Seemingly defended landing
A seemingly defended landing is a candidate move that puts a piece on a square a pinned friendly piece defends. The square looks covered. The protector cannot leave the pin.
Why you should notice it
The piece may have a defender on the board. If that defender is pinned to a piece behind it, the protection fails when the piece is taken. Another real defender does not make the pin irrelevant.
When to check it
This is a blunder check. A purple arrow shows the candidate. The board stays on the current position. Ask: after that piece lands, is any defender of the square pinned? You also train the opponent’s move the same way. King moves never count.
Pinned defender is a different job: that scan lists pieces that only look safe in the position now. This check asks whether *this move* lands on a square one of those pins defends. Moving to an undefended square is the case with no defender at all.
Why players miss it during games
The defender is still there, so the landing square looks safe. The pin is easy to skip when you are already committed to the move.
How WayChess trains it
You draw every pin whose pinned piece defends the landing square, from the pinning piece to the piece behind the defender, without playing the move, then get feedback. If none qualify, you submit with no arrows.
Related checks
Pinned defender lists pieces whose only protection is a pin. Moving to an undefended square is the landing with zero defenders.
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