Map positions use real latitude/longitude of each province centre — Europe, geographically accurate, not a cartoon redraw.

Tap a province to inspect it. Tap one of your units, then a highlighted neighbour, to set a Move order in one tap.

Your orders

Orders save automatically to this device (and to your profile when signed in). Unordered units Hold. Illegal orders are explained, not silently accepted — a Backstabbr pain point fixed here.

✅ Orders not checked yet — validation runs live as you type, and again before any turn can be submitted.

Import save

Turn log

Trophy cabinet 🏆

Trophies reward the habits that make Diplomacy great — showing up, giving clear orders, keeping (or breaking!) your word, trying new maps. Built on self-determination theory: autonomy (your maps, your personas), competence (hints, clean sheets), relatedness (press, pledges). No punishment streaks, no dark patterns — come back because it's fun. Full design notes: docs/GAMIFICATION_AND_GAME_THEORY.md.

Press — negotiate, in character 🎭

Write plainly, then optionally rewrite your message in your power's theatrical persona. It stays in English — just with the accent, idioms and swagger. Meaning, province names and numbers are never changed.

To Your power's persona

🤝 Make this a public pledge — a commitment device. Everyone will see it, and your word becomes a game piece (Schelling would approve).

Hints & AI Strategist

Rule-based hints always work offline. If you enable an OpenAI-compatible endpoint in Settings, Ask AI Strategist sends only the board position (units, centres, season — never your private press unless you paste it) and returns tailored advice.

New here? Diplomacy in 5 minutes

The goal. Europe, 1901. 7 Great Powers, 34 supply centres (★). Control 18 after a Fall turn and you win. There are no dice and no luck — only talk and timing.
Units. Armies move on land, Fleets on sea and coasts. Every unit has strength 1. You may have one unit per centre you own.
Each year: Spring moves → Fall moves → winter builds/disband. All orders are written in secret, then revealed and resolved at the same time.
Four orders. Hold — stay and defend. Move — go to a neighbouring province. Support — lend your strength to another unit's move or hold (you can support allies!). Convoy — a Fleet in a sea carries an Army across it.
Winning a fight. Strength = 1 + supports. Bigger strength wins; equal strength bounces and nobody moves. Support is cut if the supporter is attacked from somewhere else.
The real game is talk. Use Press. Promise, coordinate supports and convoys… and yes, occasionally backstab. Nothing is binding. That is the game.
First game tips. Grab neutral centres near you in 1901 (Norway/Denmark/Holland/Belgium, Spain/Portugal, Greece/Bulgaria/Rumania/Serbia). Never leave a home centre empty in Fall. Ask for one support instead of attacking alone. Use 💡 Hints every turn while you learn.
Try it safely. Set orders below, tap a unit then a highlighted province on the map, and press ⚔️ Resolve turn. Bots play the other powers, so you can learn solo, then switch “Playing as” for pass-and-play with friends.

Classic openings (one line each)

England: F Lon–NTH, F Edi–NWG, A Lvp–Yor — take Norway, eye Belgium.
France: A Par–Bur, A Mar–Spa, F Bre–MAO — Spain + Portugal, watch Italy.
Germany: A Ber–Kie, A Mun–Ruh, F Kie–Den — Denmark + Holland.
Italy: A Ven–Tyr, A Rom–Apu, F Nap–ION — Greece/Tunis, Austria decision looms.
Austria: A Vie–Gal, A Bud–Ser, F Tri–Alb — Serbia + Greece, talk to everyone.
Russia: A Mos–Ukr, A War–Gal, F Sev–Rum, F StP–BOT — Rumania, Sweden via Finland.
Turkey: A Con–Bul, A Smy–Con, F Ank–BLA — Bulgaria, then the Black Sea question.

AI endpoint (optional, yours)

Any OpenAI-compatible server works: OpenAI, OpenRouter, Ollama (http://localhost:11434/v1), LM Studio, llama.cpp. Your key stays in this browser only — it is never sent anywhere except the endpoint you type.

Enable AI features (persona press + AI Strategist) Base URL Model API key

Your profile

📸 Add / change profile photo

Your photo is stored only in this browser, shown next to your name, and unlocks the 📸 Face of an Empire trophy.

Google Sign-In

Backstabbr uses Google accounts — so does this. Paste your own Google OAuth Web Client ID (Google Cloud Console → APIs → Credentials) to enable real Google Sign-In here; your saves are then keyed to your Google profile on this device. Without a Client ID, Demo sign-in shows the full saved-profile flow.

Google Client ID

Notifications

Enable turn reminders on this device

Real cross-device Web Push needs a small VAPID push server — subscription + server stub are documented in docs/GOOGLE_SIGNIN_AND_PUSH.md. In-app and Android PWA notifications work from this page today.

Maps — Classic, variants & custom maps 🗺️

Pick a built-in map, import a variant JSON in the vDiplomacy/webDiplomacy data model (territories + borders + centres + coordinates), paste your own custom map, or download the current map and edit it. The bundled Classic variant lives in variants/classic.json.

Choose a map Centres needed to win on the loaded map (set by the map file)

Import variant / custom map JSON

…or paste a custom map JSON here and load it

Custom-map JSON is validated before loading — unknown border references, missing centres or missing starting units are reported (with a notification) instead of breaking the game.

Opponents

Powers you are not controlling are played by simple bots in this local edition, so a game always moves. Switch “Playing as” any time for hot-seat play with friends on one device.