Event Setup B c19 a18 c17 e18 Setup W g19 g18 g17 g16 g15 f15 e15 d15 c15 b15 a15 Com Philosophy: General the main branch is for the "correct" move. Variations are for Incorrect moves. Where a correct move is obvious, other incorrect moves may not be investigated. Where all moves fail, most will be investigated with the "best" being the main branch. EndCom W 1 e19 VAR W 1 b19 Com A wrong white attack EndCom B 2 e17 Com The right black reply EndCom VAR B 2 b18 Com Seems a strong black response, but it doesn't work EndCom W 3 d18 Com This kills black regardless how he struggles EndCom B 4 d17 W 5 e19 B 6 d19 VAR B 6 c18 W 7 e17 B 8 d19 Prisoner d18 Mark ALL Com Only 1 eye in the corner EndCom ENDVAR VAR B 6 e17 W 7 d19 B 8 c18 W 9 f19 Mark ALL ENDVAR W 7 f19 VAR W 7 c18 Prisoner c19 d19 Com This also works for white EndCom B 8 d19 W 9 c19 Prisoner d19 B 10 a19 W 11 f19 B 12 d19 Prisoner b19 c19 c18 d18 b19 c19 c18 d18 W 13 c19 B 14 c18 W 15 e17 B 16 b16 W 17 a16 B 18 a17 W 19 c16 Mark ALL ENDVAR B 8 e17 VAR B 8 c18 Prisoner d18 W 9 e17 Mark f19 d19 e19 d17 3@d18 b18 b19 ALL ALL ALL Com Only 1 eye for black in the corner EndCom ENDVAR W 9 c18 Prisoner c19 d19 B 10 d19 W 11 c19 Prisoner d19 B 12 a19 W 13 d19 Mark ALL Com No eyes EndCom ENDVAR VAR B 2 b17 W 3 d19 B 4 b18 VAR B 4 e19 W 5 c18 Prisoner c19 B 6 d17 VAR B 6 e17 W 7 d16 B 8 d17 W 9 a16 B 10 a17 W 11 b16 B 12 b14 W 13 c16 B 14 c14 W 15 e16 B 16 e14 W 17 f17 B 18 h17 W 19 f18 B 20 h18 W 21 f19 B 22 h19 W 23 d18 B 24 h14 W 25 b18 Mark ALL Com Not a seki EndCom ENDVAR W 7 e17 VAR W 7 d18 B 8 e16 W 9 f17 B 10 e17 W 11 a16 B 12 a17 W 13 b16 B 14 b13 W 15 c16 B 16 c13 W 17 d16 B 18 d13 W 19 f16 B 20 f13 W 21 f18 B 22 j18 W 23 f19 B 24 j19 W 25 b18 B 26 j13 W 27 a19 Prisoner a18 a17 b17 c17 d17 e19 e18 e17 e16 Mark ALL ENDVAR B 8 d18 W 9 c19 Mark ALL ENDVAR W 5 d18 B 6 d17 W 7 e19 B 8 c18 W 9 f19 Mark ALL ENDVAR VAR B 2 c18 W 3 d17 B 4 d18 VAR B 4 e17 W 5 d16 B 6 e19 W 7 d18 B 8 b16 W 9 b18 B 10 b17 W 11 a16 Mark ALL ENDVAR VAR B 4 e19 W 5 d18 B 6 d16 W 7 e17 Mark ALL Com Black 1 eye EndCom ENDVAR W 5 e19 B 6 d16 W 7 e17 B 8 f18 W 9 f19 Mark ALL ENDVAR VAR B 2 d19 W 3 b18 B 4 b17 VAR B 4 c18 W 5 b17 B 6 b16 W 7 a17 B 8 c16 W 9 a16 Mark ALL Com No eyes (or one if black persists) EndCom ENDVAR VAR B 4 d17 W 5 b17 B 6 b16 W 7 a17 Com White could actally tenuki here EndCom VAR W 7 b14 B 8 a17 W 9 c16 B 10 c18 W 11 a16 Prisoner b16 Mark ALL Com Still only 1 black eye EndCom ENDVAR B 8 c16 W 9 a16 Mark ALL Com Maybe 1 eye EndCom ENDVAR W 5 d17 B 6 e17 W 7 d16 Mark ALL Com Black 