1st round) Your Kushina have to hit Minato, when she does use her Mystery on Minato and then your Main mystery on Minato

2nd round) MOST IMPORTANT! When Hashirama use his mystery use shisui on Kyuubi if he remove your chakra restart round!

2nd round) If Hashirama doesnt take your chakra then wait for him to attack your Kushina and then use Kushina on Kyuubi and instantly use Shisui on Kyuubi and then Madara on Hashirama

And in this case you are already winner only Sasuke,Madara left and maybe Hashirama with low hp.