Forum:Final Countdown vs card effect

During a duel a player activated 'Final Countdown' and began the countdown to their victory. However their lifepoints were reduced to 300 in the final count (19 going to 20) turn. This was during their opponents’ turn who had 'Solar Flare Dragon' on their side of the field. During the end phase of their turn, both effects were resolved, 'Solar Flare Dragons card effect reduced the other player's lifepoints to zero, while 'Final Countdowns effect also resolved at the same time. (The end phase)

The questions is, is it a win for the 'Solar Flare Dragon' player because they had turn priority and their effect resolved first? (Default 0 lifepoint win)

Is it a win for the 'Final Countdown' player because the card resolved it's effect? (Special card effect win)

Or is it a draw because both effects resolved at the same time regardless for the player's turn? (Similar to the double ‘Final Countdown’ ruling: Both players activate final countdown, one player uses ‘Pyro clock of destiny’ to forward their turn count by 1 resulting in a double final countdown draw)

A swift answer to a petty dispute between friends would be much appreciated.

Thank you,

Loyal yu-gi-oh fans