The combination is the heart of chess.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "White player"]
[Black "Black player"]
[Result "*"]
[BlackElo "0"]
[FEN "8/1k1PK1rp/1P4p1/8/3p4/1R5P/8/8 w - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
{ Of Triangles and Tempos.|White to move and win.|Note that white is in
check, and must move out of check. } 1. Ke8 Rg8+ 2. Kf7 Rd8 3. Ke7 { White
triangulated his king to a superior position. } 3... Rg8 4. d8=Q Rxd8 { White wins
with a large material advantage. } 5. Kxd8 { White wins with a large material
advantage. } *