(;GM[1]FF[4]SZ[19]
GN[If white cooperates]
PC[http://senseis.xmp.net/?GokyoShumyoSection5Problem24/Solution]AP[GoWiki:2009]
DT[2009-11-18]
C[Diagram from http://senseis.xmp.net/?GokyoShumyoSection5Problem24/Solution

If white cooperates]
PL[B]

AB[cb][hb][bc][fc][gc][hc][cd][dd][ed]
AW[ha][fb][gb][ib][dc][ec][jc][fd][id][fe]

;B[ga]C[B1]MN[1]
;W[fa]C[W2]MN[2]
;B[eb]C[B3]MN[3]
;W[db]C[W4]MN[4]
;B[da]C[B5]MN[5]
;W[ea]C[W6]MN[6]
;B[ca]C[B7]MN[7]

;
)
