(;GM[1]FF[4]SZ[19]
GN[The vital point]
PC[https://senseis.xmp.net/?LargeAvalancheTurnInward]AP[GoWiki:2009]
DT[2022-10-06]
C[Diagram from https://senseis.xmp.net/?LargeAvalancheTurnInward

The vital point]
PL[B]

AB[cb][db][eb][dc][bd][cd][ce][bf][cf][dg][ch]
AW[bb][bc][cc][ec][fc][dd][de][df][bg][cg][bh]
LB[ab:a]

;B[fe]C[B11]MN[11]
;W[ef]C[W12]MN[12]
;B[dh]C[B13]MN[13]
;W[ad]C[W14]MN[14]
;B[ae]C[B15]MN[15]
;W[fb]C[W16]MN[16]
;B[ba]C[B17]MN[17]
;W[ci]C[W18]MN[18]
;B[di]C[B19]MN[19]
;W[cj]C[W20]MN[20]

;LB[ab:a]
)
