If this market goes below 81% and thus touches 80% even if it is for a short moment, this market will resolve to yes. Otherwise if market stays above 81% or equal to 81% it resolve to no.

Will be resolved after a month to no when 80% doesn't get traded or if it does then will be resolved faster.

The first 5 minutes of this markets life won't count, since all markets start at 50% that would not be fair otherwise.