What has been tested

Corpus

Public, peer-reviewed match-event dataset, licensed CC BY 4.0. Full citation.

Season

2017/18

Scored coverage

Five European leagues

Players scored

1,904

Systems scored

98

Scored pairs

186,592

Stated as

A season archive. Never a live feed.

Coverage as of August 2026.

The value layer was trained on one league and tested on a league it had never seen.

The value layer carries across competitions. It is not fitted to one league.

The value layer is a published action-value model, trained here on the public corpus above. It is the floor the engine reads from, not the engine. It is stated because anyone holding the same public data can check it. The scoring above it is not described.

• It does not compare athletes across roles that are asked for different things.
• It does not estimate what it cannot observe. Off-ball movement needs a tracking feed, and is shown as absent rather than guessed.
• It does not print a numeric score beside a named athlete in public.
• It does not predict injuries. It is not a scouting database.

A blank is a real output.

Record

On-ball only. What happens off the ball needs a tracking feed the engine does not yet read.

Season depth

One season. Every read is a comparative static, not a forecast.

Currency

A season archive. It is not connected to a live feed.

What would move this

Multi-season outcome data, and a tracking feed.

The following exist, and are open to a technical reviewer under confidentiality.

• 01Verification protocol in full
• 02Feature-group ablation on the value layer
• 03Calibration methodology
• 04Adverse results in full
• 05Live demonstrator access

Access is by introduction