1 eye EndCom ENDVAR VAR B 2 d18 W 3 b18 Com This is essential. white can easily get it wrong EndCom VAR W 3 e19 B 4 b18 W 5 d17 B 6 b17 W 7 f19 B 8 d19 W 9 e17 B 10 a19 Prisoner b19 Mark ALL Com When white does it wrongly EndCom ENDVAR B 4 b17 VAR B 4 e19 W 5 b17 B 6 b16 W 7 a17 B 8 c16 W 9 a16 Mark ALL ENDVAR W 5 e19 Mark ALL Com 1 Black eye EndCom ENDVAR VAR B 2 d17 W 3 b18 B 4 b17 W 5 e19 VAR W 5 d19 Com Wrong EndCom B 6 e19 W 7 c18 Prisoner c19 B 8 e17 Mark ALL Com This seki shows white went wrong EndCom ENDVAR B 6 d19 W 7 f19 B 8 e17 W 9 c18 B 10 a17 W 11 d18 Prisoner c19 d19 B 12 d19 W 13 c19 Prisoner d19 B 14 a19 W 15 d19 Mark ALL ENDVAR VAR B 2 e19 W 3 c18 B 4 d19 VAR B 4 e17 Com This doesn't work for black EndCom W 5 b18 B 6 b17 VAR B 6 b17 W 7 d18 B 8 d19 W 9 d16 B 10 d17 W 11 a16 B 12 a19 Prisoner b19 b18 c18 d18 Mark ALL ENDVAR W 7 d19 Prisoner c19 B 8 d17 VAR B 8 d17 W 9 a16 B 10 a17 W 11 b16 B 12 b13 W 13 c16 B 14 c13 W 15 d16 B 16 d13 W 17 e16 B 18 e13 W 19 f17 B 20 j17 W 21 f18 B 22 j18 W 23 f19 B 24 j19 W 25 d18 Mark ALL ENDVAR VAR B 8 d16 W 9 e16 B 10 c16 W 11 d18 VAR W 11 d17 B 12 d18 Prisoner d17 W 13 f17 B 14 a17 W 15 f18 B 16 a19 W 17 f19 B 18 c19 Prisoner b19 b18 c18 d19 b19 b18 c18 Mark ALL ENDVAR B 12 d17 Mark ALL ENDVAR W 9 a16 B 10 a17 Com This looks like a seki, but wait a while... EndCom W 11 b16 B 12 b14 W 13 c16 B 14 c14 W 15 d16 B 16 d14 W 17 e16 B 18 e14 W 19 f17 B 20 h17 W 21 f18 B 22 h18 VAR B 22 d18 Com Folly by black EndCom W 23 c19 B 24 a19 Prisoner b19 b18 c19 c18 d19 W 25 c19 B 26 b19 W 27 c18 Mark ALL ENDVAR W 23 f19 B 24 h19 W 25 d18 Mark ALL Com So it isn't seki after all EndCom ENDVAR VAR B 4 b18 W 5 d19 Prisoner c19 B 6 d18 W 7 c19 Mark ALL Com Black dies EndCom ENDVAR VAR B 4 e17 W 5 b18 B 6 b17 W 7 d19 Prisoner c19 Com Leads to a not-seki EndCom B 8 d17 Mark ALL ENDVAR W 5 b18 B 6 b17 W 7 d17 Mark ALL Com Black dies EndCom ENDVAR W 3 e19 Com The strongest white attack in this position. It leads to a black seki rather than absolute black life. EndCom VAR W 3 c18 B 4 d19 W 5 b18 VAR W 5 b17 B 6 b18 W 7 d17 B 8 d18 Prisoner c18 W 9 d16 B 10 b16 W 11 a16 B 12 a17 Prisoner b17 W 13 c16 B 14 b17 Mark ALL Com Black lives EndCom ENDVAR VAR W 5 d18 B 6 e19 W 7 b17 B 8 b18 W 9 d16 B 10 d17 Prisoner c18 d18 W 11 c18 B 12 d18 Prisoner c18 W 13 a17 B 14 a19 Prisoner b19 Mark ALL Com Black lives EndCom ENDVAR B 6 b17 W 7 d17 B 8 d16 W 9 e16 B 10 c16 Mark ALL Com Black lives EndCom ENDVAR VAR W 3 b18 B 4 b17 W 5 e19 B 6 d19 W 7 f19 B 8 c18 W 9 d17 B 10 d16 W 11 e16 B 12 c16 Mark ALL