(;AB[aq]AB[br]AB[cq]AB[bp]AB[gq]AB[gp]AB[hp]AB[hr]AB[iq]AB[jr]AB[is]AW[er]AW[eq]AW[ep]AW[fo]AW[fn]AW[cp]AW[co]AW[bo]AW[bn]AW[hn]AW[in]AW[ip]AW[jp]AW[jq]AW[kr]AW[lq]LB[dn:T]C[White to move. Play T to tenuki if neither black group can be killed.]AB[ap]AP[goproblems] (;W[dn]C[White had something here.]) (;W[dq];B[cr]C[Black lives.]) (;W[fq];B[gr]C[Black is alive.]) (;W[cr];B[dr] (;W[cs];B[bs] (;W[ds];B[es]C[Not the right move.]) (;W[es];B[gs];W[ds]C[Good.RIGHT]) (;W[fs];B[gr]C[Black is all right now.]) (;W[gs];B[gr]C[And Black lives.]) (;W[gr];B[fr] (;W[ds];B[es]C[???]) (;W[dq];B[ds]C[A mistake.]) (;W[fq];B[gs]C[White has failed.]) (;W[es];B[gs];W[ds]C[The killing move, great!RIGHT]) (;W[fs];B[gs]C[Black has saved both groups.]) (;W[gs];B[es] (;W[fq];B[hs]C[Wrong.]) (;W[dq];B[ds]C[:(]))) (;W[fr];B[gr]C[Not the right move.])) (;W[ds];B[cs]C[Black is happy to have secured both groups.]) (;W[es];B[gs] (;W[dq];B[cs]C[Black lives on.]) (;W[cs]C[Black died!RIGHT]) (;W[ds];B[cs]C[Not good enough, sorry.])) (;W[fr];B[gr]C[This didn't accomplish anything.]) (;W[gr];B[fr] (;W[cs];B[es]C[Black will have a ko now...]) (;W[ds];B[cs]C[Black lives.]) (;W[es];B[gs] (;W[cs]C[Yes!RIGHT]) (;W[dq];B[cs]C[Incorrect.]) (;W[ds];B[cs]C[Black is secure now.])) (;W[fs];B[gs]C[Not quite right.]) (;W[gs];B[fs] (;W[cs];B[bs] (;W[dq];B[es]C[Black will have a ko, more than he deserves.]) (;W[fq];B[hs]C[White has missed his opportunity.]) (;W[ds];B[es]C[A catastrophe.]) (;W[es];B[hs];W[ds]C[Yes, this is it!RIGHT])) (;W[ds];B[cs]C[Wrong.]) (;W[es];B[hs] (;W[cs]C[You did it!RIGHT]) (;W[ds];B[cs]C[Won't work here.]) (;W[dq];B[cs]C[:(])) (;W[fq];B[hs]C[Not the best move.]) (;W[dq];B[cs]C[Pity.]))) (;W[fs];B[gs]C[White won't kill now.]) (;W[gs];B[gr]C[Black lives on both sides.])) (;W[dr];B[cr]C[Black is safe now.]) (;W[fr];B[gr]C[Black group is now alive.]) (;W[gr];B[fr] (;W[es];B[gs] (;W[cr];B[dr] (;W[bs];B[cs]C[Not the right answer.]) (;W[cs]C[Good work.RIGHT]) (;W[ds];B[cs]C[Black group has slipped through your fingers.])) (;W[dr];B[cr]C[Black lives.]) (;W[cs]C[Black dies.RIGHT]) (;W[ds];B[cr]C[Wrong...]) (;W[dq];B[cr]C[Bad move.])) (;W[fs];B[gs]C[Black is now secure.]) (;W[gs];B[fs] (;W[fq];B[hs]C[And Black is happy.]) (;W[es];B[hs] (;W[dq];B[cr]C[Bad idea.]) (;W[cr];B[dr] (;W[cs]C[This works.RIGHT]) (;W[ds];B[cs]C[This doesn't work.])) (;W[dr];B[cr]C[Sorry.]) (;W[cs]C[Black group has been killed.RIGHT]) (;W[ds];B[cr]C[This is not good.]))) (;W[cr];B[dr] (;W[cs];B[bs] (;W[ds];B[es]C[Utterly unsatisfactory for White.]) (;W[dq];B[ds]C[Wrong, sorry.]) (;W[es];B[gs];W[ds]C[Good!RIGHT]) (;W[fs];B[gs]C[A costly mistake for White.]) (;W[fq];B[gs]C[White made a mistake.]) (;W[gs];B[fs] (;W[fq];B[hs]C[Victory has slipped away.]) (;W[dq];B[ds]C[Not right.]) (;W[ds];B[es]C[This is a disaster!]) (;W[es];B[hs];W[ds]C[Perfect!RIGHT]))) (;W[ds];B[cs]C[And Black is happy to live with both groups.]) (;W[es];B[gs] (;W[ds];B[cs]C[The prey has