+my $num_rankings = scalar @$rankings;
+
+# Lock all rounds but the last (active?) one
+for my $r (0..$#rounds-1) {
+ $rounds[$r]->{'locked'} = 1;
+}
+
+# If there's only one group left and it's valid for closing, we can also finish
+# the entire tournament if we'd like
+if ($closing_valid && (scalar @rounds > 0 && scalar @{$rounds[$#rounds]->{'parallels'}}) == 1) {
+ $finishing_valid = 1;
+}
+
+# If there have been no rounds, check out the number of participants; if not, check the
+# number of qualified from the last round
+my $num_qualified;
+if ($num_rounds == 0) {
+ my $ref = $dbh->selectrow_hashref('SELECT COUNT(*) AS num_participants FROM tournamentparticipation WHERE tournament=?', undef, $id);
+ $num_qualified = $ref->{'num_participants'};
+} else {
+ my $ref = $dbh->selectrow_hashref('SELECT SUM(numqualifying) AS numqualifying FROM rounds NATURAL JOIN groups WHERE tournament=? AND round=?', undef, $id, $num_rounds);
+ $num_qualified = $ref->{'numqualifying'};
+}
+
+# And last: If there is a ranking list, the tournament is closed and we really can't
+# do anything more
+if ($num_rankings > 0) {
+ $closing_valid = 0;
+ $finishing_valid = 0;
+ $rounds[$#rounds]->{'locked'} = 1;
+}