Prediction Audit: Cobreloa vs San Marcos de Arica Prediction, Odds & AI Betting Tips

Cobreloa

Sep 01, 2026 - 00:00

2 1.31

0 1.29

xG Accuracy: 58%

San Marcos de Arica

AI correctly predicted the Cobreloa win.

The match finished 2–0, validating the model's directional assessment.

Tracked markets vs full-time result

Prediction grade B-

Each row compares the pre-match model lean to the full-time result.

Market Prediction Result Outcome
Over / Under 2.5 Under 2.5 Under 2.5 (2 goals) ✔ Correct
Both Teams To Score BTTS Yes No ✖ Incorrect
1X2 Cobreloa Cobreloa ✔ Correct
Correct Score Insights 1-1, 1-0, 0-1, 2-1, 1-2 2-0 ✖ Incorrect

Model vs Closing Market

Outcome	Model	Closing Market	Difference	Signal
Cobreloa	35.6%	48.6%	-13.0 pp	Market Higher
Draw	29.6%	26.8%	+2.8 pp	Aligned
San Marcos de Arica	34.7%	24.6%	+10.1 pp	Model Edge

The closing market estimates Cobreloa's win probability at 48.6%, compared with the model's estimate of 35.6%, a difference of 13.0 percentage points. This highlights a disagreement between the model and market consensus, without indicating which view is ultimately correct.

Model probabilities are generated from the statistical xG model using a Poisson distribution. Closing market probabilities are derived from consensus closing 1X2 odds after margin removal. Values represent implied probabilities rather than betting recommendations. Closing snapshot: PRE1.

After full time, the model's directional lean matched the result (Cobreloa win 2–0).

Market Assessment

The market is materially more optimistic about Cobreloa than the current fair estimate.

Investors may be incorporating information not fully reflected in the baseline model.
Tournament-specific context can shift market pricing.

Post Match Insights

What worked

Under 2.5 goals aligned with the xG profile

What failed

Both Teams To Score: model leaned BTTS Yes; match finished BTTS No
Exact score: outside the model's top score bins

Market lesson

Large model–market gaps do not automatically mean the market is right. Here the closing market priced Cobreloa higher (48.6% vs model 35.6%, 13.0 pp), but the model's lean was validated (Cobreloa win 2–0).

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Prediction Timeline

How this prediction moved from forecast to full-time review.

Aug 31, 2026 · 23:59 UTC Forecast generated
- Model 1X2 · Cobreloa 35.6% · Draw 29.7% · San Marcos de Arica 34.7%
- xG · Cobreloa 1.31 — San Marcos de Arica 1.29
Aug 31, 2026 · 23:29 UTC Opening odds snapshot PRE30
- 1X2 odds · Cobreloa 1.88 · Draw 3.41 · San Marcos de Arica 3.72
- Implied 1X2 · Cobreloa 48.6% · Draw 26.8% · San Marcos de Arica 24.6%
- Bookmaker · Pinnacle
Aug 31, 2026 · 23:59 UTC Closing snapshot recorded PRE1
- 1X2 odds · Cobreloa 1.88 · Draw 3.41 · San Marcos de Arica 3.72
- Implied 1X2 · Cobreloa 48.6% · Draw 26.8% · San Marcos de Arica 24.6%
- Bookmaker · Pinnacle
Sep 01, 2026 · 00:00 UTC Kickoff
FT Full-time result Cobreloa win · 2–0
FT Prediction validated Directional lean matched full-time result
Archived Prediction review

Historical Snapshot

Frozen at kickoff — the model output as it stood before the match started.

Historical verdict: Monitor

Historical Decision Monitor

Outcome Validated

Pre-match metrics (historical context)

Prediction Reliability 57/100 · Moderate

Validation: Warning
Large market gap (13 pp)

Evidence ★★★★★

No strong statistical edge
Market has already priced much of the edge
Validation warning

Pricing proximity (inverse gap) 35/100

Betting Confidence 45/100

Validation Report

Immutable Snapshot

Prediction Time: Aug 26, 2026 · 01:54 UTC Snapshot ID: dp-5500715

Closing Odds 1.88

AI Fair Odds —

CLV Pending

Final Result Cobreloa win · Cobreloa 2–0 San Marcos de Arica

Prediction ✔ Correct

Decision Grade B-

Model Performance

This prediction contributes to:

