A Correspondence Sveshnikov

I play various Sicilians against 1.e4. The Sveshnikov holds up well in CC. The game below is from board 8 in the currently running North Atlantic Team Tourney VI. Move 18...f4 is shown by Fritz as the end of theory and you won't find it in Mega 2009, but it has been played in one prior correspondence chess game. This is to my knowledge, though, the first successful effort by black. The annotations below, excepting the earlier game reference, are entirely by Fritz 12.