/pieces/wK.svg and the other colour/piece combinations. Upstream attribution.Google Analytics (G-Y2MHVSVHRB) measures visits, successful worksheet generation and requests to print worksheets or answers only after you accept optional analytics. These product events include only the puzzle count, not the positions or selected themes. A print request does not confirm that anything was physically printed. Google may set analytics cookies; advertising features are disabled. We do not send PGNs, chess usernames or analysis results as analytics events. Use Analytics settings to change your choice. Your preference is stored locally. No account system is used. Uploaded PGNs are not saved. Pasted/uploaded games and computed results stay in browser memory until the page is closed or refreshed. Username imports send that username to Lichess to fetch public completed games, directly or via our server relay. The relay holds the public export only while serving the request, does not retain the games, and temporarily remembers usernames for a one-minute rate limit. Hosting access logs may contain the requested username. The local engine downloads from this site only when analysis is started. QR codes and links send the printed position to Lichess when opened; Lichess’s own terms apply. Ordinary hosting access logs may exist.
DeepBlunder is not affiliated with or endorsed by Lichess, Chess.com, or Stockfish. Puzzle ratings are Lichess puzzle ratings, not estimates of player skill. Personal-game exercises are not assigned ratings or guaranteed to have a single best solution.
Successful public-game imports are stored only in your browser tab until it closes and reused for five minutes, including across refreshes. Rate-limit cooldowns are also remembered in that tab. This does not store uploaded PGNs on our server.