--- a/yms/libotp.php	Mon Apr 11 11:23:30 2016 -0400
+++ b/yms/libotp.php	Wed Jan 11 13:02:34 2017 +0000
@@ -78,7 +78,5 @@
 
 function yms_within($test, $control, $fuzz)
 {
-  $min = $control - $fuzz;
-  $max = $control + $fuzz;
-  return $test > $min && $test < $max;
+  return abs($control - $test) <= $fuzz;
 }