Hey Product Hunt! 👋

I got better at solving chess puzzles. Somehow, I didn't get better at chess.

I was doing everything you're supposed to do. Solving puzzles, watching opening videos, playing way too much blitz.

My puzzle rating kept climbing. My actual chess rating? Not so much.

And every time I analyzed a game, Stockfish would happily tell me where I messed up. But not why I kept making the same mistakes over and over.

That's what got me building Zugzwang.

Instead of just telling you which moves were bad, it looks across your games to figure out what's actually holding you back.

Import your games, let Stockfish analyze them in your browser, and get a training plan built around your recurring mistakes. Not random puzzles, but things you actually need to work on.

I ended up adding a few other things along the way:

♟️ Daily puzzles that get harder throughout the week, with streaks and a leaderboard

🧬 Chess DNA that breaks down your playing style into four traits and gives you a player type

🤝 Play a friend with a simple link, then analyze the game together

🗳️ Community positions where you can vote on what you'd play in someone else's game

And the part I really wanted to get right:

It's free. No ads. No account required. Your games stay in your browser.

I've spent a lot of time building this, but there's only so much you can figure out testing your own project.

So I'd genuinely love to know:

Does it actually identify the things you struggle with?
Is anything confusing when you first try it?
Would you use something like this more than once?

Even if you don't play chess, I'd love to hear what you think of the site itself.

I'll be around answering comments. Thanks for checking it out!