The combination is the heart of chess.
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[Event "rated untimed match"]
[Site "?"]
[Date "1973.??.??"]
[Round "?"]
[White "Samarin"]
[Black "Kolesov"]
[Result "1-0"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "r1bq1rk1/pp1n1ppp/1b3n2/2pNp3/4P3/3B4/PPPBNPPP/R2QK2R b KQ - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
{ Hint: White has not castled. } 1... Nxd5 2. exd5 c4 3. Bxc4 Qh4 4. O-O Qxc4 { Black wins with a large material advantage. } 1-0