The Further Evolution of Amateurs' Knowledge
(2011 - 2014)
2013 - The Art of Capturing - Black's
Ko-Threats on the Left Side
(Referenced by 140; 155; 157; 243; 250; 418; 1018) : For the application with an "early" ko, we will calculate Black's ko-threats after White's moves from to respectively. Please note that White must be extremely careful with playing one of these protective moves on the left side, because she loses one move in the semeai sequence on the right, which may end futile. |
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///: : It may be a bit counter-intuitive, but we will see that the number of Black's ko-threats in not effected by this measure. The following table gives a summary of the results of our detailed sequences that are given thereafter. Move Page Seven Six Five Liberties With correct choice by White, Black cannot get more than two ko-threats only. You will recognise that is always best, and that , and , become worse with the massive reduction by two liberties (before White's kikashi there; five liberties remaining) in the top left corner. |
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///: Black may consider to pre-empt the cases , , and , above by inserting the first one, or two, exchanges of the Nakade Sequence ( / ). |
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Please note that we assume White's group to have seven liberties, i.e. the main line of Joachim's Ko-Semeai, where White inserts her own kikashi in the upper left corner ( / ). Quite surprisingly, additional Black stones at , and , will not affect the calculation of Black's ko-threats in the nakade here. Move 1st / 2nd / Again, with White's correct choice, Black cannot get more than two ko-threats. With one nakade Exchange played, White must choose , with two moves of the Nakade Exchange, her choice will become . Not very surprisingly, the cases , , , and , are reduced by one, respectively by two, ko-threats. Black simply lost some of his ko-threats therein with the partial Nakade Sequence. | |