Vanished opponents...what to do?

[Vesku]

Simple question: two of my opponents have ceased to reply my emails (for over a month), I have had a game going with them for some time. Now, is there an unwritten rule of what to do if an opponent goes MIA and will not answer if asked whether they will continue the game or not? Anybody have similar experiences?...

I know at times I have not been very quick in my replies, but I never just disappear/ignore my opponent.

I usually report the game after reasonable wait as it looked like it would have ended. If the oppo returns you can always delete the report and continue playing.