How do I recognize that my own piece is pinned and adjust my calculations accordingly?
These answers restate the rules implemented by our open-source engine, which follows the WXF laws and is regression-tested against the official 110-diagram repetition casebook. Where an answer refers to a specific position, that position lives on the linked reference page, where the build verifies it against the engine before publishing.
Direct answer
Before moving any piece, check what sits directly behind it on the same line: if moving that piece would expose your general to check, or would let your opponent win a more valuable piece behind it, that piece is pinned and effectively cannot move safely, no matter how good the move looks on its own.
Why this is easy to miss under pressure
A pinned piece often still looks like a perfectly normal, mobile piece on the board, and the pin only becomes obvious once you specifically check the line behind it. Players calculating quickly frequently plan a move for a pinned piece, only to realise mid-calculation that it actually loses material or allows check, at which point the whole plan needs revisiting.
How to adjust once you spot it
Treat a pinned piece as temporarily removed from your available options unless you are specifically planning to break the pin, either by moving the piece behind it, blocking the line, or capturing the pinning piece. Recalculate any combination that assumed the pinned piece could move freely, since that assumption is exactly what will get punished if it is wrong.
Related questions
Can a pinned piece still capture along the same line?
Yes, moving along the pin's own line is usually still safe; it is moving off that line that breaks the pin and exposes what is behind it.
Is being pinned always bad?
Usually, but not always; sometimes the pinned piece was not going anywhere useful anyway, so the practical cost is smaller than it looks.
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