Predictions / Football / England. League Two / Walsall vs Grimsby

Prediction Audit: Walsall vs Grimsby Prediction, Odds & AI Betting Tips

Walsall Walsall
Aug 22, 2026 - 11:30
0 1.49
0 1.81
xG Accuracy: 40%
Grimsby Grimsby

The model missed the final outcome (Draw 0–0).

The model had projected Grimsby at 44.1%, but the full-time result went the other way.

Tracked markets vs full-time result

Prediction grade F

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

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

Model vs Closing Market

Broadly Aligned

The model and closing market are broadly aligned.

Largest probability gap: Grimsby +4.8 pp

Outcome Model Closing Market Difference Signal
Walsall 30.6% 31.9% -1.3 pp Aligned
Draw 25.3% 28.8% -3.5 pp Aligned
Grimsby 44.1% 39.3% +4.8 pp Aligned

The model and closing market are broadly aligned, with probability differences below 5 percentage points.

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 result was Draw 0–0.

Market Assessment

The market and model are broadly aligned. Any small pricing gap likely reflects rounding or bookmaker margin, not a structural disagreement.

  • Current pricing remains close to the model baseline.

Post Match Insights

What failed

  • Both Teams To Score: model leaned BTTS Yes; match finished BTTS No
  • Over / Under 2.5: model leaned Over 2.5; match finished Under 2.5 (0 goals)

Market lesson

The full-time result was Draw 0–0, which did not match the model's pre-match lean on 1X2.

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Prediction Timeline

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

  1. Aug 22, 2026 · 11:30 UTC Forecast generated
    • Model 1X2 · Walsall 30.6% · Draw 25.3% · Grimsby 44.1%
    • xG · Walsall 1.49 — Grimsby 1.81
  2. Aug 22, 2026 · 11:03 UTC Opening odds snapshot PRE30
    • 1X2 odds · Walsall 2.99 · Draw 3.31 · Grimsby 2.43
    • Implied 1X2 · Walsall 31.9% · Draw 28.8% · Grimsby 39.3%
    • Bookmaker · Pinnacle
  3. Aug 22, 2026 · 11:30 UTC Closing snapshot recorded PRE1
    • 1X2 odds · Walsall 2.99 · Draw 3.31 · Grimsby 2.43
    • Implied 1X2 · Walsall 31.9% · Draw 28.8% · Grimsby 39.3%
    • Bookmaker · Pinnacle
  4. Aug 22, 2026 · 11:30 UTC Kickoff
  5. FT Full-time result Draw · 0–0
  6. FT Prediction missed 1X2 lean did not match full-time result
  7. Archived Prediction review

Historical Snapshot

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

Historical verdict: Observe
Historical Decision No Primary Bet
Outcome Missed
Pre-match metrics (historical context)
Prediction Reliability 77/100 · High
  • Validation: Pass
Evidence ★★★★★
  • No strong statistical edge
  • Direction agrees with model lean
  • Validation passed
Market Compatibility 76/100
Betting Confidence 80/100

Validation Report

Immutable Snapshot

Prediction Time: Aug 16, 2026 · 01:19 UTC Snapshot ID: dp-4216341

Closing Odds 2.43
AI Fair Odds —
CLV Pending
Final Result Draw · Walsall 0–0 Grimsby
Prediction ✖ Missed
Decision Grade F

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: League Two
  • Fixture: Walsall vs Grimsby
  • Kickoff: 2026-08-22 11:30:00
  • 1X2 (model): Home 30.6% · Draw 25.3% · Away 44.1%
  • xG (showing): Walsall 1.49 — Grimsby 1.81 (total xG ≈ 3.3)
  • Value headline: None (actionable) — best tracked EV is about +0.3%, 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 Over 2.5 (Under 2.5 35.9% · Over 2.5 64.1%); BTTS Yes (Yes 66.1% · No 33.9%) Value lean (pricing): O/U 2.5 Over 2.5; BTTS Yes
  • BTTS (model): Yes 66.1% · No 33.9%
  • Correct score (top bin): 1-1 (9.9%)

The decision block shows no default Primary: Primary needs consensus EV ≥ +5.0% plus strength/reliability/calibration gates. A separate Lean/tracked gate is +2.0% (selective only). Lean labels are directional only — not bankroll-sized recommendations.

