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GMT +05:30 here. I'm generally free after midnight so we could have our battle between 12 am and 1 am (between 7:30 pm and 8:30 pm for you). Lemme know if this is okay and we could decide the day.
On second thought, midnight sounds like a rather unreliable time for me, so how about we have our battle on monday between 8 pm and 10 pm (3:30 pm and 5:30 pm for you) ?
I just remembered that I can't do Monday because I'm away that day. Would something like 6pm my time on Tuesday be ok for you? I'm working until 5 most days.