tournament_contest_versus_winner_effect

tournament_contest_versus_winner_effect = {
	# Achievement.
	little_william_marshal_achievement_contest_end_effect = yes
	scope:activity = {
		save_scope_value_as = { name = contest_complete value = flag:$CONTEST$ }
		# Save winner and add to overall winner tracker
		random_guest_subset = {
			name = winner
			phase = tournament_phase_$CONTEST$
			save_scope_as = contest_winner
			tournament_complete_win_contest_intent_effect = yes
			# Achievement.
			little_william_marshal_achievement_contest_end_winner_effect = yes
		}
		# Save other finalist as second place
		random_guest_subset = {
			name = second_place
			phase = tournament_phase_$CONTEST$
			save_scope_as = second_place
		}
		if = {
			limit = {
				NOT = { exists = scope:second_place }
			}
			scope:contest_winner.var:next_versus_match ?= { save_scope_as = second_place }
		}
		# Save all non-winner entrants so we can easily check if someone lost
		every_guest_subset = {
			name = qualified
			phase = tournament_phase_$CONTEST$
			limit = {
				NOT = { scope:contest_winner ?= this }
			}
			add_to_list = contest_losers
		}
		# Rewards
		tournament_contest_rewards_effect = { CONTEST = $CONTEST$ }
		# Fire host's prize award event
		activity_host = { trigger_event = contest_events.0805 }
		# Clear redundant variables
		remove_variable = contest_versus_progress
		every_attending_character = { tournament_clear_contest_variables_effect = yes }
	}
}

As written in game/common/scripted_effects/04_dlc_ep2_tournament_effects.txt.