Fun question

Let's say you mysteriously acquired some magic powers, and you are now able to see the topmost card in the deck during your turn (and your turn only), but are still unable to see the dealer's hole card.

What would be the player's edge % with this unfair advantage?

I don't think this is what you are looking for, but after 20 minutes of searching this is the closest thing i could find.

https://www.blackjackincolor.com/cardcountingextra4.htm

Quote: Palladium

Let's say you mysteriously acquired some magic powers, and you are now able to see the topmost card in the deck during your turn (and your turn only), but are still unable to see the dealer's hole card.

What would be the player's edge % with this unfair advantage?

First you have to sit at first base for it to make the biggest difference. Then you can change your bet based on the card. Otherwise it only helps you decide to take your third card or stand.
Why would you think that is an unfair advantage?

Quote: billryan

First you have to sit at first base for it to make the biggest difference. Then you can change your bet based on the card. Otherwise it only helps you decide to take your third card or stand.
Why would you think that is an unfair advantage?

Because you have information no one else does and it breaks the game.

Wouldn't the edge be better served at Baccarat with this power

Phil Ivey made millions being able to detect what the topmost card was

Quote: Palladium

Let's say you mysteriously acquired some magic powers, and you are now able to see the topmost card in the deck during your turn (and your turn only), but are still unable to see the dealer's hole card.

What would be the player's edge % with this unfair advantage?

To clarify, does the magic player know the top card before placing their initial bet (hence requiring them to sit at first base to take action on the information), only the top card after receiving their initial two cards (so they could sit at third base and also count the other player's cards), or both?

Quote: TigerWu

Because you have information no one else does and it breaks the game.

Is holecarding an unfair advantage?

Quote: billryan

Is holecarding an unfair advantage?

The house edge is an unfair advantage.

If I’m holecarding, I’m just fighting one unfair advantage with another.

Quote: billryan

Is holecarding an unfair advantage?

Yes.

Quote: TigerWu

Yes.

Completely disagree.

The term the OP is referring to here is Next Carding. Sometimes agents for a casino can deal from a shoe in a way when they pull the card protector on the front of the shoe up they can see the next card, then grab the 2nd card and slide it out and deal that instead.

Example of a dealer that for "whatever" reason hates you: You have 14, you hit, the dealer pulls up the card and peeks at the 2nd card being a face card, pulls that card instead of the first card and busts you.

I believe the Wiz has a thread in these very blackjack subforums about Next Carding. Try searching for that. Don't quote me on it, but I think he said it was a little under 10% edge for whatever side was able to do this.