The Blunder Vault
Never make the same tactical mistake twice. Missed puzzles from Daily, Rush, Streak, and Realms are automatically archived and scheduled for spaced repetition review.
The Blunder Vault
Your Vault is Clean!
You have completed all scheduled spaced repetition reviews for today. Great tactical retention!
The Science of Spaced Repetition in Chess
Research in cognitive science demonstrates that active recall at expanding intervals (the spacing effect) converts short-term tactical calculations into permanent intuitive pattern recognition. When you fail a puzzle, your brain forms a weak synaptic pathway. By re-solving the exact position at 1-day, 3-day, and 7-day intervals, you turn blind spots into automatic reflexes.
1. Automatic Capture
Every mistake in any puzzle mode is instantly vaulted with its failure reason.
2. 1-3-7 Day Intervals
Positions graduate to higher boxes on clean solves; mistakes reset to Box 1.
3. Pattern Mastery
Solving in Box 3 marks the tactic as Permanently Mastered with permanent XP rewards.