wineandgolover wrote: Can I assume that "wariuchi" is C in the OP?
Do we know why Go Seigen thought it bad? I'd guess the lack of development opportunities on the bottom, and the open skirt on the left.
John Fairbairn wrote: the most popular choice for White 6 is the wariuchi (splitting move) at A
Go Seigen and AlphaGo both dislike splitting the right side. AlphaGo likes the high shimari at C. I'm guessing Go might like it too if he doesn't like splitting (I don't know if he liked the small high shimari particularly (but possibly yes as it's not vulnerable to the shoulder hit he liked to play against the small low one), but he certainly played the large low one quite a lot, as does AlphaGo/Master).
P.S. Actually something related I remember reading is that according to some opening theory judgements of pros, the exchange of 1 for 2 here is slightly good for black (basically it's corner better than side, though maybe Master or Go Seigen would disapprove of the small shimari):
- Click Here To Show Diagram Code
[go]$$B
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$$ | . . . . . . . . . . . . . . . . 1 . . |
$$ | . . . O . . . . . , . . . . . , . . . |
$$ | . . . . . b . . . 2 a . . . . X . . . |
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$$ +---------------------------------------+[/go]
It is played in pro games though (221 games in waltheri). Interestingly white's further extension at a, which is presumably made partly in respect of this thinking (and makes black's checking extension less good, but on the flip side is further from the white 4-4) is slightly more common (267), but has a lower winning percentage (45.3% vs 50.2%). The more modern style of the tight knight's move at b has 96 games and 53.1% win. So given this theory, in the original position I can see some logic for preferring white making his own shimari instead of splitting even if that does allow black the good move in the middle which is a good extension from both the shimari and the top right 4-4.
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In his ten volume set, Go Seigen: 21st Century Go he sometimes likes the wariuchi as White, sometimes not. There is even an example where he contradicts himself on that point in two different places. 