Jackhammer
Recognize more tactics in your games.
Practice the same chess puzzles over several days. Learn why each move works, then see whether you can solve them more accurately and in less time.
Your first set is free
The method
A simple way to practice.
Choose your puzzles
Start with a small, easy set. Choose a mix of puzzles or a theme you want to practice.
Learn the solutions
Work through the set at your own pace. Pause anytime; your progress is saved.
Come back and repeat
Try the same set another day. Aim for fewer mistakes first, then faster solves.
FAQ
Jackhammer questions
What is Jackhammer?
Jackhammer helps you practice chess tactics by returning to the same puzzles. Create a puzzle set, learn the solutions, then repeat it after a break to see whether you solve more accurately and in less time.
What are sets and rounds?
A set is your collection of puzzles. A round is one pass through that collection. For example, 10 puzzles with 3 rounds means solving those same 10 puzzles three times. These were previously called batches and cycles.
When should I repeat a set?
Try returning the next day. You can spread a round across several sessions—pause whenever you need. Focus on understanding each solution before trying to get faster.
How do I read my results?
First-try accuracy shows how often you solved without a wrong move; skipped puzzles count as incorrect. Time saved compares your latest completed round with your first. Review missed puzzles, and use theme results as ideas for your next set. These results are not a chess rating.
Do I need Lichess or Pro?
Connecting Lichess is optional. It lets Chess67 suggest difficulty from your puzzle rating. Free accounts can try one set of up to 50 puzzles for one round. Pro adds more sets, larger sets, and repeated rounds.
Ready to practice?