Joachim's Ko-Semeai - Putting the Cart
Before the Horse (2013 - 2015)
(Referenced by 227; 866; 1133) 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" ( 1133) too mathematical-oriented. At the same time, we realized that we accidentally had been too inattentive with respect to the correct order of moves, resulting in several issues, where we could have done better technically. 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 | 940 |
Overview & Summary (I) | 942 |
Some Important Environmental Conditions | 943 |
0a - White Will Win the Ko-fight | 944 |
E1 - Black Must not Connect the Hanezeki's Tail "Early" | 946 |
E2 - "Slow" Ko-Threats do not Prevent the Punishment Semeai | 947 |
E3 - Black's Atari on the Upper Edge as a Ko-Threat | 949 |
E4 - About the (In-) Validity of Black's Nakade Ko-Threats | 951 |
E4a - White's Group in the Top Left has Seven Liberties | 951 |
E4b - White's Group in the Top Left has Six Liberties | 952 |
E4c - White's Group in the Top Left has Five Liberties | 953 |
E4d - White's Centre Group has Three Liberties | 954 |
0b - If We Wanted That Black Wins | 954 |
Overview & Summary (II) | 960 |
0c - An Additional Outside Liberty for Black | 961 |
0d - An Additional Outside Liberty for White | 963 |
0e - Timing of the Ko-Capture (I) - Four Liberties for White | 965 |
0f - Timing of the Ko-Capture (II) - Six Liberties for White | 967 |
Filling-in of White's False Eyes in the Centre | 969 |
0g - White Fills-in Her False Eye in the Hanezeki | 971 |
0h - White Uses Her Sente Move in the Hanezeki "Late" | 974 |
Overview & Summary (III) | 976 |
@ | 976 |
@ | 978 |
@ | 979 |
@ | 980 |
@ | 981 |
@ | 982 |
@ | 983 |
@ | 984 |
@ | 985 |
@ | 986 |
@ | 988 |
@ | 989 |
1a - Single Throw-in | 990 |
1a1 - White's Gote Move in the Hanezeki | 991 |
1a2 - White's Gote-Sente-Combination in the Hanezeki | 991 |
1b - No Throw-in | 994 |
1b1 - White Connects at the Hanezeki's Lower Cutting Point | 995 |
1b1b - White Chooses the "Fake" Punishment Semeai | 997 |
1b2 - White Connects at the Hanezeki's Upper Cutting Point | 999 |
1b2b - White Must Revert to the Single Throw-in | 1001 |
1b2c - Black Cannot Prevent White's Reversion | 1002 |
2a - Hanezeki Exchange | 1003 |
2b - White's Gote-Sente-Combination | 1005 |
3 - Black's Variation with Move 55 | 1008 |
4 - Black's Variation with Move 63 | 1010 |
4a - White's Kikashi in the Top Left Corner | 1011 |
4a1 - White's Second, but Unneeded, Kikashi to Gain Additional Ko-Threats | 1014 |
4a2 - White's Second, but Unneeded, Kikashi to Gain Additional Ko-Threats (II) | 1016 |
4b - White Starts the Ko "Early" | 1017 |
4b1 - Black Should Not Utilize his Ko-Threats in the Hanezeki | 1021 |
5 - Michael Redmond's Kikashi with Move 71 | 1022 |
5a - White Answers with the Atari | 1022 |
5b - White Answers with the Solid Connection | 1023 |
5c - White Takes the Guzumi Point | 1025 |
6 - No Black Throw-in in the Centre with Move 85 | 1026 |
7a - Joachim's Solid Shape with Moves 87 / 89 | 1028 |
7a1 - Black's Mistaken Atari from Below | 1029 |
7a2 - Black plays from the Left Without Cutting First | 1032 |
7a3 - If Black had not played Michael Redmond's Kikashi | 1033 |
7b - Larger Eye for White with Moves 87 / 88 | 1034 |
8a - Shared Ko in the Centre (with Smaller Eye) | 1036 |
Black Connects the Hanezeki's Tail First | 1038 |
8a1 - White Must Not Fill-in her Second False Eye "Early" | 1040 |
Black Occupied a Shared Liberty, Instead of an External One | 1042 |
8a2 - White Must not Enforce the Smaller Black Eye From Below | 1043 |
8a3 - If Michael Redmond's Kikashi in the Bamboo Joint was Played Already | 1045 |
8b - Shared Ko and External Ko on the Upper Edge | 1047 |
Invalid Ko-Threats (I) - Black's Atari on the Upper Edge | 1051 |
Invalid Ko-Threats (II) - Black Threatens White's Left Side | 1052 |
Invalid Ko-Threats (III) - Black Owns Real External Threats | 1053 |
9a - External Ko on the Upper Edge (with Larger Eye) | 1055 |
9b - White Kills Black's Group in the Lower Left | 1059 |
8c - Smaller Eye in the Centre | 1064 |
10 - "Fake" Punishment Semeai | 1066 |
11 - Black Does Without Michael Redmond's Kikashi in the Bamboo Joint | 1068 |
12 - White's "Early" Kikashi in the Upper Left Corner | 1071 |
12a - White's "Standard" Move on the Upper Edge | 1072 |
12b - White Secures Her Eye to the Right | 1077 |
12c - White Creates Another Ko-Shape in the Centre | 1080 |