Day 20 · Week 03 · Pins, Skewers & Discoveries
Line-Tactic Bootcamp
Pressure-test pins, skewers, discoveries and open-line combinations without labels.
This bootcamp removes motif cues. Every position contains a line relationship, but the correct move may exploit it, break it, or ignore it for a stronger forcing move. The student must inspect files, ranks and diagonals before moving.
Training flow: 1. 6-position recognition sprint. 2. 6-position calculation set. 3. 4 defensive line-tactic positions. 4. 4 mixed no-label positions. 5. Error review.
Common errors: Motif guessing. Missing interposition. Failure to update line after exchanges. Moving too quickly because the line looks familiar.
Mastery gate: 16/20 correct and no repeated legality error.
Review: Update error log by line type: file, rank, diagonal, hidden line.
Duration: 75–95 min
The knight is pinned to the king. Take it.
LESSON · difficulty 3 · capture/pin · 0s · attempts 0 · hints 0
Qxa6 captures the knight. The knight is pinned to the king on the same line, and it is the only free capture.
The knight is pinned to the king. Take it.
PUZZLE · difficulty 3 · capture/pin · 0s · attempts 0 · hints 0
The knight is pinned to the king. Take it.
PUZZLE · difficulty 3 · capture/pin · 0s · attempts 0 · hints 0
Find the skewer.
PUZZLE · difficulty 3 · skewer/check · 0s · attempts 0 · hints 0
Find the skewer.
PUZZLE · difficulty 3 · skewer/check · 0s · attempts 0 · hints 0
Find the skewer.
PUZZLE · difficulty 3 · skewer/check · 0s · attempts 0 · hints 0
Which move discovers check from the rook?
PUZZLE · difficulty 3 · check/discovered · 0s · attempts 0 · hints 0
Which move discovers check from the rook?
PUZZLE · difficulty 3 · check/discovered · 0s · attempts 0 · hints 0
Which move discovers check from the rook?
PUZZLE · difficulty 3 · check/discovered · 0s · attempts 0 · hints 0
Find the best move.
PUZZLE · difficulty 3 · check/mate · 0s · attempts 0 · hints 0
Find the checkmate.
PUZZLE · difficulty 3 · check/mate · 0s · attempts 0 · hints 0
Use the open file against the king.
PUZZLE · difficulty 3 · king safety/open file · 0s · attempts 0 · hints 0
You are in check. Find the move that keeps the most material.
PUZZLE · difficulty 3 · defense/check · 0s · attempts 0 · hints 0
You are in check. Find the move that keeps the most material.
PUZZLE · difficulty 3 · defense/check · 0s · attempts 0 · hints 0
There is no winning tactic. Find the quiet move that holds.
PUZZLE · difficulty 3 · quiet move/no tactic · 0s · attempts 0 · hints 0
There is no winning tactic. Find the quiet move that holds.
PUZZLE · difficulty 3 · quiet move/no tactic · 0s · attempts 0 · hints 0
Your loose piece is attacked. Save it.
PUZZLE · difficulty 3 · loose piece/save · 0s · attempts 0 · hints 0
Find the knight check that also attacks the queen.
PUZZLE · difficulty 3 · fork/knight-queen · 0s · attempts 0 · hints 0
Take the one loose piece.
PUZZLE · difficulty 3 · loose piece/recognition · 0s · attempts 0 · hints 0
Find the best move.
MASTER_CHALLENGE · difficulty 3 · 0s · attempts 0 · hints 0
Hints are off in this mode.Not enough data yet.