6Dec/1131

## Sample insei tsumego

I mentioned tsumego drilling in the earlier blog post. In case you're interested in what kind of problems we do, here are two samples (from the harder end)! The problem diagrams are made with jGoBoard this time around. Both are black to play.

RobertTDecember 6th, 2011 - 09:48

How fast are you expected to solve these and how many do you get at a time?

TenDecember 6th, 2011 - 14:58

We didn’t get a time limit for these; an amateur teacher put these up and was like, these problems are really really hard. We then gathered round the table and spent quite a bit of time reading these out, easily ten minutes or so.

For more normal tsumego drills, there are cases in which we get around 10 problems to solve, slightly easier than these two, and have 30 minutes for them all. Then we see how many each of us gets right, and that seems to have a (to me as of yet unknown) effect on our dojo league rankings.

RobertTDecember 7th, 2011 - 05:56

Oh good then I solved them fast enough. I was getting worried that I was taking too long >.<

LodurrDecember 6th, 2011 - 10:29

1st one seems quite easy to me, main variation is: f2 f1 d2 d1 c1 e2 e4.

2nd is hard, I can’t solve it now =\

TenDecember 6th, 2011 - 14:45

To that: after f2 f1 d2, white will play c1 instead.

sigsDecember 9th, 2011 - 04:38

well, after c1 you’d hurry to take e4, which forces f3 and lets you make a killing shape in e2. If white plays e4 instead of c1, after bC1 white can’t play d1. So bF2 wF1 bD2 make e4/c1 miai? And if not wF1 then bF1 makes eyes impossible: even bF2 wD2 bF1 wC1 doesn’t work because bE2. Wouldn’t that justification be enough for claiming solution? And I’m definitely not dan

Do you need to prove your solutions or is just showing the spot enough?

TenDecember 11th, 2011 - 09:40

You need to prove them too, yes. After black e4 comes white h1, and it’s a seki at most.

ShyinDecember 6th, 2011 - 14:53

My 15 kyu attempt at the first one: C1 D1 E4 D2 F2 F3 F1. Probably wrong though, I think there’s a better way for white to respond somewhere.

TenDecember 6th, 2011 - 14:59

White has a better move available for d2!

ShyinDecember 6th, 2011 - 15:00

Actually, I think F1 instead of E4 might be better…

ShyinDecember 6th, 2011 - 15:01

Posted that before seeing the reply. But yeah, I knew something wasn’t right with my reading.

ShyinDecember 6th, 2011 - 15:37

How would white answer F2 instead of E4? I can’t find a good move after C1 D1 F2, even F1 doesn’t seem to work from my reading.

TenDecember 6th, 2011 - 15:41

Getting closer there! Next to figure out whether there’s something better for white d1.

JayDecember 6th, 2011 - 16:00

First stats with e4 (taking advantage of shortage of liberties), the second with f1?

KGODecember 6th, 2011 - 17:19

1st one: F2 F1 E2 D1/H1 D2 kills?

2nd one: F2 F1 G1 E1 D1 H1/G2 kills?

CamDecember 6th, 2011 - 18:20

I keep trying, but I don’t see any way white can live after f2, so I’m inclined to believe that is the right move.

ArcticDecember 6th, 2011 - 19:27

First one f2,f1,d1,h1,e2,d2,f1,f3,c1,e1,f1,e1,f1,f2 is a ko, but I can’t find anything better. There’s not much room for variation either, since other moves lead to certain life/death. Maybe I missed something though…

TenDecember 7th, 2011 - 01:08

You probably meant g1 instead of the second f1 in your sequence — that sequence should be correct as far as I know.

ShyinDecember 6th, 2011 - 20:44

Yeah, now that I look at it again, C1 D1 seems kind of useless, simply F2 prevents white from making two eyes, no?

AlphaDecember 7th, 2011 - 04:44

On problem #1, starting with F2, F1, E4 could you please point out the variation where W lives?

Every variation I try ends up with W dying so I must be missing something.

TenDecember 7th, 2011 - 05:55

That would continue with white h1. If black wants to keep on trying to kill, d2 next is a must, to which white responds with c1, creating a seki life.

ArcticDecember 7th, 2011 - 11:08

@Ten g1? You propably meant f1 as well.

Second one g2,b4,c4,a5,b6,b2,b3,a3,a6,h1,f2,f3,e1,f1 is another ko.

It would be interesting to see your games against the stronger C class inseis.

TenDecember 7th, 2011 - 13:35

Black can do better than in your variation; that’s not quite the solution yet.

I’ll try to include a game presentation in the next post.

KGODecember 7th, 2011 - 23:20

Another variation in the second problem: F2, D1, F1, E1, F3, E3, C4.

Am I missing something?

KGODecember 7th, 2011 - 23:31

Just realized that my solution to the first problem results in seki. D1 instead of E2 followed by H1, E2, G1, D2 is correct

TenDecember 7th, 2011 - 23:32

White will respond to black f2 with f3.

ArcticDecember 8th, 2011 - 04:39

Looks like unexpected h1,g1,f1 kills it. One continuation j1,f2,f3,d1,g2,e1,b4,b3,a5,b6,c4,b1

TenDecember 8th, 2011 - 04:44

White will answer h1 with d1, I reckon.

ArcticDecember 8th, 2011 - 04:51

Well, maybe not. h1,g1,h2,f3,f2,e1,d1,e1 then b4 becomes a ko…

If you can solve this level problems in games, then you shouldn’t have to worry about reading part…

miaoDecember 13th, 2011 - 12:46

f2 f1 e4 upper problem?

TenDecember 13th, 2011 - 14:23

That’s followed by white h1.