(;GM[1]
FF[4]
AP[Hibiscus:2.1]
SZ[19]
ST[3]
;AB[bl][bn][cn][dn][dq][en][eq][fo][fq][gp][gr]
AW[an][bo][br][co][cp][dp][ep]
PL[B]
C[Black to kill]
(;B[ds]
(;W[cs]
C[Black 1 make a good use of the marked stone.]
TR[gr]LB[ds:1](;B[cr]
;W[bs]
(;B[ap]
;W[ao]
(;B[bq]
;W[cq]
(;B[ar]
;W[dr]
;B[es]
C[RIGHT
Now we can see how the two marked stones
works together.]
TR[gr][ds])(;B[dr]
;W[bp]
C[White lives.]
)(;B[aq]
;W[dr]
C[White lives.]
))(;B[ar]
;W[bq]
C[White lives.]
)(;B[cq]
;W[bq]
C[White lives.]
))(;B[cq]
;W[bq]
C[White lives.]
)(;B[bq]
;W[cq]
(;B[dr]
;W[aq]
C[White lives.]
)(;B[ap]
;W[ar]
(;B[ao]
;W[bp]
(;B[am]
;W[aq]
(;B[an]
;W[dr]
C[White lives.]
)(;B[dr]
;W[an]
C[White lives.]
))(;B[dr]
;W[aq]
C[White lives.]
))(;B[dr]
;W[ao]
C[White lives.]
))(;B[aq]
;W[dr]
C[White lives.]
)(;B[ar]
;W[dr]
C[White lives.]
)(;B[ao]
;W[ap]
C[White lives.]
))(;B[aq]
;W[cq]
(;B[dr]
;W[bq]
;B[ap]
;W[ar]
C[White lives.]
)(;B[ap]
;W[ao]
;B[dr]
;W[ar]
C[White lives.]
))(;B[ao]
;W[ap]
C[White lives.]
))(;B[ap]
;W[cq]
;B[ao]
;W[aq]
C[White lives.]
)(;B[bq]
;W[cq]
C[White lives.]
)(;B[cq]
;W[bq]
C[White lives.]
)(;B[aq]
;W[cq]
C[White lives.]
))(;W[cr]
;B[cs]
;W[bs]
;B[ap]
;W[ao]
;B[bq]
;W[cq]
;B[ar]
C[RIGHT]
)(;W[cq]
;B[bs]
C[RIGHT]
)(;W[bq]
;B[bs]
C[RIGHT]
)(;W[bs]
;B[ap]
;W[ao]
;B[bq]
;W[cq]
;B[ar]
C[RIGHT]
)(;W[aq]
;B[bs]
C[RIGHT]
))(;B[cq]
;W[bq]
C[White lives.]
)(;B[bq]
;W[cq]
C[White lives.]
)(;B[cr]
;W[cq]
(;B[bs]
;W[dr]
;B[ds]
;W[cs]
C[ko.]
)(;B[cs]
;W[bs]
C[White lives.]
)(;B[dr]
;W[bs]
C[White lives.]
)(;B[ap]
;W[cs]
C[White lives.]
)(;B[ar]
;W[dr]
C[White lives.]
)(;B[ds]
;W[bs]
C[White lives.]
))(;B[dr]
;W[aq]
(;B[bs]
;W[cs]
;B[cr]
;W[as]
;B[bq]
;W[cq]
;B[ds]
;W[bp]
;B[bs]
;W[ao]
C[ko.]
)(;B[bq]
;W[cq]
;B[bs]
;W[cs]
;B[cr]
;W[bp]
;B[ds]
;W[ao]
;B[ar]
;W[as]
C[ko.]
))(;B[cs]
;W[bs]
C[White lives.]
)(;B[bs]
;W[cr]
C[White lives.]
)(;B[ar]
;W[cq]
C[White lives.]
)(;B[aq]
;W[cr]
C[White lives.]
)(;B[ap]
;W[cq]
(;B[ao]
;W[aq]
C[White lives.]
)(;B[cr]
;W[cs]
(;B[dr]
;W[aq]
C[White lives.]
)(;B[ao]
;W[aq]
C[White lives.]
))))