David Howe made a list of some features of a chess variant game. I am going to list a few more (but without assigning points to them):
12. Game does not involve physical dexterity, drinking, etc, so it could be put into a computer; but no computer is required to play game in general.
13. Real time taken does not affect the rules of the game (except the tournament rules, which might give you time limits, and stuff like that).
14. Board is finite and the geometry/topology of the board won't change during the game.
15. The game is played using standard chess pieces and chess board.
16. There is no decision other than the movement of the pieces.
17. Pieces moves like chess pieces can move.
18. You will normally have a choice of which piece to move and which way to move it (within the restrictions of the rules).
19. Game has well-defined ending condition.
20. You win, or lose, or draw; it is not ambiguous and you do not win by a number of points which can vary.
21. The different function of different pieces is mostly only their difference of movement.
22. Pieces belong to a player.
Some games might partially or almost have a property listed but not entirely, or have slight variations on the properties listed (for example, more than one royal piece, or some pieces captures by displacement and others don't, or special circumstances in which you can move more than one piece, etc).
I think Nemoroth is a chess variant: Humans is like the pawns (weakly, more of them at the start, cannot retreat, and promotes); uses equal sides; different pieces of different function; etc. But in chess the pieces just move differently while in Nemoroth their other functions also vary a lot. There are many other differences too rather than make them like other chess variant games.
P.S.: You still did not fix the bold footer (there is an extra B tag which should be removed)