IMHO, Multi-Player is a lot more fun, bigger bloodier wars, unpredictable human player all add another dimension of fun to the game. If you get into a group that likes to joke, it's even better. I don't know about other groups but my MP group tend to like to joke with each other a lot to make the game even more fun.
Now, many SP strategies transfer directly to MP, but, there is one strategy that is kinda unique to MP situation. This strategy is not applicable to single player unless AI changes.
Now, all of us want tech. In MP, it is possible for you to research all technologies before end of the game very quickly. Here is how.
First, recognize there are order, liberty, and equality national values. This strategy works best with 2 trading partners who are 1 liberty + 1 order and both are capable of researching technology within a year plus surplus RP.
Now, here is the situation
Country A - Liberty
Country B - Order
Liberty gives you bonus to research ind/com while order gives you bonus to research in army/navy. How do you utilize those bonuses? Here is an example.
Assume beginning of game both country A and country B start with the default 25 technologies (5 in each category).
Tech 1
Country A - Ind
country B - Army
Tech 2
Country A - Ind
Country B - Army
Tech 3
Country A - Ind
Country B - Army
Tech 4
Country A - Ind
Country B - Army
Now, for tech 5 & 6
Country A offer 2 Ind tech for 2 army tech from country B
result
Country A has -20 RP but 4 ind + 2 army tech now
Country B has 0 RP but 2 ind + 4 army tech now
trade again, this time, country B initiate it
resut
Country A has -20 RP but 4 ind + 4 army tech
Country B has -20 RP but 4 ind + 4 army tech
Now, how long does it take for both nations to research 8 technologies? The values are approximate as when I loaded up GC Sweden, I discover the time for Sweden's bonus tech (army/navy) was a little less than 11 months but I'll be generic)
Country A = 4 * 11 + 2 * 12 (to work off those -20 RP) = 68 months = 5 years 8 months. Not bad for 8 techs.
Country B = 4 * 11 + 2 * 12 (to work off those -20 RP) = 68 months = 5 years 8 months. Again, 8 techs in record short time.
If you research those tech yourself, it will be 4 * 11 + 4 * 12 = 7 years and 8 months. About 2 years longer.
When both nations are same value, advantage is less. When you factor in nations that are capable of producing surplus RP, thus speed up trading time, advantage of mutual tech trading increases even more.
This trading does depend on both parties understand it and trade whenever they have non negative RP. When you factor in the advantage of getting tech early (say muzzle load rifle, artillery, income boosting tech, or important ind tech), it's usually better for you to get those tech early and wait to work out that negative RP.
The most efficient way to trade is whenever both sides have 2 techs that the other side doesn't have, just trade 1 tech each at a time. This way, both partner will end up with -10 RP and 4 techs each within 2 years and 10 months (22 months from your 2 specialty tech, 12 months from -10 RP due to trading).
What if you're a tech poor nation with just 0.50 RP a month? You still benefit from this due to RP saved.
Now, be careful, when you do something like this, don't find a trading partner that may go against you...... Find someone that is not likely to turn against you and trade away as it is a win-win situation
If cuntry A specialize in ind tech and country B specialize in army tech. Assume both countries start with 5 army tech and 5 ind tech and there are no pre-requisite requirements for tech research, in order to get all 25 army and industrial tech, it takes 460 months, or 38 years and 4 months. If you start at 1836, you can get all those 50 techs by 1874. Imagine all the barrels you can produce from all of your factories by 1874 and send them to your neighbors to say hello
Of course, with invention trigger time, this may not be possible 
Now, many SP strategies transfer directly to MP, but, there is one strategy that is kinda unique to MP situation. This strategy is not applicable to single player unless AI changes.
Now, all of us want tech. In MP, it is possible for you to research all technologies before end of the game very quickly. Here is how.
First, recognize there are order, liberty, and equality national values. This strategy works best with 2 trading partners who are 1 liberty + 1 order and both are capable of researching technology within a year plus surplus RP.
Now, here is the situation
Country A - Liberty
Country B - Order
Liberty gives you bonus to research ind/com while order gives you bonus to research in army/navy. How do you utilize those bonuses? Here is an example.
Assume beginning of game both country A and country B start with the default 25 technologies (5 in each category).
Tech 1
Country A - Ind
country B - Army
Tech 2
Country A - Ind
Country B - Army
Tech 3
Country A - Ind
Country B - Army
Tech 4
Country A - Ind
Country B - Army
Now, for tech 5 & 6
Country A offer 2 Ind tech for 2 army tech from country B
result
Country A has -20 RP but 4 ind + 2 army tech now
Country B has 0 RP but 2 ind + 4 army tech now
trade again, this time, country B initiate it
resut
Country A has -20 RP but 4 ind + 4 army tech
Country B has -20 RP but 4 ind + 4 army tech
Now, how long does it take for both nations to research 8 technologies? The values are approximate as when I loaded up GC Sweden, I discover the time for Sweden's bonus tech (army/navy) was a little less than 11 months but I'll be generic)
Country A = 4 * 11 + 2 * 12 (to work off those -20 RP) = 68 months = 5 years 8 months. Not bad for 8 techs.
Country B = 4 * 11 + 2 * 12 (to work off those -20 RP) = 68 months = 5 years 8 months. Again, 8 techs in record short time.
If you research those tech yourself, it will be 4 * 11 + 4 * 12 = 7 years and 8 months. About 2 years longer.
When both nations are same value, advantage is less. When you factor in nations that are capable of producing surplus RP, thus speed up trading time, advantage of mutual tech trading increases even more.
This trading does depend on both parties understand it and trade whenever they have non negative RP. When you factor in the advantage of getting tech early (say muzzle load rifle, artillery, income boosting tech, or important ind tech), it's usually better for you to get those tech early and wait to work out that negative RP.
The most efficient way to trade is whenever both sides have 2 techs that the other side doesn't have, just trade 1 tech each at a time. This way, both partner will end up with -10 RP and 4 techs each within 2 years and 10 months (22 months from your 2 specialty tech, 12 months from -10 RP due to trading).
What if you're a tech poor nation with just 0.50 RP a month? You still benefit from this due to RP saved.
Now, be careful, when you do something like this, don't find a trading partner that may go against you...... Find someone that is not likely to turn against you and trade away as it is a win-win situation
If cuntry A specialize in ind tech and country B specialize in army tech. Assume both countries start with 5 army tech and 5 ind tech and there are no pre-requisite requirements for tech research, in order to get all 25 army and industrial tech, it takes 460 months, or 38 years and 4 months. If you start at 1836, you can get all those 50 techs by 1874. Imagine all the barrels you can produce from all of your factories by 1874 and send them to your neighbors to say hello
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