3-3 point shoulder hit
The shoulder hit of is a common way of playing against the black stone in the corner. Black will almost always answer with the basic technique of pushing at (see which way to push) and White will mostly stretch at . Jumping to a instead is treated below.
Black's keima slide is the most common move.
It is clear that in this joseki, White is making outside influence, while Black goes for the corner territory. Next, the jump at a, continuing to emphasize the outside, is White's most common move. White can block at b, taking the left side, which is also discussed further. White can play tenuki and regard the white stones here as kikashi. GoBase shows some examples of professional games where c to e were tried.
After , is considered correct shape.
next makes nice shape as well, but it may be too slow, so White will often play tenuki instead. For that reason, can also be omitted, giving Black the first chance to play elsewhere.
The white blocking move at gives up White's quest for central influence, and focuses on the left side instead. is the natural response, playing in the direction White neglected to play.
After White stabilizes the group by the extension to or a, the joseki comes to an end. Black should take this joseki into account when choosing between and b: it is often correct to play on the side where blocking with here is least interesting.
If Black gets to be the first to play in this corner after the basic joseki, Black will almost invariably choose . The white stones jump to safety with , after which Black plays at to deny White an easy base.
White, however, can also choose to ignore and leave the stones to themselves: even if they are captured, Black will have to use so many moves to do so that it is not in all positions disadvantageous for White.
Kogo's dictionary? lists as a mistake. However, there are 30+ pro games on GoBase with this move. Many of them have special surrounding positions that make this move reasonable. When the position around this corner is fairly open, the pros generally play as in this diagram.
Black's turn may be a natural one to occur to many players. In fact, it is not wrong and White must be very careful responding.
Timm: What do a and b correspond to ?!
is a mistake and puts in on the spot.
If White resists, the cut at favours Black. If White submits with at , at gives Black territory while White gets bad shape.
Therefore, White usually jumps to and to keep up with the exchange of central influence for territory.
After , it is usual for Black to play at a or b.
One example from BQM87:
When is in place, it makes sense to play before (or a); now White at b makes too close, and also Black has simply taken more territory and eye space here. This way of playing can be seen in pro games.
The common continuation in this pushing battle. White's influence is bigger than in the joseki. Black's marginal increase of territory may be inferior to that gain.
After , White sometimes leaves the situation for a while treating the stones as kikashi.
Quite a few pro games feature this . You would expect White to answer at a, making Black push from behind, but this is not the case.
Probably White plays because there is a need to play lightly. Playing at a would not be in accordance with this need.
Charles: I could only find one such game (1962-11-15, on Gobase, none on Gogod). was at b, which even I would have played. In that game Black had a stone at c.
Imagist: In a Go Winds I saw a few months back, the shoulder hit/ladder breaker combination at was referred to as "unbearable". Kato Masao (colors reversed) took (what looked to me like) a large loss locally to avoid the ladder pointing at his 3-3 point, so this is pretty huge.
If tenuki, makes matters worse for White than not approaching this position at all.
While seems to be too close, looks like kikasare. Black a looks like the normal response.