There is a way to compile GoGui so it is a mac app. Through it you can play against GnuGo (brew install gnugo), fuego (brew install fuego), or pachi (compile y

There is a way to compile GoGui so it is a mac app. Through it you can play against GnuGo (brew install gnugo), fuego (brew install fuego), or pachi (compile yourself). With it, you can also learn a lot by making an AI play starting at a certain move, or making AI's play against each other. You can also buy Goban from the app store to play GnuGo or Pachi (both bundled), but it is a bit buggy (and not really better than the older free version). They do respond to bug reports though so it sounds like they are actively working on it. Start out playing 9x9 against GnuGo. Give yourself a 9-stone handicap, you should probably win. Take away handicap stones until you can win with a 3 stone handicap. In general you don't want to play an AI at less than 3-stone handicap or you will learn bad habits. At that point, play against GnuGo 19x19 with a 9-stone handicap. If you are a beginner around 20kyu, you will find it a challenge to win. I've been practicing consistently for the past couple of months. I do problems on goproblems.com or from a few iPhone apps. I've played a couple of games against ranked bots on kgs and am ranked 15kyu there since I beat a popular 16kyu-ranked bot. KGS is inflated through so I'm probably around 20kyu, still a complete beginner. I beat GnuGo 19x19 at a 9-stone handicap but not quite yet at an 8-stone handicap. Once you are able to beat GnuGo 19x19 at a lower handicap then you can start playing against Fuego or Pachi. But at that point you should also already be playing humans regularly - it's a very different playing style in that you'll come across clearly bad moves that you will have to learn to recognize and take advantage of.