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Baseball Chess 9x9, Strikes & Balls.  RNBKQCBNR = 
LF-SS-1B-CA-PI-CF-3B-2B-RF.    They are determined by each teams' Pawns. 
Any diagonal containing three(3) Pawns is Strike Out for the duration
holding.  The Pawns do not have to be adjacent.            LF__CF__RF
Any horizontal row (other than array rank) with            SS__PI__2B
four Pawns, however spaced, is a Walk.  What               3B__CA__1B
does a Strike Out impose, or benefit accrue for four balls and Walking?  All the following (x) through (ff) are prior and in addition to normal move.  (x) A Strikeout requires moving one piece back one square straight or diagonal. (y) A Walk advances any piece to any square one rank forward.  (z) A Strikeout or Walk, either or both, change
the side's Pawn-type to Berolina.  (aa) A strikeout requires one Pawn to
return to Rank one, actually behind Pawn-array rank two.  (bb) Strikeout
requires any one piece within its nonant to move out of it immediately to
closest empty square, ties at choice.  (cc) Strikeout inactivates the
Queen's nonant, the Mound, and inactivates the Cardinal's nonant, Home
Plate, so long as the Strikeout is holding.  (dd) Walk requires teleporting one piece to any of its vacant nonant squares. (ee) Walk advances any piece of choice to the Mound any vacancy.  (ff) Three strikeouts on 3 different diagonals loses, and two walks on two different ranks wins. 
(These 'x' to 'ff', opposing teams would tend to agree on two or three to operate
per game.)