28. Bxf7+  Rxf7 29. e6) 24. Qxh6+ $1 Ke8   (24... Ng7 {Is impossible due to} 25. Qh8#) 25.  Qxe6 {[pgndiagram] And now, since White has established material equality as  well, Black is completely lost} Qc6 26. Qg6 Qxg6 27. Bxg6 Kf8 28. Bxf7 Kxf7 29.  c3 {And here Black resigned in the actual game.} 1-0