I found Park's play throughout the game with that lower side group really interesting. When black played the key shape point of p5 the obvious thing for white to do is connect at o5, or maybe m6 (though that does have some liberty problems with o5 and o2 then n4). But giving black p5 in sente is a bit generous so instead Park played some sente exchanges to make some eyeshape on the side, and then tenukid to a big point, the plan being cutting at o5 and starting the m1 ko were miai.
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[go]$$c81 Taking sente
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X X X X . . . . . . . X . . . . . |
$$ | . . O O O . . . . , . . . . X X X . . |
$$ | . . . . . . O . . . . . . X . . X O . |
$$ | . . X O . . . . . . . . . . X X O . . |
$$ | . . . . . . . . . . . . . . 8 O O . . |
$$ | . . O . . . . . . . . . . . . . X . . |
$$ | . . . O . . . . X . . . . . . . . . . |
$$ | . . O X . . . . . , . . . . O , O . . |
$$ | . . . O X . . . . . . . . . . . . . . |
$$ | . . . O X . . . . . . . . . . . X . . |
$$ | . O O X O X . . . . . . . . . . . . . |
$$ | . O X X O O O O O O . . . O . . . . . |
$$ | . X . X X X X X X . . . . . 1 . . . . |
$$ | . X X O . . . . . , X . . O X , X . . |
$$ | . O O . O O . . . . X O . O X . . . . |
$$ | . . . O O X X . . 3 2 . 6 . 4 5 . . . |
$$ | . . . . . . . . . . 7 . . . . . . . . |
$$ ---------------------------------------[/go]
Sometime later black swallowed the group, but Park showed nice technique in getting in the r2 kikashi and making black connect at k1, leaving some aji still in his group.
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[go]$$c127 Sacrificed, but not a clean kill for black
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . X . . . . X O . . . . . . . . . . . |
$$ | . O X X X X X O . . . . . X . . . . . |
$$ | O . O O O O X O . , . . . . X X X . . |
$$ | . O . . . X O . . . . . . X . . X O . |
$$ | . . X O . O . O O . . . . . X X O . . |
$$ | . . . . . . X X X X . X . . O O O . . |
$$ | . . O . . . . . X O . . . . . . X . . |
$$ | . . . O . X . . X O . . . . . . . . . |
$$ | . . O X . . . O O , . . . . O , O . . |
$$ | . . O O X . X X . O . . . . . . . . . |
$$ | . . X O X . . . . . . . . . . . X . . |
$$ | . O O X O X . . . . . . . . . . . . . |
$$ | . O X X O O O O O O . O 6 O . . . . . |
$$ | . X . X X X X X X . . X 4 X X . . . . |
$$ | . X X O . . . . . , X 7 5 O X , X . . |
$$ | . O O . O O . . . . X O . O X . . . . |
$$ | . . . O O X X . . X O . O . O X 2 . . |
$$ | . . . . . . . . . 1 X O . . . 3 . . . |
$$ ---------------------------------------[/go]
When I was replaying this game n12 confused me when white then tenukid black's n13. "What was the point of that?" I thought. But these moves were preparation for the ko and it all became clear 44 moves later: by getting in these kikashi white made black o9 a less effective ko threat as n12 slowed down black's attempt to cut white, a nice example of the "covering fire" effect of kikashi. Note also s16 is a yose move which generates a few big threats with the r17 cut.
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[go]$$Wc150 Preparing the ko
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . X . . . . X O . . . . . . . . . . . |
$$ | . O X X X X X O . . . . . X . . . 8 . |
$$ | O . O O O O X O . , . . . . X X X 7 . |
$$ | . O . . . X O . . . . . . X . . X O . |
$$ | . . X O . O . O O . . . . . X X O . . |
$$ | . . . . . . X X X X . X 6 . O O O . . |
$$ | . . O . . . . . X O . 4 1 . . . X . . |
$$ | . . . O . X . . X O . 5 . . . . . . . |
$$ | . . O X . . . O O , . . . . O , O . . |
$$ | . . O O X . X X . O . . . . . . . . . |
$$ | . . X O X . . . . . . . . 3 2 X X O . |
$$ | . O O X O X . . . . . . . . O O X O . |
$$ | . O X X O O O O O O . O O O . X O . O |
$$ | . X . X X X X X X . . X O X X X O O X |
$$ | . X X O . . . . . , X X X O X , X X X |
$$ | . O O . O O . . . . X O 9 O X . . . . |
$$ | . . . O O X X . . X O . O . O X O . . |
$$ | . . . . . . . . . X X O . . . X . . . |
$$ ---------------------------------------[/go]
So when white ignores black's o9 threat, the n12 kikashi come in handy as white can connect his groups. This does make me wonder though if black's block at n13 was soft, maybe he should cut as a probe to avoid being kikashid?
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[go]$$c193 White connects thanks to n12 kikashis
$$ ---------------------------------------
$$ | . X . . . O O . . . . . . . . . . . . |
$$ | O X . . . . X O . . . . . . . . X X . |
$$ | . O X X X X X O . . . . . X . . O X O |
$$ | O . O O O O X O . , . . . . X X X O . |
$$ | . O . . O . O . . . . . . X . . X O . |
$$ | . . X O . O X O O . . . . . X X O . . |
$$ | . . . . . O X X X X . X X . O O O . . |
$$ | . . O . . . X . X O . X O 3 . . X . . |
$$ | . . . O . X X O X O . O 1 . . . . . . |
$$ | . . O X . . . O O , . . 2 4 O , O . . |
$$ | . . O O X . X X . O . . . X . . . . . |
$$ | . . X O X . . . . . . . . O X X X O . |
$$ | . O O X O X . . . . . . . . O O X O . |
$$ | . O X X O O O O O O . O O O . X . X O |
$$ | . X . X X X X X X . . X O X X X . . X |
$$ | . X X O X . . . . X X X X O X , X X X |
$$ | . O O . O O . . O O X O O O X . . . . |
$$ | . O . O O X X . O X . X O . O X O . . |
$$ | . . . . . . . . . X X . X . . X . . . |
$$ ---------------------------------------[/go]
If white hadn't made the n12 exchanges, then black's o9 threat would be more powerful as white can't connect his groups so is in some considerable danger.
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[go]$$c White cut, entire centre in danger
$$ ---------------------------------------
$$ | . X . . . O O . . . . . . . . . . . . |
$$ | O X . . . . X O . . . . . . . . X X . |
$$ | . O X X X X X O . . . . . X . . O X O |
$$ | O . O O O O X O . , . . . . X X X O . |
$$ | . O . . O . O . . . . . . X . . X O . |
$$ | . . X O . O X O O . . . . . X X O . . |
$$ | . . . . . O X X X X . X . . O O O . . |
$$ | . . O . . . X . X O . 5 4 . . . X . . |
$$ | . . . O . X X O X O . . 1 . . . . . . |
$$ | . . O X . . . O O , . . 2 3 O , O . . |
$$ | . . O O X . X X . O . . . X . . . . . |
$$ | . . X O X . . . . . . . . O X X X O . |
$$ | . O O X O X . . . . . . . . O O X O . |
$$ | . O X X O O O O O O . O O O . X . X O |
$$ | . X . X X X X X X . . X O X X X . . X |
$$ | . X X O X . . . . X X X X O X , X X X |
$$ | . O O . O O . . O O X O O O X . . . . |
$$ | . O . O O X X . O X . X O . O X O . . |
$$ | . . . . . . . . . X X . X . . X . . . |
$$ ---------------------------------------[/go]
A beautiful sacrifice from Park, getting 110% value out of his dead stones. (He even has g3 yose left for desserts!).