«فَإِنَّهَا عُضْلَةُ الْعَقْدِ»
For it is the stubborn knot of the problem.
ʿUḍlah suggests obstruction or a difficulty that resists solution, while ʿaqd literally means a knot. The image describes an intricate literary task, not a rope that must be untied.
The participant prides himself on devising a challenge demanding exceptional control over written Arabic. That distinction matters: the exercise tests more than knowledge of ordinary vocabulary or prose style.
«وَمَحَكُّ الْمُنْتَقِدِ»
And the critic’s touchstone.
The image of testing metal on a touchstone becomes a metaphor for evaluating literary skill.