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9 innings on 90 x 90 ''feet'' bases, squares all around. 9-Player-pieces, 9 nonants  of 9 squares each, 9x9 Baseball Chess RNBKQCBNR, same as LF-3B-SS-C-P-CF-2B-1B-RF.  One nonent is inactive, the Catcher-King's. Teams may decide whether Bishop-adjustment [conversion] rule applies or not,  and what form of castling.        
                                                        LF__CF__RF
         The Cardinal(BN)-Centerfielder's               SS__PI__2B
nonant encompasses the other player's King              3B__CA__1B
in the beginning; and these particular nonants are called Home Plate.
White's is d7, d8, d9, e7, e8, e9, f7, f8, f9. Black Cardinal's Home
Plate is nonant(d1, d2, d3, e1, e2, e3, f1, f2, f3). Baseball Variation
(n) When Cardinal-CenterFielder reaches Home Plate, that team wins,
regardless whereabouts of King, or escape route. (o) Cardinal in Home
Plate checking also immobilizes, ergo checkmate.  (p) Cardinal(BN) to a
Home Plate square (any of the 9) promotes to Amazon (RBN).  (q) Cardinal
to Home Plate removes, unless itself immediately captured, the other
Cardinal anywhere on board. (r) Carrera-Capablanca Cardinal to Home Plate moves again.  (s) Arrival at her nonant, Home Plate, is Foul Ball, displacing Cardinal at once to any vacant square on the board by choice; a Foul Ball may be deliberately advantageous of course. Baseball Chess 'm-sub ii' and 's' would be good combination of Mutators, conjoining Spitballs by the Queen on the Mound and Foulballs by the Cardinal at Home Plate. (These rules-choices are ''mutators'' requiring selective prior agreement of opposing teams.)