Odds — 1v1 Number Prediction Duel

How to play Odds

1. 1Sign in, open the lobby and press Play to face a live opponent, or take a free practice match against the bot.
2. 2Each round starts with a range: 1–100, then 1–50, 1–25, 1–12, 1–6, and finally 1–3.
3. 3Phase 1 — pick your number: both players independently lock in a hidden number inside that range.
4. 4Phase 2 — predict: once both numbers are locked, each player predicts the opponent's number inside the same range.
5. 5Both predictions stay hidden until both are submitted. Then the round reveals both numbers, both predictions, and the points each prediction earned.
6. 6After six rounds, the higher cumulative score wins.

Rules

• A match is six rounds. Every round is simultaneous — there are no turns and no roles.
• The range shrinks on a fixed schedule, purely halved and floored: round 1 is 1–100, round 2 is 1–50, round 3 is 1–25, round 4 is 1–12, round 5 is 1–6 and round 6 is 1–3.
• Your chosen number is never sent to your opponent while the round is live, and both predictions stay hidden until both players have committed.
• A prediction outside the round's range scores zero.
• After six rounds the higher cumulative score wins; an exact tie is a draw.

Scoring — what decides the winner

• Scoring uses a fixed band table that is identical in every round: an exact match scores +100, off by 1 scores +80, off by 2 scores +60, off by 3 scores +40, off by 4–5 scores +20, off by 6–10 scores +10, and more than 10 off scores 0.
• A prediction can never earn more than +100.
• The shrinking range only bounds what counts as a valid prediction — it never changes the bands and never scales the points.
• The player with the higher cumulative score after six rounds wins the match.

Strategy and tips for Odds

• Do not assume the range is the scoring curve. It is not — the bands are the same in round 1 and round 6, so a late round is worth exactly as much as an early one, just with far less room to miss.
• Avoid the obvious numbers when picking. People over-pick the mid-range and the culturally famous picks, and every player who guesses a number you also chose is a player you handed points to.
• Model your opponent, not the uniform distribution. If they have picked near the top of the range twice, the middle is where their next pick is least likely to be.
• Go for the exact match. Bands fall off fast: being off by 4 already caps you at +20, so splitting the difference is worth far less than committing to one number.
• Break your own pattern. In a shrinking range you will run out of numbers you have not used, and a player who notices your preference for one end of the range can price it in.
• Protect a lead by picking counter-intuitively. Late rounds are low-scoring for everyone, so an unusual number that nobody would predict is often worth more than a 'safe' one.

What it tests

Odds tests opponent modelling and decision-making with hidden information. You are trying to predict a decision another person made while protecting your own, and the shrinking range closes down your options every round.

Odds FAQ

Can my opponent see my number?

No. Both chosen numbers and both predictions stay hidden until both players have submitted their predictions for the round.

Does the shrinking range change the points?

No. The band table is identical in every round. The range only limits what counts as a valid prediction.

What is the range schedule?

Round 1 is 1–100, then 1–50, 1–25, 1–12, 1–6, and 1–3 in the final round.

What if the score is tied after six rounds?

The match is recorded as a draw. No winner is invented.

Is it free to play?

Yes. There is no wager and no entry cost; ranked results move your Elo and trophies.

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Getting better at Odds

• How to Read Your OpponentPattern reading in 1v1 games: tracking habits, punishing predictability, when to break your own pattern, and how hidden-information duels reward inference over instinct.