Make both ends strong

    Keywords: Strategy

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Charles Matthews There is some common advice on frameworks like this:

Make both ends strong  

Here B1 is better than a play like Black a. After B1 both black groups have a base so that Black can fight strongly when White invades. Black at a prevents White from making a really easy invasion: but it seems to do less that is definite and Black doesn't yet have much territory.

John Fairbairn: Don't you think the proverb play away from thickness covers it? And if we apply principles as opposed to personal style, wouldn't B1 be better on the fourth line? If so, "balance" is an applicable principle. I can see also a case for the principle of inviting the opponent to invade your framework (a would not be a framework).

Charles: More about maintaining some other sort of balance than about any kind of thickness, really.

BobMcGuigan: B1 conforms to the principle of strengthening the weaker stone when extending. A play at a instead would be over-concentrated relative to the corner. It would also allow a good white invasion below the star point on the upper side. After the invading stone becomes stronger there could be aji against the black corner as well.

Bill: Black is already overconcentrated in the top left corner. At first I thought there was a small low enclosure there, but it is a strange one space extension from the 3-3. Was there an original typo in the diagram?

Charles: No, the 3353 enclosure was intentional. Just to make the point about frameworks with two 'strong ends' stand out a little more.

White can develop  

Charles: The other side of the story would be this. After W1, White can make something of a base: this is a relatively easy invasion. If black+circle had been further to the left then W1 wouldn't work so well.

But the point would be that Black's upper side group looks quite settled at present: Black should have time to play a flanking extension at a point like a.

I'd also argue that this sequence available to White is a good reason not to play black+circle at b, instead.


Bill: After B1 the pincer is better, I think. There are several variations, OC, but in the ones I looked at, I think that B1 works out fine.

Charles: Yes, that does look strong. So in this case W2 might be close to an overplay.

Charles: Here's a similar example, related to what was said at 3-3 point with 4-4 point.

A rarity  

This is an uncommon side pattern. The reason would be that the enclosure with BC would normally take a lower priority amongst big points in the opening. It was played in relation with black strength in the lower right.

On one occasion (Sugiuchi Kazuko-Kataoka Satoshi(B) 1988-07-05, colours reversed) this did occur.

Black plays for a strong group  

Black played simply to settle with the standard joseki.

This therefore does give two strong ends, and a five-space extension between them, for an efficient formation.

Make both ends strong last edited by tapir on June 26, 2008 - 12:49
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