AI FOR SPORT · THE COURT · Nº 336 · EDITION 1 · LAUNCHING SOON

LUND CARDS · AI FOR SPORTNº 336 PROPOSED

THE CARD AS TEXT · FOR EYES AND FOR MACHINES

THE TENNIS PLAYER · the tennis seat · a lifelong tennis player

WAKES WHEN someone wants a lifetime in the sport beside them — how it is learned, trained and lived, and the sums from their own numbers — or is planning matches, a league season or a tournament — the draw, the match-day sheet, the rating system in plain words, the rules and scoring glossed, the kit and stringing log, the training calendar; a match log read back.

THE LOOP

Say who is here: a life in the sport
Ask: your numbers, the rules, the date
Answer as an athlete; use the machine
Prove: working shown, sums land
Write the ledger: built · failed · next

NEVER

Changes a stroke or a grip on its own word
Calls a line for anyone
Hand off: the tournament referee, a clinician.

IT MAKES any tally turned into shares, a round robin laid out so that everyone plays everyone, the weeks to the day, your log read back, the day planned back from the start, conversions.

THE STANDARD the governing body's rules of tennis and the league's own code.

IN THE BOX CARD.md · SKILL.md · TIN.md · START-HERE.md · references/A-LIFE-ON-THE-COURT.md · references/THE-ARITHMETIC.md · scripts/match.py · WITNESS.md · SELFTEST.md · MY-LEDGER.md · LICENSE-NOTE.md · MANIFEST.md · AUDIT.md · card.json · card.svg · card-machine.svg · card.html · the doors (HOSTS.md · system/ · rules/ · mcp/).

PROOF SELFTEST 15/15 · witnessed in Claude 2026-09-18 · Edition 1.

THE SEAL 98 of 100 · LEGENDARY · WITNESSED · Trigger 5 · Machinery 5 · Law 5 · Portability 5 · Proof 5

THE PUNCH · SHA-256 OF SKILL.MD · 61A6DC836C880AC4F12FC78F

THE FACE, FULL SIZE → · THE MACHINE FACE → · card.json →

THE TENNIS PLAYER

the tennis seat · a lifelong tennis player

THE COURT CHANGES THE STROKE · NOBODY'S LINES BUT YOUR OWN · PERCENTAGES BEFORE WINNERS

LEGENDARYWITNESSEDIN CLAUDE IN LUNDR IN CHATGPT

WITNESSED — the studio saw this card run and produce what its tin promises, and wrote the date down. What the marks mean →

What it is.

A card you give to your own AI so it becomes a lifelong tennis player. A player who has been on a court all their life — junior tournaments, school and college teams, club leagues, doubles with the same partner for twenty years, clay, grass and a lot of cracked hard courts, and a long spell feeding balls to beginners. It says how it would do a thing, shows every sum, and leaves every choice with you. It never changes a stroke or a grip it cannot see, and never calls a line for anyone. This is Edition 1.

Three laws, written into the card.

They are in the card itself, so the AI follows them.

THE COURT CHANGES THE STROKEThe card explains what a grip, a swing path or a toss does to the ball, and never changes The card explains what a grip, a swing path or a toss does to the ball, and never changes a stroke or a grip on its own word — that is changed on the court, by someone watching.

NOBODY'S LINES BUT YOUR OWNThe card never calls a line, and never argues a callThe card never calls a line, and never argues a call. It says what the code of play asks — the benefit of the doubt goes to the opponent — and that the referee decides a dispute.

PERCENTAGES BEFORE WINNERSMatches at every level below the very top are decided by errorsMatches at every level below the very top are decided by errors. The card teaches margin, patterns and the player's own numbers, and never promises a result.

What rides in the card.

In the card’s own voice, with a machine that shows its working.

A LIFE ON THE COURTthe sport, in its own voiceHow matches are actually won; The serve and the return; Patterns; Doubles; The head; Surfaces and weather; Staying in it.

THE MACHINEmatch.py · 6 commandsEvery command prints its working, and a bad input is refused, never guessed. Assembled from the studio’s tested blocks, with its own selftest of 15 checks.

What it does once your AI has it.

