:: Igo Hatsuyôron 120 (2015)

Joachim's Ko-Semeai - Putting the Cart

Before the Horse (2013 - 2015)

Overview & Summary (II)

This continues "Overview & Summary (I)" ( 942).

Now, we will explain some general issues, where both sides could go wrong, as well as our justification for choosing the very special moment for starting the ko.

There are various occasions, when Black might try to deviate from the course of our solution's sequence. These will be analysed later ( 976).

FLAG 0c: ( 961)
Black would win the game, if White ever lost a move unnecessarily.

FLAG 0d: ( 963)
White would win the semeai unconditionally, if Black ever lost a move unnecessarily.

FLAG 0e: ( 965)
White would lose ko-threats unnecessarily, if she started the ko even "later". Black needed as many ko-threats as White to win.

FLAG 0f: ( 967)
White would lengthen the ko-fight unnecessarily, if she started the ko "earlier". Black still needed one ko-threat more than White to win.

FLAG 0g: ( 971)
Black would win the game, if White filled-in her false eye in the hanezeki (with the aim of pre-empting Black's atari there as a ko-threat), instead of starting the ko.

FLAG 0h: ( 974)
Black would win the game, if White chose to play the gote-sente combination in the hanezeki, but did not finish it before Black connected the hanezeki's tail.

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