Why worry about diplomacy ai naval assaults rarely happen.
I think the slow teching is down to poor resources and map settings. Huge increases tech costs. Marathan tripples research costs? I think the issue here is the land.
Conquered land will have colonial costs that cripple you. Okay with police property?
If you don't have land to whip you need other solutions to build armies. Weak vassals do you no good if your cities run out of steam production wise. Cuirs rushes for me involve continual whipping of most cities with maybe one strong production unit pump. On these settings that should be OP compared to whipping?
I think the slow teching is down to poor resources and map settings. Huge increases tech costs. Marathan tripples research costs? I think the issue here is the land.
Conquered land will have colonial costs that cripple you. Okay with police property?
If you don't have land to whip you need other solutions to build armies. Weak vassals do you no good if your cities run out of steam production wise. Cuirs rushes for me involve continual whipping of most cities with maybe one strong production unit pump. On these settings that should be OP compared to whipping?

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! Completely incompatible with world king
- the grind of this size map had me a bit despondent but if I'm going to play this and maybe one other mara/huge map ever then I want to make it count 
. I will go vassals at some point but currently I don't think I'm big enough. Any vassal I take now is likely to be below average global power making future opponents harder to vassal whereas taking their cities is like shooting fish in a barrel. Ideally I would like to avoid going to war with 42 city Khmer - not like I wouldn't win but it would take ages. I hear you about the challenge but for me that was getting to this point and now I want to get over the line.
) so no massive rush for that and as you say have been enjoying the 50% hammers boost in capital to say nothing of the fact this is where majority of my beakers are located albeit it's not an amazing commerce spot.
due to river, +1
into a barracks even. Planned 3rd city to the west on wine hill for +1