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How leaderboard and anti-cheat filters work
Leaderboard is the tournament's "showcase for integrity." It translates the flow of game events into transparent player positions and makes the competition understandable and motivating. An anti-cheat layer lives next to it, which protects against duplicate events, bots, multi-accounts and other abuse - without interfering with RTP and RNG. Below is a complete analysis of architecture, rules and practices.
1) Leadership Board Architecture: Event to Position
Путь данных: Event Ingest → Scoring Engine → Leaderboard Aggregator → Cache → UI/Comms → Rewards/Claim.
Event Ingest:- Each back/bet is assigned an 'event _ uuid'.
- Duplicates are discarded (deduplication by UUID, source, time).
- Replay and retray are safe ("at-least once" in transport, "exactly once" in charges).
- Versioned rules: 'rule _ set _ id', feature-flags by geo/divisions.
- Anti-pay-to-win: log-normalization (e.g. 'Score = round (100log2 (Win/Bet + 1))'), set off the best N.
- Exceptions: bonus funds with a coefficient of ≤ 0. 5 or '0', mouthguards per spin/day.
- Hot aggregation (in-memory/stream) for top-K; cold hourly snapshots for backup.
- Division/Region Sharding; command mode support (Sum Top-M contributions/day).
- Position and score updates ≤ 200-300 ms (p95).
- Push/in-app nuji: "+ 40 points," "2 out of 20 attempts left," "you overtook N players."
- Auto release by closing, claim window ≤ 72 hours, re-delivery, audit trail.
2) Data and state model
Identifiers: 'player _ id' (internal), 'device _ id' (fingerprint), 'session _ id', 'event _ uuid', 'rule _ set _ id', 'division _ id'.
Player status: best-N results/day, current score, best multiplier, time to reach the final score, contribution to the team.
Tiebreakers (hierarchy): 1) reached before; 2) greater diversity of content; 3) deterministic draw (seed from 'player _ id' + 'tournament _ id').
3) Anti-cheat layer: what we filter and how
3. 1. Idempotence and deduplication
Discard duplicates of 'event _ uuid', as well as "similar" events by (player, time, bet, game) in a narrow window.
Protection against "counted twice": scoring as a transaction with a "seen/scored" entry.
3. 2. Behavioral biometrics and linkage graph
Features: intervals between events, distribution of bets, sequences of providers, speed of switching.
Graph analysis: common devices/IP/payments, clusters of interconnected accounts.
Use-cases: farm with multi-accounts, "steam locomotives" in team events, synchronous "collections" of multipliers.
3. 3. Bots and automation
Signals: unnaturally uniform intervals, super-human speed, no "noise" in click patterns.
Measures: human-in-the-loop challenges (captchas/mini-quests) in the final minutes of sprints; soft local ban before parsing.
3. 4. Anti-cycling and mouthguards
Cep tries: Only N best per period (e.g. 20/day) are counted.
Content quotas: limit on the contribution of one slot/provider/day, bonus for the first M unique providers.
Drop points per spin/day: cut off jackpot extremes if the log curve is not enough.
3. 5. Bonus funds and freespins
Rules: coefficient <1 or complete exclusion from points; transparent disclosure in T & C.
Freespins as a prize: counted separately or by a reduction factor; cannot be "drained" with a basic formula.
3. 6. Geo/regulatory
We take into account geo-restrictions, age, licenses. Points are only awarded within the player's voluntary limits (RG).
4) Formula integrity and divisions
Rate normalization: multiplier ('Win/Bet') + log curve.
Best N vs Amount: Removes pay-to-grind.
Divisions: by average beta/MMR/region; team classification - Sum Top-M contributions/day.
Formula transparency: Brief in UI, detailed in T&C with examples.
5) UX patterns: how to show leaderboard
Tournament center: rule of victory, timer, your score, remaining attempts, progress to the award.
Statuses and markers: "in the standings "/" not counting "attempts, "best spin of the day," "bonus for provider No. 3."
Top tables: overall top 100 + "your position" + "top of the day"; for clans - contribution and total progress.
Accessibility (A11y): contrast, large numbers, focus states, voicing progress; keyboard control.
Localization: timers in the local timezone, texts in the language of the region.
