Joachim's Ko-Semeai - Putting the Cart
Before the Horse (2013 - 2015)
2b - White's Gote-Sente-Combination
( 978) White did not play the gote move at , but at . Thereafter, the exchange of / is sente for White. The Punishment Semeai Liberty Level is "six" now, so White has captured the ko a bit "early" here (related to the Main Semeai). However, with Joachim's Ko-Semeai, it seems suitable for White to start the ko, when her centre group is reduced to five liberties. Black has one ko-threat in the hanezeki, at , but which is suicidal here, and so can be utilized "late" only. |
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: Please note that there are no valid ko-threats in the nakade, despite Black has not connected the hanezeki's tail yet. Black will need two moves in a row to decide the situation on the left side in his favour. But in the meantime, his top right group will get below the Punishment Semeai Liberty Level. |
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: With the double throw-in, we can conclude that the number of exceeding Black ko-threats (over White ones) to win the ko-fight is one. This is independent from what has happened in the upper part of the hanezeki, if White captured the ko at the moment, when her centre group is reduced to five liberties. |
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: Using the gote-sente-combination of , , and , in the hanezeki does not really make a difference. |
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