(;GM[1]FF[4]SZ[19]
GN[(B1 can also be at __''r''__ or __''s''__)]
PC[http://senseis.xmp.net/?XuanxuanQijingProblem74/Solution]AP[GoWiki:2009]
DT[2013-04-01]
C[Diagram from http://senseis.xmp.net/?XuanxuanQijingProblem74/Solution

(B1 can also be at __''r''__ or __''s''__)]
PL[B]

AB[oa][pa][jb][kb][pb][lc][mc][nc][oc][pc]
AW[ja][na][ib][nb][ob][qb][ic][jc][kc][qc][md][nd][pd][ke][pe]
LB[ma:r][lb:s]

;B[mb]C[B1]MN[1]
;W[ka]C[W2]MN[2]

;LB[ma:r][lb:s]
)
