GambitBlock: Chess Website Blocker

Turn a distracting tab into a short chess challenge. GambitBlock blocks the sites you choose and temporarily unlocks access after you solve a tactics puzzle or complete an opening line.

- Choose which websites to block.
- Practice tactics or opening moves, with adjustable difficulty.
- Set how long access stays unlocked and whether an unlock applies to one site or all blocked sites.
- Review your moves and the correct line after a challenge.
- Play with board coordinates, move highlights, sound, and a choice of promotion piece.

Core blocking and chess challenges work without an account. Optional GambitBlock Pro adds schedules, focus statistics, and hard mode. Pro requires an account and a paid subscription through gambitblock.app.

Website matching and chess challenges run locally. The extension contacts GambitBlock's account service when you use sign-in and subscription features.