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700-year-old hook-moving Gryphon protects Bison Pawns a and j in
Bn-G-Bp-N-Amazon-K-N-Bp-G-Bn. All other pawns are twice array-protected and thrice by the King. So required ''piece-developed-first'' does not play havoc with early pawn attacks. They just are no more feasible than usual. If 1 Bison a1-b4, 1 ...N-c6 quickly doubly protects Black Pawn-a7; and so on.  In Contingency Pawn CVs, pieces must draw out the Pawns, preceding them.  No 'e2-e4' until Amazon behind has moved away!  Central King Pawn-f2 is array-stuck until King himself castles or is forced from his beginning f1. Recognizable mid-games are nil, because here pieces fronting the Pawns tend to form outer shield, an advance perimetre, for the Pawns within. Mid-games involve some back-protecting of forward pieces who will want to return behind relative safety of Pawn phalanxes. Contingency Pawn games may benefit from other optional contingency.  One, sides may agree in advance a subvariant each Pawn has additional non-capturing forward-advance option
according to number of her present rank position.  It perfectly fits the
initial-array rank-two optional two-step: 2 and 2.  Then rank three a
three-step (3 and 3) to rank 6, and rank four to eight (4 and 4) and
instant promotion.  Reverses for Black.  Usually those three-steppings and
four-steppings with the board but eight-deep are solidly blocked.  Since
the year 1500, Pawn initial two-step has always had this IMPLICIT rare
three-step and four-step from ranks 3 and 4 respectively by plain sheer
logic, insofar as the pro-active ability hinges on her rank. You just do not see it a lot. In future,
when sitting for Chess, ''do you play two-step?'' means also
three/rank-3 and four/rank-4 as inclusive package-mutator for variegated
Cont. Pawns. The spice of life.