D4Chess.Club — AI chess coach that finds your mistake patterns, not just your blunders

Hey Product Hunt! Shane here, solo founder of D4Chess.Club.

I built this because I kept hitting the same wall every club-level chess player hits: I knew I was making mistakes, but no tool could tell me which mistakes I kept repeating — or why. Chess.com has 200M users and endless puzzles. Lichess is free and incredible. Neither one sits down with you after a game and says "here's your pattern, here's how to fix it."

So I built that tool. D4Chess.Club analyzes your game history, surfaces your recurring error patterns, and coaches you through them with AI-powered walkthroughs — Socratic-style, not just "the computer plays Nf6 here."

A few things I'd genuinely love feedback on:

• If you play chess: What's the one thing about your game you've never been able to fix? Does this solve it?

• If you don't play chess: Is the coin-based access model (no subscription required to try AI features) low enough friction to get you to try it?

• For the chess community specifically: What would make you recommend this to a friend over just pointing them to Lichess?

I've been building and shipping solo for 8 weeks. Still finding rough edges — tell me what you find.

Happy to answer anything. 🙏