+ JavaScript chessboard powered by <a href="http://chessboardjs.com/">chessboard.js</a>
+ and <a href="https://github.com/jhlywa/chess.js">chess.js</a>.
+ Ding sound by <a href="https://www.freesound.org/people/Aiwha/sounds/196106/">Aiwa</a> (CC-BY-3.0).
+ 7-man Lomonosov tablebase lookup by <a href="http://tb7.chessok.com/">ChessOK</a>.</p>