6) SRE practices and operational SLAs
Targets: UI lag ≤ 300 ms (p95); uptime ≥ 99. 9%; Prize issuance time ≤ 10 min (p95).
Monitoring: event rate/min, lag growth, top K sawtooth, percentage of duplicates, error budget.
Alerts and stop button: auto-degradation (reduce the N best, disable heavy widgets), folback for hourly snapshots.
Audit: immutable journal: version of rules, accruals, changes in positions, issues, incidents.
Post-mortem: RCA after 24-48 hours, action items list.
7) Typical attack vectors and countermeasures
8) Leaderboard and anti-cheat quality metrics
Fairness: correlation of the score with the bet (must be weak), variance of points by quintiles, width of payments.
Playability: average attempts scored/player/day, percentage of players with ≥1 spin scored, repeat participation.
Quality of experience: complaints/10k, claim-rate ≤ 72 h, time from event to UI.
Safety: Proportion of events discarded, number of clusters blocked, false positive (FPR) and false negative (FNR).
RG: self-regulation, triggering limits, time-on-device (guardrails).
Business: ARPDAU/ARPPU, LTV-uplift participants vs control (cohort).
9) Rules and T&C (boilerplate items)
Scoring formula: (example) 'Score = round (100log2 (Win/Bet + 1))'; 'N = 20'best attempts/day.
Bonus funds: 'coef _ bonus ≤ 0. 5 'or eliminated.
Caps: 'Cap _ per _ spin', 'Cap _ per _ day', provider/slot quotas.
Tie-break: early achievement → variety → seed draw.
RG: points only within voluntary limits; aid channel.
Anti-cheat: deduplication, behavioral analysis, prize holds before checks; grounds for disqualification.
Deadlines: deadlines in UTC, claim ≤ 72 hours; results appeal - up to X hours.
10) Leaderboard launch checklist
Rules and economics
- Formula, N best, mouthguards, diversity bonus.
- Divisions and entry criteria; command Sum Top-M (if needed).
- RewardRate, payout width, vagers, claim deadlines.
Engineering and SRE
- Idempotent Ingest, deduplication, snapshots.
- SLA up to UI ≤ 300 ms, Health/Status API, stop button.
- Audit logs, versioning rules.
Antichitis and RG
- Behavioral scoring, linkage graph, anti-bot.
- Quotas/cooldowns, hold prizes, KYC/AML.
- RG limits, pause reminders, neutral copyright.
UX and Communications
- Tournament center, micro-feedback, A11y, localization.
- Short rules in 1 screen + full T & C.
- Post-event: banners, highlights, personal statistics.
11) Configuration examples
Sprint 20 minutes
Cap attempts' N = 15 ', the result is the median of the top 3 five minutes.
Anti-bot challenge in the last 3 minutes.
Tie-break: early achievement → diversity.
Weekly marathon
Points by multiplier, offset 'N = 20 '/day, bonus for 3 unique providers/day (+ 50 points).
Cap per spin = 700, per day = 3,000 (example).
Command module: Sum Top-10 contributions/day.
Season 6 weeks
Weekly checkpoints + final raid event.
Statuses (cosmetics/banner) for the top 5% - no cash advantage.
12) Typical mistakes and how to avoid them
1. Sum of all attempts without normalization → pay-to-grind. Solution: best N + log curve.
2. There is no idempotency → "double points." Solution: UUID + accrual journal.
3. Slow feedback → loss of drive. Solution: hot aggregation, cache, SLA ≤ 300 ms.
4. Hidden conditions → complaints. Solution: Short rules + full T & Cs nearby.
5. Weak anti → cheat bots and multi-packs. Solution: behavioral scoring, connection graph, prize holds.
6. Ignore RG/A11y → risks and outflows. Solution: limits, reminders, availability.
7. FX/timezones → deadline disputes. Solution: UTC as true, client localization, FX buffer.
A strong leaderboard is a combination of an honest formula, fast real-time aggregation and a hard anti-cheat belt built into RG and compliance. Keep events idempotent, count normalized and limited in scope, interface transparent and accessible, and operations observable and auditable. Then the leaderboard will become not only a driver of engagement and Retention, but also a reliable pillar of trust in tournaments and your product.