4-4 point diagonal attachment, pincer (without one-space jump)
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In the 4-4 point diagonal attachment, one-space jump (without pincer) page, it was mentioned that is usually not a good move. In this page, we discuss the case when is played at a pincer (at or around ) instead.
One may want to compare and contrast this sequence with the 4-4 point diagonal attachment joseki.
If here instead of in the previous diagram, White can cut and squeeze. When Black captures at a, White will protect her cutting point at b or c. This takes the fire out of the attack.
If is played immediately, without a favourable ladder, it might be an overplay. See the Sakata-Go game in the next section.
Here, the diagonal attachment against the weak Black stone at allows Sakata play in sente. There is some number of games where White has a wall of three or more stones one space to the right of or where and were played before the touch of .
White lives in the corner, and Black lives on the side. In the game it was possible to exchange b for c before playing at .
However, Black (Go Seigen) won the game.
A very detailed commentary of the whole game can be found at http://www.wingsgoclub.org/books/go-seigen-book.pdf.
Most of the time, this is not a good idea. Without going into all the tactical complications, we can say that makes it easier for White to sacrifice and . Without that move it is difficult to throw them away. With the left side open, is quite likely to be worse than an extension down the left side. One will also need to take into account that for White to invade at , the left side is usually not open.
After , at any of a to e is worth considering, particularly since White may throw and away.