Joachim's Ko-Semeai - Putting the Cart
Before the Horse (2013 - 2015)
(Referenced by During our further analytic work on Joachim's Ko-Semeai, we got the feedback that some readers found the style of the theory chapter "About Ko in a Semeai Between Two One-Eyed Groups" ( This led us to the idea to start an additional analysis with a "late", and "nearly finished", real board position, at a characteristic, and decisive, moment of the sequences. Our main point of view is that White wants to establish a "late" ko successfully. We use a kind of "reverse engineering" to build the various cases that are important for analysis, i.e. we change a small part of the "nearly finished" board position only. We are sure that this will help us pre-empting most of the technical mistakes that happened in our previously used long move sequences. In the meantime, we have adjusted the sequences in the variations' chapters accordingly. | |
A Decisive "Late" Moment | ![]() |
Overview & Summary (I) | ![]() |
Some Important Environmental Conditions | ![]() |
0a - White Will Win the Ko-fight | ![]() |
E1 - Black Must not Connect the Hanezeki's Tail "Early" | ![]() |
E2 - "Slow" Ko-Threats do not Prevent the Punishment Semeai | ![]() |
E3 - Black's Atari on the Upper Edge as a Ko-Threat | ![]() |
E4 - About the (In-) Validity of Black's Nakade Ko-Threats | ![]() |
E4a - White's Group in the Top Left has Seven Liberties | ![]() |
E4b - White's Group in the Top Left has Six Liberties | ![]() |
E4c - White's Group in the Top Left has Five Liberties | ![]() |
E4d - White's Centre Group has Three Liberties | ![]() |
0b - If We Wanted That Black Wins | ![]() |
Overview & Summary (II) | ![]() |
0c - An Additional Outside Liberty for Black | ![]() |
0d - An Additional Outside Liberty for White | ![]() |
0e - Timing of the Ko-Capture (I) - Four Liberties for White | ![]() |
0f - Timing of the Ko-Capture (II) - Six Liberties for White | ![]() |
Filling-in of White's False Eyes in the Centre | ![]() |
0g - White Fills-in Her False Eye in the Hanezeki | ![]() |
0h - White Uses Her Sente Move in the Hanezeki "Late" | ![]() |
Overview & Summary (III) | ![]() |
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1a - Single Throw-in | ![]() |
1a1 - White's Gote Move in the Hanezeki | ![]() |
1a2 - White's Gote-Sente-Combination in the Hanezeki | ![]() |
1b - No Throw-in | ![]() |
1b1 - White Connects at the Hanezeki's Lower Cutting Point | ![]() |
1b1b - White Chooses the "Fake" Punishment Semeai | ![]() |
1b2 - White Connects at the Hanezeki's Upper Cutting Point | ![]() |
1b2b - White Must Revert to the Single Throw-in | ![]() |
1b2c - Black Cannot Prevent White's Reversion | ![]() |
2a - Hanezeki Exchange | ![]() |
2b - White's Gote-Sente-Combination | ![]() |
3 - Black's Variation with Move 55 | ![]() |
4 - Black's Variation with Move 63 | ![]() |
4a - White's Kikashi in the Top Left Corner | ![]() |
4a1 - White's Second, but Unneeded, Kikashi to Gain Additional Ko-Threats | ![]() |
4a2 - White's Second, but Unneeded, Kikashi to Gain Additional Ko-Threats (II) | ![]() |
4b - White Starts the Ko "Early" | ![]() |
4b1 - Black Should Not Utilize his Ko-Threats in the Hanezeki | ![]() |
5 - Michael Redmond's Kikashi with Move 71 | ![]() |
5a - White Answers with the Atari | ![]() |
5b - White Answers with the Solid Connection | ![]() |
5c - White Takes the Guzumi Point | ![]() |
6 - No Black Throw-in in the Centre with Move 85 | ![]() |
7a - Joachim's Solid Shape with Moves 87 / 89 | ![]() |
7a1 - Black's Mistaken Atari from Below | ![]() |
7a2 - Black plays from the Left Without Cutting First | ![]() |
7a3 - If Black had not played Michael Redmond's Kikashi | ![]() |
7b - Larger Eye for White with Moves 87 / 88 | ![]() |
8a - Shared Ko in the Centre (with Smaller Eye) | ![]() |
Black Connects the Hanezeki's Tail First | ![]() |
8a1 - White Must Not Fill-in her Second False Eye "Early" | ![]() |
Black Occupied a Shared Liberty, Instead of an External One | ![]() |
8a2 - White Must not Enforce the Smaller Black Eye From Below | ![]() |
8a3 - If Michael Redmond's Kikashi in the Bamboo Joint was Played Already | ![]() |
8b - Shared Ko and External Ko on the Upper Edge | ![]() |
Invalid Ko-Threats (I) - Black's Atari on the Upper Edge | ![]() |
Invalid Ko-Threats (II) - Black Threatens White's Left Side | ![]() |
Invalid Ko-Threats (III) - Black Owns Real External Threats | ![]() |
9a - External Ko on the Upper Edge (with Larger Eye) | ![]() |
9b - White Kills Black's Group in the Lower Left | ![]() |
8c - Smaller Eye in the Centre | ![]() |
10 - "Fake" Punishment Semeai | ![]() |
11 - Black Does Without Michael Redmond's Kikashi in the Bamboo Joint | ![]() |
12 - White's "Early" Kikashi in the Upper Left Corner | ![]() |
12a - White's "Standard" Move on the Upper Edge | ![]() |
12b - White Secures Her Eye to the Right | ![]() |
12c - White Creates Another Ko-Shape in the Centre | ![]() |