Variations of Our Solution (IIIb)
Dany's Ko: Joachim's No-Ko-Threats
VAR (.1)
: ( 648mk) We will explain below that neither , nor , in the upper right include a sufficient threat, which would enforce an immediate local reply by Black. Please remember that we played of , in the left centre too early in 2019. Therefore, this exchange was still available as a ko threat for White. We will utilise the exchange of , at the lower edge as a replacement in the sequences below (if necessary). | |
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: (B 648qb) KataGo (2021i) favours the connection in the right centre with just now, which implies that KataGo (2021i) wants to play this move as early as possible. : (161 648qc) However, KataGo (2020) found a way to generate an additional ko threat - the fourth one - in the upper left corner, which will benefit White decisively. : (A 648qp) Playing this atari from the outside, at instead, would be a grave mistake, resulting in a loss of one point overall. : ( B 648qr) KataGo (2021i), however, ends the ko fight just now, keeping Black's final two territory-destroying moves in the upper right - which could be utilised as ko threats - in reserve. ; : : ( B 648qs) However, this would have been the last moment to terminate the ko fight by connecting at in the right centre, achieving a win in the Semeai Variation. : (C 648qt ; B 648qv ; F 648qx) Joachim found that Black could ignore any of White's moves , or , in the upper right. In the very beginning, White could have inserted her kikashi of , in the lower left corner. |
: ( 184 648qz) He would gain two points in the Capture Variation, if he connected in the right centre, instead, but still be unable to affect the result of the Semeai Variation. : : (184 648ra) Enlarging his territory in the right centre, instead, will not affect the final scores of the game any longer. | |
: (187 648rb) Black is unable to connect at (this would cost him one liberty too many); therefore he is bound to realise his aim at the upper edge. If he did not succeed, White would benefit by one point in the Capture Variation. : : | |
Capture Variation: Compared to the superordinate variation, there are no changes. White + 2 => White + 2 | |
Semeai Variation: Compared to the superordinate variation, there are no changes. White + 2 => White + 2 | |