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<p>The <code>Board.board[pos]</code> value is the index of the piece you will find in <code>Board.pieces</code>. For instance, if there is a piece at position <code>pos</code> (<code>board.board[pos] >= 0</code>), then <code>board.pieces[board.board[pos]].p</code> is always equal to <code>pos</code>.</p> <p>Regarding the promotion in Grand Chess, we indeed just verify there is a piece of the type that has been captured at some point. Whether we had promotions to that type is not considered. We should instead count the number of pieces in play for each type, and offer promotion to that type if this is not already the maximum. That should be easy to fix. Good catch !</p> <p>About <code>debugger;</code>, make sure the developer tools are open otherwise the instruction does not do anything.</p> <p>I'm afraid i cannot tell much about the three.js 3D generation, that was Jerome's area and he is currently busy with other stuff. I'll see with him if he can give some explanations.</p>