(;AB[ba]AB[bb]AB[ab]AB[cc]AB[dc]AB[ec]AB[fc]AB[gc]AB[hc]AB[ic]AB[ia]AB[ib]AB[cd]AB[ce]AB[cf]AB[cg]AB[ch]AB[ci]AB[bi]AB[ai]AW[cb]AW[db]AW[eb]AW[fb]AW[gb]AW[hb]AW[ha]AW[ah]AW[bh]AW[bg]AW[bf]AW[be]AW[bd]AW[bc]AB[ea]AB[fa]AB[ga]AB[ag]AB[af]AB[ae]C[Black wants to play here. How many of white's strings can black kill?FORCE]LB[fh:Black is dead]MA[bc]MA[bd]MA[be]MA[bf]MA[bg]MA[bh]MA[ah]MA[cb]MA[db]MA[eb]MA[fb]MA[gb]MA[hb]MA[ha]LB[fe:Both]LB[ff:Only one]LB[fg:Neither - it's a seki]AP[goproblems] (;B[fe];W[ge]C[Please show. In a symmetrical position, please play on the left side.] (;B[ad];W[ac] (;B[ae];W[da]C[Black dies]) (;B[ca];W[da]C[Black dies]) (;B[da];W[ca]C[Black dies]) (;B[af];W[da]C[Black dies])) (;B[ac] (;W[ad] (;B[da];W[ca]C[Black dies]) (;B[af];W[da] (;B[fa];W[ca]C[Black dies]) (;B[ae];W[fa];B[ag]C[White has one live group.However, there is no rush to play this - if White plays first, Black can kill - see the 'seki' branch. So, best to leave this until the end...])) (;B[ca];W[da]C[Black dies])) (;W[da] (;B[ad];W[fa]C[White has one living group. However, there is no rush to play this - if White plays first, Black can kill - see the 'seki' branch. So, best to leave this until the end...]) (;B[fa];W[ad] (;B[af];W[ca]C[Black dies]) (;B[ea];W[af]C[White lives with points and in seki. Black can do better.])))) (;B[da]C[NOTTHIS]) (;B[ca]C[NOTTHIS])) (;B[ff];W[gf]C[Please show. In a symmetrical position, please play on the left side.] (;B[ad];W[ac] (;B[ae];W[da]C[Black dies]) (;B[ca];W[da]C[Black dies]) (;B[da];W[ca]C[Black dies]) (;B[af];W[da]C[Black dies])) (;B[ac] (;W[ad]C[CHOICE] (;B[da];W[ca]C[Black dies]) (;B[af];W[da] (;B[fa];W[ca]C[Black dies]) (;B[ae];W[fa]C[Black can tenuki now, leaving white with one living group. Well done. However, there is no rush to play this - if White plays first, Black can kill - see the 'seki' branch or problem 16446. So, best to leave this until the end...RIGHT]) (;B[ag];W[fa]C[Black can tenuki now, leaving white with one living group. Well done. However, there is no rush to play this - if White plays first, Black can kill - see the 'seki' branch or problem 16446. So, best to leave this until the end...RIGHT])) (;B[ca];W[da]C[Black dies])) (;W[da] (;B[ad];W[fa]C[White has one living group - this is correct. However, there is no rush to play this - if White plays first, Black can kill - see the 'seki' branch or problem 16446. So, best to leave this until the end...RIGHT]) (;B[fa];W[ad] (;B[af];W[ca]C[Black dies]) (;B[ea];W[af]C[White lives with points and in seki. Black can do better.])))) (;B[da]C[NOTTHIS]) (;B[ca]C[NOTTHIS])) (;B[fg];W[ad]C[If it is a seki, white should not want to play either... if he does play, what do you do as black?] (;B[da];W[ca] (;B[ea];W[ac]C[Black dies - black can do a lot better.]) (;B[fa];W[ac]C[Black dies - black can do a lot better.]) (;B[af];W[ac]C[Black dies - black can do a lot better.]) (;B[ac];W[aa]C[Black dies - black can do a lot better.])) (;B[af] (;W[da] (;B[ag];W[fa]C[White lives - black can do a lot better.]) (;B[fa];W[ac] (;B[ea]C[White dies. White should leave the original position as it is.]) (;B[ga]C[White dies. White should leave the original position as it is.]) (;B[ae]C[CHOICE])) (;B[ae];W[fa]C[White lives - black can do a lot better.])) (;W[ac] (;B[ae];W[da] (;B[fa]C[White dies. White should leave the original position as it is.CHOICE]) (;B[ag];W[fa]C[White lives - black can do a lot better.])) (;B[ca];W[da]C[Black dies - black can do a lot better.]) (;B[da];W[ca]C[Black dies]) (;B[ag];W[da] (;B[fa]C[White dies. White should leave the original position as it is.CHOICE]) (;B[ae];W[fa]C[White lives - black can do a lot better.])))) (;B[ca];W[da] (;B[fa];W[ac]C[Black dies - black can do a lot better.]) (;B[af];W[ac]C[Black dies - black can do a lot better.]) (;B[ac];W[aa]C[Black dies - black can do a lot better.]))) (;B[fh]C[No, black can live with points]))