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Every now and again when I approach a corner, opponent plays 1-space pincer and I jump out, my opponent immediately peeps. This seems like aji keshi and bad shape, but I've been stumped as to how to really take advantage of it. Normally what I would get out of this joseki is a nice influential wall facing the center, but now it seems I must sacrifice my corner aji to get the wall.

$$cm1 Should W connect?
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . X . O . . . . . |
$$ | . . . , . . . . . , . . 1 . . X . . . |
$$ | . . . . . . . . . . . . . O . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |

If W connects (below), she is free to invade the corner in the future and can connect underneath to 4 if necessary, so is chasing B's group the way to proceed

$$cm1 W does have options...
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . 4 . X . O . . . . . |
$$ | . . . , . . . . . , . . 1 2 . X . . . |
$$ | . . . . . . . . . . . . . O . . . . . |
$$ | . . . . . . . . . . . 5 . . . . 3 . . |
$$ | . . . . . . . . . . . . . . . . . . . |

However, if the normal joseki were played out before black peeped (again, below) W would probably be happy to solidify her wall and then jump in the corner. The better way for B to cut would be 1 at 2.

$$cm1 A poor way for black to cut
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . X . X X X . O . . 4 . . |
$$ | . . . , . . . . O O O X 1 3 . X . . . |
$$ | . . . . . . O . . . . O 2 O . . . . . |
$$ | . . . . . . . . . . . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |

But without the wall already in place, W has difficulty mimicking this result. So what should W do?

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+1 excellent question –  magnetar Dec 6 '11 at 15:52
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2 Answers

up vote 4 down vote accepted

White's connection and pincer sequence in another answer works well only if White has a stone (or stones) around the star point D16 in the upper left corner. Then, the 7th stone on J16 is both a pincer and an extension.

$$Wcm1 Good for W
$$ +-------------------+
$$ |...................|
$$ |...................|
$$ |...........2.1.....|
$$ |...O....7,..45.X...|
$$ |...........a.3.....|
$$ |...........8....6..|
$$ |.............9.....|
$$ |...................|
$$ |...................|
$$ |...,.....,.....,...|

On the other hand,

$$Wcm1 Bad for W
$$ +-------------------+
$$ |...................|
$$ |...................|
$$ |......0....2.1.....|
$$ |...X....7,..45.X...|
$$ |...........a.3.....|
$$ |...........8....6..|
$$ |.............9.....|
$$ |...................|
$$ |...................|
$$ |...,.....,.....,...|

Otherwise, White should invade the upper right corner at the 3-3 point, r17 with move 5. If Black blocks at r 16, White will connect this stone to the kakari stone.

More likely, Black will block at Q17. This captures the kakari stone on O17, but Black's stones are overconcentrated.

$$Wcm1 B is overconcentrated. W is free to play at A or tenuki.
$$ +-------------------+
$$ |...................|
$$ |..............657..|
$$ |...........X.O821..|
$$ |...X.....,..X..X3..|
$$ |.............O.4...|
$$ |................9..|
$$ |...................|
$$ |...................|
$$ |...................|
$$ |...,.....,.....,...|

Either way, the White stone on O15 remains "loose," and in a position to cancel Black's outside influence.

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1  
I added in some diagrams, please change them if they don't reflect what you meant! –  shujaa Dec 7 '11 at 4:26
    
@shujaa:Great, thanks so much. –  Tom Au Dec 7 '11 at 18:39
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Good question. White usually jumps into the corner in this joseki; if he jumps out he is ready to fight if necessary. When Black peeps he is giving you a wall that you can use to counterattack his pincer stone.

eidogo recommends W7, which denies Black a base on the side while being harder to press down.

$$Wcm1
$$ +-------------------+
$$ |...................|
$$ |...................|
$$ |...........2.1.....|
$$ |...,....7,..45.X...|
$$ |...........a.3.....|
$$ |...........8....6..|
$$ |.............9.....|
$$ |...................|
$$ |...................|
$$ |...,.....,.....,...|

Black jumping out to B8 leaves a weak point at a. Note that the corner can still be invaded and that White might get to block off the right side. How this develops will depend on the rest of the board, I think, but it doesn't seem bad for White.

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