Using the two point jump to sacrifice
The two point jump is often made with the intention of sacrificing a stone.
, a one point jump is the basic move for defence. However, in this position it may be too heavy. White exchanges for and stays ahead of Black's stones with and , while these face white thickness below.
If we interchange - in the previous diagram: White not only cuts off a stone, but more importantly and are harmed by and .
Instead, here will treat lightly and suffice with reducing the size of White's framework. It is more difficult to attack this structure on a large scale. If White cuts off with and , the black stones are unharmed.
This is from a game Lee Changho (white) vs Rin Kaiho, played on 27th January 1992. Black has just played , and white wants to prevent black from capturing on a large scale. Moving out with a would be too heavy.
This is the continuation. Later in the game black plays at a and captures , but and are able to connect to safety, so white's aim is achieved.
White has just played , and black needs to do something about white's central framework.
aims at the cutting point in white's shape. Playing at a would lack fighting spirit, so white attacks on a large scale with and . Black makes a light and flexible shape. Later in the game and are captured, but white only gets a small territory in the centre, and black wins the game.
The complete game record can be viewed at http://www.go4go.net/v2/modules/collection/sgfview.php?id=14101
Here we see the two point jump at work again. Black's most common response to is at here, although any of a through d can be played (see 3-4 point low approach two-space high pincer two space jump). White should not be afraid of black cutting through the two point jump:
In this diagram, is bad style, sometimes described as vulgar. White is happy to sacrifice , in exchange for hurting . ( is the simplest way to play, but at a or at is also possible.)
This is a better way to cut. White will probably continue at one of a, b or c, and black aims to play d soon. Again there is the possibility of an exchange (both and might end up captured), but this time with a result that is fair to both sides.