[Comment "auto-generated from http://www.jesseo.com/chesspublishing/pgn.php?pgndata=[Event%20%26quot;New%20York%20sim%26quot;]%0A[Site%20%26quot;New%20York%26quot;]%0A[Date%20%26quot;1859.??.??%26quot;]%0A[Round%20%26quot;?%26quot;]%0A[White%20%26quot;Morphy,%20Paul%26quot;]%0A[Black%20%26quot;Jefferson,%20BT.%26quot;]%0A[Result%20%26quot;1-0%26quot;]%0A[ECO%20%26quot;C52%26quot;]%0A[Annotator%20%26quot;Wilson,Glenn%26quot;]%0A[PlyCount%20%26quot;45%26quot;]%0A[EventDate%20%26quot;1859.??.??%26quot;]%0A[Source%20%26quot;ChessBase%26quot;]%0A[SourceDate%20%26quot;1998.11.10%26quot;]%0A%0A1.%20e4%20e5%202.%20Nf3%20Nc6%203.%20Bc4%20Bc5%204.%20b4%20Bxb4%205.%20c3%20Bc5%206.%20O-O%20d6%207.%20d4%20Bb6%208.%20dxe5%0Adxe5%209.%20Qb3%20Qf6%2010.%20Bb5%20Be6%2011.%20Qa4%20Nge7%2012.%20Bg5%20Qg6%2013.%20Bxe7%20Kxe7%2014.%20Bxc6%0Abxc6%2015.%20Nxe5%20Qf6%2016.%20Nxc6+%20Kf8%20%26%23123;Qa3+%20now%20forces%20mate%20(as%20we%20will%20see%20in%20a%20few%0Amoves)%20except%20that%20the%20black%20queen%20protects%20e7.%EF%BF%BD%20How%20does%20Morphy%20chase%20the%0Ablack%20queen%20off%20the%20d8-h4%20diagonal?%26%23125;%2017.%20e5%20$1%20%26%23123;Deflects%20the%20black%20queen%20from%0Af6.%20Now,%20g5%20is%20the%20only%20safe%20square%20for%20the%20black%20queen%20on%20the%20d8-h4%20diagonal.%26%23125;%0AQg5%2018.%20h4%20$1%20%26%23123;Deflects%20the%20black%20queen%20from%20g5.%26%23125;%20Qg4%20%26%23123;Mission%20accomplished.%0ANow%20Morphy%20finishes%20the%20game%20with%20Philidor%27s%20Legacy%20mating%20pattern.%26%23125;%2019.%20Qa3+%0AKg8%20(%26%23123;%0AThe%20black%20queen%20not%20longer%20protects%20the%20e7%20square,%20so%20Ke8%20allows%20a%20mate%20in%20one:%0A%26%23125;%2019...%20Ke8%2020.%20Qe7%23)%2020.%20Ne7+%20Kf8%2021.%20Ng6+%20%26%23123;%0AA%20Double%20Check%20from%20the%20queen%20and%20knight.%26%23125;%20Kg8%2022.%20Qf8+%20$1%20%26%23123;%0ADecoys%20the%20black%20rook%20to%20f8%20and%20trapping%20the%20king.%26%23125;%20Rxf8%2023.%20Ne7%23%20%26%23123;%0AA%20smothered%20mate.%26%23125;%201-0%0A"]
[Event "New York sim"]
[Site "New York"]
[Date "1859.??.??"]
[Round "?"]
[White "Morphy, Paul"]
[Black "Jefferson, BT."]
[Result "1-0"]
[ECO "C52"]
[Annotator "Wilson,Glenn"]
[PlyCount "45"]
[EventDate "1859.??.??"]
[Source "ChessBase"]
[SourceDate "1998.11.10"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Bc5 6. O-O d6 7. d4 Bb6 8. dxe5
dxe5 9. Qb3 Qf6 10. Bb5 Be6 11. Qa4 Nge7 12. Bg5 Qg6 13. Bxe7 Kxe7 14. Bxc6
bxc6 15. Nxe5 Qf6 16. Nxc6+ Kf8 {Qa3+ now forces mate (as we will see in a few
moves) except that the black queen protects e7.� How does Morphy chase the
black queen off the d8-h4 diagonal?} 17. e5 $1 {Deflects the black queen from
f6. Now, g5 is the only safe square for the black queen on the d8-h4 diagonal.}
Qg5 18. h4 $1 {Deflects the black queen from g5.} Qg4 {Mission accomplished.
Now Morphy finishes the game with Philidor's Legacy mating pattern.} 19. Qa3+
Kg8 ({
The black queen not longer protects the e7 square, so Ke8 allows a mate in one:
} 19... Ke8 20. Qe7#) 20. Ne7+ Kf8 21. Ng6+ {
A Double Check from the queen and knight.} Kg8 22. Qf8+ $1 {
Decoys the black rook to f8 and trapping the king.} Rxf8 23. Ne7# {
A smothered mate.} 1-0