Some people may have noticed I am trying to translate an old Go book. Every so often I find the copy I am working from has some mistakes - nothing new there! I would like to ask for help solving one of the harder ones. As you can see, we have 3 figures in a row which are essentially the same. I have decided that the first figure is probably correct, but the next 2 are wrong.
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The essential translation is then:
Starting Figure 4.2.1 (actual game)
Black 15: should be played at d , see Figure 4.2.2
Broken Figure 4.2.2 (variation)
After black 1, white connects with 2
then black 3, white 4, and black 5 continues the attack
(if white "a", black "b")
After black 1 white could play "C" - see Figure 4.2.3
Broken Figure 4.2.3 (variation)
Following the exchange of 1 and 2 here, black could continue with 3, strengthening his moyo above.
Now white must play "a" or "b", then black "c" (and eventually "d")
at d as 
, and should have diagrams for a couple of follow-ups by white. The last diagram seems, based on the text, to possibly begin a couple moves into a variation of the second diagram. I'm not sure what moyo they are speaking of, however. Is there a full-board position or an explanation of how the starting position occurred earlier? It seems vaguely like a 3-4 3 space low pincer joseki, but I don't recognize it.