Hakugen Incho Joseki

    Keywords: Joseki

The "Hakugen--Incho Joseki" is a rare continuation of the 3-4 point high approach outside contact, tsukehiki hanging connection.

([ext] Waltheri search reference)

According to Waltheri, it was first played professionally by Honinbo Hakugen as Black against Hayashi Incho in 1744. It was later played in 1820 and '28; in 1916, '26, and '34; and twice in 1938, as well as possibly later in an undated game of Hashimoto Utaro. Hashimoto seems to have been especially fond of the joseki, playing it several times.

[Diagram]
 

It begins like this, which is already an old fashioned setup.

[Diagram]
 

It continues with the push and cut, with W2 being the start of the joseki proper. Another joseki, played from 1799 to 1893, proceeds with W2 at a instead (after which Black protects at the W2 point himself).

[Diagram]
 

A close struggle ensues. In the older games, White would now turn at a. However, in the 20th c. (with the exception of Onoda--Hashimoto 1938) White would instead cut at b. In actual play, the two move orders reconverge later, but presumably a new defence against a had been found between 1828 and 1916, which it was thought that White should avoid.

[Diagram]
 

This is the newer move order. In the older order, W5 for B6 was exchanged first, and then W1 to B4. In the game Shuko--Yamabe 1938, Yamabe now played a for b.

[Diagram]
 

In all other games, though, White made this squeeze, making W5 sente. Here there is a branch: whether to peep at a or cut at b.

[Diagram]
 

After the peep, White can squeeze from the left.

[Diagram]
B6 at W1  

Whereas the cut allows White to squeeze from the top instead.


Hakugen Incho Joseki last edited by bugcat on March 22, 2024 - 21:54
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