St. Louis Cardinals @ Pittsburgh Pirates
SLCAwaySt. Louis Cardinals38%
@PPHomePittsburgh Pirates62%
Model PickPittsburgh Pirates 62%Market edge — disclosed after closing odds are collectedEvidence 12 structured · 4 qualitative
AI Summary grounded in real data · zero hallucination
We recommend backing the Pittsburgh Pirates, who hold a 62% win probability for this matchup. This pick is primarily driven by solid advantages in 'Home Advantage', 'Last 10 Games Form', and 'Team OBP', each contributing a +2.5% delta. However, a notable deficit of -1.7% in the 'Starting Pitcher Matchup' serves as the primary swing risk, with the edge against the market remaining uncalculated.
Logistic-regression statistical model — predicts St. Louis Cardinals vs Pittsburgh Pirates by accumulating the log-odds contributions of 12 proven structured metrics. Only structured metrics enter the probability; qualitative and folklore factors get a label only. Predictions are sealed with SHA-256 before the game.
Model factor contribution How the 62% home win was derived
Home Advantage+2.5
Pythagorean Expectation+1.3
Season Win%+0.3
Last 10 Games Form+2.5
Home/Away Split+0.4
Team OBP+2.5
Team SLG+1.7
Team ERA+0.8
Team WHIP+1.4
Starting Pitcher Matchup-1.7
Baseline 50% → final home win61.8%
Each factor's log-odds contribution accumulated · only structured metrics reflected (qualitative/folklore excluded) · each %p converts log-odds to probability, so it's non-linear — a simple sum may not exactly equal (final − baseline)
Structured metric analysis 12 metrics · fully disclosed
| Metric | Analysis (home vs away) | Source |
|---|---|---|
| Home Advantage | Pittsburgh Pirates at home — MLB historical home win rate ~.535 (ballpark familiarity, no travel) | MLB StatsAPI |
| Pythagorean Expectation | Home 51.8% (748 RS/719 RA) vs Away 48.5% (704/727) — strength from runs scored/allowed | MLB StatsAPI |
| Season Win% | Home 79-77 (.506) vs Away 76-80 (.487) | MLB StatsAPI |
| Last 10 Games Form | Home 6-4 vs Away 4-6 · Home W4 | MLB StatsAPI |
| Home/Away Split | Home team home 42-36 · away team away 38-37 | MLB StatsAPI |
| Team OBP | Home .332 vs Away .315 — foundation of scoring | MLB StatsAPI |
| Team SLG | Home .406 vs Away .382 (OPS .738/.697) | MLB StatsAPI |
| Team ERA | Home 4.19 vs Away 4.29 — lower is better | MLB StatsAPI |
| Team WHIP | Home 1.30 vs Away 1.36 — baserunners allowed per inning (lower is better) | MLB StatsAPI |
| Starting Pitcher Matchup | Home Jared Jones (ERA 4.17) vs Away Andre Pallante (ERA 3.70) | MLB StatsAPI |
| Hitting Detail (BABIP, K, BB) | Home BABIP .315 · K 1452 · BB 551 / Away BABIP .284 · K 1234 · BB 496 (BABIP is luck-driven → not factored into probability) | MLB StatsAPI |
| Pitching Detail (K/BB, HR9) | Home K/BB 2.54 · HR9 0.97 / Away K/BB 2.27 · HR9 1.00 | MLB StatsAPI |
Qualitative & folklore factors 4 factors · fully disclosed
Qualitative · Pirates' Crushing Reality
The Pittsburgh Pirates are facing a 'devastating reality' against the St. Louis Cardinals, which could negatively impact team morale and performance.
Basis: LLM · news · Falling Short AGAIN Pittsburgh Pirates Face DEVAST
Qualitative · Rivalry Matchup
As division rivals, the Cardinals and Pirates often bring an extra level of intensity and motivation to their matchups, beyond a typical regular season game.
Basis: LLM · news · Cardinals meet Pirates
Qualitative · Pirates' Home Streak
The Pittsburgh Pirates are aiming to extend their home win streak, which could provide an additional boost in motivation playing in front of their home crowd.
Basis: LLM · news · aim to extend home win streak
Qualitative · Young Stars' Spotlight
The game between the Cardinals and Pirates will put a spotlight on the young star players from both teams, potentially increasing individual motivation to perform.
Basis: LLM · news · Young stars take spotlight
12 source headlines (auto-collected · basis disclosed)
- St. Louis Cardinals at Pittsburgh Pirates Series Preview
- St. Louis Cardinals at Pittsburgh Pirates Preview - 09/22/2026
- Falling Short AGAIN Pittsburgh Pirates Face DEVASTATING Reality as St. Louis Cardinals Loom
- Falling Short AGAIN Pittsburgh Pirates Face DEVASTATING Reality as St. Louis Cardinals Loom
- Falling Short AGAIN Pittsburgh Pirates Face DEVASTATING Reality as St. Louis Cardinals Loom
- Pirates host the Cardinals, aim to extend home win streak
- Young stars take spotlight as Cardinals meet Pirates
- Cardinals Probable Starters for Upcoming Series with Pirates
Frequently asked questions This game's prediction summary
St. Louis Cardinals vs Pittsburgh Pirates — who's more likely to win?
SealedSlate's logistic-regression statistical model gives Pittsburgh Pirates a 62% chance to win (Home 62% · Away 38%). MLB · 2026-09-23 07:40 KST.
How was the 61.8% home-win probability calculated?
Starting from a 50% baseline, we additively accumulate the log-odds contributions of 12 proven structured statistical metrics to reach the final 61.8%. Each factor's %p contribution is fully disclosed on the page; qualitative and folklore factors are not reflected in the probability.
Can this prediction be altered later?
No. Every prediction is sealed with a SHA-256 hash before the game starts and permanently recorded in the track record, making after-the-fact changes impossible. SealedSlate runs a transparent ledger that never inflates the hit rate and leaves missed predictions exactly as they were.
We don't compete on hit rate — every factor is fully disclosed and labeled. Only 📊 structured stats feed the probability (each factor's contribution shown in %p); ⚔️🔮 are context to weigh. Predictions are locked and sealed before the game — verify the hits directly on the track record.