Wow, very, very, very hard game had to reload an old save (1500 AD) and redo my tactics against charly with 20 cities and his vassal - monty with 8+ cities and teching like CRAZY.
I learned three important lessons during this game:
1) Tanks aren't THAT great against infantry/sam/anti tanks/airships/artillery/cavalry
2) In order to be successful with rush-buying stuff, you really need AT LEAST 2k gpt (my 500gpt and no kremlin didn't produce nearly as many troops as I needed)
3) Slavery is awesome, even late game, and the combination of draft/whip/purchase is very good
On the failed attempt I teched tanks but never managed to produce enough of them to be able to get an edge against charly (tried rush buying with only 500g surplus).
Reloaded an old save (1500 AD) and redid my catchup tech phase to include infantry/artillery/gunships and had much better success with whip/purchase/draft. Charly when I attacked had tons of cavalry/machine guns and infantry available and shortly after got artillery (my 100 infantry and 40 artillery managed to get a power score of 0.5 against him).
Super fun game and map. I had many epic battles against charly. Really hate the non stone/marble/copper though. Couldn't really abuse any fun tactics to get economy going
Some important dates and stuff in my game:
Charly was tech leader entire game closely followed by spain. Spain peace vassaled to charly and broke free a couple of times during game. Buddhism was a lovefest between me, spain, charly, and shaka.
~1AD joined war against stalin [buddhism war for easy diplo points] and produced some elepults and managed to grab 4 great cities (Moscow, oh what a GP farm).
~1100AD landed lib and got MT and cuirs which I used to destroy justinian (traded horse from shaka for a monsterous sum, justinian also had cuirs, pike and war elephants which made the war pretty slow)
~1550AD had some cavalry and cuirs (20/50) and declared on shaka in order to secure horses and happy resourcs, also he was way behind in tech and I needed more cities to have a chance against charly and monty.
~1650AD 3 golden ages later I had infantry and artillery and started whipping, drafting and purchasing like a mad man.
~1670AD declared on charly, managed to get spain to join in
-1886AD after a slugfest charly capitulated to me and that was sufficent to get a domination victory