tournament_contest_turn_winner_effect

tournament_contest_turn_winner_effect = {
	# Achievement.
	little_william_marshal_achievement_contest_end_effect = yes
	scope:activity = {
		every_guest_subset = {
			name = qualified
			set_variable = {
				name = progress_to_victory
				value = progress_to_victory_active_contestant_value
			}
		}
		save_scope_value_as = { name = contest_complete value = flag:$CONTEST$ }
		# Set winner if player
		if = {
			limit = {
				any_guest_subset = {
					name = qualified
					phase = tournament_phase_$CONTEST$
					is_alive = yes
					exists = var:contest_aptitude
					exists = var:progress_to_victory
					is_ai = no
					save_temporary_scope_as = winner_temp
				}
				NOT = {
					any_guest_subset = {
						name = qualified
						phase = tournament_phase_$CONTEST$
						is_alive = yes
						exists = var:contest_aptitude
						exists = var:progress_to_victory
						var:progress_to_victory > scope:winner_temp.var:progress_to_victory
					}
				}
			}
			random_guest_subset = {
				name = qualified
				phase = tournament_phase_$CONTEST$
				limit = {
					is_alive = yes
					exists = var:contest_aptitude
					exists = var:progress_to_victory
					is_ai = no
					save_temporary_scope_as = winner_temp
					scope:activity  = {
						NOT = {
							any_guest_subset = {
								name = qualified
								phase = tournament_phase_$CONTEST$
								is_alive = yes
								exists = var:contest_aptitude
								exists = var:progress_to_victory
								var:progress_to_victory > scope:winner_temp.var:progress_to_victory
							}
						}
					}
				}
				save_scope_as = contest_winner
			}
		}
		# Determine winner
		else = {
			random_guest_subset = {
				name = qualified
				phase = tournament_phase_$CONTEST$
				limit = {
					is_alive = yes
					exists = var:contest_aptitude
					exists = var:progress_to_victory
					save_temporary_scope_as = winner_temp
				}
				weight = {
					base = 1
					# Weights heavily on PtV, and major differences in score
					tournament_contest_winner_determiner_modifier = { CHAR = scope:winner_temp CONTEST = $CONTEST$ }
				}
				save_scope_as = contest_winner
			}
		}
		scope:contest_winner = {
			tournament_complete_win_contest_intent_effect = yes
			# Achievement.
			little_william_marshal_achievement_contest_end_winner_effect = yes
		}
		# Determine second place
		random_guest_subset = {
			name = qualified
			phase = tournament_phase_$CONTEST$
			limit = {
				is_alive = yes
				exists = var:contest_aptitude
				exists = var:progress_to_victory
				this != scope:contest_winner
				save_temporary_scope_as = second_temp
			}
			weight = {
				base = 1
				# Weights heavily on PtV, and major differences in score
				tournament_contest_winner_determiner_modifier = { CHAR = scope:second_temp CONTEST = $CONTEST$  }
			}
			save_scope_as = second_place
		}
		# Determine third place
		random_guest_subset = {
			name = qualified
			phase = tournament_phase_$CONTEST$
			limit = {
				is_alive = yes
				exists = var:contest_aptitude
				exists = var:progress_to_victory
				NOR = {
					this = scope:contest_winner
					this = scope:second_place
				}
				save_temporary_scope_as = third_temp
			}
			weight = {
				base = 1
				# Weights heavily on PtV, and major differences in score
				tournament_contest_winner_determiner_modifier = { CHAR = scope:third_temp CONTEST = $CONTEST$  }

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