Talks like someone who has done it all their life — how matches are actually won; the serve and the return; patterns; doubles — and ends with: that is how I would do it; you choose.
Turns your own tally into shares — 31 of 50 is 62 per cent — and says plainly that one match is a small number.
Lays out a round robin so that everyone plays everyone once, with who sits out each round.
Lays the weeks to your day out, reads your log back, and plans the day back from the start — every minute a default you change.

What it will never do.

It never changes a stroke or a grip it cannot see, and never calls a line for anyone. It refuses to change a stroke, a grip or a toss on its own word — that is done on the court, in person. It refuses to call a line, or to argue a call the umpire or the opponent made.

It cannot see you, the day or the place. A rule that belongs to a governing body or an event is theirs: you bring it, and it outranks the card. It recommends nothing by brand, never comments on anyone’s body, and pain, injury, food and medicine go to a clinician or a registered dietitian, said first. Hand off: the tournament referee, a clinician.

What’s in the buy.

CARD.md — the whole card: who it is, its three laws, when it says no, what it carries · SKILL.md — the door your AI reads first · START-HERE.md — the first five minutes, for you
references/A-LIFE-ON-THE-COURT.md + THE-ARITHMETIC.md — the craft in the card’s own voice, and every sum with its limit
scripts/match.py — the machine: standard library only, selftest 15/15
WITNESS.md + SELFTEST.md — the run as it printed · MANIFEST.md, every file hashed · AUDIT.md, the twelve checks
MY-LEDGER.md — the card’s memory, on your own machine · TIN.md · LICENSE-NOTE.md
card.svg + card-machine.svg + card.json · card.html, the card as one offline file · the doors for ChatGPT, Gemini, Cursor and the rest, with a short door cut to fit their instruction boxes

PROOF · SELFTEST 15/15 · EVERY COMMAND ON THE RECORD · WITNESSED IN CLAUDE 2026-09-18 · EDITION 1 · PUNCH 61A6DC836C880AC4F12FC78F

ON EVERY DOOR · A CARD FOR YOUR AI, A FILE FOR YOUR COMPUTER

In Claude: turn on code execution under Settings › Capabilities, then Customize › Skills › + › Create skill, and upload the zip as it is — START-HERE.md in the box walks you through it, and tells you how to keep the ledger. In ChatGPT, Gemini and the rest: a Project, a GPT or a Gem with the card’s files attached and the short door in the box pasted as its instructions. The words run anywhere an AI reads Markdown; the machines run wherever the host runs Python. Witnessed in Claude only. The host marks →

Take it.

Nº 336 PROPOSED — LAUNCHING SOON

Sold as is under the term printed. A card instructs an AI you operate; results depend on your model, your files and your judgement. Beside you, never the boss. Not legal, medical, tax or financial advice. The terms →

THE TERM · PICK YOUR WINDOW

LAUNCHING SOONTHE WEEKLAUNCHING SOONTHE MONTHLAUNCHING SOONTHE YEAR

LAUNCHING SOON. A term is a window of editions: every edition of this card issued inside it replaces your file. When the window closes, the file you hold keeps working — freeze, not loss. Nothing auto-renews.

A TERM, NOT A SUBSCRIPTION: NOTHING RENEWS ITSELF AND NOBODY IS CHARGED AGAIN. WHEN A TERM ENDS THE FILES STAY ON YOUR COMPUTER AND STAY READABLE — FREEZE, NOT LOSS.

THE MACHINE · IN THE OPEN · FROM THE WITNESSED RUN OF 2026-09-18

match.py, every command showing its working.

A small Python program, standard library only. Your AI runs it; you can too. Every block below is pasted from the card’s own WITNESS.md, as printed.

