In
Game 11414934 with me they played a clear truce/alliance even if they never chatted. Just read the log of the game with the deployments and reinforcement they did: when we 3 were still even, Woly2012 holding europe and africa put all his troops in Mumbai and flashheart holding NA and SA put all his troops in Magadan with low or no protection between their borders!?! Then suddenly Woly suicided against me in bangkok (It was 80 against 75!) and he gave the game to Flashheart...
The secret diplomacy was so obvious in that game that I went to check their walls and the games they had played together:
They both live in UK.
Woly joined CC 1 day after Flashheart.
They have played 65 games together, 35 of which are standard games with 3+ players. They won 25 out of the 35 games and in 19 they were the last two left in the game.
After all this I have no doubt they play systematically in team and they have cheated in over 30 games so far.