Obligatory link: https://www.chess.com/forum/view/general/rpg-chess
Level Up Chess

Changes:
Tier list will be replaced by job path instead. You can only level up a piece by one rank higher on each chosen path. These path in order from lowest rank to highest are:
Pawn to Knight, Bishop, or Rook
Knight to Archbishop or Chancellor
Bishop to Archbishop or Queen
Rook to Chancellor or Queen
The rules are the same except for these changes. All pieces except kings can be promoted to any pieces by spending exp. points. White starts with 4 exp. while Black start with 5 exp. Every time you captured enemy pieces, you gain exp. points. If you capture the following you will gain the following exp. points.
Captured Pawn gives 1 exp. points.
Captured Knight or Bishop gives 3 exp. points
Captured Rook gives 5 exp. points
Captured Archbishop gives 7 exp. points
Captured Chancellor or Queen gives 9 exp. points
Leveling up a piece is considered a move. You can only level up a piece by one tier above a piece. These are the tier of the pieces.
Pawn is Tier 0
Knight and Bishop are Tier 1
Rook and Archbishop are Tier 2
Chancellor and Queen are Tier 3
In order to level up a piece. You need to spend exp. points by the equation below.
En = (Ph - P) x 2
En = Exp. Needed
Ph = Promoted piece value
P = Piece Value
For example, you want to promote Knight to Archbishop
En = (7 - 3) x 2
En = 8 exp. points.