Claude Chaunier and I tried to play a kind of metagame: "Say a word and let´s make a game!" Well, I said inertia...

1. The FIDE rules apply, except in the following, with the spirit that the last pieces moved continue to move the same way in the next turns.
2. There is no notion of check, checkmate or stalemate. The winner is the player who captures the opponent's king.
3. If you moved a piece without making a capture in your last move, you are forced to play the same piece in the same direction without making a capture. If you can't, you are free to play whatever you want following Rules 1-2.
4. If you made a capture in your last move, you are forced to play the same piece in the same direction and make another capture with it. If you can't, you're free to play whatever you want following rules 1-2.
5. Checking or mating the opponent according to the FIDE rules in the middle of the moves are not valid reasons to stop moving/taking.
6. 'Direction' is meant in the oriented sense, so that there are 16 different directions possible in all, including the knight moves.
7. A king is not allowed to castle if he escapes an immediate capture or if the intermediate square he would cross is under immediate attack - like in FIDE rules but with Inertia rules of moves.
8. After castling, player's next move is free: the castling king and rook stay on their new position without having to continue their course.

Sample Games

   Inertia 1: Joao - Claude

    1. Nf3 a5 2. Ne5 a4 3. Nxf7 a3 4. Nxd8 h5 5. b4 h4 6. b5 h3  7. b6 cxb6
    8. gxh3 Ra4 9. Nc3 d6 10. Nd5 Bxh3 11. Nxb7 Rh4 12. Nc7+ Kf7 13. Rg1 Kg6
   14. Rxg6++ 1-0

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

   Inertia 2: Claude - Joao

    1. c4  Nf6 2. c5  Ne4  3. c6  e5 4. Qa4 Qh4 (* 4. cxd7 Bxd7? 5. h3 Bxh3
    6. gxh3 *) 5. Nf3 Qxf2 6. Kd1 Qb6  7. cxd7 Nxd7 (* 7... Bxd7 h3 Bxh3
       Qxe8++ *) 8. Qxe4 Qa5  9. a4  Kd8 10. Ng5 Nb6 (* 10... h5 Nh7 h4 Nxf8
       h3 Nxd7 *) 11. Na3 Qd5 12. Nc4 a5 13. Qh4 c5 14. Ra3 Kc7 15. e4  Qd8
   16. Qf4 Bd6 (* exf4 g3 fxg3 Ne6 gxh2 Nxc7++ *) 17. Nxd6 Kxd6 18. Nxf7 Kc6
   19. Nxe5! Qd3 (* 19... Kc7 Nc4 Kc6 Nxa5 1-0 *) 20. Nxd3 Nc4 21. Nb4 1-0
       (* 21... axb4 Rc3 bxc3 Qh6 cxd2 Qxc6++ *)

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

   Inertia 3: Joao - Claude

    1. e4  e5 2. Nf3 Nf6 3. Ng5 g6 4. g4  Qe7 5. Nc3?! Qe6 6. Nd5 Qxg4
    7. Ne7 Qxg5 8. Nxc8 Na6 9. Bxa6 bxa6 10. Nxa7 Ng4 (* 10... Rxa7 11. Rf1 *)
   11. Qf3 Rxa7 12. Qh3 Qf5 13. f4  exf4 14. Rf1 Ne3 15. Qf3 Qf6 (* 15. Qxe3
       fxe3 Rxf5 exd2 Rxf7 dxc1=Q+ Rxf8+ Qxf1++ *) 16. Rf2 Ba3
   17. dxe3?? Qc3+   18. exf4 Qxe1++ 0-1

    . . . . k . . r
    r . p p . p . p
    p . . . . . p .
    . . . . . . . .
    . . . . O O . .
    b . . . . Q . .
    O O O . . R . O
    R . B . q . . .
 
   Inertia 4: Claude - Joao

    1. e4 Nf6  2. e5 Ne4  3. e6 dxe6  4. Nh3 e5  5. Na3 Nxd2
    6. Qh5 Bxh3  7. gxh3  e6  8. Nb5 Na6 (* Black threatens Nb4 Nxc2+ 0-1 *)
    9. Bxd2  h6 10. Bxh6  gxh6 11. Bc4 Nb4 12. Bb3 Rg1 13. Ba4 Nxc2+ (* Nc6
       14. Rd1 forces Black's Q to be exchanged with R *) 14. Bxc2 Bg7
   15. Rd1 Bf6 16. Rxd8+ Rxd8 17. Bh7 Rh8 18. Rxh6  Ke7 19. Qc1 Bh4
   20. Bb1 Rh5 21. Qxc7+ Kg8 22. b4  Be7 23. Nxa7  Ke8 24. Qxb7  Bf8
   25. Qb5+  Ke7 26. Nc6+  e4! 26. Ne5 e3 27. Ng4 e2 28. Qxe2  Rh4
   29. Qf3 Ke8 30. Qf6 Bxb4+ 31. a3  Bxa3 32. Qxh4  1-0
 
   . . . r k . . .
   . . . . . p . .
   . . . . p . . .
   . . . . . . . .
   . . . . . . N Q
   b . . . . . . O
   . . . . . O . O
   . B . . K . . R
 
   Inertia 5: Joao - Claude
 
     1. d4 e5  2. d5 e4  3. d6 e3  4. Nh3 Qh4 (* 4. dxc7 Qh4  cxb8=Q Qxf2++
        4. Nh3 cxd6  Qd5 *)  5. Qd5 Nh6  6. Nc3 Ng4  7. Qf3 exg2+ 8. Nxg2 cxd6
     9. Nb5 Na6 10. b4 g5 11. Rb1 h5 12. Rb3 Kd8  13. Re3 Be7  14. Bd2 Bf6
    15. Bc3 b6  16. Nc7 b5  17. Nxa8 Bb7  18. Qxb7 Nxf2  (* 18... Qxf2+ Kd2
        Qxe3+ Nb6! Qxb6 *) 19. Kd2 Bd4?  (* 19. Qxa6?? Nd3+  Kd2 Bxd3+ 0-1 *)
    20. Ba1! Bb2 (* 20... Bc3+?? Rd8+ Bb2 1-0 *)  21. Qxa6 Qc4  22. Qxa7 Qxc2+
    23. Ke1  Nd3+  24. exd3 Ba3 (* 24. Rxd3 Ba3 Rxa3 Qc1 0-1  24... Qb1+ Ke2
        Qc2+ d4! 1-0 *) 25. Qb8+ Qc8 26. Qxc8+ Kxc8 27. Bxh8 Kb8 28. Ke2 Bxb4
    29. h4  gxh4 30. Rh3 resign 1-0
 
     N k . . . . . B
     . . . p . p . .
     . . . p . . . .
     . p . . . . . p
     . b . . . . . p
     . . . O R . . R
     O . . . K . O .
     . . . . . B . .
 
   Inertia 6 : Claude - Joao
 
    1. Nh3  Na6  2. Na3  Nh6  3. Nb5  Ng4  4. b4   g5  5. Rb1  Bh6
    6. Rb3  0-0  7. Ra3  b6  8. Nc3  b5  9. Ne4  Rb8 10. e2   Nxf2
   11. Nxf2 Rb6 12. Bb2  Bb7 13. Qa1  Rg6 14. Nd3  Bg7 15. Ne5  Bxe4??
   16. Bc4  Bxg2 17. Bxf7+ Bxh1 18. Bxg8  1-0
 
    . . . q . r B .
    p . p p p . b p
    n . . . . . r .
    . p . . N . p .
    . O . . . . . .
    R . . . O . . .
    O B O O . . . O
    Q . . . K . . b

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