EVENT BOARDSIZE 19 BLACK David Mitchell, 3d WHITE Frank May, ?d PLACE KOMI 5 RESULT B+Lots ANALYSIS David Mitchell RULES Japanese SOURCE BGJ 40, February 1978, Page 13 COM Copyright British Go Association 1978, 2004 ENDCOM B 1 q16 COM Black 1 - 7: Recently I have taken to playing hoshi fuseki, such as Black 1, Black 3 in this game, because this often leads to large moyos, which produces invasions and running fights which I feel I can handle well. ENDCOM W 2 c3 B 3 q4 W 4 e17 B 5 k16 MARK 6@c16 7@q10 COM Black 1 - 7: I played Black 5 intending to play next at either Black 7 or White 6. Frank made his shimari and I was happy to achieve san-ren-sei. ENDCOM W 6 c16 B 7 q10 W 8 o3 B 9 k4 COM Black 9 - 17: Black 9 is often played one point to the right. ENDCOM W 10 r6 COM Black 9 - 17: White 10 is an inappropriate response, reminescent of a handicap game ENDCOM B 11 p5 COM Black 9 - 17: Black 11 separates White 8, 10 and waits for White's response. ENDCOM W 12 r3 B 13 r4 MARK #12 COM Black 9 - 17: When White dives in with 12, Black 13 naturally cuts White off from the side on which Black expects to make the most territory... ENDCOM W 14 q3 B 15 n4 W 16 n3 B 17 m4 MARK #12-17 COM Black 9 - 17:When White dives in with 12, Black 13 naturally cuts White off from the side on which Black expects to make the most territory and this corner sequence ends with Black 15, 17 pressing White low against the edge and expanding Black's moyo which White will have to soon invade. ENDCOM W 18 d10 COM White 18 occupies the largest area remaining. One point to the left would be too low - Black could play one point to the right of 18 and keep White down while increasing his prospects on the right. ENDCOM B 19 d4 W 20 c4 B 21 b16 W 22 b17 MARK #21 A@b15 B@d5 COM Black 21, White 22: Black 21 is yosu-miru. If White 22' at 86 (A) to defend the outside and let Black live in the corner, Black 23' would be one above 19 (B), pressing White. The idea of playing 19 at all is to keep down White's potential area, while waiting for him to invade Black's moyo. ENDCOM B 23 d6 W 24 e4 B 25 e5 W 26 e3 B 27 g4 MARK #19 #23 #25 COM Black 27: Black's first definite error is Black 27; this should be one point higher. The knight's move, 25-27 can be broken by White attacking the stones 19-23-25. ENDCOM W 28 r13 MARK #1 #7 COM White 28 - 31: White's error follows. His invasion point 28 was poorly chosen and in poor relationship to Black 1 and Black 7. One point nearer to either 7 or 1 is better. Black naturally defends his corner with 29, White jumps to 30 and Black defends with 31. Black is making territory and attacking, while White 30 and 28 are loose and difficult to defend. ENDCOM B 29 r15 W 30 o13 B 31 o16 MARK #28-31 COM White 28 - 30: White's error follows. His invasion point 28 was poorly chosen and in poor relationship to Black 1 and Black 7. One point nearer to either 7 or 1 is better. Black naturally defends his corner with 29, White jumps to 30 and Black defends with 31. Black is making territory and attacking, while White 30 and 28 are loose and difficult to defend. ENDCOM W 32 o10 COM White 32 - 43: White 32 is another loose move and Black immediately pokes at White's weaknesses with 33. White dives underneath for eye space with 34 and, up to Black 43, White is split in two and will only succeed in living with one half of his stones. ENDCOM B 33 p11 W 34 s10 MARK #32-34 COM White 32 - 43: White 32 is another loose move and Black immediately pokes at White's weaknesses with 33. White dives underneath for eye space with 34 and, up to Black 43, White is split in two and will only succeed in living with one half of his stones. ENDCOM B 35 r9 W 36 s9 B 37 s8 W 38 r8 B 39 r7 W 40 q8 B 41 s6 W 42 q7 B 43 s7 MARK #32-43 COM White 32 - 43: White 32 is another loose move and Black immediately pokes at White's weaknesses with 33. White dives underneath for eye space with 34 and, up to Black 43, White is split in two and will only succeed in living with one half of his stones. ENDCOM W 44 o8 MARK A@o11 COM White 44 looks like good shape, but this is the half that eventually dies, so perhaps 44' at 51 (A) is better. ENDCOM B 45 o12 W 46 r17 COM White 46 probes to see how Black will defend the corner. ENDCOM B 47 r16 MARK #29 COM Black 47 makes it difficult for White to live in the corner. 