user587: What is the shortest known on the board game played between GM rated players that ended with a checkmate? "Shortest" does not mean the game has to be very short. 
Note: Edited this question twice clarifying some ambiguity. 

user1485: Reti-Tartakower, Vienna 1910, must be a good candidate, although Tartakower resigned one move before checkmate.
[FEN ""]
[Event "Vienna"]
[Date "1910"]
[Result "1-0"]
[White "Richard Reti"]
[Black "Savielly Tartakower"]

1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Nf6 5. Qd3 e5 6. dxe5 Qa5 7. Bd2 Qxe5 8. O-O-O Nxe4 9. Qd8+ Kxd8 10. Bg5++ (10. Bg5++ Ke8 (10... Kc7 11.Bd8#) 11.Rd8#) 1-0


user618: Keres-Arlamowski 1950, comes very close
[FEN ""]
[Event "Szczawno Zdroj"]
[Date "1950"]
[Result "1-0"]
[White "Paul Keres"]
[Black "Edward Arlamowski"]

1. e4 c6 2.Nc3 d5 3.Nf3 dxe4 4.Nxe4 Nf6 5.Qe2 Nbd7 6.Nd6# 1-0

I heard Mr Arlamovski was an IM at the time - but given Keres' level, and the fact that there were many fewer IM's back then - probably puts the game into the GM level category.

587: <p>What is the shortest known on the board game played between GM rated players that ended with a checkmate? "Shortest" does not mean the game has to be very short. </p>

<p>Note: Edited this question twice clarifying some ambiguity. </p>
 1485: <p>Reti-Tartakower, Vienna 1910, must be a good candidate, although Tartakower resigned one move before checkmate.</p>

<pre><code>[FEN ""]
[Event "Vienna"]
[Date "1910"]
[Result "1-0"]
[White "Richard Reti"]
[Black "Savielly Tartakower"]

1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Nf6 5. Qd3 e5 6. dxe5 Qa5 7. Bd2 Qxe5 8. O-O-O Nxe4 9. Qd8+ Kxd8 10. Bg5++ (10. Bg5++ Ke8 (10... Kc7 11.Bd8#) 11.Rd8#) 1-0
</code></pre>
 618: <p>Keres-Arlamowski 1950, comes very close</p>

<pre><code>[FEN ""]
[Event "Szczawno Zdroj"]
[Date "1950"]
[Result "1-0"]
[White "Paul Keres"]
[Black "Edward Arlamowski"]

1. e4 c6 2.Nc3 d5 3.Nf3 dxe4 4.Nxe4 Nf6 5.Qe2 Nbd7 6.Nd6# 1-0
</code></pre>

<p>I heard Mr Arlamovski was an IM at the time - but given Keres' level, and the fact that there were many fewer IM's back then - probably puts the game into the GM level category.</p>
