(;AW[rp][sp][pq][rq][qr][qs]AB[sn][qo][ro][op][pp][qp][oq][or][os]C[black to kill ] (;B[sr] ;W[rr] (;B[ss]C[RIGHT White has no possibility left of making a second eye.]) (;B[rs]CR[rs] ;W[sq]CR[sq]C[White lives]) (;B[qq]CR[qq] ;W[ss]CR[ss] (;B[rs]CR[rs] ;W[sq]CR[sq]C[White lives.]) (;B[pr]CR[pr] ;W[sq]CR[sq])) (;B[pr]CR[pr] ;W[ss]CR[ss] (;B[rs]CR[rs] ;W[sq]CR[sq]C[White lives.]) (;B[qq]CR[qq] ;W[sq]CR[sq])) (;B[sq]CR[sq] ;W[ss]CR[ss]C[White has two eyes.])) (;B[rr] ;W[sr] (;B[ss] ;W[rs]) (;B[rs] ;W[ss]) (;B[qq]CR[qq] ;W[rs]CR[rs]C[White has three eyes (and in fact that last move was not even necessary to live)])) (;B[ss] ;W[sr] (;B[rs] ;W[rr]) (;B[qq] ;W[rs]) (;B[rr]CR[rr] ;W[rs]CR[rs])) (;B[rs] ;W[sr]) (;B[qq] ;W[sr]) (;B[pr] ;W[sr]))