Differential = (Score − Course Rating) for simplicity. Index = average of your 8 best differentials.
How this was built
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Plain-English prompts, in order — exactly what you'd say to Claude to build Golf handicap. No code, no jargon. The host coaches the wording; the executive types.
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Notice the storage step is its own prompt — that's the moment the app starts to remember. See all apps' prompts →