diff --git a/src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/data/CompetitionGroup.java b/src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/data/CompetitionGroup.java
index 9cc8b16..6fc6ab4 100644
--- a/src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/data/CompetitionGroup.java
+++ b/src/main/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/data/CompetitionGroup.java
@@ -23,6 +23,14 @@ public class CompetitionGroup implements Serializable {
 	private int minBirthYear;
 	private int maxBirthYear = OPEN_END_MAX_YEAR;
 	
+	private CompetitionGroup() {
+	}
+	
+	CompetitionGroup(int oldest, int youngest) {
+		this.maxBirthYear = youngest;
+		this.minBirthYear = oldest;
+	}
+	
 	public int getOldestBirthYear() {
 		return minBirthYear;
 	}
@@ -46,7 +54,12 @@ public class CompetitionGroup implements Serializable {
 				competitionGroup.minBirthYear = OPEN_END_MIN_YEAR;
 			}
 		}
-		
+
+		if (competitionGroup.maxBirthYear < competitionGroup.minBirthYear) {
+			int tmp = competitionGroup.maxBirthYear;
+			competitionGroup.maxBirthYear = competitionGroup.minBirthYear;
+			competitionGroup.minBirthYear = tmp;
+		}
 		return competitionGroup;
 	}
 
@@ -67,4 +80,8 @@ public class CompetitionGroup implements Serializable {
 			return line.toLowerCase().contains(youngest);
 		}
 	}
+
+	public boolean isBirthyearInGroup(int birthYear) {
+		return maxBirthYear >= birthYear && minBirthYear <= birthYear;
+	}
 }
diff --git a/src/test/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/data/CompetitionGroupLineParseTest.java b/src/test/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/data/CompetitionGroupTest.java
similarity index 62%
rename from src/test/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/data/CompetitionGroupLineParseTest.java
rename to src/test/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/data/CompetitionGroupTest.java
index 5522c1d..c3e8a99 100644
--- a/src/test/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/data/CompetitionGroupLineParseTest.java
+++ b/src/test/java/de/kreth/vaadin/clubhelper/vaadinclubhelper/data/CompetitionGroupTest.java
@@ -7,31 +7,34 @@ import java.util.regex.Pattern;
 
 import org.junit.Test;
 
-public class CompetitionGroupLineParseTest {
+public class CompetitionGroupTest {
 
 	@Test
 	public void testTwo4DigitYears() {
 		
 		CompetitionGroup group = CompetitionGroup.parseLine("Schüler – innen E 2008 -2009 P4");
 		assertEquals(2009, group.getYoungestBirthYear());
+		assertValuesOrder(group);
 		
 		group = CompetitionGroup.parseLine("Heranwachsende 2001-1995 P8");
-		assertEquals(1995, group.getYoungestBirthYear());
+		assertEquals(1995, group.getOldestBirthYear());
+		assertValuesOrder(group);
 		
 		group = CompetitionGroup.parseLine("Jugend C: Jg. 2004/2005 W11 - W13");
 		assertEquals(2005, group.getYoungestBirthYear());
+		assertValuesOrder(group);
 
 		group = CompetitionGroup.parseLine("Schüler – innen E 2008 -2009 P4");
 		assertEquals(2008, group.getOldestBirthYear());
-		
-		group = CompetitionGroup.parseLine("Jugend E: 2008 und jünger P8 - W11");
-		assertEquals(2008, group.getOldestBirthYear());
+		assertValuesOrder(group);
 		
 		group = CompetitionGroup.parseLine("Heranwachsende 2001-1995 P8");
-		assertEquals(2001, group.getOldestBirthYear());
+		assertEquals(2001, group.getYoungestBirthYear());
+		assertValuesOrder(group);
 		
 		group = CompetitionGroup.parseLine("Jugend C: Jg. 2004/2005 W11 - W13");
 		assertEquals(2004, group.getOldestBirthYear());
+		assertValuesOrder(group);
 
 	}
 
@@ -40,18 +43,44 @@ public class CompetitionGroupLineParseTest {
 
 		CompetitionGroup group = CompetitionGroup.parseLine("Erwachsene: Jg. 1996 und älter W15 - FIG A");
 		assertEquals(1996, group.getYoungestBirthYear());
+		assertValuesOrder(group);
 	}
 	
 	@Test
 	public void testOneYearIsOldest() {
 		CompetitionGroup group = CompetitionGroup.parseLine("Schüler – innen F 2010 und jünger P3");
 		assertEquals(2010, group.getOldestBirthYear());
+		assertValuesOrder(group);
 
 		group = CompetitionGroup.parseLine("Jugend E: 2008 und jünger P8 - W11");
 		assertEquals(2008, group.getOldestBirthYear());
+		assertValuesOrder(group);
 		
 	}
 	
+	@Test
+	public void testTestConstructor() {
+		CompetitionGroup g = new CompetitionGroup(2008, 2009);
+		assertValuesOrder(g);
+	}
+	
+	@Test
+	public void testBirthYearTest() {
+		CompetitionGroup g = new CompetitionGroup(2000, 2009);
+		for (int i = 2000; i<=2009; i++) {
+			assertTrue(g.isBirthyearInGroup(i));
+		}
+		assertFalse(g.isBirthyearInGroup(0));
+		assertFalse(g.isBirthyearInGroup(1999));
+		assertFalse(g.isBirthyearInGroup(2010));
+		assertFalse(g.isBirthyearInGroup(9999));
+	}
+	
+	CompetitionGroup assertValuesOrder(CompetitionGroup g) {
+		assertTrue(g.getOldestBirthYear() <= g.getYoungestBirthYear());
+		return g;
+	}
+	
 	@Test
 	public void testRegexPattern() {
 		Pattern pattern = Pattern.compile("\\d{2,4}");