olymmath

BALTIC-WAY 2017 Problem 6

    Fifteen stones are placed on a 4×44 \times 4 board, one in each cell, the remaining cell being empty. Whenever two stones are on neighbouring cells (having a common side), one may jump over the other to the opposite neighbouring cell, provided this cell is empty. The stone jumped over is removed from the board.

    For which initial positions of the empty cell is it possible to end up with exactly one stone on the board?

    Dataset text NuminaMath olympiads. Quoted with source.

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