Japanese rules. In this position, you need to play only one ko threat, but please make sure it's the right one.....
(;SZ[7]AW[gb]AW[bc]AW[cc]AW[dc]AW[fc]AW[bd]AW[ed]AW[ce]AW[de]AW[fe]AW[cf]AW[ff]AW[fg]AB[bb]AB[cb]AB[db]AB[eb]AB[fb]AB[ac]AB[ad]AB[ae]AB[be]AB[bf]AB[df]AB[ef]AB[bg]AB[cg]C[White to play and draw! (Japanese rules)]GM[1]FF[4]CA[UTF-8]AP[CGoban:2]ST[2]RU[Japanese]KM[0.50]TM[]PL[W]
(;W[fa];B[ea];W[gc];B[ga]
(;W[ee]
(;B[dg];W[fa];B[ec];W[ga]C[White was able to draw the game RIGHT])
(;B[fa];W[dg]C[White wins by 3 ponts...!]))
(;W[dg];B[eg];W[fa];B[ec];W[ga]C[White has won the ko, but black wins the game - by 1 point! With his ko threat at d1 white gave black an extra prisoner....])
(;W[eg];B[dg];W[fa];B[ee]
(;W[ec];B[ga]C[Black will connect the ko and wins by 1point - the white ko threat at e1 made the black threat at e4 possible.])
(;W[ga];B[dd];W[cd];B[ec]C[White must answer the black ko threat!])))
(;W[ga];B[fa];W[gc]C[Black wins by 1 point])
(;W[ee]C[With this, white plays a ko threat before the ko even started!])
(;W[dg]C[With this, white plays a ko threat before the ko even started!There is one more at e3, so it seems still to be okay, but he also loses a point by sacrificing on a dame point - black will win by 1 point!]))