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games: the hand that becomes two, and the bet that has to follow it

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Blackjack has a split. It was the last rule missing from a game that has been
live for a week, and it is the only move in blackjack that takes chips out of
your stack *after* the cards are out — which is most of what there is to get
wrong about it.

So the state stops pretending. State.Player is gone; there is a slice of Hands,
each with its own cards, its own bet, its own outcome and its own payout, and an
Active index the player works left to right. Settle runs per hand and rakes per
hand: netting them against each other first would mean a player who won one and
lost one paid no rake at all, which is not a rake, it's a discount for
splitting. The web layer takes the second bet before the move and hands it
straight back if the engine refuses — the same shape double already used, except
double was staking st.Bet, the whole table's stake, which was the same number as
the hand's until today and is now emphatically not. DoubleCost/SplitCost are the
active hand's, and the felt would have found this by charging you 300 to double
the third hand of a split.

The rules that cost money if you guess them: split aces get one card each and no
say (a pair of aces is otherwise the best hand in the game, forever), 21 on a
split hand is twenty-one and not a natural (it does not pay 3:2 — the test that
pins this is the most expensive one in the file), same rank rather than same
value (a king and a queen are not a pair), four hands maximum, double after
split allowed, and if every hand busts the dealer does not turn over.

A live hand outlives a deploy, so State.UnmarshalJSON still reads the old blobs:
"player" with no "hands" becomes one hand holding the whole stake. Without it, a
player mid-hand at restart is a player whose cards vanished — which is not a
decode error, and would not have looked like one.

On the felt a hand is now a box with its own spot, and a split is a card lifting
out of one hand into a new one with a second stack of chips flying after it from
your pile. Verified in a browser against a real pair: chips 4738 -> 4638 on the
split, two hands played out, one push and one loss, "Down on the deal. -100",
4738 back. Three hands stack without collision at 390px. Settled hands come back
to full brightness — dimming means "not your turn", and when the deal is over
they are the thing you are reading.

Claude-Session: https://claude.ai/code/session_013M5nD7PgUboJXoDcYHzpuJ
This commit is contained in:
prosolis
2026-07-14 13:54:55 -07:00
parent 7ca1f7a030
commit 6f34a89622
9 changed files with 1116 additions and 225 deletions
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32
internal/web/templates/blackjack.html
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@@ -51,21 +51,36 @@
<p data-verdict class="hidden rounded-full bg-white/95 px-5 py-2 font-display text-lg font-bold text-[#2b2118] shadow-pete"></p>
</div>
<!-- Player: the bet sits in front of the cards it's riding on. -->
<!-- Player: the bet sits in front of the cards it's riding on.
The hands themselves are built by blackjack.js, because how many there
are is a thing that changes mid-hand: you split, and one hand with one
bet on it becomes two hands with a bet each. The template below is the
shape of one of them; the row starts with exactly one, which is also
the spot you build your bet on before any cards exist. -->
<div>
<div class="mb-2 flex items-center gap-2">
<span class="text-xs font-bold uppercase tracking-wider text-white/60">You</span>
<span data-player-total class="hidden rounded-full bg-black/25 px-2.5 py-0.5 text-xs font-bold tabular-nums text-white"></span>
</div>
<div class="flex items-center gap-5">
<div class="bj-hands" data-hands data-count="1" aria-live="polite"></div>
</div>
<template data-hand-template>
<div class="bj-hand" data-hand data-live="1">
<div class="pete-spot" data-spot>
<span class="pete-spot-label">Bet</span>
<div class="pete-stack" data-stack></div>
<span data-spot-total class="pete-spot-total hidden"></span>
</div>
<div data-player class="pete-hand flex-1" aria-live="polite"></div>
<div class="min-w-0">
<div class="mb-1 flex h-5 items-center gap-1.5">
<span data-total class="hidden rounded-full bg-black/25 px-2.5 py-0.5 text-xs font-bold tabular-nums text-white"></span>
<span data-hand-outcome class="hidden rounded-full bg-white/90 px-2 py-0.5 text-[0.65rem] font-bold uppercase tracking-wide text-[#2b2118]"></span>
</div>
<div data-cards class="pete-hand"></div>
</div>
</div>
</div>
</template>
</div>
</section>
@@ -116,9 +131,14 @@
hover:bg-[color:var(--ink)]/5 active:translate-y-px disabled:opacity-40 disabled:pointer-events-none transition">
Double
</button>
<button type="button" data-move="split"
class="rounded-full bg-[color:var(--card)] px-8 py-3 font-display text-lg font-bold shadow-pete border-2 border-[color:var(--ink)]/10
hover:bg-[color:var(--ink)]/5 active:translate-y-px disabled:opacity-40 disabled:pointer-events-none transition">
Split
</button>
</div>
<p class="mt-3 text-center text-xs text-[color:var(--ink)]/40">
<kbd>h</kbd> hit · <kbd>s</kbd> stand · <kbd>d</kbd> double
<kbd>h</kbd> hit · <kbd>s</kbd> stand · <kbd>d</kbd> double · <kbd>p</kbd> split
</p>
</section>