(;GM[1]FF[4]CA[UTF-8]AP[CGoban:2]ST[2]
RU[Japanese]SZ[13]KM[0.00]TM[]
PW[White]PB[Black]AW[eb][hb][ec][hc][ic][jc][fd][gd][ge][gf]AB[db][gb][dc][gc][cd][ed][hd][id][ee][hf][if][fg][gg]C[Black to play to capture White's six stones. ]
(;B[fa]CR[fa]
;W[ea]CR[ea]
;B[fc]LB[fa:1]CR[fc]C[RIGHT Black 1 is the vital point. Black can rescue its two stones and capture White's stones.])
(;B[ea]CR[ea]
;W[fa]CR[fa]
(;B[fc]CR[fc]
;W[da]LB[ea:1][fa:2]CR[da]C[If Black 1, White occupies the vital point 2 and Black cannot save its stones.])
(;B[fb]CR[fb]
;W[fc]CR[fc]
(;B[ga]CR[ga]
;W[ha]TR[ga][fb][gb][gc]CR[ha]C[Black loses the four marked stones.])
(;B[da]CR[da]
;W[ga]CR[ga]))
(;B[ga]CR[ga]
;W[fc]CR[fc]
(;B[fb]CR[fb]
;W[ha]TR[ga][fb][gb][gc]CR[ha]C[Black loses the four marked stones.])
(;B[ha]CR[ha]
;W[ia]TR[ga][ha][gb][gc]CR[ia]C[Black loses the four marked stones.]
;B[fb]CR[fb]
;W[fa]CR[fa]))
(;B[da]CR[da]
;W[fb]CR[fb]))
(;B[fb]CR[fb]
;W[ea]CR[ea])
(;B[fc]CR[fc]
;W[fa]CR[fa]
(;B[fb]CR[fb]
;W[ga]CR[ga])
(;B[da]CR[da]
;W[ga]CR[ga])))