Not the OP, but it’s partly a parity problem—if a marble starts in a position with (say) an even row # and odd column #, then no matter how it jumps, it will al

Not the OP, but it’s partly a parity problem—if a marble starts in a position with (say) an even row # and odd column #, then no matter how it jumps, it will always have an even row # and odd column #.