| 1 | Styles must be improved (full width for smartphones, selectable text for PGN...) |
| 2 | Tooltip text should fade (even when mouse stay on it, especially for small screens) |
| 3 | Checkered stage 2: switch button at reserve position. |
| 4 | If a played disconnect right after opponent sent a move, it might be never received: secure this |
| 5 | Think about non-conventional variants with 2 kings for example: undercheck highlight? |
| 6 | --> underCheck should return a vector in this case. Adapt. |
| 7 | --> incheck should be an array of squares, in general. Think AntiKing |