send_poem_legacy_duel_effect

send_poem_legacy_duel_effect = {
	duel = {
		skill = diplomacy
		target = $POV_TARGET$
		# Scope:actor's words find their mark.
		50 = {
			compare_modifier = {
				value = scope:duel_value
				multiplier = -3.5
				min = -49
				max = 49
			}
			desc = send_poem_interaction.success
			# Sort notifications & output.
			send_poem_legacy_duel_victory_notification_effect = yes
		}
		# Scope:recipient is able to publicly ridicule the poem.
		50 = {
			compare_modifier = {
				value = scope:duel_value
				multiplier = 3.5
				min = -49
				max = 49
			}
			desc = send_poem_interaction.failure
			# Sort notifications & output.
			send_poem_legacy_duel_defeat_notification_effect = yes
		}
	}
}

As written in game/common/scripted_effects/00_poetry_effects.txt.