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 Post subject: On "Kageyama's Fundamentals, dia. Nets-10" #1 Posted: Sat May 16, 2020 3:09 am
 Tengen

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Citation reference:

https://lifein19x19.com/viewtopic.php?p=256577#p256577

Ferran wrote:
`[go]\$\$c Now... on dia 10, page 31\$\$ ------------------\$\$ . . . . . . . . |\$\$ . . . . . . . . |\$\$ . . . O . . . . |\$\$ . O . O X X . . |\$\$ . . O X O . c . |\$\$ . . . X O . d . |\$\$ . . . X a b . . |\$\$ . . . . . . . . |[/go]`

Kageyama [...] recommends 'a'. [...] However, Black at 'b' settles the matter [...]
is that difference due only to sente (and maybe the lack of defects facing South) or am I missing a lot more?

Kageyama meant to explain what is explained explicitly in Joseki 1 Fundamentals, p.245:

"12.4.2 How to Play Nets

A net must take a firm grip on the captured string. It should leave the least aji. This means that the opponent has the fewest number of forcing moves related to the captured string.

Generally, sacrificing additional stones is good only if they allow effective additional forcing moves and not just a considerable increment of opposing thickness. If several nets leave the same number of forcing moves of about equivalent aji, then the most efficient of these net stones is played."

 This post by RobertJasiek was liked by: Marcel Grünauer
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