diff --git a/admin/tours_sa.php b/admin/tours_sa.php
index 901df9a..1470f0a 100644
--- a/admin/tours_sa.php
+++ b/admin/tours_sa.php
@@ -70,13 +70,26 @@ set_percent(0);
 		+5 - Noone from the same school
 		If ranked (rank=1,2,3,4,...):
 		+(rank*rank*5 - 5) = +0, +15, +40, +75
-		If not ranked:
+		If not ranked and max choices specified
 		+(max_choices*max_choices*5) (always greater than ranked)
+		else max choices not specified 
+		+((max_choices-1)*(max_choices-1)*5)
 	- Foreach tour
 		+100 for each student above the capacity
 		+200 for each student below 1/4 the capacity,but
 			zero if the tour is empty
+
+Notes:
+	- If a student doesn't fill in all their choices, we don't want to give
+	  them an unfair scheduling advantage.  They'll significantly increase
+	  the cost if they don't get their chosen tour, whereas someone who
+	  specifies all the choices will gradually increase the cost.  So, we
+	  want to make it "more ok" for the annealer to place someone who
+	  hasn't ranked their max number of tours in any tour, and make it
+	  "less ok" for someone who has specified all the rankings to be placed
+	  anywhere. 
 */
+
 function tour_cost_function($annealer, $bucket_id, $ids)
 {
 	global $config;
@@ -118,8 +131,14 @@ function tour_cost_function($annealer, $bucket_id, $ids)
 			if($rank_tid != $tid) continue;
 			$rank_cost = ($rank * $rank * 5) - 5;
 		}
+
 		if($rank_cost == -1) {
-			$rank_cost = $config['tours_choices_max'] * $config['tours_choices_max'] * 5;
+			/* Coulnd't find tour id in the student ranks*/
+			if(count($s['rank']) < $config['tours_choices_max']) {
+				$rank_cost = ($config['tours_choices_max']-1) * ($config['tours_choices_max']-1) * 5;
+			} else {
+				$rank_cost = $config['tours_choices_max'] * $config['tours_choices_max'] * 5;
+			}
 		}
 		$cost += $rank_cost;