Nielsen's remarkable efficiency of 33 goals in 46 matches was driven by a combination of elite spatial awareness and clinical finishing. Tactically, he demonstrated an exceptional ability to read the game, allowing him to find pockets of space within the opposition defensive lines. This positioning allowed him to arrive at the exact moment required to convert crosses or loose balls in the penalty area.
Technically, his proficiency in various finishing scenarios was a key factor. He possessed the composure to make accurate decisions in high-pressure situations, whether through precise first-time strikes or controlled movements under pressure. His ability to manipulate the ball in tight spaces meant he could create shooting opportunities even when heavily marked by defenders.
Furthermore, his physical conditioning and explosive movement helped him outpace opponents in transition phases. By combining these technical skills with a high footballing intelligence, he consistently maximized his goal-scoring opportunities throughout his youth international career. This blend of instinct and technique made him a constant threat in the final third of the pitch.