You mean "Everytime D captures a piece from B (let's say... a queen), C has the right to put that black queen into his board (and that put counted as a move)."
Did he not just exactly describe Bughouse? Or am i missing something. If i am not mistaken, search Bughouse chess on the internet.
OK, here's how it's going:
There're two chessboard, 4 players (2 team).
Each team has 1 white player and 1 black player. Let's say: Team 1 (A white, B black) and Team 2 (C black, D white). It's gonna be: A vs C and B vs D.
Everytime A captures a piece from B (let's say... a queen), C has the right to put that black queen into his board (and that put counted as a move).
If one game is ended (checkmated), then all the team wins.
No promotion is allowed. No put-in on the last row or in checking position.
PS: Any website-maker guru has the idea of making this kind of game available on the web?