(;GM[1]FF[4]SZ[19]
GN[After W1, Black can't play at ''a'' immediately, but must make a ko threat first. If he doesn't have any suitable ko threats, his group will die.]
PC[http://senseis.xmp.net/?StoicalGo]AP[GoWiki:2009]
DT[2013-01-16]
C[Diagram from http://senseis.xmp.net/?StoicalGo

After W1, Black can't play at ''a'' immediately, but must make a ko threat first. If he doesn't have any suitable ko threats, his group will die.]
PL[W]

AB[da][ab][bb][cb][db][bc][bd][ae]
AW[ca][ea][eb][cc][dc][ec][cd][be][ce][af]
LB[ba:a]

;W[ad]C[W1]MN[1]

;LB[ba:a]
)
