Cross-cut then extend
The proverb cross-cut then extend (or the first to extend from a crosscut has the advantage) is somewhat misleading. There has been a lot of criticism that can be read at the /Technical Discussion page. A way to interpret the proverb is to reduce it to a not so common situation:
- When there are no other stones nearby, extending from the crosscut gives the advantage
Some diagrams to explain.
An isolated cross-cut. Black to play.
After the more defensive-looking extension it is White's turn. However, White has to make a choice of which stone to strengthen. This is in fact an application of the 1-2-3 principle: if you are going to strengthen at in the previous diagram, why not do it at once as in this diagram.
this part has been added recently and urges review
Playing atari and setting up for a nose tesuji may be playable though.
- A thorough treatise can be read in Richard Hunter's Cross-Cut Workshop
- Haengma tutorial for beginners/Cross-cut position
- /Technical Discussion
- Crosscut? Extend! wording discussion
- Crosscut - Reasons to atari
- Atari from crosscut
Bill: Right now this page seems too sparse. How much help is it to someone who does not already know the proverb? (I am commenting here because I expect to delete this note later. :))