# TGL Euchre

> Partner Up. Outsmart Them. Take Every Trick. A free, no-install,
> browser-based Euchre. Solo vs three deterministic AI partners and
> opponents. Bowers, going alone, marches, euchres — full 24-card-deck
> Midwestern Euchre, deterministic and replay-validated. No luck — just
> skill and strategy.

Site: https://tglgames.com/
Play: https://tglgames.com/euchre/
About: https://tglgames.com/euchre/about/
Design doc: https://tglgames.com/docs/euchre.md

## What it is

Euchre is a 4-player partnership trick-taking card game popular in the
American Midwest. You sit at the South seat. **North is your partner.
East and West are AI opponents.** 24-card deck (9, 10, J, Q, K, A of
each suit), 5-card hand, top of the leftover stack flipped face up as
the "up-card."

The point of the game is to take **tricks** — one round of four cards
each, highest takes them all. Win 5 tricks per hand. Whoever wins the
most tricks scores points. **First team to 10 points wins one game.**
A run is up to 5 games; your leaderboard score is your team's total
points across the run.

## What makes Euchre interesting

1. **Bidding for trump** — one suit becomes "trump" each hand, chosen
   in two bidding rounds.
2. **Bowers** — the J of trump (right bower) is the highest card in
   the deck; the J of the same color (left bower) is second-highest
   and counts as trump.
3. **Going alone** — your partner sits out the hand for a higher-payout
   3-vs-1 attempt.
4. **Euchres** — failing to win 3 tricks after calling trump gives the
   defenders 2 points instead.

## Bidding

- **Round 1, "Order it up"**: each player in turn passes or orders the
  up-card's suit as trump. If anyone orders, the dealer picks up the
  up-card and discards one. The orderer (caller) and their partner are
  on the line for at least 3 tricks.
- **Round 2, "Call any other suit"**: if all four pass round 1, the
  up-card flips down and players can name any suit except the rejected
  one.
- **All-pass round 2**: redeal (no "stick the dealer" in this version).
- The caller may declare **alone** at bid time. Their partner sits out
  the entire hand face-down.

## Trump ranking (when ♠ is trump)

```
J♠ (right bower)  >  J♣ (left bower)  >  A♠  >  K♠  >  Q♠  >  10♠  >  9♠
```

Off-suit cards rank A, K, Q, J, 10, 9 — except the J that became the
left bower is no longer in its original suit.

## Scoring per hand

| Caller's tricks | Alone | Points to                  |
|-----------------|-------|----------------------------|
| 5 (march)       | no    | 2 to caller's team         |
| 5 (march)       | yes   | 4 to caller's team         |
| 3 or 4          | (any) | 1 to caller's team         |
| 0, 1 or 2       | (any) | 2 to defenders ("euchre")  |

## End conditions (run-level)

- `cashout` — you stopped voluntarily between hands.
- `win` — your team hit 10 in a game.
- `loss` — opponent team hit 10 in a game.
- `max_games` — the run hit the 5-game cap.

Leaderboard score is total **points** scored by your team across the run
(NS team if you sit South), tie-broken by `duration_ms` ascending.

## Determinism + anti-cheat

- Mulberry32 PRNG, bit-identical between JS and PHP, drives the shuffle
  + every AI decision.
- Replay validator rebuilds the hand-by-hand state from `seed +
  player_actions + ai_version` and rejects any run whose score doesn't
  match the simulator's recomputation.
- AI version is recorded on the run so old replays still validate after
  AI tuning.

## Controls

- **Mouse / touch**: click a card in your hand to play it; click bid
  buttons (Order up / Pass / Alone) when prompted.
- **Keyboard**: number keys 1–5 select cards; Enter confirms; Esc
  passes. P = pause.

## Privacy / signup

- No account required. Guests get an auto-generated username; rename
  anytime.
- No tracking pixels, no analytics SDK, no third-party scripts.

## Genre / keywords

euchre, midwestern euchre, browser euchre, free online euchre, html5
euchre, partnership trick-taking, bowers, going alone, march, euchred,
mobile euchre, leaderboard, mgwalk, tglgames.com

## Author

mgwalk — https://tglgames.com/