(;GM[1]FF[4]SZ[19]
GN[If black tries to pin at b then white lives]
PC[http://senseis.xmp.net/?BeginnerExercise5/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?BeginnerExercise5/Solution

If black tries to pin at b then white lives]
PL[B]

AB[ra][ob][sb][nc][pc][pd][qd][rd][sd]
AW[na][oa][pa][pb][qb][rb][qc][rc][sc]
CR[qa]
LB[lb:a]

;B[mb]C[B1]MN[1]

;CR[qa]
LB[lb:a]
)
