Here is a charming tsumego from the ancient Chinese book, Shiqing Lu.
Enjoy!
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| Charming ancient problem http://www.lifein19x19.com/viewtopic.php?f=15&t=3700 |
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| Author: | Bill Spight [ Thu Apr 21, 2011 10:45 am ] |
| Post subject: | Charming ancient problem |
Here is a charming tsumego from the ancient Chinese book, Shiqing Lu.
Enjoy!
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| Author: | Shaddy [ Thu Apr 21, 2011 11:25 am ] |
| Post subject: | Re: Charming ancient problem |
Black has no resistance left, I think. |
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| Author: | Mnemonic [ Thu Apr 21, 2011 11:59 am ] |
| Post subject: | Re: Charming ancient problem |
It doesn't looks so bad first but if you just play by instinct:
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| Author: | Horibe [ Thu Apr 21, 2011 12:02 pm ] |
| Post subject: | Re: Charming ancient problem |
Shaddy wrote:
Black has no resistance left, I think. This gives me a headache - but if I were black I would "resist" with the throw in on the left...not sure I see how white lives this way - you cannot make black connect... |
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| Author: | Horibe [ Thu Apr 21, 2011 12:49 pm ] |
| Post subject: | Re: Charming ancient problem |
After lengthy staring...a tip of the hat to Shaddy... |
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| Author: | tchan001 [ Thu Apr 21, 2011 12:59 pm ] |
| Post subject: | Re: Charming ancient problem |
haha, shaddy, we studied this shiqinglu problem last august in one of our tsumego sessions in the L19 room. |
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| Author: | Shaddy [ Thu Apr 21, 2011 5:36 pm ] |
| Post subject: | Re: Charming ancient problem |
did we? wow, i had completely forgotten -but it seems i remembered the main idea, hehe |
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| Author: | ez4u [ Thu Apr 21, 2011 7:10 pm ] |
| Post subject: | Re: Charming ancient problem |
Mnemonic wrote: It doesn't looks so bad first but if you just play by instinct:
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| Author: | Bill Spight [ Fri Apr 22, 2011 7:22 am ] |
| Post subject: | Re: Charming ancient problem |
Congratulations to the solvers. ez4u's answer is the most detailed and thorough. I have a perspective that is a bit different, and adds something, I think.
I have always thought of plays like  as threatening to make a eye. But there is another way to look at it, which is helpful here. make a half eye at "a".  takes it away. also makes a potential half eye when the  stones are captured. But White needs two eyes to live. Where are the other eye and a half coming from?Obviously, they have to come from capturing or killing the three other stones inside White's eye space. Just killing them is not enough, as that yields only one eye. But capturing three stones yields 1 1/2 eyes.
White must be careful. If Black plays at 3, White can capture four stones, but the resulting four point square eye would only be a single eye, not an eye and a half.  prevents Black from taking away a potential half eye.
White must still be careful, as the two eyes are only potential. If White plays  before  or  , then he will make only 1 1/2 actual eyes when capturing one group of stones or the other. White must capture both at once to make two eyes.
1 1/2 + 1/2 = 2 eyes. Here is a variation for Black.
 connects to prevent two separate eye spaces for White.
However, the resulting zigzag four eye shape is alive. Black has no nakade to kill. ------ Endgame considerations are not really part of tsumego, but still of some interest, I think.
After White is alive. Now the local temperature has dropped, and both players can play elsewhere.
 forces  , and then  captures five White stones.
saves the five stones.
Ignoring the plays on the left for convenience, Black has a one point sente on the right.
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and your group dies
seems to be key so let’s play it. But as far as I can tell \n