(;GM[1]FF[4]SZ[19]
GN[Black forces a seki]
PC[http://senseis.xmp.net/?DochiYoseTesuji]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?DochiYoseTesuji

Black forces a seki]
PL[B]

AB[ea][fa][fb][gb][ec][bd][ed][fd][fe][ff][gf][bg][cg][fg][ah][ch][dh][gh][bi][ei][fi]
AW[da][db][eb][dc][fc][gc][dd][gd][ce][ee][ge][af][bf][cf][df][ef][ag][dg][eg][gg][eh][fh][gi]

;B[bb]C[B1]MN[1]
;W[cd]C[W2]MN[2]
;B[ca]C[B3]MN[3]
;W[bc]C[W4]MN[4]
;B[ac]C[B5]MN[5]
;W[cc]C[W6]MN[6]
;B[cb]C[B7]MN[7]

;
)
