The combination is the heart of chess.
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[Event "Postal Game"]
[Site "?"]
[Date "1973.??.??"]
[Round "?"]
[White "Endzelins, Lucius"]
[Black "Dunhaupt, Hans"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "r5k1/2q2pb1/3p2p1/1R1P2P1/2p1QP2/P7/K1P3R1/8 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Qd7 ( { Black can try: } 1... Rxa3+ 2. Kxa3 Qa7+ 3. Kb4 Bb2 4. Qe8+ Kg7 5. Rg3 Bd4 6. Kxc4 Qa4+ 7. Kd3 Bc5 8. Rb8 Qd4+ 9. Ke2 Qf2+ 10. Kd1 Qxg3 11. Qh8# ) 2. Rb4 Qh3 3. a4 ( { White can try: } 3. Ra4 Rxa4 4. Qe8+ Kh7 5. Qxa4 Qxg2 6. Qxc4 Qh2 { Black wins with a large material advantage. } ) ( { White can
also try: } 3. c3 Qxc3 4. Qxc4 Rxa3+ 5. Kb1 Ra1# ) 3... Qc3 4. Qxc4 Rxa4+ 5. Kb1 ( { White dare not try: } 5. Rxa4 Qb2# ) 5... Ra1# ( 5... Qa1# ) ( 5... Qe1# ) 0-1