Plum Chess is built around one uncompromising idea: fair play. Real ratings. Honest competition. A platform where winning actually means something.
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What makes us different
Every platform has chess. Only Plum Chess is built from the ground up to keep it honest.
Your rating reflects your skill, not your engine's. Every game is analyzed post-match. Suspicious games are flagged before ratings update.
Every game is compared against Stockfish. Engine similarity scores, timing patterns, and accuracy spikes are logged automatically.
Fast, reliable real-time games with clocks, move history, and post-game analysis. Built for competitive play from day one.
Premium competitive mode with optional webcam verification and screen recording. For players who want no doubt about who won.
Honor points earned through fair play, not just winning. Your reputation follows you. Bad actors lose access to ranked play.
Designed for chess clubs, school programs, and tournaments. Admin tools, verified student accounts, and clean moderation built in.
The technology
We don't just detect cheating after it happens. We make cheating structurally unrewarding.
The honor system
Your honor score is separate from your rating. It reflects how you play — not just whether you win. It unlocks access to higher tiers of competition.
New to Plum Chess. Building your record. Access to casual games and the community.
Established fair player. Access to ranked games and official rating tracking.
Trusted competitor. Access to tournaments, leagues, and verified competitive play.
Elite fair player. Invitation-only events, coaching access, and a permanent verified badge.
Join the waitlist. We're opening to founding members first — the players who care most about keeping the game honest.
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