Dave Sigaty / Work in Progress

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Diagonal attachment  
3-space high pincer  

The 3-space high pincer (or the invasion of the 5-space high extension) is what might be called the "base case" for the diagonal attachment. This is because it is a fundamental position in high-handicap Go. As a result, it appears often in books for beginners or for those trying to improve their play against stronger players. The analyses that we see in such books normally assume that the upper right corner is Black. This may or may not be the case in actual play. Many of the analyses are also based on having a Black stone on the left side at a or a point nearby. This also may differ in actual play.

Basically if there is no Black stone around a, there must be a reason why White does not play from the open side at b. This may be that the position in the lower left makes it very unlikely that White can make territory along the left or that there is a strong White position in the upper right that will allow White to attack the marked Black stone.

3-space high pincer - 2  

White has enough space to extend to W4 and this is by far the most frequent line of play chosen by White at the professional level. There are many possible continuations for Black depending on the surrounding circumstances. The jump to B5 is the one most often seen in actual play. The diagonal play at a instead of B5 is often seen in books but seems a little too slow between pros. It was used in the 1970's and early 80's but has more or less died out since then. The Black play at b instead of B5 is an important idea when the left side is important for Black.

3-space high pincer - 3a  

The low extension at W1 here is also played. This threatens to slide underneath the marked stone to 6. The diagonal attachment at B2 is one answer, most often leading to the standard exchange of 3-9.

3-space high pincer - 3b  

The calm descent to B2 here seems better. It prevents the slide but gives White less to work with. White normally jumps out to W3 anyway but after B4, if White plays at a, Black will play around b, while if White plays b, Black will play around a.

Dave Sigaty / Work in Progress last edited by DaveSigaty on January 2, 2007 - 03:57
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