I'm constantly telling myself I should be communicating more. Sometimes it is the effort of wondering what to say that stops me. When you've just stabbed someone, taken (hopefully) a couple of SCs, or at least an SC when he's committed his forces away from your's, and you picture him opening the game to see the adjudication for the first time and seeing the betrayal... Well, it is only a game, but when
I am the one in that position I know how
frustrated I feel that he would be SO STUPID as to do that NOW!!!

So I know what Chosen means:
TheChosen1 wrote:But I am having one problem with that, and that is the first message, how can I start a conversation with someone I just attacked? How can I make sure he'll answer me back?
That first post-betrayal message is tough to put together. And if the player doesn't respond, then trying to encourage a response by messaging again, after another turn when you have
had to press on with the attack (after all, you expected some come back from him), is even more difficult.
But one key is to have decent communication from the start. Not
just the strategic stuff, but other things, too. Finding something in common, throwing out the odd question that isn't related to the game, having a bit of a chat... in other words, trying to build some kind of relationship that isn't only based upon the game, establishing a likeable personality. if that is what you've managed to do, then continuing with some form of communication then is easier.