pgn4web help

The user can interact with the pgn4web chessboard using the keyboard or clicking chessboard squares; hovering the mouse on each square displays an help summary.

A search tool allows searching within the PGN games.

Errors alert messages are logged, such as failures to load PGN games, incorrect PGN games or incorrect FEN strings. When an error is encountered, the top left chessboard square will flash to signal the exception. The error alert log can be reviewed clicking on the same top left chessboard square.
The user can interact with the pgn4web chessboard using the keyboard (see the pgn4web wiki for some examples):
The user can interact with the pgn4web chessboard clicking chessboard squares:

For full details about the search tool (implemented as regular expression match of the text of the PGN game), please refer to the pgn4web wiki; please find below a sample list of useful search patterns:

pgn4web supports chess annotations symbols as defined by the Chess Informant publishing company: Technical note: Chess Informant symbols display requires a modern browser supporting web fonts, otherwise the game notation might result garbled.
Javascript modifications of Paolo Casaschi on code from the ficsgames database, in turn likely based on code from the LT PGN viewer.

PNG images from Eric De Mund, licensed under creative commons attribution-share alike 3.0 unported license.
SVG images from Colin M.L. Burnett, licensed under GFDL, CC-BY-SA-3.0 or GPL, via Wikimedia Commons.

The figurine fonts are derived from the Liberation Sans font released under GNU General Public License, with the addition of chess pieces from freeware fonts: the alpha2 font (Peter Strickland), the good companion font (David L. Brown), the merida font (Armando H. Marroquin), the pirate font (Klaus Wolf) and the chess usual font (Armando H. Marroquin). The original chess fonts and more details are available at the en passant site. The chess informant symbols font is used with permission from the Chess Informant publishing company. The chess ole figurin font is from the ChessOLE project (David Frank).

Some functionality of specific applications of pgn4web or specific demo pages depends on third party javascript libraries, each stored in a separate subfolder with the associated credits and license information.

Remaining pgn4web code is copyright (C) 2009, 2012 Paolo Casaschi and licensed under the terms of the GNU General Public License version 2 as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.