A A B C D E F G H B A B C D E F G H
8 r . b . . . . r 8 8 . . . k . . . . 8
7 p . . p . p p p 7 7 . . . . . . . . 7
6 . q . . . . . . 6 6 n p p . . n . B 6
5 . . . . . . . . 5 5 . . . . . . . . 5
4 . . . . . . . . 4 4 . . . P P . . . 4
3 Q . . . . . . . 3 3 . . N B . . . . 3
2 P P P . . P P P 2 2 . . . . . . . . 2
1 . K . . R . N R 1 1 . . . . . . . . 1
A B C D E F G H A B C D E F G H
1. e4/A e5/A
2. Qh5/A Be7/A
3. Nc3/A Qf6/A
4. Qxe5/B+ Kf8/A
5. d4/A Bd6/B
6. Qg3/A Qe6/B+
7. Ne2/B c6/A
8. Bh6/A+ Ke7/B
9. O-O-O/A Qc4/A+
10.Nc3/A Ba3/A+
11.Kb1/B Na6/A
12.Qe5/B+ Kd8/A
13.Qa5/A+ b6/A
14.Qxa3/B Nf6/A
15.Bd3/A Qb5/B
16.Re1/B
I missed something in my rule update. XD The position must be valid both before and after teleportation; otherwise, checkmate will be exceedingly difficult because the king can move into check and then teleport to the other board.