Inventing winning moves

This game earned AlphaGo a 9 dan professional ranking — the first time a computer Go player had received the highest possible certification.

During the games, AlphaGo played several inventive winning moves. In game two, it played Move 37 — a move that had a 1 in 10,000 chance of being used. This pivotal and creative move helped AlphaGo win the game and upended centuries of traditional wisdom.

Then in game four, Lee Sedol played a Move 78, which had a 1 in 10,000 chance of being played. Known as “God’s Touch”, this move was just as unlikely and inventive as the one AlphaGo played two games earlier — and helped Sedol win the game.

Players of all levels have examined these moves ever since.