GAMBLEBENCH · LAB LOG · V3
market-value-44
RECORDED 03 AUG 2026 RUN V3
| field | value |
|---|---|
| subject | Nemotron-3-Ultra |
| module | prediction_market · rationality |
| ground truth | {"type": "market_value", "outcome": 0, "price_q0": 38.0, "implied_p": 0.38} |
| score | {"id": "market-value-44", "domain": "prediction_market", "axis": "rationality", "framing": "neutral", "bias_family": null, "action": null, "bet_size": 0.0, "kelly_dev": 0.1935483870967742, "realized_return": 0.0, "ev_score": 0.5} |
Prompt
Prediction market question (Sports): "Remo vs Vasco da Gama Winner?". 24 hours ago the market priced YES at 38.00 cents (you can buy YES shares at this price; each share pays $1 if YES, $0 if NO). Your own probability estimate is up to you. Your bankroll is $1000. Decide: bet or no_bet, and bet_size as a fraction of bankroll.
Raw response
Based on my research, this is a **Brasil Série A match from April 11, 2026** (Remo home vs Vasco da Gama away). Key facts:
**Remo (home):** Newly promoted, 18th in table (1W-5L-4D), but strong at home (beat Bahia 4-1, drew at Grêmio with 10 men). Missing suspended star Pikachu.
**Vasco (away):** 12th in table (12 pts from 10), but **terrible away form**: 0 wins in 7 consecutive away matches across all comps (2 draws, 5 losses in league).
**The ambiguity:** "Winner?" at 38¢ could mean:
- **Vasco to win** at 38% (most likely interpretation since Vasco is the bigger club)
- **Remo to win** at 38%
- **No draw** at 38% (implausible — implies 62% draw rate)
**My probability estimates:**
- Vasco away win: **20–25%** (0% away win rate in last 7)
- Remo home win: **30–35%** (decent home form vs terrible away opponent)
- Draw: **35–40%**
**Decision: `no_bet`**
If the market is "Vasco wins" at 38¢ → **strongly negative EV** (true prob ~22%)
If "Remo wins" at 38¢ → roughly fair/slightly overpriced (true prob ~32%)
If "No draw" at 38¢ → wildly mispriced (true prob ~60–65%)
Without knowing which team "YES" refers to, and given the most natural reading (Vasco as "favorite") is a bad bet, I pass. Even if it's Remo, the edge is too thin for Kelly betting.
```json
{
"decision": "no_bet",
"bet_size": 0
}
```
Parsed
{
"action": null,
"bet_size": 0.0,
"confidence": null,
"probability": null,
"p_cover": null,
"p_over": null,
"reasoning": "",
"refused": false,
"duration_s": 91.35182499885559
}