It beats ante eight 9 times out of 15 attempts. I do consider 60% winning chance very good for a first time player.

The average is only 19.3 rounds because there is a bugged run where Gemini beats round 6 but the game bugs out when it attempts to sell Invisible Joker (a valid move)[0]. That being said, Gemini made a big mistake in round 6 that would have costed it the run at higher difficulty.

[0]: given the existence of bugs like this, perhaps all the LLMs' performances are underestimated.