Prefer skipping to over-staking when the engine is honest about missing edge.

Historical Recommendation

Historical Decision: No Primary Bet

Outcome: Missed — Pre-match 1X2 lean did not match 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 16, 2026 (UTC)

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League Two League Two — Standings
# TEAM MP W D L PTS
1 Bristol Rovers 5 4 0 1 12
2 Swindon Town 5 3 1 1 10
3 Barnet 5 2 3 0 9
4 Tranmere 5 2 3 0 9
5 Walsall 5 2 3 0 9
6 Fleetwood Town 5 2 3 0 9
7 Crewe 5 2 3 0 9
8 Cheltenham 5 2 2 1 8
9 York 5 2 2 1 8
10 Oldham 5 2 1 2 7
11 Grimsby 5 1 4 0 7
12 Colchester 5 2 1 2 7
13 Gillingham 5 1 3 1 6
14 Northampton 5 1 3 1 6
15 Salford City 5 2 0 3 6
16 Exeter City 5 1 2 2 5
17 Chesterfield 5 1 2 2 5
18 Rotherham 5 1 2 2 5
19 Accrington ST 5 1 2 2 5
20 Newport County 5 1 1 3 4
21 Crawley Town 5 1 1 3 4
22 Rochdale 5 1 0 4 3
23 Shrewsbury 5 1 0 4 3
24 Port Vale 5 0 2 3 2
# TEAM MP GS GC +/- PTS
1 Bristol Rovers 5 12 6 +6 12
2 Barnet 5 12 8 +4 9
3 Cheltenham 5 10 9 +1 8
4 Tranmere 5 9 5 +4 9
5 York 5 9 8 +1 8
6 Newport County 5 9 10 -1 4
7 Accrington ST 5 9 11 -2 5
8 Walsall 5 8 4 +4 9
9 Swindon Town 5 8 6 +2 10
10 Oldham 5 7 5 +2 7
11 Grimsby 5 7 6 +1 7
12 Fleetwood Town 5 6 3 +3 9
13 Gillingham 5 6 6 0 6
14 Chesterfield 5 6 7 -1 5
15 Rotherham 5 6 7 -1 5
16 Colchester 5 6 8 -2 7
17 Crewe 5 5 3 +2 9
18 Crawley Town 5 5 8 -3 4
19 Rochdale 5 5 10 -5 3
20 Exeter City 5 4 4 0 5
21 Salford City 5 4 6 -2 6
22 Northampton 5 3 3 0 6
23 Port Vale 5 2 7 -5 2
24 Shrewsbury 5 2 10 -8 3
# TEAM MP xG xGC +/- PTS
1 Accrington ST 5 3.0 0.5 +2.5 5
2 Walsall 5 3.5 1.8 +1.7 9
3 Rotherham 5 2.2 0.7 +1.5 5
4 Northampton 5 1.6 0.3 +1.3 6
5 Barnet 5 2.8 1.8 +1.0 9
6 Shrewsbury 5 2.1 1.2 +0.9 3
7 Crewe 5 1.7 0.8 +0.9 9
8 Grimsby 5 1.9 1.1 +0.8 7
9 Oldham 5 1.5 0.9 +0.6 7
10 Bristol Rovers 5 2.0 1.6 +0.4 12
11 Fleetwood Town 5 1.9 1.5 +0.4 9
12 York 5 1.6 2.0 -0.4 8
13 Chesterfield 5 1.5 1.9 -0.4 5
14 Port Vale 5 0.9 1.5 -0.6 2
15 Exeter City 5 1.1 1.9 -0.8 5
16 Tranmere 5 1.2 2.1 -0.9 9
17 Crawley Town 5 0.8 1.7 -0.9 4
18 Salford City 5 1.8 2.8 -1.0 6
19 Swindon Town 5 0.3 1.6 -1.3 10
20 Cheltenham 5 0.7 2.2 -1.5 8
21 Gillingham 5 1.8 3.5 -1.7 6
22 Colchester 5 0.5 3.0 -2.5 7
23 Newport County 5 — — — 4
24 Rochdale 5 — — — 3
League Two England. League Two Predictions