(;GM[1]FF[4]SZ[19]
GN[How does white stop two eyes? B3 at WC]
PC[http://senseis.xmp.net/?BeginnerExercise221/Solution]AP[GoWiki:2009]
DT[2011-06-15]
C[Diagram from http://senseis.xmp.net/?BeginnerExercise221/Solution

How does white stop two eyes? B3 at WC]
PL[B]

AB[kl][kn][ln][mn][nn][on][mo][ro][jp][kp][lp][np][pp][qp][rp][kq][oq][rq][pr][qr][rr][rs]
AW[nl][mm][pm][qm][rn][ko][oo][po][qo][so][mp][op][iq][jq][lq][pq][kr][lr][mr][nr][or][ps][qs]
CR[ps]
LB[sp:a][sq:a][sr:a]

;B[os]C[B1]MN[1]
;W[ns]C[W2]MN[2]

;CR[ps]
LB[sp:a][sq:a][sr:a]
)
