Civilization – Do I need to be influential with the human teammate to win Tourism Victory

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I'm playing a game with a friend where I'm doing my best to stack tourism. I've noticed that I'm still "exotic" to him and he has a TON of culture. I also cannot generate many tourism bonuses for him because "open borders" does not exist.

Do I have to become influential with my human ally (teammate) to win a culture/tourism victory? (more tourism than his total culture)

I cannot find the information on this anywhere.

Best Answer

First, I have no idea. But after firing up a test game with me and an AI in a team (with 4 other AI players) the evidence seems to indicate you do need to influence your teammate.

First, the victory screen shows my teammate as one of the 'targets' in the cultural victory progress:
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Second, the culture overview screen for victory indicates I'm influential with 0 of 5 other civilisations, implying I need to influence my teammate as there's only 4 other players.
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I'm not claiming this is a definitive answer, but until we've some strong evidence (someone winning or not when all players except their teammate are influenced) this is probably the best we've got.