Privacy Policy
Last updated 1 September 2026
Chess by Receipt lets two people play correspondence chess by text message and, if they have one, by thermal receipt printer. This policy describes what we hold, why, and what we will never do with it.
Chess by Receipt is operated by Zachary Coffin.
What we collect
- Your mobile number. It is how the service knows who you are. There are no accounts and no passwords.
- A display name, if you give one, so your opponent sees something other than a phone number.
- Your games — the moves you send, and the times you sent them.
- Your preferences — slip style, board style, quiet hours, and which channels you want to receive.
- Your printer, if you claim one: an internal identifier linking a machine to your number.
We do not collect your location, your contacts, or anything from your device. We do not use cookies for tracking, and there is no analytics or advertising code on this site.
We do not share your mobile number
We do not share, sell, or provide your mobile phone number or messaging consent data to third parties or affiliates for marketing or promotional purposes. No mobile information is sold, rented, or shared with third parties or affiliates for marketing or promotional purposes, and we do not disclose the contents of your messages to anyone.
The single exception is delivery: to send you a text at all, your number and the message are passed to our messaging provider, Twilio, and onward to your mobile carrier. They handle it only to deliver the message. Nobody receives your number for their own marketing.
Your opponent sees your display name and your moves. They do not see your phone number.
Message frequency
Message frequency varies with how you play. The service replies when you text it, and messages you when it is your move and your printer cannot be reached. A typical game sends a few messages per week. Reminders when a clock is running low can be turned off in your settings.
Message and data rates
Message and data rates may apply. Your mobile carrier's normal charges apply to messages you send and receive.
Stopping messages
Reply STOP at any time to stop all messages. Reply HELP for help. You can also change or switch off each kind of message in your settings.
How you opt in
You join by texting JOIN to our number from your own phone. That text is your consent to receive messages about your games. Nobody else can sign your number up: an invitation from another player gives them a code to pass to you, and nothing is sent to you until you text it in yourself.
Message frequency varies. Message and data rates may apply. Reply STOP to cancel, HELP for help. Consent to receive messages is not a condition of any purchase.
How long we keep it
Games are kept while they are being played, and afterwards as a record of the finished game. Preferences are kept until you change them. Ask us to delete your data and we will remove your number, your games and your preferences.
Where it is held
Your data is stored on a single private server, not shared with other services, and is not transferred to anyone for their own use.
Children
This service is not directed at children under 13, and we do not knowingly collect their information.
Changes
If this policy changes in a way that affects how your information is used, the date above will change.
Contact
Questions, or a request to delete your data: mailto:coffinzm@gmail.com