The study was published by the developer of eXtreme Gammon, so it is up to you if you want to fully trust the outcome. My impression is that eXtreme Gammon is definitely faster than the other bots and that it's playing strength is at least equal. But there is much more to XG than speed and strength! It analyses your game in the background while you are playing. It doesn't evaluate it's own play as perfect i.e. when the rollout or deeper analysis shows that your move is better than the one initially chosen by the software, your move is marked as an outplay. You have a bunch of different playing modes to choose from e.g. the free mode where you get the analysis results right after you moved your checkers or the iron man mode, where the program doesn't show you anything not even the pipcount and the analysis result is automatically stored in the player statistics without you beeing able to cancel it, so you cannot cheat yourself. You can also perform batch analysis and match rollouts. And it is very easy to record live matches. The list is endless. The software is full of features and new brilliant ideas. The only thing that annoyed me after I bought it was the fact that I hadn't done that much earlier!

Greetings,
Thomas

I have it and found it great