(;GM[1]FF[4]SZ[19]
GN[Black to play]
PC[http://senseis.xmp.net/?XuanxuanQijingProblem279/Attempts]AP[GoWiki:2009]
DT[2013-04-01]
C[Diagram from http://senseis.xmp.net/?XuanxuanQijingProblem279/Attempts

Black to play]
PL[B]

AB[am][bm][cm][cn][dn][fn][eo][ep][eq][cr][dr][fr][cs]
AW[bn][bo][do][dp][bq][dq][br][bs]

;B[bp]C[B1]MN[1]
;W[ap]C[W2]MN[2]
;B[cp]C[B3]MN[3]

;
)
