The conditions you have to meet are specific to the color-coded spaces. For example, if it provides a single number, every side of a tile in that space must add up to the number provided. It is possible – and common – for only half a tile to be within a color-coded space.
If an area does not have any color coding, it means there are no conditions on the portions of dominoes within those spaces.
，更多细节参见新收录的资料
Continue reading...。新收录的资料对此有专业解读
if (frame.forestChild?.returnValue) {，更多细节参见新收录的资料