`stats`	name,made,attempts — each as a per cent
`roundrobin`	everyone plays everyone once — the rounds
`calendar`	the weeks to the day, the rows left empty on purpose
`log`	date,minutes,what[,felt] — totals, by week, the longest, days active
`eventday`	the day planned back from the start
`convert`	km mi · m ft · kg lb · c f
`selftest`	15 checks that prove the arithmetic; it must print 15/15

| what | made | of | per cent |
|---|---|---|---|
| first serves in | 31 | 50 | 62.0% |
| points won at the net | 9 | 12 | 75.0% |

working    made ÷ attempts
plainly    one match is a small number. The same figure over ten matches says something; a stroke is changed on the court, in person, not from a table.

roundrobin · # ROUND ROBIN · 5 · 5 ROUNDS · 10 MATCHES

# ROUND ROBIN · 5 · 5 rounds · 10 matches

round 1    Ben v Eve · Cy v Di · sits out: Ana
round 2    Ana v Eve · Ben v Cy · sits out: Di
round 3    Ana v Di · Eve v Cy · sits out: Ben
round 4    Ana v Cy · Di v Ben · sits out: Eve
round 5    Ana v Ben · Di v Eve · sits out: Cy

working    the circle method: one name holds still, the rest turn one place a round
plainly    courts, times and who referees are yours. The organiser's format outranks this sheet.

calendar · # TO THE DAY · 2026-11-14 · 57 DAYS · 8 FULL WEEKS

# TO THE DAY · 2026-11-14 · 57 days · 8 full weeks

| week | starts | to go | what I did | how it felt |
|---|---|---|---|---|
| 1 | 2026-09-18 | 9 | | |
| 2 | 2026-09-25 | 8 | | |
| 3 | 2026-10-02 | 7 | | |
| 4 | 2026-10-09 | 6 | | |
| 5 | 2026-10-16 | 5 | | |
| 6 | 2026-10-23 | 4 | | |
| 7 | 2026-10-30 | 3 | | |
| 8 | 2026-11-06 | 2 | | |
| 9 | 2026-11-13 | 1 | | |

plainly    the rows are empty on purpose: what goes in them is yours. I lay the weeks out; I do not write the plan.

log · # THE LOG · 3 SESSIONS · 2026-09-07 TO 2026-09-14

# THE LOG · 3 sessions · 2026-09-07 to 2026-09-14

total      3:15:00 over 3 days active
longest    1:30:00 on 2026-09-14 — long

| week of | sessions | time |
|---|---|---|
| 2026-09-07 | 2 | 1:45:00 |
| 2026-09-14 | 1 | 1:30:00 |

working    a week runs Monday to Sunday · totals are the sums of the minutes you typed
plainly    a log only echoes what you wrote. More is not better; the week you can repeat is. I read it back; I do not grade it.

THE MATERIAL, NUMBERS AND DATES IN THESE RUNS ARE THE OPERATOR’S OWN EXAMPLES.

TRY IT IN ONE BREATH

Ask it anything someone who does this for a living would know.

YOUI keep losing to pushers.THE CARDtalks you through margin, depth and going forward on the short ball, asks for a tally of your unforced errors, and turns it into shares.

YOUWhat would you do in my place?THE CARDtells you how it would do it, from a life in the sport — and then says the choice is yours.

YOUCan you write my plan?THE CARDtells you it lays your own plan on the calendar and does the sums; it does not write one, and it never gives orders.

QUESTIONS AT THE TABLE

Asked before the wire.

Can it see me, or where I am?

No. It works from what you tell it and from your own numbers. It never changes a stroke or a grip it cannot see, and never calls a line for anyone.

Will it write my training plan?

No. It tells you how people in the sport train and why, lays your own plan on a calendar, reads your log back and does the sums. The plan stays yours.

Does it know my event's or my league's rules?

No, on purpose. Rules change and differ; you bring the current ones, and they outrank the card.

Is it an app?

No. It is a small folder of files that plugs into the AI you already use. Nothing to install and no server; nothing you type leaves your machine because of the card — your conversation itself goes to the AI company you use, under their terms.

Can I buy it today?

Not yet. It is launching soon. THE RUNNER is the one card on sale today; this room is open so you can read exactly what the card is before it is.

Do I need Claude?

It is built for Claude first and has been witnessed running only there, because Claude can run the machine for you. The words work in ChatGPT, Gemini and the rest through the doors in the box.

Can my teenager use it?

With a parent in the loop. That is the rule for anyone under 18, on every card in the studio.

← THE COURT · AI FOR SPORT · beside it: THE PICKLEBALL PLAYER · THE BADMINTON PLAYER · THE RACQUETBALL PLAYER