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Rich Hutnik mentions zones to introduce pieces within 64 squares. One meaning of 'zones' would be like  F. V. Morley's or Sibahi's.  Morley's book 'My One Contribution to Chess' from 1940's adds two corridors 6 squares each along the sides, making 76 squares, but there are no pieces there in the array -- modest and undisruptive like elementary back-rank 'gating'. Now Abdul-Rahman Sibahi[unlike his 64-square Energizer] adds similar zones, only 4 squares each behind the initial set-up, making 72 squares, to accomodate RN, BN. Under 'Falcon Chess Variants Several' Preset at Game Courier is 'Falcon Chess with Chancellor & Cardinal'. So, before Seirawan Chess, and other than Betza's Tutti-Frutti and Karakus' Perfect, is attempt to put RN and BN on fewer than 80 squares, like that one approved for Sibahi. Actually there are RN & BN on < 64 squares as well, if we can recall some of them(Gilman may have done this, certainly some Gilman's have RN, BN at 64-79).  Another CV with ongoing drops is Altair. There Roberto Lavieri accepted my characterization of the vertical-translation capabability of about half Lavieri's piece-types as particularizing drops, since they go to any square of one other rank(3 away), regardless the piece's inherent movement; but they are already on board. Interesting game Altair. In a sense, it is held up as one of the all-time top 3 in mentioning Rococo, Centennial, and Altair together. Of course, a few years ago, we had Switching Chess in there, not so well liked anymore, partly because already invented, it turned out, excepting King switching. Really why would not Switching Chess solve all problems to do away with overuse of rote practice? It has 64 squares and would be easy even to switch one piece over to an adjacent occupied square, and instead an off-board piece onto that arrival square, with the piece thus substituted leaving the board to make room for the probably-new type(other than RNBQ) in regular move by such 'Off-Board Switching', according to availability.  As if combining Pocket Piece with Switching practice on same and sure 64 squares.