Select up to two lottery systems and run Monte Carlo simulations to compare their effects on tanking behavior, competitive balance, and draft equity.
Historical NBA Season Analysis
Pick a real NBA season (2000–01 through 2025–26) and see how each lottery system would have assigned draft picks — compared to what actually happened.
System Reference — How Each One Works
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| 1 | Current NBA |
The three worst teams each receive 14% odds for pick #1. Odds taper to 0.5% at the 14th slot. Picks 1–4 are drawn by weighted lottery; picks 5–14 follow record order (worst first).
Pick #1 odds by slot
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✓ NBA (current) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 2 | Flat Bottom |
Every one of the 14 lottery teams gets exactly equal odds (~7.1% each) for pick #1. The lottery still applies to picks 1–4; picks 5–14 go by record. Losing an extra game gives no lottery advantage whatsoever.
Pick #1 odds by slot
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| 3 | Play-In Boost |
The 4 teams that just missed the playoffs (play-in zone) receive the highest lottery odds — equal to or better than any floor team. Being competitive enough for the play-in is the reward; bottoming out is not.
Pick #1 odds by slot
Slots 11–14 are play-in teams (closest to the playoff cut)
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| 4 | UEFA Coefficient |
A rolling 3-year weighted score (50% current / 30% prior / 20% two years ago) determines each team's lottery weight. One bad season barely moves the needle — you need sustained futility to earn top odds. This kills one-year tanking but rewards genuine rebuilds.
Pick #1 odds by slot
Approximate — actual odds vary by each team's 3-year performance history.
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Inspired by UEFA | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 5 | RCL |
Multi-year coefficient (similar to UEFA) plus head-to-head record versus other lottery teams. Hard caps enforce fairness: no team can receive the #1 pick more than once in 5 years, or a top-3 pick more than twice in 5 years.
Pick #1 odds by slot
Approximate — teams capped on #1 or top-3 picks are excluded from those slots and their weight is redistributed.
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| 6 | Lottery Tournament |
The 8 worst teams by record play a single-elimination tournament. The tournament winner earns pick #1. Teams 9–14 get picks 9–14 by record. You need to be in the bottom 8 AND win games to land the top pick.
Pick #1 odds by slot
Slots 1–8 enter the tournament. Slots 9–14 cannot win pick #1. Values are approximate win-probability estimates.
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| 7 | Pure Inversion |
No lottery at all. The best non-playoff team picks #1; the worst non-playoff team picks last. This completely inverts the tanking incentive — losing hurts your draft position. Every team should try hard all season.
Pick #1 odds by slot
Deterministic. Only the best non-playoff team (slot 14) gets pick #1.
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| 8 | Gold Plan (PWHL) |
Draft order is determined by wins accumulated after a team is mathematically eliminated from playoff contention. Teams that keep competing hard after elimination are rewarded. This system is used in real life by the PWHL.
Pick #1 odds by slot
Approximate — actual odds depend on when each team is eliminated and post-elimination performance, not record directly.
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✓ PWHL (live) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 9 | Chip Window |
Proposed by Ron Bronson (2026). Activates at game 60 for all 30 teams. Starting chips are assigned by quintile: the worst 6 teams begin with 100, the next 6 with 80, middle 6 with 60, next 6 with 40, and the best 6 with 20 — giving bad teams more firepower without rewarding additional losing. All 30 teams have a pre-assigned home night where they may declare their double. Analytics teams bid with fine-grained precision (2 decimal places) to avoid ties. Chips are clamped at 10 — teams always have enough to bid next game. The 14 lottery teams' final chip totals determine draft order directly: most chips = Pick 1, fewest chips = Pick 14. Fully deterministic — no lottery draw. Ties (rare) are broken by worse record. Picks 15–30 go to playoff teams by record. Tanking is structurally impossible: losing depletes chips at the same rate regardless of intent.
Pick #1 odds by slot
Deterministic chip-standings draft order. Most chips = Pick 1 among the 14 lottery teams. Worst-record teams start with more chips (100 vs 20 for the best teams) but still must earn their pick by outperforming rivals in the 22-game chip window. Approximate pick-position probabilities shown; actual results depend on each season's chip window outcomes.
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| 10 | The Wheel |
Every team cycles through all 30 pick positions on a fixed 30-year rotation. No randomness — each team's draft slot is known years in advance. Tanking is completely pointless because record has zero impact on draft position.
Deterministic. Draft slot is pre-assigned by rotation; all teams pick 1st exactly once every 30 years.
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Proposed reform | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 11 | Pre-2019 Legacy NBA |
The original NBA lottery system in use before 2019. The worst team receives 25% odds for pick #1, the 2nd-worst 19.9%, the 3rd-worst 15.6%, tapering sharply to 0.5% at slot 14. Only picks 1–3 are drawn by lottery; picks 4–14 follow record order.
Pick #1 odds by slot
Authentic pre-2019 odds. Only the top 3 picks are drawn by lottery; pick 4+ go strictly by record.
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✓ NBA (pre-2019) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 12 | Equal Odds |
All 14 lottery teams have exactly equal 7.14% odds for the #1 pick. Picks 1–4 are drawn by equal-weight lottery; picks 5–14 go strictly by record (worst first). Maximally random — record has no bearing whatsoever on landing a top-4 pick.
Pick #1 odds by slot
Picks 1–4 are drawn by equal-weight lottery from all 14 teams. Picks 5–14 go by record.
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| 13 | Top-4 Only Lottery |
Only the 4 worst teams by record enter a weighted lottery for picks 1–4. The worst team gets the most lottery weight (40%), tapering to 10% for the 4th-worst. Teams ranked 5–14 receive picks 5–14 in strict record order.
Pick #1 odds by slot
Only the 4 worst teams enter the lottery. Weights: 40/30/20/10% (worst to 4th-worst). Slots 5–14 get picks 5–14 by record.
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| 14 | Current NHL |
The NHL Entry Draft Lottery determines only picks #1 and #2 by weighted draw. The worst team has 18.5% odds for pick #1, tapering to 0.5% for the 16th slot. Picks 3–16 are then assigned in strict reverse-standings order. Introduced in its current form for the 2024 draft.
Pick #1 odds by slot
Official NHL Entry Draft Lottery odds (2024+). Only picks #1 and #2 are drawn by lottery; picks 3–16 follow record order.
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| 15 | Current MLB |
MLB introduced a draft lottery in 2023 for the top 6 picks among the 18 non-postseason teams. The two worst teams share the highest odds at 16.5% each for pick #1, tapering sharply to 0.5% at slots 17–18. Picks 7–18 are assigned in strict reverse-standings order.
Pick #1 odds by slot
Official MLB Draft Lottery odds (2023+). Picks #1–#6 are drawn by lottery; picks 7–18 follow record order.
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