(;AB[co]AB[ep]AB[er]AB[ds]AB[bs]AB[eq]AB[bo]AW[br]AW[dr]AW[cq]AW[bp]AW[aq]AW[dq]AW[cp]AP[goproblems] (;W[cs]C[];B[cr];W[as];B[ar]C[Life in double ko! If black forces a ko threat and then takes, white can take the other ko. Thus, white can never lose this ko =)RIGHT]) (;W[cr];B[cs]C[If white plays A1, black can play E1; white's dead like this.]) (;W[as];B[cs]C[Instead of making a ko, black connects and disables the possibility of a white eye at C2; white is also dead here (see the solution path if white plays C2)]))