(;GM[1]FF[4]SZ[19]
GN[Forcing sequence]
PC[http://senseis.xmp.net/?KyuExercise40/Solution]AP[GoWiki:2009]
DT[2012-11-27]
C[Diagram from http://senseis.xmp.net/?KyuExercise40/Solution

Forcing sequence]
PL[B]

AB[ga][ha][fb][gb][ac][bc][ec][fc][cd][dd][ed]
AW[ia][cb][hb][ib][gc][hc][ad][bd][fd][gd][ae][ce][ee][bf][cf][ef]
CR[cb]
LB[aa:a]

;B[cc]C[B1]MN[1]
;W[db]C[W2]MN[2]
;B[bb]C[B3]MN[3]
;W[ba]C[W4]MN[4]
;B[ea]C[B5]MN[5]
;W[eb]C[W6]MN[6]
;B[ca]C[B7]MN[7]
;W[da]C[W8]MN[8]
;B[dc]C[B9]MN[9]
;W[fa]C[W10]MN[10]

;CR[cb]
LB[aa:a]
)
