(;GM[1]FF[4]SZ[19]
GN[How to answer B2?]
PC[http://senseis.xmp.net/?BeginnerExercise122]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?BeginnerExercise122

How to answer B2?]
PL[W]

AB[qm][mn][nn][pn][lo][qo][ro][lp][pp][lq][pq][lr][mr][pr]
AW[oo][po][mp][np][op][qp][mq][oq][nr][or]

;W[rq]C[W1]MN[1]
;B[rr]C[B2]MN[2]

;
)
