Sadaharu: Also if we accept double-ko then there will be more answers. Not sure whether we should do that or just mention that double-ko is an inferior answer. @Joschka
theob: Hi, after f1g1e1a3 white can a2 which is gote seki for black ?
the solution is inferior to f1g1a3 double ko which is the only acceptable solution and not the gote seki ?
Sadaharu: Yes that variation leads to seki but that's because the response was incorrect. Changed the variation so that it will end up in a ko which is wrong
Double Ko is not unconditional and therefore inferior.