|Table of diagrams
BQM299 Original Diagram
BQM299 Original Diagram (continuation 1)
BQM299 Original Diagram (continuation 2)
unkx80: To answer your first two questions, and seems okay to me. I think is not a good move, so my answer to your third question is that and suffices to separate the Black stones, which I think is a pretty good result for White.
Velobici: It is not clear to me that the White pincer of is correct direction of play. The Kobayashi Opening article in Go World 87, shows White responding to the Black approach of with a play at b. A Dictionary of Modern Fuseki The Korean Style, Pattern 45 The Kobayashi Opening shows two choices for , to play at the location of or at a. Charles Matthews Fuseki On Your Side shows three White responses to the Black approach at , these are plays at b, at the location of , and at a. These are discussed in several articles (parts) in the series (e.g. 15, 18, 20 and 22).
The Korean Style: Korean Joseki Innovations, a recent series of articles in Go World, does discusses the position with the lower right Black stone at c, then the series takes the White response at the point of to the Black approach of as a given. A Dictionary of Modern Fuseki The Korean Style, Pattern 39 The One-Space Pincer discusses when the lower right Black stone is at c. The english translation of Rin Kaiho's Dictionary of Basic Fuseki does not contain the Black approach of as a theme diagram, rather Black plays at a (page 220). Fuseki on Your Side part 3 discusses (briefly) when the Black stone in the lower right is on the star point.
A game database search is in order.
Bill: When I made my original comment, I only said that I did not like . I was aware that it might appear in professional play. After dnerra's comment I checked on GoBase, and indeed it does -- at least once by Takemiya! ;-)
Lynx: Thanks for the input! I'm quite contraian, hence the pincer, but I guess being more polite is the better, more played route ^^.