(Referenced by 1043)

/// ( 986)
Matters change dramatically, when the kikashi of Michael Redmond in the bamboo joint ( / ) was played beforehand. To create the shared ko in the centre, we will take / off the board again.

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White starts the sequence in the centre.

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But now, Black's group is far below the Punishment Semeai Liberty Level. We will take / off the board, and shift to on the upper edge.

Black's group has eight effective liberties (3 * c, 2 * b, g, j, k), so it is safe from the Punishment Semeai. However, White's centre group has six effective liberties (w, 3 * c, g, j).

Please note that the ko-shape at j (it is Black's turn to capture) provides White with an approach-move liberty. Black must have lost a move beforehand, and we can assume that White will win unconditionally.

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White's group has more than five effective liberties, so Black is forced to give atari in the hanezeki. He cannot connect the hanezeki's tail, instead. Even the availability of a valid external ko-threat would not change the matter here.

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White wins the further semeai unconditionally.
This result here - compared to that without Michael Redmond's kikashi / ( 1040) - was the first indication for getting in doubt, whether our choice of playing the kikashi in the bamboo joint was technically correct, when followed by Joachim's Ko-Semeai.
Another uncertainty was related to White's solid move in the centre, played instead of here ( 1068).