Primary Bets ROI (180d): -100.0%

Review FAQ

How accurate was the prediction?: This page grades directional markets (1X2, Over/Under 2.5, BTTS) against the full-time result. The prediction grade reflects how many of those tracked markets matched reality.
What does xG Accuracy measure?: xG Accuracy compares the model's pre-match expected-goals profile to the actual scoreline — not whether every market hit. A strong directional review can coexist with a moderate xG accuracy score.
Why wasn't the exact score predicted?: Correct-score outcomes are low-probability tails even when the model reads the match profile well. We highlight top score bins for context; missing the exact line does not invalidate a directional review.
Does this improve the AI record?: Each finished match is logged in our validation pipeline. Aggregated hit rates and CLV studies are published separately — this page is the per-match audit trail.

Predictions are for informational purposes only. Always gamble responsibly and within your limits. Past performance does not guarantee future results.

AI match briefing

AI Match Summary

Below is a compact, numbers-first snapshot aligned with the same engine as the cards above.

League: Primera B
Fixture: Cobreloa vs San Marcos de Arica
Kickoff: 2026-09-01 00:00:00
1X2 (model): Home 35.6% · Draw 29.7% · Away 34.7%
xG (showing): Cobreloa 1.31 — San Marcos de Arica 1.29 (total xG ≈ 2.6)
Value headline: None (actionable) — best tracked EV is about +1.0%, still below the +2.0% minimum for a headline / default stake (no default bet).
Structural leans (not bets): Structural lean (model): O/U 2.5 Under 2.5 (Under 2.5 51.8% · Over 2.5 48.2%); BTTS Yes (Yes 54.5% · No 45.5%) Value lean (pricing): O/U 2.5 Under 2.5; BTTS Yes
BTTS (model): Yes 54.5% · No 45.5%
Correct score (top bin): 1-1 (12.6%)

When book depth is thin or odds are missing, EV may be unavailable even though the model still prefers one side on totals or BTTS — wait for cleaner prices or skip.

If lines move materially, re-run generation or refresh — implied probabilities and any future EV readouts will change first.

Historical Recommendation

Historical Decision: Monitor

Outcome: Validated — Pre-match lean validated against the full-time result.

Risk Factors Considered Before Kickoff

Price movement: implied probabilities and EV move with odds.
Sample / data gaps: low-information leagues widen forecast bands.
In-play state: goals and red cards are not modelled here.
Scoreline variance: the most likely scoreline is still usually a low absolute probability outcome (often well below 20%).

Last Updated

September 30, 2026 (UTC)

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Primera B — Standings

#	TEAM	MP	W	D	L	PTS
1	Santiago Wanderers	24	12	8	4	44
2	Cobreloa	24	11	9	4	42
3	San Luis	24	11	8	5	41
4	Magallanes	25	11	7	7	40
5	Antofagasta	25	10	8	7	38
6	Recoleta	25	10	8	7	38
7	San Marcos de Arica	25	9	9	7	36
8	Union Espanola	25	10	6	9	36
9	D. Puerto Montt	25	10	4	11	34
10	Deportes Temuco	25	8	8	9	32
11	Deportes Copiapo	24	8	7	9	31
12	Deportes Iquique	25	6	10	9	28
13	Curico Unido	25	6	9	10	27
14	Deportes Santa Cruz	25	4	10	11	22
15	Union San Felipe	23	5	7	11	22
16	Rangers de Talca	25	4	6	15	18

#	TEAM	MP	GS	GC	+/-	PTS
1	Antofagasta	25	42	26	+16	38
2	Cobreloa	24	42	27	+15	42
3	Magallanes	25	41	38	+3	40
4	Santiago Wanderers	24	40	25	+15	44
5	Deportes Temuco	25	40	35	+5	32
6	San Luis	24	38	29	+9	41
7	Recoleta	25	36	33	+3	38
8	Deportes Iquique	25	33	30	+3	28
9	Deportes Copiapo	24	33	38	-5	31
10	Union Espanola	25	32	32	0	36
11	San Marcos de Arica	25	31	23	+8	36
12	D. Puerto Montt	25	26	31	-5	34
13	Deportes Santa Cruz	25	26	38	-12	22
14	Rangers de Talca	25	23	40	-17	18
15	Curico Unido	25	22	38	-16	27
16	Union San Felipe	23	15	37	-22	22