wineandgolover wrote:
daal wrote:
Hi Brady,
I have a question regarding the tenth episode. Assuming that "urgent before big" still applies, why is it is not considered urgent for black to defend that group on the left? What is it about this group that makes it acceptable to play a big move elsewhere and let it get chopped up?
daal, I am terribly incompetent at diagramming on this board, but I will try. In the meantime I would ask you to consider three questions.
1. Before black tenukies at D15, are the D5 stones cutting stones? In other words, is saving them really urgent?
2. How big are the three black tenukies at D15, K18, and O3? You don't have to be precise, just a rough guess.
3. If you assume black's two stones are dead after white E7, how much has white gained, versus what he'd have if black saved them?
Right, now I'll try to diagram.

Okay, my answers... (note, not a pro's answers.)
1. Before black tenukies at D15, are the D5 stones cutting stones? In other words, is saving them really urgent?
No, until white plays C7, these stones aren't cutting anything. So the first tenuki should be easy. 2. How big are the three black tenukies at D15, K18, and O3? You don't have to be precise, just a rough guess.
I'd estimate the value of the three tenukies at 15 points each (double komi), since they are reasonably efficient, and we are still in the opening. So a total of 45 points. (Note - This REALLY is just my opinion, and I'd love to know what others think.)
3. If you assume black's two stones are dead after white E7, how much has white gained, versus what he'd have if black saved them?
White has gained maybe 16 points in cash if you assume black D5 is dead. White also has really good invasion potential to gain more around a, so the value of his moves is certainly greater than 16. But is it anywhere near 45?
- Click Here To Show Diagram Code
[go]$$c 19x19 board
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$$ | . . . , . . . . . B . . . . . X . . . |
$$ | . . . B . . . . . . . . . . . . . . . |
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$$ | . . X . . . . . . . . . . . . . . . . |
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$$ | . . W . W . . . . . . . . . . . . . . |
$$ | S S S S . . . . . . . . . . . . . . . |
$$ | S S X X W . . . . . . . . . . . . . . |
$$ | S S O S O . . . . , . . . . . , O . . |
$$ | S S S O . . . . . . . . . B . . . . . |
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$$ ---------------------------------------[/go]
_________________
- Brady
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