Peek, ENHC, and OBO

The dealer-blackjack question

When the dealer shows an ace or a ten, the dealer may already hold a natural. What the table does about that possibility — before you commit split or double money — is the dealer-blackjack protocol, and it changes both the flow of the round and the correct strategy.

Three separate ideas are involved, and collapsing them into “does the dealer peek?” loses information: when the dealer’s second card exists, whether and when the dealer checks it, and what happens to your added wagers if a blackjack is discovered after you acted.

American peek

In the standard American game the dealer receives the hole card immediately and, showing an ace or a ten, checks it for blackjack before you act. If the dealer has a natural the round ends at once; if not, you play with a guarantee: no double or split you make can be lost to a dealer blackjack.

That guarantee keeps added wagers from being exposed to a dealer natural. For example, under this trainer’s 6D H17 rules, 11 doubles against an ace and 8,8 splits against a ten. All three playable profiles use the peek protocol, although H17/S17 and surrender still move individual cells.

Your hand

66six of spades, card 1

55five of diamonds, card 2

Dealer shows

AAace of spades, card 1

European no-hole-card (ENHC)

In a European no-hole-card game the dealer takes only one card and receives the second after all players have finished. You must double and split without knowing whether a dealer blackjack is waiting — and under full ENHC settlement, if it is, every wager on the table is lost, including the added split and double bets.

The correct response is often to commit less extra money against aces and tens: some doubles and splits from a peek chart become hits or stands under full ENHC settlement. The protocol does not change hands against 2 through 9, because a dealer natural cannot begin with those upcards.

Original-bet-only (OBO)

OBO sits between the two. The round flows like a no-hole-card game, but if the dealer turns out to have a natural, added split and double wagers are returned and only the original wager is lost. Because the extra money is protected, the strategy largely follows the American chart — the protocol changes settlement, not the risk you price in.

Some rule sets check under an ace but not under a ten. If the settlement rule exposes added wagers against the unchecked ten, use the corresponding no-hole-card strategy for those cells; against the checked ace, use peek strategy. This is why the rules model tracks the check and settlement separately.

What this trainer supports

The launch product is peek-only: every verified practice profile deals the hole card immediately and checks ace and ten before you act. The rules catalog includes ENHC and OBO presets as reference profiles so you can see the full model, but they are marked as pending strategy verification and are not selectable for practice until their charts are verified.