1525AD: We continue to pop up infantry - most of our cities are empty! We have a tremendous army of 23 infantry and 16 cavs - including 12 in armies
I'll tell you how many units Sumeria has:
133 cavs, 330 infantry, 41 artillery, 10 transports, 8 carriers, 42 destroyers, 6 battleships, 36 fighters, 30 bombers, 76 guerilla, and a bunch of other units. He has twice our landmass and almost 4 times of population.
What, Germany gets ironclads?
Hey, don't you research uesless techs!
I sell Electronics to Germany for ironclad+WM+20g+60gpt - yes I know it's usually not worth, but I want those guys research something for me, such as Radio. I sell Electronics to Rome for 16gpt+30g.
1530AD: Sumeria has Radio. Yeah, exactly 4 turns. He has one tech to go for Modern Ages.
I sell ironclad to Rome for almost nothing to avoid him researching useless tech.
I give Maya Electronics for the same reason.
1535AD: We get Flight. Oh shoot, Germany has Flight at the same time! Set research to Radio due in 9.
1540AD: IBT Pentagon is completed.
1550AD: Sumeria apparently entered Modern Ages.
1555AD: Germany has Mass Production. Nice! I don't have anything to trade, though. Rome also gets Flight.
IBT: Oh shoot, Copan desposes again. I've lost it three times. Anyway, the age of saltpeter has ended. So let it be.
What, both Quiriguo and Dijon despose too? Fine, these cities don't matter anyway, and it may be good to let Maya be stronger.
1565AD: One Sumerian transport/destroyer pair appears, I wonder what he is up to..
I sign RoP with Maya for his 2gpt.
IBT:
Sumeria sneak attacks us from the sea. Man I hate this. Those AIs really like to pick on me! and we lost two lux.
1570AD: I sign alliance with Maya for Flight. After I get radio I'll do so with Rome and Germany too, but that's two turns away and I'm afraid Sumeria will have alreayd bought them first.
IBT: Not surprisingly, Germany signs alliance with Sumeria. But fortunately not Rome..
Bombers on Naissus and Nicomdia. Mayan cavs kill all landed Sumerian troops. Nice job! About 25 German cavs enter my territory and capture 4 workers. Welcome, just 25 cavs? 4 for each army..
the north
the south
1575AD: 4 armies kill 16 cavs, simple math.
IBT: Flak shoots down a bomber.
1580AD: Radio is done. However, the bad thing is I cannot trade with Germany. Finish off the rest of Germany cavs. I shut off research so I can trade after making peace with Germany, and save money to steal tech from Sumeria.
Sumeria is building SETI.
1590AD: Rome has Mass Production, but it asks Radio+1280g, hmm? I thought Radio is more expensive. Fine.
Motorized Transportation in 5 turns. Try to plant a spy in Germany but failed. Try an immediate steal on Sumeria, succeeded! Pick Motorized Trabsportation. We enter Modern Ages! Our free tech is computers.
I sell Motorized Transportation back to Rome for 1280g to get my money back.
I sell Mass Production to Maya for WM+32g+8gpt+Embargo against Sumeria.
Sumeria has now 305 Mech Infantry.
13 cruisers, 26 TOW, 1 Mobile SAM, only 1 tank. This means he has Rocketry on me. Good, at least we are not THAT behind.
I start research labs everywhere. Set sci to Fission due in 14 turns. Diplo win doesn't seem to be possible, though, since everyone is furious with me. But in case we have no other choice, we may have to try, plus Sumeria may get the vote.
IBT: Rome and Sumeria sign alliance against Maya. Massive bombardment from Sumeria again, we shoot down 5 bombers. Sumeria completes SETI. 5 german infantry enter my territory.
1595AD: with completion of 3 research labs, Fission is due in 12, 4 more due next turn. 2 armies kill the 5 infantry.
IBT: Sumeria is building UN and Manhattan.
1600AD: Now Fission is due in 9 turns. Kill 5 German cavs and 2 infantry.
One thing is not good: Sumeria now has 105192 culture, close to 130K.
IBT: Rome and Germany sign embarge against us. Germany and Rome sign alliance against Maya.
1605AD: This turn Sumeria's culture is 106357. That's 1165 per turn. This means at most 21 turns for a culture victory.
OK, the answer is simple, so diplo is the only choice now. Sumeria is building UN in Carthage, which is far away from its core and only pop 12. I start Palace build in Adrianople due in 8 and Fission is also due in 8. I should build the UN after 12 turns.