Com Black lives EndCom ENDVAR VAR W 3 b17 B 4 b18 W 5 d18 VAR W 5 d19 B 6 e19 W 7 c18 Prisoner c19 B 8 d18 W 9 c19 B 10 c16 W 11 d16 B 12 b16 W 13 a16 B 14 a17 Prisoner b17 W 15 d17 B 16 a19 Prisoner b19 c19 c18 d19 Mark ALL ENDVAR VAR W 5 d17 B 6 d18 W 7 e19 B 8 d16 Prisoner d17 Mark ALL ENDVAR B 6 d19 W 7 d17 B 8 d16 W 9 c16 B 10 c18 Prisoner d18 d17 W 11 e16 B 12 d17 Mark ALL ENDVAR VAR W 3 d19 B 4 c18 W 5 e19 B 6 d18 W 7 f19 VAR W 7 d16 B 8 f19 Prisoner d19 e19 W 9 f18 B 10 e19 W 11 b18 B 12 b17 Mark ALL ENDVAR B 8 d16 W 9 c16 B 10 e16 W 11 b18 B 12 b17 Mark ALL ENDVAR VAR W 3 d18 B 4 c18 W 5 e19 B 6 d19 W 7 b18 B 8 b17 W 9 d16 B 10 d17 Prisoner d18 Mark ALL ENDVAR VAR W 3 d17 B 4 d18 W 5 b17 B 6 b18 W 7 c16 B 8 d16 Prisoner d17 W 9 e16 B 10 d17 W 11 e19 B 12 d19 Mark ALL ENDVAR B 4 d19 Com This is the seki variant EndCom VAR B 4 b18 Com Black hoped that this would lead to a ko, but the right white response kills. EndCom W 5 d18 VAR W 5 d19 Com Bad white play leading to a ko for Black. EndCom B 6 d18 W 7 c18 Prisoner c19 B 8 b13 Com ko threat EndCom W 9 c13 B 10 c19 Prisoner c18 Com retake ko EndCom W 11 b12 Com ko threat (ignored) EndCom B 12 f19 Prisoner d19 e19 W 13 f18 B 14 e19 Mark ALL Com Two eyes, but play really shouldn't get here EndCom ENDVAR B 6 d19 W 7 c18 Prisoner c19 d19 B 8 d19 W 9 c19 Prisoner d19 B 10 d17 W 11 f19 B 12 a19 W 13 d19 Mark ALL ENDVAR W 5 b18 VAR W 5 c18 B 6 f19 Prisoner e19 W 7 b17 B 8 b18 W 9 d17 B 10 d18 Prisoner c18 W 11 d16 B 12 f18 Mark ALL Com Two eyes EndCom ENDVAR B 6 b17 W 7 c18 B 8 f19 Prisoner e19 W 9 d16 B 10 d17 W 11 f18 B 12 e19 Mark ALL ENDVAR VAR W 1 b18 B 2 b17 Com Forced (Else white connects to lower wall, see variations) EndCom VAR B 2 c18 W 3 b17 B 4 b16 W 5 a17 B 6 c16 W 7 a16 Mark ALL Com So black gets 1 eye in the centre EndCom ENDVAR W 3 b19 Com Forced else Black gets an eye in the corner and at the 2-2 point. EndCom VAR W 3 c18 B 4 b19 W 5 d18 B 6 d17 W 7 e19 B 8 d19 Prisoner b18 c18 d18 Mark ALL ENDVAR B 4 e17 VAR B 4 c18 W 5 d17 B 6 d18 W 7 e19 Mark ALL ENDVAR VAR B 4 e19 W 5 c18 B 6 d18 Mark ALL VAR B 6 d19 W 7 d17 B 8 d18 Mark ALL ENDVAR ENDVAR W 5 c18 VAR W 5 d19 B 6 c18 W 7 e19 B 8 d18 W 9 d16 VAR W 9 f19 B 10 d16 W 11 e16 B 12 c16 Mark ALL Com 2 eyes EndCom ENDVAR B 10 f19 Prisoner d19 e19 Mark ALL VAR B 10 f19 Prisoner d19 e19 W 11 e19 B 12 f18 Mark ALL ENDVAR ENDVAR VAR W 5 e19 B 6 c18 W 7 d19 B 8 d18 W 9 d16 B 10 f19 Prisoner d19 e19 W 11 f18 B 12 e19 Mark ALL ENDVAR B 6 d19 VAR B 6 e19 W 7 d19 Prisoner c19 B 8 d16 W 9 e16 B 10 c16 W 11 f17 B 12 a17 