Problem diagram.
Black's response to the marked stone?

Source:
Match the Joseki to the Fuseki , Sakiyama Toshio 9p
Go World #4, Nov-Dec 1977, pp. 39-44

Solution follows    (or click here to download SGF)

Wrong.
Following the joseki with Black 1 goes against the logic of go. Through 6, White secures a base at the top, which makes the position easy for him. And if Black makes correct shape at 7, White will probably slip under Black at 8. Black's joseki in the upper right doesn't have good potential. The reason is that White's marked stone on the right is poised to invade the right side. In addition, White's marked stone in the center is poised to destroy any Black attempt at a center moyo, e.g., after Black A.

Much better.
Black 1 may not be the best move, but is good enough for a 4 stone game. White can invade the corner at 2. Black has given White territory on the right, but makes effective use of the marked stones on the left for a moyo framework.

White variation.
Of course, White can head off a Black center moyo by playing at 2. But Black can simply defend at 3 for a position far superior to that in the 1st diagram above.

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