47' to the right of 29 would make it easy, but would attack the lower White stones more strongly. ENDCOM W 48 q12 COM 48 - 56 gives White space for eyes in exchange for greatly strengthening Black's position and making the death of the White stones 38, 40 etc., very probable. ENDCOM B 49 n12 W 50 p12 B 51 o11 W 52 r10 B 53 q9 W 54 q11 B 55 p10 W 56 p14 MARK #48-56 A@s12 COM 48 - 56 gives White space for eyes in exchange for greatly strengthening Black's position and making the death of the White stones 38, 40 etc., very probable. 56 should however be at 57 (A) - the vital point for eye-shape which Black immediately hits. ENDCOM B 57 s12 W 58 s13 B 59 s11 W 60 r11 B 61 t15 MARK #57 #59 COM Black 61 threatens to rescue 57-59, so White makes an eye with 62 and, not wanting to be shut in, answers 63 by pushing out, 64 etc., but this solidifes Black's top area, so maybe White should have made two eyes. ENDCOM W 62 q14 B 63 m14 W 64 n15 B 65 n16 W 66 m15 B 67 m16 W 68 l15 B 69 k15 W 70 l14 MARK #57-70 COM Black 61 threatens to rescue 57-59, so White makes an eye with 62 and, not wanting to be shut in, answers 63 by pushing out, 64 etc., but this solidifes Black's top area, so maybe White should have made two eyes. ENDCOM B 71 l12 W 72 l9 B 73 n14 W 74 o15 B 75 j12 W 76 p17 B 77 p16 W 78 l13 B 79 m12 W 80 j13 COM White 80-Black 83 sees White finally out in the open with chances of making territory on the left, but at the heavy cost of seeing his lower right stones die. ENDCOM B 81 j9 W 82 h12 B 83 j11 MARK #80-83 COM White 80 - Black 83 sees White finally out in the open with chances of making territory on the left, but at the heavy cost of seeing his lower right stones die. ENDCOM W 84 h15 B 85 c15 W 86 b15 B 87 d16 W 88 c17 B 89 b14 W 90 a16 PRISONER b16 B 91 h11 W 92 g12 B 93 j17 MARK #85-93 COM After 85 - 87, which is a standard way of using the stone at 21, followed by 91 - 92 and 93 which defends Black 's upper side, Black has three ways to reduce White 's left hand moyo: By pushing in from 91, through the gap between 4 and 84, or by using 85, 87, 89. So White's prospects in this area are not as bright as they may appear at first glance. ENDCOM W 94 j6 B 95 k7 W 96 f5 B 97 f6 W 98 g5 B 99 h4 W 100 g6 MARK A@f4 #94-100 COM White 94 - 100 presses back Black's area a little and isolates the 4 Black stones. However, at this late stage in the game, the White stones cut off by Black 101 (A) have nowhere to go, and the best that White can manage is to secure his left edge territory and cut Black off from centre left in exchange for giving Black some lower edge area. ENDCOM B 101 f4 W 102 f7 B 103 e7 W 104 e8 B 105 g7 W 106 e6 PRISONER f6 B 107 d5 W 108 d7 PRISONER e7 B 109 d3 W 110 d2 B 111 e2 W 112 k6 B 113 l7 W 114 c6 B 115 f3 PRISONER e4 e3 W 116 c5 B 117 j14 W 118 t13 B 119 h14 W 120 f14 B 121 o14 W 122 p13 B 123 p15 W 124 h13 B 125 g14 W 126 g15 B 127 f15 W 128 e15 B 129 f13 W 130 e14 B 131 g13 W 132 k14 B 133 j15 W 134 f11 B 135 f12 W 136 g11 B 137 d12 MARK #118 COM The sequence to 137 forces White to go back after all to live with 118 and ends White's hopes of large left edge area. His last hope, which would scarcely be enough even if it were successful, is to take away Black's upper right corner. ENDCOM W 138 s16 B 139 s15 W 140 s18 MARK #138-140 COM White 138, 140 are a standard way of trying to make eye shape in the corner. If Black pushes to the right of 138, White stops him immediately and forces a ko... ENDCOM B 141 o18 COM ... So I played 141, without being able to read out all the possibilities, and being prepared to see White live in gote. After the game we discovered that there is a sequence for White to live; it's very difficult and will be found in the variation to 142. ENDCOM W 142 h18 COM The exchange 142 for 143 spoils the variation. ENDCOM VAR W 142 q18 B 143 t17 W 144 t18 B 145 r19 W 146 s19 B 147 q19 W 148 p18 B 149 p19 W 150 o17 B 151 n18 W 152 n17 B 153 m18 W 154 o19 B 155 n19 PRISONER o19 W 156 m17 B 157 l18 W 158 l17 ENDVAR B 143 j18 W 144 l18 B 145 m17 COM Black won by a large margin ENDCOM