[Event "Dubai 2015"]  [Site "?"]  [Date "2017.04.24"]  [Round "?"]  [White "Petrosian M "]  [Black "Kovalenko I "]  [Result "0-1"]  [SetUp "1"]  [FEN "8/8/4n3/8/5p2/6pN/6P1/4k2K b - - 0 1"]  [PlyCount "17"]  [SourceDate "2017.04.24"]   1... f3 $1 {[pgndiagram] Black wins with the help of this amazing move.  However, the continuation is not so clear cut due to stalemate ideas.} 2. gxf3  (2. Ng1 {Is also slightly tricky} f2 3. Nf3+ Ke2 4. Nd2 Nf4 5. Nf1 Ke1 {  [pgndiagram]} 6. Ne3 (6. Nxg3 Ne2) 6... Nh3 7. gxh3 f1=Q+ 8. Nxf1 Kxf1 {And  Black finally wins}) 2... Kf1 3. Nf4 {[pgndiagram] Preventing immediate g2.  Black now has to place his knight on f2 in order to win} Nd4 4. Ng2 Nf5 5. Nf4  Ne3 6. Nh3 Nd1 {[pgndiagram] And finally Black achieves his task} 7. f4 Nf2+ 8.  Nxf2 Kxf2 9. f5 g2+ 0-1