escaped.]) (;W[dq];B[cs]C[This won't work.]) (;W[cs]C[Bang! Black group is dead!RIGHT])) (;W[fs];B[gs]C[White has no prospects left.]) (;W[gs];B[fs] (;W[fq];B[hs]C[Big mistake.]) (;W[cs];B[bs] (;W[dq];B[ds]C[Bad move.]) (;W[ds];B[es]C[A disaster!]) (;W[es];B[hs];W[ds]C[Yes!RIGHT])) (;W[ds];B[cs]C[What now?...]) (;W[es];B[hs] (;W[dq];B[cs]C[White lost this fight.]) (;W[cs]C[Bingo!]) (;W[ds];B[cs]C[Eh, no.])))) (;W[dr];B[cr]C[White won't kill now.]) (;W[cs];B[cr] (;W[bs];B[ds] (;W[dr];B[as]C[Sadly, this doesn't kill.]) (;W[es];B[fs]C[Black has to choose which group to defend. Good!RIGHT]) (;W[fs];B[gs]C[Black lives with both groups.]) (;W[gs];B[fs] (;W[dr];B[as]C[White doesn't have much here now.]) (;W[es];B[hs]C[And Black had to choose the group he wanted to live with. Great work! RIGHT];W[dr]C[Good.RIGHT]))) (;W[dr];B[bs]C[Black lives with both groups.]) (;W[ds];B[bs]C[Wrongo.]) (;W[es];B[fs];W[bs]C[Black is dead, yay!RIGHT]) (;W[fs];B[gs]C[Didn't help much...]) (;W[gs];B[fs] (;W[fq];B[hs]C[Black is safe.]) (;W[bs];B[ds] (;W[dr];B[as]C[White has lost the battle.]) (;W[es];B[hs]C[Black can't protect both groups. Good!RIGHT];W[dr]C[Good.RIGHT])) (;W[dr];B[bs]C[Incorrect play.]) (;W[ds];B[bs]C[Whoops.]) (;W[es];B[hs];W[bs]C[Black dies!RIGHT]))) (;W[ds];B[cr]C[Missed the right move.])) (;W[bs];B[cs]C[Black has two eyes.]) (;W[cs];B[cr] (;W[bs];B[ds] (;W[dr];B[as]C[Oops.]) (;W[es];B[gs];W[dr]C[Yeah.RIGHT]) (;W[fr];B[gr]C[Bad move.]) (;W[gr];B[fr] (;W[dr];B[as]C[Black now lives with both groups.]) (;W[es];B[gs];W[dr]C[Yes!RIGHT]) (;W[fs];B[gs]C[No no.]) (;W[gs];B[fs] (;W[fq];B[hs]C[Ouch.]) (;W[es];B[hs];W[dr]C[Good.RIGHT]) (;W[dr];B[as]C[:(]))) (;W[gs];B[gr]C[:(]) (;W[fs];B[gs]C[Bad move for white.])) (;W[dr];B[bs]C[Black won this battle.]) (;W[ds];B[bs]C[Black is secure.]) (;W[es];B[gs];W[bs]C[Correct!RIGHT]) (;W[fr];B[gr]C[Black lives with both groups.]) (;W[fs];B[gs]C[Black is safe.]) (;W[gr];B[fr] (;W[es];B[gs];W[bs]C[Good job.RIGHT]) (;W[fs];B[gs]C[White has failed.]) (;W[gs];B[fs] (;W[fq];B[hs]C[Incorrect.]) (;W[es];B[hs];W[bs]C[Great!RIGHT]) (;W[ds];B[bs]C[Bad move, sorry.]) (;W[dr];B[bs]C[Black is secure.]) (;W[bs];B[ds] (;W[dr];B[as]C[Wrong, sorry.]) (;W[es];B[hs];W[dr]C[Correct.RIGHT]))) (;W[ds];B[bs]C[Black is safe.]) (;W[dr];B[bs]C[Black lives.])) (;W[gs];B[gr]C[Black is alive.])) (;W[ds];B[cr]C[This move doesn't work.]) (;W[es];B[gr] (;W[dq];B[cr]C[Wasted opportunity.]) (;W[cr];B[dr] (;W[dq];B[cs]C[Uh oh.]) (;W[cs]C[Correct.RIGHT]) (;W[ds];B[cs]C[Not the right answer.])) (;W[dr];B[cr]C[Incorrect line of play.]) (;W[bs];B[cs]C[Didn't qute work.]) (;W[cs]C[Nice job.RIGHT]) (;W[ds];B[cr]C[Black has defended his group.])) (;W[fs];B[gr]C[This move doesn't take away the second eye from Black.]) (;W[gs];B[gr]C[White can't kill now.]) (;W[hs];B[gs]C[This was a thank-you move.]) (;W[as];B[cr]C[White can't prevent two eyes now.]) (;W[ar];B[cr]C[Black is alive and well.]) (;W[ks];B[gs]C[Black has two eyes in the H column.]))