:: Igo Hatsuyôron 120 (2026)

The Non-Main-Semeai Solutions

During the Formation of the Hanezeki

Starting Point = White O5

White O5 as Move #8 (1 Jigo)

28b likes to start Black's Kikashi at the right edge extremely early (with or here), i.e. before Black has consolidated his encirclement of the Hanezeki.

This gives White the opportunity to break through with instead of answering with , as usual.

White O5 as Move #10 (2 Jigo)

28b likes to start Black's Kikashi at the right edge extremely early (with or here), i.e. before Black has consolidated his encirclement of the Hanezeki.

This gives White the opportunity to break through with instead of answering with , as usual.

Black had already played the Atari at the right edge.



The Jûrokubango has just been started.

Throughout the entire self-play training period, Black's Initial Self-Play Success Ratio (the blue line in the diagram) fluctuates around the 50% range.

It is therefore highly likely that we are dealing with a valid solution here.



White O5 as Move #10 (#2; 1 Jigo)

28b likes to start Black's Kikashi at the right edge extremely early (with or here), i.e. before Black has consolidated his encirclement of the Hanezeki.

This gives White the opportunity to break through with instead of answering with , as usual.

White O5 as Move #12 (1 Jigo)

28b likes to start Black's Kikashi at the right edge extremely early (with or here), i.e. before Black has consolidated his encirclement of the Hanezeki.

This gives White the opportunity to break through with instead of answering with , as usual.

Here, Black had already inserted one exchange of the "Two-Throw-In-Sequence" to the left.



The Jûrokubango has come to an end.

Over the course of the Jûrokubango (bold section), Black's Initial Self-Play Success Ratio (the blue line in the diagram) stabilised just over 50%.

We are looking at a viable solution here !

28b's surplus of won games in the Jûrokubango (the red line in the diagram) has reached the range of 0 to -5 (showing an upward trend).

28b has therefore mastered this variation just as well as 40b.



Please click the board for SGF-download ...
(28b = Black)

Please click the board for SGF-download ...
(28b = White)

The comments indicate the number of games in which the respective variation was selected.
E.g. "A=19 // B=264" == Variation "A" was played in 19 games, variation "B" in 264 games.
(The labelling is designed for SGF-editors that label next moves with capitals "A", "B", "C", ...)

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