The ChessOnline plugin allows you to display a chessboard and to set up positions (using the FEN). You can also use it as a PGN viewer (experimental).
Plugin Tag: chessboard
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Chess Game Viewer
The Chess Game Viewer Control Panel is the easiest way to add a customizable chess board to your blog.
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Embed Chessboard
Allows for the insertion of a chessboard displaying chess games within wordpress articles.
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RPB Chessboard
This plugin allows you to typeset and display chess diagrams and PGN-encoded chess games.