KEEP YOUR HANDS OFF
Monday, April 24th, 2006Sorry if I’m just rehashing an old point, but this is how Tsumego should be studied…
(White to play)
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There’s one point in this problem that sticks out more than any other… if you’ve done a lot of problems and especially tesuji, you probably know what that point is!
Now… here’s the wrong way to answer this problem:
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You choose W1 and your handy Tsumego program gives you B2 (or worse just says “correct” and moves on). Yay, you’ve gotten the correct vital point. Every problem has many vital points… finding the correct one (using this method) is usually a matter of luck (though some spots may look better than others - this trains you to figure out what the problem creator was thinking).
Once you’ve been given B2, you don’t have the original problem… you have a brand new problem with brand new vital points. Don’t think that this is a good thing! You’ve just made the problem easier by one level of reading, only through a bit of intuition and a lot of luck! Note that building Tsumego intuition is good, but this can be done without cheating yourself out of the rest of the problem - this also doesn’t apply to VERY simple “center of three” problems that involve only basic vital points - though these problems must also be understood.
The correct way to solve this problem is to KEEP YOUR HANDS OFF THE MOUSE/STYLUS!!! It’s pretty easy to see that black has 2-3 good answers and 2-3 more mediocre answers to White’s first vital point. What happens when W plays after B2 for each of those possibilities? What if W starts elsewhere - after all, B’s response looks pretty solid! How can W make two eyes here?
After I got this far (in my head, of course), I was trying to capture the center black stone for an eye… It certainly looks like the problem’s all about that! But the tesuji doesn’t quite work, so where are the possible eyes? There are really only three places eyes might be found… and one of them is already yours:
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Next… I start thinking about threats. If W plays to the left of two, what is threatened? White connecting above 1, of course… which means Black must play here (think tic-tac-toe… If there are Xs in two corners, with nothing between, where must O play?) That brings us here:
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Now it’s pretty easy… there’s still one more step, but there’s really only two threats on the board… capturing the center Black stone from either side. One of those makes a partial eye elsewhere, the other does not. Choose the superior move, and Black has the option of breaking the eye at B12 (note that the UL eye is still safe) in which case W captures to make eye no. 2. Or Black connects and W finishes the eye as shown below:
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