BQM 397

    Keywords: Question

Jeff: I played a game at the North American Oza Tournament this weekend (Jan 20, 2008) that started like this (as I remember):

Beginners' opening  

Clearly there are many mistakes. I was black and felt very grateful for W2. I have heard W8 is a trick play that black should respond to with B9, but I had no idea how to handle W10.

Herman Hiddema: W2-W4 is not so bad. Perhaps a bit slow, but that's all. with W6 however, white is being very one-sides. Playing a pincer here would have been consistent with the high (attacking) position of W4.

W8 is simply bad. Black can play tenuki and play the right side hoshi or a, and it will be a good exchange for black. It is very hard for white to find a good continuation in the lower left, because 3-3 is still open.

Punishing white's bad move.  

Herman Hiddema: Suppose black plays black+circle instead of responding locally to white+circle. White tries to salvage as much territory as possible by playing W1. Now with the sequence B2-B10, black is almost alive in the corner. A terrible result for white.

In-game continuation  

I tried this, thinking to keep him low and build outer influence. But I felt there surely must be a better way to handle these moves. Any suggestions? Thanks in advance!!!

In-game continuation, suggestion  

Herman Hiddema: This continuation is terrible for white, just play like this...

Now black gets the corner, keeps white very low on the bottom edge, keeps the marked stones weak and gets sente...

Elephant's eye  

Dieter: When confronted with W1, being a contact play, you obviously think of hane. You could also see the W1-white+circle configuration, which makes an elephant eye and play B2 at the heart of it. Next, a or b is bound to hurt either W1 or white+circle. Feel free to continue the discussion from here.

White's intention?  

Tapir: Imo, in a trick play there has to be some obvious answer, which turns out bad. W1 looks like a trick play, but I really don't see the trick. White may intend to play W1,B2,W3 to take a big corner, but B4 at b in Dieter's diagram hurts the corner again + the somewhat light three-space extension became a lot safer.


Jeff: Thanks! The nice thing about the advice you guys give is that W4 is gote. If white chooses to connect underneath, black can crawl on top of white (and indeed must crawl for at least the distance shown). I think I was getting to upset that white was crawling on the second line into my "territory". Instead, perhaps I should have thanked him?


Herman Hiddema: Whoa, wait a minute there. The advice given above is wrong. Do not play B1, that is exactly what white is after! Dieter: I disagree with that. See below.


Herman Hiddema: If black plays tenuki after W4 above, white can play like this. Now black has only one eye, and must run, while white has gotten the corner and can play a splitting attack against the black group and the marked stone black+circle.


Herman Hiddema: The best response for black here is probably to play tenuki (somewhere else)! White has played on the 2nd line in the opening, a move that is already weak in itself. Later, black can always play something like B1 and get part of the corner.

Jeff: Thanks for correcting that, Herman!

Tewari Analysis

Dieter disagreeing with Herman  

Dieter: You suggest that this result is what White is after and that Black has been tricked. I propose the following tewari


W1 strengthens the corner. B2-W3-B4 strengthen B's side position. Next W5-B6 is the exchange which we are discussin, which now comes oddly of course but doesn't alter the result significantly. It is difficult to say how Black has been tricked now. White simply has the privilege to claim the corner with W1.

In addition, the aji is not completely gone: due to Black's strong position, he can still attach at a and slide to b to threaten connection with somehting at the left, or live in the corner.

Herman Hiddema: Well, for tewari purposes, I would say the following:

  • W1 is a very normal move to protect the corner.
  • B2-W3 is a normal engame exchange if the bottom were black territory, which it is not, so this is slightly bad for black.
  • B4 is a terrible, slow move, black should play the one point jump up for influence, or play the one point jump (or keima) to the right for territory.
  • W5 and B6 are both nonsensical and might as well be left out.

So over the whole exchange, black has played two slow move on the second line, while white has played two reasonable moves that take the corner.

Dieter: Indeed, B4 is worse than I tried to convince myself it was. So it is a genuine trick sequence after all.

More diagrams


Herman Hiddema: Oh, by the way, B2 is not the right move either, here's how white could've punished that. There is still some aji left due to the peep at a, but getting W9 is very pleasant.

BQM 397 last edited by HermanHiddema on December 10, 2008 - 11:33
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