(;GM[1]FF[4]SZ[19]
GN[Black plays the marked stone. And now?]
PC[http://senseis.xmp.net/?TesujiTheBook/Discussion]AP[GoWiki:2009]
DT[2016-05-06]
C[Diagram from http://senseis.xmp.net/?TesujiTheBook/Discussion

Black plays the marked stone. And now?]
PL[W]

AB[nm][pm][rm][nn][no][po][mp][op][mq][oq][nr][or]
AW[pk][rk][nl][ol][mm][om][mn][mo][np][pp][qp][nq][pq][pr]
SQ[nr]

;W[pn]C[W1]MN[1]
;B[oo]C[B2]MN[2]
;W[qo]C[W3]MN[3]

;SQ[nr]
)
