In the previous content, we talked about:
There is a key point in the life-and-death norm - "five-five" and "five-five" and "five-five". This is where the two sides must fight, and can decide whether the chess shape lives or dies.
So, let's continue to expand the shape, that is, enclose six intersections.
"Straight Six" and "Bend Six" are all living types, which have been introduced in the previous content, so I won't repeat them here. Here we mainly look at some special "six".
Grape Six
As shown in Figure 1, black encloses the five positions of xxxxxx, which are shaped like a bunch of grapes, so it is called "grape six".
As shown in Figure 2, you can see that the position in the middle of the "Grape Six" chess shape is the key point of the chess shape, and if it is the turn of black to move, black 1 walks at the key point and works directly. 
As shown in Figure 3, if it is white's turn to move, white 1 walks at the key point of the black chess shape and can kill the black disc. If black 2 walks to the right of white 1, white 3 long destroys black's eye position and kills black.
As shown in Figure 4, if white 1 and black 2 walks on the top of white 1, white 3 can also destroy black's eye position and kill black.
It can be seen that "Grape Six" is similar to "Plum Five", "Knife Five" and "Ding Four", and the middle position is the key point of the chess shape, which is the place where the two sides must fight, and can determine the life and death of the chess shape.
When encountering this kind of position, it must be occupied first, and cannot be left to the other party.
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Engineering dog, who has been playing chess since elementary school, hopes to make everyone feel happy in Go