I’m an 1800 player on Lichess and struggle making the same types of mistakes over and over again. Lichess has a nice feature called “Learn from your mistakes” available after you request a computer analysis. I wanted something a little more so I built Mistake Trainer with Claude Code.

It expands “Learn from your mistakes” to all your computer analyzed games and adds spaced repetition with the UI ported from lila so it feels like y̶o̶u̶’̶r̶e̶ b̶a̶t̶m̶a̶n̶ playing on Lichess. If you don’t play on Lichess, or don’t want to use your own account at first, there is a sample deck included so you can check it out.

There is also the option to use your own computer analysis to create cards from all of your Lichess games, not just the ones analyzed on Lichess’s servers. If you have lots of games, I recommend using your own computer to download the app so you have access to a better engine.

Other features included: suspending cards (positions) you don’t like, choosing if you want to focus on opening mistakes vs mistakes where your position collapsed, toggling your previous move arrow (this was a nitpicky one for me). Crucially, you can adjust how long a delay before you see a card again. I found somewhere between a 5 to 7 day delay was helpful to prevent just superficially recognizing a solution.

Similar tools that already exist include Aimchess and github.com/antimike/chess_trainer. I have the greatest respect for Lichess, and tried to build a tool that feels like a natural extension of their wonderful service.

Mistake Trainer is free, open source, and has no server to see your data (it stays on your computer). I hope you find it helpful in improving your chess!

https://github.com/DannyNagelMath/Mistake-Trainer

Internet rallies behind Red Baron worker who snapped at Instagram prankster

Astra Held Its Ground (Truth)

Oh captain, our captain: Ars staff remembers Patrick Stewart

Hackers send fake nuclear threat alert to Ukraine emergency app

WCAG 3: a different future for accessibility

Show HN: HackerTube for Apple TV. Videos HN Recommends, on Your TV

Never Complain, Never Explain

CheerpJ 5.0: Java 21/25 in the browser, full OpenJDK, and a new WasmGC engine

Supermarket freezers across Europe hit by second suspected cyber-attack

Guidelines and Guardrails Belong in Git

Supermarket freezers in Belgium and Sweden hit by suspected cyber-attack

Ukraine, Russia Hit by Hacks Sending Fake Nuclear Attack Alerts

I used Claude to build and ship Oriel – a free, native-feeling macOS notch app

Second cyberattack heats EU supermarket freezers to 50°C, destroying food

One possible future for websites is gated communities

Toward the Self-Driving Computer

A Powerful Mosquito-Hunting Laser Uses A.I. To Zap Winged Pests

Show HN: Disable ACR on Sony Bravia TV's Without Rooting

How hard is it to check for whitespace?

Binance Clone App Development Cost for Mobile Exchange Platforms

Hatamoto is Apache 2.0 thanks to Ubuntu Shipit Programme

Feynman's Messenger Lectures

KITP Program: Intermediate-Scale AI for Physics

How Wikipedia Rewrote Zionism

Show HN: HackerTube for Apple TV. Videos HN Recommends, on Your TV

UK Business Births and Deaths

RFC 1149: Standard for the transmission of IP datagrams on avian carriers

Show HN: Sortaballs – alternative modes for classic sort ball puzzle

The future in old computer magazines (1984–2004)

Show HN: Mistake Trainer – Spaced repetition from your own Lichess games

Show HN: HackerTube for Apple TV. Videos HN Recommends, on Your TV

Comments

Internet rallies behind Red Baron worker who snapped at Instagram prankster

Astra Held Its Ground (Truth)

Oh captain, our captain: Ars staff remembers Patrick Stewart

Hackers send fake nuclear threat alert to Ukraine emergency app

WCAG 3: a different future for accessibility

Show HN: HackerTube for Apple TV. Videos HN Recommends, on Your TV

Never Complain, Never Explain

CheerpJ 5.0: Java 21/25 in the browser, full OpenJDK, and a new WasmGC engine

Supermarket freezers across Europe hit by second suspected cyber-attack

Guidelines and Guardrails Belong in Git

Supermarket freezers in Belgium and Sweden hit by suspected cyber-attack

Ukraine, Russia Hit by Hacks Sending Fake Nuclear Attack Alerts

I used Claude to build and ship Oriel – a free, native-feeling macOS notch app

Second cyberattack heats EU supermarket freezers to 50°C, destroying food

One possible future for websites is gated communities

Toward the Self-Driving Computer

A Powerful Mosquito-Hunting Laser Uses A.I. To Zap Winged Pests

Show HN: Disable ACR on Sony Bravia TV's Without Rooting

How hard is it to check for whitespace?

Binance Clone App Development Cost for Mobile Exchange Platforms

Hatamoto is Apache 2.0 thanks to Ubuntu Shipit Programme

Feynman's Messenger Lectures

KITP Program: Intermediate-Scale AI for Physics

How Wikipedia Rewrote Zionism

Show HN: HackerTube for Apple TV. Videos HN Recommends, on Your TV

UK Business Births and Deaths

RFC 1149: Standard for the transmission of IP datagrams on avian carriers

Show HN: Sortaballs – alternative modes for classic sort ball puzzle

The future in old computer magazines (1984–2004)

Show HN: Mistake Trainer – Spaced repetition from your own Lichess games