[Event "1969"]  [Site "White to play and win"]  [Date "2017.04.04"]  [Round "?"]  [White "Rogoff"]  [Black "Spencer"]  [Result "1-0"]  [SetUp "1"]  [FEN "r1r3k1/5pbp/b1p1pnp1/pp2N1B1/3P4/PBP4P/1P3PP1/R3R1K1 w - - 0 1"]  [PlyCount "7"]   1. Nxf7 {[pgndiagram] White forces a win with the nice knight sacrifice} Kxf7  2. Rxe6 {Here Black has multiple replies, all of which fail} Ne8 {The game  continuation is probably the worst} (2... Nd5 3. Rxc6 Rxc6 4. Bxd5+ {Leads to  the endgame in which White is three pawns up}) (2... Kf8 3. Bxf6 Bxf6 4. Rxf6+  {Leads to an endgame where White is two pawns up}) (2... Nh5 3. Rf6+ Ke8 4.  Re1+ Kd8 5. Rf7+ {Also wins for White}) 3. Ree1+ Kf8 4. Be7# 1-0