У вашего броузера проблема в совместимости с HTML5
Chess.com bot that plays as any UCI engine.
Komodo9 was running with a single thread and looking at depth 15.
It works by taking screenshots of the window and crops the board out. Then the board is split into 8x8 squares, check each square's corner pixel and middle pixel for specific colors to get last move, sends it to the engine. The engine does his black magic and sends back the best move. all deh progremz haz to do now iz to klick on deh crrect squres
The main issue with this method is that if 3 squares are selected then the getlastmove stuffz fails :{ and timing also causes it to fail but rarely.