For quite a long time, a common opinion in academic world was that machine achieving human master performance level in the game of Go was far from realistic. It was considered a ‘holy grail’ of AI – a milestone we were quite far away from reaching within upcoming decade. Deep Blue had its moment more than 20 years ago and since then no Go engine became close to human masters. The opinion about ‘numerical chaos’ in Go established so well it became referenced in movies, too.
Surprisingly, in march 2016 an algorithm invented by Google DeepMind called Alpha Go defeated Korean world champion in Go 4-1 proving fictional and real-life skeptics wrong. Around a year after that, Alpha Go Zero – the next generation of Alpha Go Lee (the one beating Korean master) – was reported to destroy its predecessor 100-0, being very doubtfully reachable for humans.