The man versus machine dilemma is back to square one.
Korean Go master Lee Se-dol lost the second match in a three-game series against locally-developed AI program HanDol.
"The probability of losing was high, so it is what it is. But I made a ridiculous mistake in the beginning which led to an easy win for HanDol. That's a shame."
After winning the first match on Wednesday with two handicap stones set on the grid to begin the game,the 36-year old played Thursday's showdown on a level field against the AI without any advantages.
Dozens of reporters gathered to see if Lee could pull off another improbable win just like when he beat Google's AlphaGo in 2016.
Lee tried to put up a fight even after his consecutive mistakes in the early stages of the game,but he had to eventually resign at the 122nd turn.
"Although I prepared a lot for the first match, that was not my playing style. I was focused on winning. So for the third and last game, win or lose, I'm going to play like I usually do."
The Korean Go master announced his retirement last monthciting AI as an entity that he could not beat anymore.
During his 24 years as a professional Go player, Lee won 18 world championships and 32 Korean titles.
"Saturday’s final match will take place in Lee's hometown of Sinan County, Jeollanam-do Province where the South Korean Go master will look to finish off his career with a win. Kan Hyeong-woo, Arirang News."