61

This number is a prime.

Just showing those entries submitted by 'Merickel': (Click here to show all)

+ 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]

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