Interactive Example:
Holes

NO. 91 ... p130-131, The Hole at Q3, Paulsen v. Morphy, 1857

PGN

[Event "**Rd--()-, New York"]
[Site "**Rd--()-, New York"]
[Date "1857.??.??"]
[EventDate "?"]
[Round "?"]
[Result "0-1"]
[White "Louis Paulsen"]
[Black "Paul Morphy"]
[ECO "C48"]
[WhiteElo "?"]
[BlackElo "?"]
[PlyCount "56"]

1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bc5 5. O-O O-O 6. Nxe5 Re8 7. Nxc6 dxc6 8. Bc4 b5 9. Be2 Nxe4 10. Nxe4 Rxe4 11. Bf3 Re6 {PCC p.130 No. 91}12. c3 Qd3 13. b4 Bb6 14. a4 bxa4 15. Qxa4 Bd7 16. Ra2 Rae8 17. Qa6 {Morphy took twelve minutes over his next move, probably to assure himself that the combination was sound and that he had a forced win in every variation. -- Chernev} Qxf3 {!!} 18. gxf3 Rg6+ 19. Kh1 Bh3 20. Rd1 {Not 20 Rg1 Rxg1+ 21 Kxg1 Re1+} Bg2+ 21. Kg1 Bxf3+ 22. Kf1 Bg2+ {The "quiet" 22...Rg2! would have won more quickly. Zukertort gives: 23.Qd3 Rxf2+ 24.Kg1 Rg2+ 25.Kh1 Rg1. } 23. Kg1 Bh3+ 24. Kh1 Bxf2 25. Qf1 {Absolutely forced.} Bxf1 26. Rxf1 Re2 27. Ra1 Rh6 28. d4 Be3 0-1

End.