New Story Line 2022
KataGo's Bad-Shape Move in the Left Centre
VAR
Referenced by ( 2022MainLine)
: ( 2039) Seen historically, it was originally played two moves earlier, before Black's kikashi , in the lower left. We decided to present it in the current position, in order to simplify the presentation. | |
Liberties: Black's move loses two tempi in the Main Semeai. On the one hand, occupies an own liberty of Black's group in the upper right. On the other hand, Black has not occupied a liberty of White's group at the left side of the board. However, White's captured stone provides Black's group with an eye now, so his group has got an additional approach-move liberty at , due to the earlier played Hasami-Tsuke Sequence. Thus, ... Black has effectively "only" lost one Main Semeai Liberty. | |
Territory (in the Capture Variation): Compared to the superordinate variation, ...
In total, Black gained three points locally by capturing White's single stone. However, losing one Main Semeai Liberty implies the loss of one point of territory in the Capture Variation. Thus, ... Joachim's Tenuki has effectively gained two points for Black. | |
Let's return to the world of KataGo as of 2019 for the continuation ... | |
: Please note that Black's two stones at the left edge are now in danger of suffering from a shortage of liberties after , (preceeded by ff., as a matter of course) Please also note that the overall shape of Black's large group at the left side of the board is much weaker than it seems at first sight. | |
: : : | |
: She might even do without this move now, and play this kikashi of hers later in the game. : : ( C 2039c; D 2039d) Choosing the atekomi of (discovered by Sergei Danilov 4d - aka "dany"), instead, would provide White with a benefit of one point overall, but under territory scoring only. KataGo's initial 2019 version, however, used Trump-Taylor-Rules, which are based on area scoring. For further details of our analysis at the time, please refer to the history of our investigations ... Later, in 2021, we found another, less complicated, way for White to win the game by two points overall: The combination of and in the lower left corner. | |
: : This move also threatens to create two points of additional territory in the left centre with a move at . | |
White's last move created an additional approach-move liberty for her large group at the left. Thus, it did not lose a tempo in the Main Semeai, despite being played outside the Main Semeai Area. | |
: : : : | |
: This move from above has been found by Joachim Meinhard, and keeps Black's liberty at . Before Joachim's finding, we played this move at from below, separating White's stone directly from its allies in the centre of the board. : This move benefits White by one point in the Semeai Variation, compared to the immediate connection at (which Black must answer with ), and was found by Dany. | |
: | |
Capture Variation: Compared to the superordinate variation, ...
In total, Black gained one point. White + 2 => White + 1 | |
Semeai Variation: Compared to the superordinate variation, ...
In total, Black lost five points. Black + 4 => White + 1 | |