(;GM[1]FF[4]SZ[19]GN[Black is not dead yet!] PC[http\://senseis.xmp.net/?BeginnerExercise80]AP[GoWiki by Arno & Morten]DT[2002-07-11] AB[ca][ea][fa][ab][bb][eb][fb][cc][dc]AW[ga][gb][bc][ec][fc][gc][bd][cd][dd][ed]LB[ff:A] (;W[db] ;B[cb](;W[ac] ;B[da]C[Black survives.] ) (;W[ba] ;B[da]C[Black survives.] ) (;W[aa] ;B[da]C[Black survives.] ) (;W[da] ;B[eb]C[Although white has captured almost half of the group, black can regain what is needed for life.] (;W[ea] ;B[fa]C[Unless in the very late endgame, white's moves are wasted. It should better be kept as ko threats.] ) (;W[fa] ;B[ea]C[Unless in the very late endgame, white's moves are wasted. It should better be kept as ko threats.] ) (;W[fb] ;B[ea]C[Unless in the very late endgame, white's moves are wasted. It should better be kept as ko threats.] ) ) ) (;W[ff]C[RIGHT Right, black can defend white's attempt to kill. The attack at B should better be kept as a ko threat.]LB[db:B] ) (;W[cb] ;B[db]) (;W[da] ;B[db]) )