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This is our "standard" reply for White after Black's eye-stealing move of in the upper centre. White stops Black from establishing another ko-shape in this area ( 1077).
Now, it is mandatory for to choose the "aggressive" cut of . The more restricted push of from the left, instead, that is easier for White to handle, is a mistake.

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Black cuts inside White's shape. is present already, destroying the miai that is explained in the theory chapter as "2014 - A Totally Unexpected Miai (I)" ( 874).

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Connecting at , instead, will not help either. Black will give atari from below, at .

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White must be on her guard here, and capture Black's two stones immediately.

She should avoid falling into the trap of simply answering with the sagari of .

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Our preparatory sequence continues until White's centre group has five effective liberties (3 * w, 2 * c) left.

Black group has seven liberties (2 * c, 3 * b, k), so he needed the "usual" single (external) ko-threat to win the semeai.

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This internal ko-threat on the upper edge is the match-winner for Black.

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Black connects the hanezeki's tail now.

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White prepares the ground for an atari-ko-threat in the upper left corner.

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White's centre group has still four liberties, so neither the atari of on the upper edge, nor the suicidal atari of in the hanezeki, are valid ko-threats for Black.

Ko:

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But Black simply occupies further liberties.

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Black captures the ko for the last time. White cannot stop Black from giving atari at , so winning the game.

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If White - in the preparatory sequence - thoughtlessly played this sagari, to stop Black from connecting along the upper edge, she would be taken by surprise. This move is even worse for her than capturing Black's two stone's immediately, with a move at .

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White's centre group still has five effective liberties (2 * w, 3 * c), but Black's group has eight liberties (3 * c, 4 * b, k) now, which is a disaster for White. Not to mention the additional ko-threat that is available for Black on the upper edge.

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If Black - in the preparatory sequence again - plays his "usual" hane on the upper edge, ...

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... White will solidify her shape with the move of here.

By thoughtlessly playing the sagari of , Black again will gain a decisive liberty / move (after , and the atari of ) as already explained above.

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Only now, White has five liberties (2 * w, 3 * c) against seven liberties (3 * c, 3 * b, k) for Black's group in the upper right.

Black lacks ko-threats outside the hanezeki. Therefore, due to Black's initial mistake with his hane at 4, White will win the ko-fight.

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After White's initial move at , Black mistakenly plays from the left. The preparatory sequence results in a change in the order of moves with our "standard" procedure for Joachim's Ko-Semeai.

White has five liberties (2 * w, 3 * c) against seven liberties (3 * c, 3 * b, k) for Black.

Black needed an external ko-threat (more than White) to win the game, but which he lacks now.