This might be irrelevant to what you want to discuss, but as a player, I enjoy playing against a real human much more than against a bot or system; this is because, at certain difficulty levels, they tend to use almost the exact same strategy. Which is why playing repeatedly against the same system can start to get a bit boring. So, this is just my suggestion based on my real experience is that either you should make your system smart enough to automatically adjust its strategy based on the opponent's moves, OR make the game popular enough that—at any time of day—anyone hitting the 'play' button is guaranteed to find a real player from somewhere in the world.