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.


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


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).


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 Black should avoid.


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.


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.


After the peep, White can squeeze from the left.

B6 at W1  

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

Hakugen Incho Joseki last edited by Dieter on October 25, 2021 - 15:25
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