Variations of Our Solution (Ib)
KataGo's 2021 Solution
VAR (.3) (.3)
: ( 58bb) | |
: | |
: However, this move will increase the susceptibility to errors in the following course of the game unnecessarily (and is a genuine mistake, if played too early; 58dr), and so can be considered to be a technical mistake in the timing of moves. White should simply refrain to play this move so early in the game. (Referenced by 58ar; 58dc; 58dr) : ( 108 58bz) Here, however, the exchange for is the game-deciding mistake - in conjunction with the also unnecessary wedge in the left centre before. After White's earlier atari at Black's nakade, Black can no longer benefit overall from answering White's crosscut of in the upper left corner with the outside atari of , but has to retreat with playing the atari from the inside. Please note that White has not yet connected her two stones in the lower left here. White must simply refrain from playing this move, if she had already played the wedge in the left centre before. : : : : However, White cannot gain any local advantage by this exchange. If White let this exchange unplayed, her wedge at usually would be sente, forcing Black to connect at , so avoiding the effect describes above. Please note that - in the subvariations below - we usually refrained from letting Black benefit by White's mistake. | |
: : : : (A 58cj) Please note that this choice (a correct continuation below provided) will benefit White by four points in the Semeai Variation, while not affecting the overall result of the game. | |
: Here, however, White cannot gain any local advantage by this exchange. And seen globally, White provides Black with an additional Main Semeai Liberty unnecessarily. : : | |
: : | |
: (149 58ck) He would be one point worse overall, if he mistakenly captured White's two stones in the lower left, instead. : ( 149 58cm) White would benefit by one point in the Semeai Varation, if she connected her two stones in atari, instead. : ( 149 58cn) He would gain one point in the Semeai Variation, compared to the correct line of play below, if he captured White's two stones in the lower left, instead. : ( 149 58cq) This move was my first candidate for a potential mistake in this subvariation, as White usually benefits in the Capture Variation by connecting her two stones in the lower left. Connecting her two stones in the lower left, instead, would benefit White by one point in the Semeai Variation, while not affecting the overall result of the game. : : | |
Black plays 3/3 reductions. | |
Capture Variation: Compared to the superordinate variation, ...
In total, gains and losses compensate for each other. White + 1 => White + 1 | |
Semeai Variation: Compared to the superordinate variation, ...
In total, White gained seven points. Black + 7 => Jigo | |