Landing pieces from empty board:
https://www.chessvariants.com/diffsetup.dir/unachess.html
-S-chess https://en.wikipedia.org/wiki/Seirawan_chess
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Generator variant, called "Matrix" ?
Peces on first rank never move but generate new pieces. Pawn don't generate.
A generator captured and replaced by a similar piece does not generate.
Synchrone Chess: allow to anticipate en-passant capture as well :)
Dynamo chess
+
+Omega chess (ask first)