Good Work, sir! You were just demoted!

This game accomplishes, imho, a difficult task: create a potential good chess variant using just a very simple idea.

Promotions & Demotions

1. The FIDE rules apply except in the following:
2. The system of Promotions/Demotions respects the following ordering: P<N=B<R<Q.
3. On odd turns, the moved (non king) piece is promoted. Queens cannot be promoted, so they cannot move on odd turns. This rule does not apply to typical FIDE promotions..
4. On even turns, the moved (non king) piece is demoted. Pawns cannot be demoted, so they cannot move on even turns. A Bishop or Knight cannot move (and then demote to a Pawn) to the last rank.
5. There is no en-passant.
6. Castling affects the Rook.
7. A stalemated player looses the game.

Sample game

1. c4=B    c6=B
2. Qb3=R   Qa5=R
3. f3=B    e6=B
4. B:e6=P  B:f3=P
5. e:f7=B  f:g2=B 

There is no check, since the bishop cannot move to the last rank on odd moves.

6. B:g2=P+ K:f7
7. Nf3=R+  Nf6=R
8. Rc3=B 

r n b . . b . r
p p . p . k p p
. . . . . r . .
r . . . . . . . 
. . . . . . . .
. . B . . R . .
O O . O O . O O
R N B . K . . R

8...        R:f3=N+
9. g:f3=B   a6=N
10. B:a4=P  Kg8
11. b3=B    d5=N
12. Bf:d5=P Nb4=P
13. Rf1=Q   Nc6=R
14. N:a3=P  R:c1=B
15. R:c1=Q  Bg4=R

r . . . . b k r
. p . . . . p p
. . . . . . . .
O . . O . . . .
. p . . . . r .
O B . . . . . .
O . . O O . . O
. . Q . K Q . .

16. Qc7=R  Rh4=B+
17. Kd1    b5=N
18. Rf7=B+ K:f7
19. d6=N+  Ke7
20. Nb7=P  R:a5=B
21. h3=B   Bd8=R
22. Qf7=R+ Ke8
23. Kc2    Bc5=R+
24. Kb2    0-1

Final Position 
===============
. . . r k . . r
. O . . . R p p
. . . . . . . .
. n r . . . . .
. p . . . . . b
O B . . . . . B
O K . O O . . .
. . . . . . . .
[mate in three]

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