Change the directory of pgn4web from '_assets' to static 'assets'.

assets/vendor/pgn4web/libs/garbochess/LICENSE.txt

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+Copyright (c) 2011 Gary Linscott
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+3. The name of the author may not be used to endorse or promote products
+   derived from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

assets/vendor/pgn4web/libs/garbochess/README.txt

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+THE GARBOCHESS CHESS ENGINE
+
+GarboChess is a javascript chess engine licensed by Gary Linscott under BSD
+license, see LICENSE file.
+
+Homepage: http://forwardcoding.com/projects/ajaxchess/chess.html
+Repository: https://github.com/glinscott/Garbochess-JS/
+
+
+IMPLEMENTATION NOTES
+
+Please note that GarboChess is processor intensive; in order to optimize
+computing resources, the analysis of each board is limited to a short time.

assets/vendor/pgn4web/libs/garbochess/index.html

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+