This lesson:
wants the answer 3. The corner is worth two points to white and zero to black, which would give it a value of two, so where does the extra point of value come from, or is the answer wrong?
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I think the answer 3 reflects the additional point of territory towards the center that white doesn’t have to fill in connecting the group if it makes an eye in the corner.
This is quite a bit harder to see than the answers to the preceding questions so I could see why this would present another point of confusion.
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This is endgame practice 3 in that series, and there is another one in the same section with the exact same concept later
I’d say comparing the final settled shape/move is a pretty important concept to practice
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Thanks guys. I am now enlightened.
So, generally speaking, if securing a group in one place means you don’t have to defend that group elsewhere, that may be worth extra points.
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Yes. This happens particularly often on the 1st line.
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If White doesn’t play at A and Black does, White can’t block. A Ko can be started or not. Either way, the corner gets filled and 3 points get lost. If White plays at A, White steals a point from Black and gains two (=3). Is this also a way to look at this question?
How does white playing at A steal a point from black? Black doesn’t have any way to make points.
No, I think garlicsoup was right.
If white plays A, he gets two points in the corner. He also prevents black from attacking his group.
If black plays A, he gets no points but threatens (eventual) atari on white’s group. White would have to respond by connecting the other end of his group. That would fill in what would otherwise have been a point of territory for White.
Thus A is worth nothing to black but three to white: two in the corner and one at the other end that he doesn’t have to fill. The difference is three so that’s the value of A.
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I see it. I completely overlooked the atari on the group. Thanks!