(;GM[1]FF[4]SZ[19]
GN[Black sente]
PC[http://senseis.xmp.net/?RTGProblem86/Solution]AP[GoWiki:2009]
DT[2011-07-11]
C[Diagram from http://senseis.xmp.net/?RTGProblem86/Solution

Black sente]
PL[B]

AB[ba][ca][ga][gb][fc][hc][ad][bd][cd][dd][ed][fd]
AW[da][ea][bb][fb][ac][bc][cc][dc][ec]

;B[fa]C[B1]MN[1]
;W[cb]C[W2]MN[2]
;B[eb]C[B3]MN[3]
;W[aa]C[W4]MN[4]

;
)
