South Korean Go player Lee Se-dol, who famously once beat the AI AlphaGo, has lost his latest match against a Korean-made AI called HanDol.
This was the second match in a three-round series for Lee's retirement, and it ended just minutes ago.
Lee lost on the 122nd stone.
In today's match, Lee did not get to start with two extra stones on the board as a handicap like he did on Wednesday.
Lee won that match with a brilliant move that caused HanDol to resign.
The tie-breaker will be held on Saturday in Lee's hometown of Sinan County, Jeollanam-do Province.