W 13 f18 B 14 d18 W 15 f19 B 16 c19 Prisoner d19 Mark ALL Com ko fo 3 eyes EndCom ENDVAR VAR B 6 d18 W 7 e19 B 8 d16 VAR B 8 d19 W 9 d16 Mark ALL ENDVAR W 9 d19 Prisoner c19 Mark ALL ENDVAR W 7 f19 VAR W 7 d18 B 8 e19 W 9 d16 B 10 d17 W 11 a16 B 12 a19 Prisoner b19 b18 c18 d18 Mark ALL Com 2 eyes EndCom ENDVAR B 8 e19 W 9 d16 B 10 d17 Mark ALL Com Seki EndCom ENDVAR VAR W 1 b17 B 2 b18 Com No other Black move stands a chance. For example see variation EndCom VAR B 2 c18 W 3 b18 B 4 b16 W 5 a17 B 6 c16 W 7 a16 B 8 f18 W 9 f19 B 10 e19 W 11 d17 B 12 d16 W 13 e17 B 14 e16 W 15 f17 B 16 d18 Mark ALL Com Awful EndCom ENDVAR W 3 d17 B 4 d18 W 5 c16 VAR W 5 e19 B 6 b16 W 7 c16 B 8 a17 Prisoner b17 W 9 a16 B 10 b17 W 11 f19 B 12 d19 Mark ALL Com An obvious sequence that lets Black live with two eyes. 10 played at captured White 1 EndCom ENDVAR B 6 e19 Mark ALL Com ko for life EndCom ENDVAR VAR W 1 c18 B 2 b18 W 3 d17 B 4 d18 Prisoner c18 W 5 e19 B 6 b17 W 7 f19 B 8 d19 Mark ALL Com 2 eyes easily EndCom ENDVAR VAR W 1 d19 B 2 d18 W 3 b17 VAR W 3 b19 B 4 c18 W 5 b17 B 6 b18 Mark ALL Com Easily 2 eyed EndCom ENDVAR B 4 b18 Mark ALL Com Obviously two eyed EndCom ENDVAR VAR W 1 d18 B 2 d17 Com The essential Black 2. EndCom VAR B 2 e17 Com Whilst this moves is good in many other situations, it is a mistake here. EndCom W 3 d17 B 4 d16 W 5 c16 B 6 e16 W 7 b17 B 8 c18 W 9 b18 Mark ALL Com 1 eye EndCom ENDVAR W 3 e19 B 4 d19 W 5 b19 B 6 c18 Prisoner d18 W 7 b18 B 8 b17 W 9 e17 B 10 f19 Prisoner e19 W 11 f18 B 12 e19 W 13 a16 B 14 a17 Mark ALL Com Two eyes EndCom ENDVAR VAR W 1 d17 B 2 d18 VAR B 2 d18 W 3 e19 VAR W 3 b18 B 4 b17 W 5 b19 VAR W 5 e19 B 6 b19 Mark ALL Com Two eyes EndCom ENDVAR B 6 e19 Mark ALL Com Two eyes EndCom ENDVAR B 4 b18 W 5 b17 B 6 b16 W 7 c16 B 8 a17 Prisoner b17 W 9 a16 B 10 b17 W 11 f19 B 12 d19 Mark ALL Com Two eyes EndCom ENDVAR W 3 e19 B 4 b18 W 5 b17 B 6 b16 W 7 c16 B 8 a17 Prisoner b17 W 9 a16 B 10 b17 W 11 f19 B 12 d19 Mark ALL ENDVAR B 2 e17 Com The strongest black reply EndCom VAR B 2 b19 W 3 d18 B 4 c18 VAR B 4 b18 W 5 d17 B 6 b16 W 7 a16 B 8 a17 W 9 c16 Mark ALL Com Still one eye EndCom ENDVAR VAR B 4 b17 W 5 c18 B 6 d17 W 7 e17 Mark ALL ENDVAR VAR B 4 d17 W 5 e17 B 6 c18 W 7 b17 B 8 d19 Prisoner d18 W 9 f19 Mark ALL ENDVAR W 5 b17 B 6 d17 W 7 e17 B 8 d19 Prisoner d18 W 9 f19 B 10 b16 W 11 a17 Mark ALL Com One eye only EndCom ENDVAR VAR B 2 b18 W 3 d18 B 4 d17 W 5 d19 B 6 b16 Mark ALL Com One eye EndCom ENDVAR VAR B 2 b17 W 3 d18 B 4 b19 VAR B 4 c18 W 5 b19 B 6 e17 W 7 d19 Mark ALL ENDVAR W 5 c18 B 