Sub-page of Kokiri

他山の石 - Stones from another mountain


Here the move at a looks tempting in response to W1, but B2 is the pro move. This is because if black were to play first on top, he would play b, or somesuch, rather than a which allows W1, so W1, black+circle at a is an unhappy sequence for Black. Instead, B2, makes the corner stronger, which devalues the invasion at c - if white invades, Black jumps outward, ands indoing so can reduce the left corner somewhat, without worrying about the corner.

19x19 diagram  

Here W6 is the correct direction, because it stops the coordination of B6 and B3. As a result...

19x19 diagram  

...B3 approaches directly, forces white to choose which direction to play and then chooses B7 accordingly.

If W8at a, black can take the third corner. This feels almost a movce faster to black than the diagram above, becasue of the ineffective move White plays on the 2nd line, vs. the good 2nd line move in the top diag.
Other direction lessons:

  1. with 3-3, hoshi stones, seek to approach the 3-3 first, because it is more complicated than approaching a star stone, so will be trickier later in the game
19x19 diagram  

here B1 not a is right becasue the single star point stone is weaker than the enclosure.


Pretty much any situation on the top, B1 is right because the sequence given below for the ogeima is too cramped foe the kogeima

19x19 diagram  

This sequence is playable for black because the top right stones are quite srong. Left corner is big, white stones are not yet alive

Kokiri/notes last edited by kokiri on August 5, 2005 - 11:21
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