Backgammon – Transparency & Security

What Is Server-Authoritative?

The server validates all game actions. Your device only displays the game state — it can't modify or influence outcomes.

The server controls:

• Dice generation
• Move validation
• Timer management

The player controls:

• When the dice are generated
• Checker movement

How Are Dice Generated?

All dice rolls are generated on the server using Rust's rand crate:

• Each die roll is a random number from 1 to 6
• Unbiased rolls — each value (1–6) has equal probability
• Cryptographically secure RNG (ChaCha-based, same class used in TLS)
• Seeded from operating system entropy — the gold standard for randomness
• Uses Rust's standard random number generator (rand crate v0.10)

// engine/src/manager/dice_manager.rs
let value = rand::rng().random_range(1..=6);

Who Goes First?

The server randomly decides which player goes first:

• Uses a random boolean (true/false) to select the starting player
• Each player has exactly a 50% chance to start
• Neither player is more likely to go first

Why Does This Matter?

• Cheating isn't possible — all game logic runs on the server
• Every decision (dice, moves, wins) is validated server-side
• Your device only displays what the server tells it
• The server is the single source of truth — no one can manipulate outcomes

Paid Content

Items like tea and checker skins are about personal style.

• Earned through play, or available to purchase
• No effect on game results

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