106 real-game puzzles in this collection
What is a en passant?
These puzzles hinge on the en passant capture — taking a pawn that just advanced two squares as if it had moved one. The special rule opens lines and removes shelter at exactly the right moment.
How to spot it
After any two-square pawn advance beside your pawn, ask what the en passant capture opens: a file toward the king, a diagonal for your bishop or a promotion path.
What this set trains
Rule-perfect calculation practice — en passant is legal for one move only, so timing is everything.
Developing: 4Challenging: 31Advanced: 71