this would seem to suffice
The reason I feel in the original pattern can't be good is because this move is often used by white as a ladder breaker or ko threat. So the position in the first diagram is the same as if black ignored this threat. Am I missing something? -Calvin
Bill: provokes . Now is weak and the White stones are strong. Furthermore, Black is cut in two. White can be happy with this exchange.
It is natural to attack Black's weak stone, but one danger is to end up capturing it on a small scale. If White gets too little by capturing it, Black will be able to regard it as a sacrifice. The exchange, - , is bad. White does not have to capture to gain from it.
That having been said, the gain is not all that big, nor is the subsequent play all that easy. I posted a suggestion that I am now not so happy with. <sigh>
Bill: Sometimes it is easier to say what you don't like than what you do. Let me illustrate the danger I was talking about.
is a natural, strong response. further weakens , but it looks inefficient. However, if and were not there, then it looks OK, and the exchange of with favors White.
Bill: The danger comes with a play like , which threatens . If White prevents that with , White has captured on too small a scale, and ends up overconcentrated.
Anonymous: How about white using her extra strength for some aggressive tactics in the corner?
Bill: Complications aside, strengthening the opponent while strengthening already strong stones is not so appealing to me.
Bill: Black can set a trap with - .
Bill: gives Black an empty triangle. If , puts pressure on Black's corner. (If Black protects on the top instead of , White continues a severe attack against Black's heavy stones on the left.) This looks good for White, but still tricky because of the weakness of the stones.
Bill: - set no trap, but put up stiff resistance. is a shape play, giving Black an empty triangle and preventing , which would leave White peeping at a bamboo joint. But now Black is pretty well connected, and White is shut into the corner.
Bill: White can push through, but then things get complicated. Here is one possible continuation. Black might play at a, but I don't think that works.
Bill: Next White may push out with and then Black will make something on the top side.
This is not so easy to assess, but may be good for White. Either side may have better play.
Bill: This is my earlier suggestion. The exchange, - , is not attractive, since is on the 4th line, and Black's corner is strengthened, but it does keep White from being shut into the corner. Now White pincers with .
Bill: So now I'm back to one of my early thoughts. keeps White from being shut into the corner and makes miai of the top and left sides, without strengthening Black or leaving weaknesses behind.
Compare that with this joseki.