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Scrabble Game — Functional spec

Per-domain user stories: what each user-visible operation does. This is the starting point for any change request that touches behaviour. The English version is authoritative; FUNCTIONAL_ru.md is a mirror for the project owner — mirror every point edit in the same patch (translate only the changed paragraphs). Sections deepen as stages land; (Stage N) marks where the detail is authored.

Domains

Identity & sessions (Stage 1 / 6)

A player arrives from a platform (Telegram first), via email login, or as an ephemeral guest. The gateway validates the credential once and mints a thin session token; the backend resolves it to an internal user_id. Guests are session-only with restricted features (auto-match only; no friends, stats or history).

Accounts, linking & merge (Stage 1 / 10)

First platform contact auto-provisions a durable account. From the profile a player links additional platform identities or an email via a confirm flow; linking an identity that already has history merges it into the current account (stats summed, games/friends transferred).

Lobby & matchmaking (Stage 4)

Bottom tab menu: my games, profile. Auto-match (always 2 players) joins a (variant, language) pool; after 10 s with no human, the robot substitutes. Friend games (24) are formed by friend list, internal ID, or deep-link.

Playing a game (Stage 3)

Place tiles, pass, exchange, or resign. A play is validated against the dictionary at submit time and scored. One hint per game reveals the best move. The dictionary check tool is unlimited and offers a complaint. The game ends when the bag empties and a player clears their rack, after 6 consecutive scoreless turns, or by the 24-hour move timeout (auto-resign).

Robot opponent (Stage 5)

Indistinguishable-from-human substitute in auto-match. Decides once whether to play to win (~40%), targets a small score margin, plays with human-like timing and a night sleep window, and nudges/answers nudges like a person.

Social: friends, block, chat, nudge (Stage 4)

Add friends; block chat and/or friend requests independently; per-game chat; nudge the awaited opponent at most once per hour (platform-native push).

Profile & settings (Stage 4)

Language (en/ru), display name, linked accounts, email binding, timezone, block toggles.

History & statistics (Stage 3)

Finished games are archived in a dictionary-independent form and exportable to GCG. Statistics: wins, losses, max points in a game, max points for one word.

Administration (Stage 9)

Admin (Basic Auth at the gateway) reviews word complaints, manages dictionary versions, and inspects users/games.