With the numbers from
https://www.888casino.com/blog/edge-...the-known-card ...
You know that one of the first two cards is a 9, but not which one. You bet on player.
- If the card is first out, it goes to player and you have a 21.528% advantage. This happens 50% of the time.
- If the card is second out, it goes to banker and you have a 20.641% disadvantage. This also happens 50% of the time.
So your expectation is 0.5 x 21.528% - 0.5 x 20.641% = 0.4435%
Furthermore, since banker and player each get two of the first 4 cards, you have the same advantage even if you only know that one of the first 4 cards is a 9 (left as an exercise). Also left as an exercise, do you still have an advantage if you only know that one of the first 5 cards is a 9? How about one of the first 6 cards?
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