Match 3, closing out the Future of Go Summit, once again showcased exciting and surprising moves from both sides in a game full of initiative and innovation.

The first opening surprise in this game arose almost immediately on move 7, a four-space extension from the upper right in which AlphaGo played one space closer to the corner than in the usual Chinese opening. Ke Jie, playing White, took advantage of the wider space on the right side to approach the lower right corner, and both sides continued to position themselves in an opening that AlphaGo evaluated as ideal for both sides.

White 20 in particular, a counter-intuitive second-line probe into Black's framework on the lower right, showcased Ke Jie's sublime positional judgment. With the combination of 40 through 44, a peep followed by a push and cut, Ke Jie divided the lower left into several groups to set up a complex position with endless variations. As commentator Hajin Lee remarked, while Ke Jie had played a territorial style in the first match and a complication-seeking style in the second, he pursued a combination of these approaches in the third match.

Black 59, loosely enclosing White's group in an indirect response to White's approach on the lower side, was a beautiful move by AlphaGo that set up a sequence to build strength in the centre before connecting. Ke Jie responded with a spirited counter, temporarily leaving the left side to establish a group in the lower right and wait for future opportunities. Black and White's groups began a vigorous dance in the centre, matching each other's weaknesses and strengths to create a delicate balance.

When Ke Jie attained a local advantage in the centre, AlphaGo switched to build a powerful framework on the top that spurred White to invade. The action came to a head when Ke Jie sacrificed the territory on the upper side to AlphaGo, gaining initiative to pressure the lower left. After AlphaGo protected its group, the match proceeded towards the endgame. Ke Jie revived his stones in the upper left to take the territorial lead, but this sequence left AlphaGo just enough latitude to take control of his group in the centre, and White resigned after 209 moves.

Ke Jie created complex situations with many interlocking battles, demonstrating an incredible ability to keep AlphaGo guessing. We hope that this special series of matches can serve as a platform for analysis and new knowledge for Go players and the Go community. It was thrilling to watch the games unfold, and it has been a huge honour for all of us to have the chance to play with such a great master, Ke Jie.