FAIR CHESS

First player has one move, after which players may play either one or two moves per turn, at their choice.

Both moves of the two must separately be legal FIDE moves for the position faced; there is no enpassant but all other FIDE rules apply.

1       c4         c5  Nf6  
2  b4   Nf3       c:b4 Nc6  
3  a4   g3         a5   e5  
4  N:e5 d4        N:e5  d6  
5  Bg5  d:e5      Qc7  Ne4  
6  Bg2  e:d6      N:d6 Bd7  
7  O-O  Qd4       f6   Be7
8  Bf4  Qd5       Q:c4 Rc8
9  Q:b7 B:d6      B:d6 Qc7
10 Rc1  Qe4+      Kd8  Be5
11 R:c7 Nd2       R:c7 B:a1
12 Nb3  Qa8+      Bc8  Ke7
13 N:a1 Qe4+      Be6  ---
14 Nb3  Bh3 ?     f5   Rc3+ !
15 N:c1 Bf1       f:e4 Rd8
16 resign

. . . r . . . . 8
. . . . k . p p 7
. . . . b . . . 6
p . . . . . . . 5
O p . . p . . . 4
. . . . . . O . 3
. . . . O O . O 2
. . N . . B K . 1
a b c d e f g h

After move 14, White loses the queen and is unable to recover the R vs N advantage.

This chess variant, with a pace equal to Marseillais Chess is indeed quite different. Pieces that are moved inside the same turn do not give extra liberties to each other (each move must be legal according to the initial position at the start of the turn).