Same is happening now in game starcraft
Few years ago even strongest starcraft bots could easily lose to amateurs and even noobs. Even today bots are still rule-based, which means they are extremely stupid once they encounter something they are not coded to respond.
But... that started to change little bit by now. And thanks to improved makro, micro and other aspect of the game... bots started to win games against humans. And not just noobs. They have started to win against decent amateurs with pretty good understanding and experience of the game. Still human will remain the smartest and better for upcoming couple years at least.. but that does not mean bots are bad. They are coded by smart humans, dont forget that.
Today top bots have decent opening, very good makro skills and good micro skills. They have thousands of APM. Reaction time is pretty much instant. Bot does not get tired or slow. He is everywhere at any time and can control many things at once. So human vs human tactics like make distraction with this unit so you attack with other unit over there does not really work. If the bot is coded to do this thing if tha happens it will do it.
Example storm dodging. Even pro humans lose units to storm in PvZ. But they can predict when other human could storm. But a bot can storm dodge instantly. Bot can seperate irradieted mutalisk from the stack instantly. They are better than pro humans in that scenario. You see where im going. Little by little bot do things better than even pro humans. And now is pretty much the time to test and see how much those bot things can help the bot to win games...
And i can tell you that... even tho bots have critical holes which can cost them the game pretty much instantly... they are getting stronger and stronger.
If you are D- D D+ C- Iccup rank player or Under 1400 at europe server you will have heck a lot of hard time winning against the bot. I can say that because i have seen better players lose to bots. That does not mean bot skill is equal to human skills.. no no.. Bots could stil lose to D+ rank.. and beat say B- rank player. The gap is big and this topic could help us see where exactly today bots stand.
If you are interested playing them and stream the games post a comment and we will do it.