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| When hard problems become easy http://www.lifein19x19.com/viewtopic.php?f=15&t=17916 |
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| Author: | Knotwilg [ Mon Dec 07, 2020 3:48 am ] |
| Post subject: | When hard problems become easy |
I'd like to publish this go problem, which in the past would have been too hard for me to solve but now is surprisingly easy. I think I've become better at approaching L&D problems but it might be a kind of selective bias. Anyway, here's the problem Can I ask you: how many starting moves do you consider? How many moves do you have to read into the variation? Here's my solving procedure: |
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| Author: | Knotwilg [ Mon Dec 07, 2020 4:39 am ] |
| Post subject: | Re: When hard problems become easy |
The above was the "solving procedure", finding a solution. The remainder is "checking procedure", confirming the solution. |
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| Author: | Bill Spight [ Mon Dec 07, 2020 6:43 am ] |
| Post subject: | Re: When hard problems become easy |
a looks obvious, as a big point for both Black and White.  But let's do a little analysis. |
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. Without the exchange, White can play there and create an extra eye. But 3-4 looks problematic, because 3 forces Black to play what seems to be the vital point, dividing the eye space into two eyes.
and if he does, White lives.
and create an eye at the circled point. Without the exchange, Black can play A to falsify the other eye.
lives with two eyes, but is the key point to make a one point eye. It also looks like a key point for a second eye, as well. 
captures the 
stone, 
throws in at 
. 
prevents a second eye.