Morphy was probably the greatest genius of them all.
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[Event "ICS rated blitz match"] [Site "freechess.org"] [Date "2002.03.30"] [Round "?"] [White "dah"] [Black "kix"] [Result "1-0"] [Annotator "Hayes, David"] [BlackElo "1881"] [ECO "A00"] [TimeControl "0"] [WhiteElo "1613"] { Black sacrifices material for wild play. White has no time for castling. } 1. g4 { A00: Irregular Openings } 1... d5 2. Bg2 Bxg4 3. c4 c6 4. cxd5 cxd5 5. Nc3 e6 $4 { More common and accurate is 5... Nf6 6. Qb3 Nbd7 7. Nxd5 effectively trading a center pawn for a flank pawn. } 6. Qa4+ Nc6 7. Qxg4 { Despite being down in material, black has some compensation. Black owns the center, and can develop rapidly. White cannot afford the luxury of castling. } 7... Nf6 8. Qa4 Bd6 9. Nf3 O-O 10. d4 e5 { Black is down material and now hopes to break open the center for an attack on white's uncastled king. } 11. dxe5 Nxe5 12. Bg5 Re8 13. Nxd5 $1 Nd3+ 14. Kf1 Nc5 15. Qh4 Be7 16. Nxf6+ Bxf6 17. Bxf6 gxf6 18. Rg1 Kh8 19. Bh3 Rxe2 { A trap! Now the greedy 20. Kxe2?? is punished with mate by 20... Qd3+ 21. Ke1 Re8+ etc. } 20. Bf5 { Who's afraid of the big bad rook? } 20... Re1+ { No better is 20... Rxf2+ 21. Kxf2. } 21. Rxe1 { A demonstration by white that there is no real need to castle. } 1-0