6 e17 W 7 d19 Mark ALL ENDVAR W 3 c16 Com The right White 3 EndCom VAR W 3 b19 B 4 d19 Com This is the crucial reply to White 3 EndCom W 5 c18 B 6 f19 Prisoner e19 W 7 b18 VAR W 7 b17 B 8 b18 W 9 d17 B 10 d18 Prisoner c18 W 11 d16 B 12 f18 Mark ALL Com Two eyes - awful for White EndCom ENDVAR VAR W 7 d18 B 8 e19 W 9 b18 B 10 b17 Mark ALL Com Four stones in a row, Black captures and lives with eyes EndCom VAR B 10 b17 W 11 d16 B 12 d17 W 13 a16 B 14 a19 Prisoner b19 b18 c18 d18 W 15 b18 B 16 c18 W 17 a17 B 18 b19 Prisoner b18 Mark ALL Com For example EndCom ENDVAR ENDVAR B 8 b17 W 9 d16 B 10 d17 Mark ALL Com Seki White 3 didn't work EndCom ENDVAR VAR W 3 b18 B 4 b17 W 5 b19 VAR W 5 c18 B 6 b19 W 7 d18 B 8 d17 Mark ALL Com White = yuk! EndCom ENDVAR B 6 d19 W 7 f19 B 8 c18 W 9 d16 B 10 d17 Mark ALL ENDVAR VAR W 3 b17 B 4 b18 W 5 d18 VAR W 5 d17 B 6 d16 W 7 d18 B 8 d19 W 9 c16 B 10 c18 Prisoner d18 d17 W 11 e16 B 12 d17 Mark ALL ENDVAR B 6 d19 W 7 d17 B 8 d16 W 9 c16 B 10 c18 Prisoner d18 d17 W 11 e16 B 12 d17 Mark ALL ENDVAR VAR W 3 d18 B 4 d19 W 5 c18 B 6 f19 Prisoner e19 W 7 b19 B 8 e19 W 9 d16 B 10 d17 W 11 b17 B 12 b18 Prisoner c18 d18 Mark ALL Com No ggod for white EndCom ENDVAR B 4 d16 VAR B 4 d19 W 5 b17 B 6 b18 W 7 d17 B 8 d18 W 9 d16 Mark ALL ENDVAR VAR B 4 b18 W 5 d18 B 6 d19 VAR B 6 d17 W 7 d19 Mark ALL ENDVAR VAR B 6 c18 W 7 d17 B 8 d19 W 9 d16 Mark ALL ENDVAR W 7 d17 B 8 b16 W 9 a16 Mark ALL ENDVAR VAR B 4 b17 W 5 b19 VAR W 5 b19 B 6 b18 W 7 d19 B 8 d18 W 9 f19 B 10 a19 Prisoner b19 Mark ALL Com That didn't work for white EndCom ENDVAR VAR W 5 d19 B 6 d18 W 7 f19 B 8 b18 Mark ALL Com No good either EndCom ENDVAR VAR W 5 d18 B 6 c18 W 7 b19 B 8 d17 W 9 f19 B 10 d19 Prisoner d18 Mark ALL ENDVAR B 6 b18 W 7 d18 B 8 d17 W 9 d19 B 10 c18 W 11 f19 Mark ALL ENDVAR VAR B 4 b19 W 5 b17 B 6 b18 W 7 d18 B 8 d19 W 9 d17 Mark ALL ENDVAR VAR B 4 d18 W 5 b18 B 6 b17 W 7 b19 B 8 d16 W 9 e16 Mark ALL ENDVAR W 5 b19 B 6 c18 Com Gets one eye in the corner EndCom VAR B 6 b18 W 7 d18 B 8 c18 VAR B 8 d19 W 9 c18 Prisoner c19 d19 B 10 d19 W 11 c19 Prisoner d19 B 12 d17 W 13 d19 B 14 a19 W 15 f19 Mark ALL Com Not quick enough for Black EndCom ENDVAR W 9 d19 Mark ALL ENDVAR VAR B 6 d19 W 7 c18 B 8 d18 W 9 b18 B 10 b17 W 11 e16 B 12 f19 Prisoner e19 W 13 f18 B 14 a19 Prisoner b19 b18 c18 W 15 b18 Mark ALL Com EndCom ENDVAR VAR Com Suggested by J.G. EndCom B 6 d18 W 7 b18 VAR W 7 e16 B 8 b18 W 9 b17 B 10 d17 W 11 f19 B 12 d19 Mark ALL Com Two eyed. EndCom ENDVAR B 8 b17 W 9 e16 B 10 d17 Mark ALL ENDVAR W 7 e16 B 8 d17 W 9 d19 Mark ALL