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.
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 was much fewer IM's back then - probably puts the game into the GM level category.Tweet