Block - a simple one
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Black blocks on P15 to snatch the upper left side from White ...

The fifth point on a diagonal is fairly popular as an opening move. This section reveals some of the implications of a simple block, a move that snatches one of the sides away from an opponent's stone on a diagonal. The scenario at the top is fairly straightforward.
White is satisfied with the corner and black comes out in a situation Go players will recognize as gote, that is: after white takes the corner, the black group is in danger of being killed and black must reply with a move like o9, to create a point of escape if white starts pushing along the o-line.
The scenario at the bottom is self explanatory: white's pushing action is carried rather far and white 16 is a mistake that loses the game.