(;GM[1]FF[4]SZ[19]
GN[Main defence I.]
PC[http://senseis.xmp.net/?TsumegoFromGames44/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?TsumegoFromGames44/Solution

Main defence I.]
PL[W]

AB[ab][bb][cc][cd][be][ce][de][cf][bg][ah]
AW[ba][cb][db][dc][dd][ee][df][ff][cg][dg][bh][bi]
LB[ac:b][ae:a]

;W[ad]C[W1]MN[1]
;B[bd]C[B2]MN[2]

;LB[ac:b][ae:a]
)
