This is an English translation of the Korean privacy policy, provided for convenience. If the translation differs from the Korean original, the Korean version prevails. This policy is governed by the laws of the Republic of Korea.
Chess Vanguard (the “App”) is provided by eddykwonstudio (에디권스튜디오, the “Operator”). This policy explains what the App collects, why, and who it is shared with.
The App does not collect information that directly identifies you, such as your name, email, phone number or address. There is no sign-up, and online battles work with an anonymous identifier only.
1. Information we collect
1-1. Online battle information — only when you use online battles
An anonymous account is created automatically when you first open the online battle screen. If you only play single player, campaign, 2-player or the tutorial, this information is never created.
| Item | Details |
|---|---|
| Anonymous account ID (UID) | A random string issued by Firebase Authentication. Not linked to any email or phone number |
| Nickname | Generated automatically at first (e.g. Knight1234, or 기사1234 in Korean). You can change it |
| Battle record | Rating (ELO), number of wins and losses |
| Game data | Players’ UIDs and nicknames, game state, equipped skins, army setup, room code |
| My cards during a game | Your hand and deck. Kept in separate storage that only you can read and never shown to your opponent |
| Matchmaking queue data | UID, nickname and army setup created temporarily while matching (removed when a match is made or cancelled) |
Your nickname and rating are visible on the leaderboard and to your opponents. Please don’t use a name you don’t want to be public as your nickname.
1-2. Usage statistics (Firebase Analytics)
To improve the App and understand how content is used, we collect the following activity events. They do not include information that identifies individual users.
- App launches, screen views
- Game start and end (mode, win or loss)
- Tutorial completion, campaign stage clears
- Ad views, skin and theme purchases in the Shop (with in-game points)
Firebase also collects some items automatically: a pseudonymous app instance ID, device model, OS version, app version and approximate region (country level).
1-3. Ads (Google AdMob)
The App includes the Google AdMob SDK to provide the “Watch an ad for points” button (rewarded ads) in the Shop, on the battle result screen and on the home screen. To serve ads, limit how often they appear and prevent fraudulent clicks, Google processes your advertising ID (Android advertising ID) and device and network information. Ads are shown only when you press the button.
You can reset your advertising ID or turn off personalized ads at any time in your device settings: Settings → Privacy → Ads.
1-4. In-app purchases — only when you buy something
When you buy a paid item in the App (such as cosmetic items), Google Play processes the payment, and RevenueCat (RevenueCat, Inc.) verifies the purchase on our behalf.
| Item | Details |
|---|---|
| Data processed | Anonymous app user ID, purchased product ID, purchase and refund status, country, device and app information |
| Purpose | Confirming purchases, delivering purchased content, restoring purchases on a new device, applying refunds |
The Operator and the App do not collect or store payment details such as card or bank account numbers. Payment information is handled by Google.
If you don’t make a purchase, this information is never created.
1-5. Stored on your device only (never sent out)
The following stays on your device and is never sent to a server: sound, display and language settings, campaign progress, points, owned and equipped skins, themes, titles and frames, deck, army setup, daily login record, achievement progress and saved games in progress.
Deleting the App deletes this information too.
2. How we use information
We use the information we collect only for the following purposes.
- Matching online opponents and running online games
- Providing ratings, records and the leaderboard
- Finding app errors and improving game balance and content
- Providing rewarded ads
- Delivering and restoring in-app purchases
The App does not sell the information it collects.
3. Third-party processing
The App uses the following services, and information is processed within the scope below.
| Service | Data processed | Purpose |
|---|---|---|
| Firebase Authentication | Anonymous UID | Identifying online accounts |
| Cloud Firestore | Nickname, rating, record, game data | Online battles and leaderboard |
| Firebase Analytics | Usage events, device and app information | Usage statistics |
| Google AdMob | Advertising ID, device and network information | Serving ads |
| Google Play billing | Payment processing, purchase and refund history | In-app purchases |
| RevenueCat | Anonymous purchaser ID, purchased products and status | Verifying and restoring purchases |
- Google Privacy Policy: https://policies.google.com/privacy
- Firebase data processing: https://firebase.google.com/support/privacy
- How Google uses data in ads: https://policies.google.com/technologies/partner-sites
- RevenueCat Privacy Policy: https://www.revenuecat.com/privacy
Except as stated above, we do not provide information to third parties. However, we follow applicable law when there is a lawful request.
4. Retention
- Online account information (nickname, rating, record): kept until you ask us to delete it.
- Game data (including your cards during a game): deleted automatically 30 days after the game was created. If you ask before then, we delete it with your account.
- Matchmaking queue data: deleted when a match is made or cancelled.
- Purchase history: kept so you can keep using purchased content, and to meet the 5-year transaction record retention required by Korea’s Act on the Consumer Protection in Electronic Commerce.
- Usage statistics: follow Google Analytics’ default retention policy (up to 14 months).
- Information stored on your device: deleted when you delete the App.
5. Your rights — access and deletion requests
Because the App uses anonymous accounts, please include your in-app nickname with your request so we can find and handle the account.
- How to request: email “Account deletion request” and your nickname to the contact below.
- What we delete: your anonymous account, nickname, rating and record, and related game data. Purchase history remains for the legally required retention period (once deleted, we can no longer restore the content you bought).
- Timeframe: within 30 days after we confirm your request.
Information stored only on your device (progress, owned items, etc.) is erased immediately when you delete the App.
6. Children’s privacy
The App’s content is suitable for all ages (no blood or sexual content; content rating 3+).
The App includes rewarded ads and usage statistics, and the advertising ID described in section 1-3 is processed to serve ads. The App does not collect information that identifies anyone, including children, such as names or emails. Parents or guardians who want their child’s data deleted can contact us below.
7. Security
- Online data is stored in Google Cloud (Firestore), and data in transit is encrypted (TLS).
- Database security rules limit access — only you can edit your profile, only you can read your cards during a game, and only the players can change game data, each on their own turn. Ratings and records change only through the results of games actually played.
8. Changes to this policy
If this policy changes, we will post the changes and the effective date on this page. Important changes will also be announced with app updates.
9. Privacy officer and contact
Please contact us below for privacy questions, access or deletion requests. Including the app name (Chess Vanguard) helps us respond faster.
- Privacy officer
- 권광희 (KWANGHEE KWON), Representative of 에디권스튜디오 (eddykwonstudio)
- eddykwonstudio@gmail.com
10. Business information
Registered details are shown in the original Korean, with English in parentheses.
- Business name
- 에디권스튜디오 (eddykwonstudio)
- Representative
- 권광희 (KWANGHEE KWON)
- Business registration no.
- 687-12-02550
- Mail-order business no.
- 제2026-고양일산동-1794호 (2026-Goyang Ilsandong-1794)
- Address
- 경기도 고양시 일산동구 월드고양로 21, 301동 4204호 (장항동, 킨텍스원시티)
(301-4204, 21 World goyang-ro, Ilsandong-gu, Goyang-si, Gyeonggi-do, 10394, Republic of Korea) - Phone
- +82 10-3194-9255
- eddykwonstudio@gmail.com