# Background image credits

Every image here is **CC0 1.0 (public domain dedication)** by its author. No attribution is required;
it is recorded anyway for provenance. Licenses were checked on the source pages on 2026-10-09.
Files were cropped, scaled, (textures only) darkened/desaturated, and re-encoded for the web.

## hero-bokeh.jpg, phone-bokeh.jpg (1920x1280, 608x1080 crop)
- Title: "Chess" (bishop and pawn on a wooden board, shallow depth of field)
- Author: Romain Guy (Flickr: romainguy)
- Source page: https://www.flickr.com/photos/24046097@N00/230416692
- File used: https://live.staticflickr.com/95/230416692_50d339a7af_k.jpg (2048 px rendition)
- License: CC0 1.0 Universal Public Domain Dedication (https://creativecommons.org/publicdomain/zero/1.0/)
- Why credible: the CC0 dedication is set by the photographer on his own Flickr account (photo page license field); also indexed as CC0 by Openverse.

## hero-queen.jpg, phone-queen.jpg (1920x1280, 608x1080 crop)
- Title: "Queen chess" (black-and-white queen and its long shadow)
- Author: Stefano Bucciarelli (Flickr: stbuccia)
- Source page: https://commons.wikimedia.org/wiki/File:Queen_chess.jpg (original: https://www.flickr.com/photos/195502194@N03/52036271499/)
- File used: https://upload.wikimedia.org/wikipedia/commons/2/21/Queen_chess.jpg (via Commons thumbnail service)
- License: CC0 1.0 ({{cc-zero}})
- Why credible: author published it as CC0 on Flickr; Wikimedia Commons' FlickreviewR bot verified the CC0 license on the Flickr page (review 2023-07-25).

## texture-pieces.jpg (1280x853, darkened and desaturated)
- Title: "Wooden Chess Set" (heap of old wooden chess pieces)
- Author: Alan Levine (Flickr: cogdogblog)
- Source page: https://www.flickr.com/photos/37996646802@N01/4163089889
- File used: https://live.staticflickr.com/2523/4163089889_e18cb1f80c_h.jpg (1600 px rendition)
- License: CC0 1.0 Universal Public Domain Dedication
- Why credible: CC0 set by the photographer on his own Flickr account; the photo shows his own family chess set (per the photo description).

## texture-board.jpg (800x800, seamless 4x4-square tile, darkened)
- Title: "Chess game Staunton No. 6 top view" (crop of the empty middle of a mahogany/sycamore board)
- Author: Wilfredor (Wilfredo Rodriguez), Wikimedia Commons
- Source page: https://commons.wikimedia.org/wiki/File:Chess_game_Staunton_No._6_top_view.jpg
- File used: https://upload.wikimedia.org/wikipedia/commons/7/70/Chess_game_Staunton_No._6_top_view.jpg (via Commons thumbnail service)
- License: CC0 1.0 ({{self|cc-zero}})
- Why credible: uploader's own work ({{own}}) explicitly released under CC0 by the photographer on Commons. The crop contains only plain board squares (no pieces, no logos or text).

## social-preview.png (1200x630, Open Graph / Twitter card)
- Our own art: the ChessBid logo (`web/icon.svg`: our classic knight + a star), our classic piece set (`web/pieces/`), board colours and text drawn in HTML and rendered with headless Edge. No third-party images or fonts (system font).