Uberdude wrote:
Here's my analysis with LZ 207 about why block other side for 199 was better. Conclusion, it is: having the stone at g13 comes in very useful 40 moves later when black wants to counterattack against white's middle group in a semeai he can then win by 1 liberty, or creating the shortage of liberties in the e10 bamboo combo-ing with e11. There are some lines where white does kill the left group but that involves ignoring a move in the middle so black captures a bunch of stones there in sente and wins anyway. The intuition of these bots to see block above better in just hundreds of playouts (<1 second) when it depends on ~40 move sequences of delicate use of aji is impressive. I expect Iyama could do it too if he had enough time and concentration though.
That sequence you found is absolutely amazing!
I wonder how much of the game did they play in byo-yomi. Yamashita was already in byo-yomi at move 196, when he is obviously wasting a ko-threat just before peeping at 198.
As for me, I feel that the most important learning from this game is the first line tesuji that Yamashita played at move 114: R19, making miai O18 and S16, just when I was wondering what is wrong with him to commit suicide with that invasion
I guess I would never have found R19 myself (unless if this was presented to me as a tsume-go).
is reminiscent of a play by Sakata, who was known for his skill at shinogi.