61

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The 61 1st-move pairs in chess yielding the minimum 19 2nd-move options for White are the symmetrical double advances of King-Bishop Pawns and all 20 responses with either that pawn's or either Rook Pawn's single advance. [Merickel]

Submitted: 2016-08-14 22:36:44;   Last Modified: 2016-08-15 06:33:05.
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