(;GM[1]FF[4]SZ[19]
GN[If White plays at 'b'...]
PC[http://senseis.xmp.net/?BeginnerExercise18/Attempts]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?BeginnerExercise18/Attempts

If White plays at 'b'...]
PL[B]

AB[ga][ia][gb][kb][lb][hc][ic][jc][kc]
AW[ja][fb][ib][jb][mb][ec][gc][lc][nc][gd][hd][id][jd][kd]
CR[ia][jb]
LB[fa:a][la:b]

;B[hb]C[B1]MN[1]
;W[ha]C[W2]MN[2]
;B[ka]C[B3]MN[3]

;CR[ia][jb]
LB[fa:a][la:b]
)
