Game: 2017.08.28_AlphaGo-AlphaGo_Game 05 annotated-draft version
          Event: AlphaGo-AlphaGo
          Round: Game 5
          Commentor: Michael Redmond 9P
       
          - - -
       
          Black ( X ): AlphaGo
       
          White ( O ): AlphaGo
       
          Komi: 7.5
          Rules: Chinese
       
       
       
       Move #25
       
          A B C D E F G H I J K L M N O P Q R S
        1 . . . . . . . . . . . . . . . . . . .
        2 . . . . . . . . . . . . . . . . . . .
        3 . . . O . O . . . . . . . . X O . . .
        4 . . O . . . . . . . O . . . X . O . .
        5 . . O X . . . . . . . . . . . . . . .
        6 . . X X . . X . . . . . . . . . O . .
        7 . . . . . . . . . . . . . . . . . . .
        8 . . . . . . . . . . . . . . . . . . .
        9 . . . . . . . . . . . . . . . . . . .
       10 . . . . . . . . . . . . . . . . . . .
       11 . . . . . . . . . . . . . . . . . . .
       12 . . . O . O . . . . . . . . . . . . .
       13 . . X X X . . . . . . . . . . . . . .
       14 . . . . . . . . . . . . . . . . X . .
       15 . . . . . . . . . . . . . . . . . . .
       16 . . . X . . . . . O . . . . . X . . .
       17 . . . . . . . X . . . . . O . . . . .
       18 . . . . . . . . . . . . . . . . . . .
       19 . . . . . . . . . . . . . . . . . . .
       
       Black 25 is an important point that increases Black's potential on the upper side and reduces White's left side. AlphaGo plays these kinds of moves fairly early in all these games, so it clearly considers this to be a very big move. An extension towards the side, at, say, A, would not be very satisfying, taking White on a small scale. In fact, a lot of Black's plays here are aimed at making the upper side important on a large scale. White's trying to start something in the lower left and Black doesn't want to be pushed around here. 
       
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       Created with:
 (HTM) sgf2gopher