Identity & Scope
The queried name 83F is treated as an unknown identity unless accompanied by a reviewed primary source. A search snippet, similarly named domain, or search position is not evidence of an official company, account address, app, or service.
This guide does not certify or reproduce any outside product. The demo belongs to this independent guide and uses its own virtual-coin wallet, distinct from any external platform.
Original Demo: Square Range Mines
Square Range Mines is an original game developed for this guide. It uses a 4×4 board with printed labels 1..16 in row-major order.
- Hazard Selection: Before a round, select 3, 4, or 5 hazards. Uniformly sample only complete subsets satisfying: The difference between the largest and smallest hazard labels is a perfect square.
- Support: All safe observations filter this finite support. The support count varies by hazard count (e.g., 92 for 3 hazards).
- Pricing: Initial quoted value is 97% of captured stake. Each uncertain successful reveal divides CURRENT gross value by its exact posterior safe probability; probability 1 reveals leave it unchanged.
- Settlement: One captured stake per round. At settlement, floor(raw gross return + stored fractional carry) is credited; remainder persists. Zero-return rounds leave fractional carry unchanged.
- Stopping Rules: Collect after at least one safe reveal. Choices with gross return above 1000×stake are disabled, while equality is allowed. Bank automatically only if no eligible uncertain choice remains.
Wallet & Persistence
The demo uses a local virtual-coin wallet stored in browser localStorage.
- Initial Balance: 1000 play coins.
- Restoration: Manual idle-only restoration is eligible while idle if balance is below 10. It SETS the balance to exactly 1000.
- Fractional Carry: Persists in browser localStorage across settlement, refill, and reload. Refill does not clear it.
- Unfinished Round: Captured stake remains deducted; unfinished round ends without refund, payout, continuation, or resume.
- Controls: Default stake is 20. Settings, restoration, and starting another round are locked while a round is active.
Mathematical Evidence
| Hazards | Compatible layouts |
|---|---|
| 3 | 92 |
| 4 | 232 |
| 5 | 404 |
Collectable value: 0.97 × Stake; Safe chance = p; V(next) = V(current) / p
Worked Example
Based on the supplied source:
- Hazards: 3
- Support Count: 92
- Printed Label: 3
- Posterior Safe Probability: 0.8369565217391305
- Initial Gross at Stake 20: 19.4
- Gross After Safe Reveal: 23.179220779220778
Privacy & Audience
Audience: This guide and its virtual-coin demo have an 18+ intended audience.
Storage: Virtual-coin balance and fractional payout carry are stored in browser localStorage. Clearing cached files may leave local storage.
Third Parties:The absence of account or payment controls in the demo does not prove that no personal data are processed.
Frequently asked questions
Is 83F an official operator?
No. Unless explicitly accompanied by a reviewed primary source, the queried name 83F does not establish an operator, business, or official service. This demo is an original creation of this independent guide.
How does the wallet restoration work?
Restoration is manual and idle-only. If the balance is below 10 while idle, it can be set to exactly 1000. This is a set operation, not an addition. Fractional carry persists across refills and reloads.
What happens if I reload during an unfinished round?
The captured stake remains deducted. The unfinished round ends without refund, payout, continuation, or resume. Controls return to default stake (20) and first preset.
