(;SZ[9]AW[ef]AW[ff]AW[dg]AW[fg]AW[bh]AW[dh]AW[ci]AB[cf]AB[df]AB[eg]AB[eh]AB[di]AB[ei]TR[eg]TR[eh]TR[di]TR[ei]C[How can black could save the marked stone ?]GM[1]FF[4]CA[UTF-8]AP[CGoban:2]ST[2]RU[Japanese]KM[0.00]TM[]PW[none]PB[none] (;B[ch];W[cg] (;B[bg];W[ch] (;B[ah]C[Black survive and win the corner !RIGHT]) (;B[ag];W[fh]) (;B[af];W[fh]) (;B[bi];W[ai]) (;B[gh];W[fh]) (;B[fh];W[gh]) (;B[gi];W[fi];B[fh];W[gh]) (;B[fi];W[gi])) (;B[bf];W[bg]) (;B[bi];W[ai];B[bg];W[ch])) (;B[cg];W[ch]TR[dg]TR[bh]TR[ch]TR[dh]TR[ci]MA[eg]MA[eh]MA[di]MA[ei]C[White group have 3 liberties and your 2 so he win the capturing race.]) (;B[fh];W[gh]C[Black still die.]) (;B[fi];W[fh]C[black still die...]) (;B[bg];W[fh]TR[eg]TR[eh]TR[di]TR[ei]C[This way to kill is too slow and white can kill you before you kill him.CHOICE]) (;B[gi];W[fh];B[fi];W[gh]C[Black die...]) (;B[bi];W[ai]C[It doesn't change the situation]) (;B[gh];W[fh]C[White cut the connection.]) (;B[ai];W[fh]C[Black die...]) (;B[ah];W[fh]C[Black die...]) (;B[ag];W[fh]C[Black die...]))