Book in 3A of Rajdhani immediately, and try for Tatkal later. At least you'll have a backup of some sorts
You'll have a better chance in Rajdhani (Five 2A, Eleven 3A) than Sampoorna Kranti (Two 2A, Six 3A) that's for sure.
Baaki ka it's nearby Diwali so I won't be sure.
I have a ticket in Mumbai Central New Delhi AC Duronto on...
more... 1st in 2A. While booking on 21st it was in RAC 10, right now it's still in RAC 10 ЁЯШВ