Google's AlphaGo loses in fourth Go game by S. Korean player
Google DeepMind's AlphaGo was defeated Sunday by Lee Se-dol, the South Korean player that the program had defeated in three consecutive games.
The loss stymies the AI system's prospects of equaling a 5-0 win against an European Go champion in October.
A move by Lee, described by commentators as "brilliant," was followed immediately after by a mistake by the computer program, leading Lee to say that AlphaGo, though a formidable opponent, has weaknesses or bugs that degrades its performance when faced with unexpected moves. It also does not perform as well when it has to play with black pieces and has to start the board game.
The fifth and final game in the contest is being played Tuesday. AlphaGo won the tournament on Saturday with three consecutive wins against Lee. But the player warned after that game that the program made different and sometimes superior moves than human beings, but also had weaknesses.
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