diff --git a/admin/api/stats.go b/admin/api/stats.go
index 85a4b5b6..36addb45 100644
--- a/admin/api/stats.go
+++ b/admin/api/stats.go
@@ -30,6 +30,7 @@ func genStats() (interface{}, error) {
 					exos[fmt.Sprintf("%d", exercice.Id)] = fic.ExportedExercice{
 						exercice.Title,
 						exercice.Gain,
+						exercice.Coefficient,
 						exercice.SolvedCount(),
 						exercice.TriedTeamCount(),
 					}
diff --git a/admin/static/js/app.js b/admin/static/js/app.js
index 004334c7..0f73a351 100644
--- a/admin/static/js/app.js
+++ b/admin/static/js/app.js
@@ -275,7 +275,7 @@ angular.module("FICApp")
 	    $scope.exercice = Exercice.get({ exerciceId: $routeParams.exerciceId });
 	}
 	$scope.exercices = Exercice.query();
-	$scope.fields = ["title", "statement", "depend", "gain", "videoURI"];
+	$scope.fields = ["title", "statement", "depend", "gain", "coefficient", "videoURI"];
 
 	$scope.saveExercice = function() {
 	    if (this.exercice.id) {
diff --git a/libfic/db.go b/libfic/db.go
index 62f1c26a..3c1e2d0a 100644
--- a/libfic/db.go
+++ b/libfic/db.go
@@ -66,6 +66,7 @@ CREATE TABLE IF NOT EXISTS exercices(
   statement TEXT NOT NULL,
   depend INTEGER,
   gain INTEGER NOT NULL,
+  coefficient_cur FLOAT NOT NULL DEFAULT 1.0,
   video_uri VARCHAR(255) NOT NULL,
   FOREIGN KEY(id_theme) REFERENCES themes(id_theme),
   FOREIGN KEY(depend) REFERENCES exercices(id_exercice)
@@ -126,7 +127,7 @@ CREATE TABLE IF NOT EXISTS exercice_solved(
   id_exercice INTEGER NOT NULL,
   id_team INTEGER NOT NULL,
   time TIMESTAMP NOT NULL,
-  coefficient FLOAT NOT NULL,
+  coefficient FLOAT NOT NULL DEFAULT 1.0,
   FOREIGN KEY(id_exercice) REFERENCES exercices(id_exercice),
   FOREIGN KEY(id_team) REFERENCES teams(id_team)
 );
diff --git a/libfic/exercice.go b/libfic/exercice.go
index c237617c..f66faf69 100644
--- a/libfic/exercice.go
+++ b/libfic/exercice.go
@@ -8,17 +8,18 @@ import (
 var PartialValidation bool
 
 type Exercice struct {
-	Id        int64  `json:"id"`
-	Title     string `json:"title"`
-	Statement string `json:"statement"`
-	Depend    *int64 `json:"depend"`
-	Gain      int64  `json:"gain"`
-	VideoURI  string `json:"videoURI"`
+	Id          int64   `json:"id"`
+	Title       string  `json:"title"`
+	Statement   string  `json:"statement"`
+	Depend      *int64  `json:"depend"`
+	Gain        int64   `json:"gain"`
+	Coefficient float64 `json:"coefficient"`
+	VideoURI    string  `json:"videoURI"`
 }
 
 func GetExercice(id int64) (Exercice, error) {
 	var e Exercice
-	if err := DBQueryRow("SELECT id_exercice, title, statement, depend, gain, video_uri FROM exercices WHERE id_exercice = ?", id).Scan(&e.Id, &e.Title, &e.Statement, &e.Depend, &e.Gain, &e.VideoURI); err != nil {
+	if err := DBQueryRow("SELECT id_exercice, title, statement, depend, gain, coefficient_cur, video_uri FROM exercices WHERE id_exercice = ?", id).Scan(&e.Id, &e.Title, &e.Statement, &e.Depend, &e.Gain, &e.Coefficient, &e.VideoURI); err != nil {
 		return Exercice{}, err
 	}
 
@@ -27,7 +28,7 @@ func GetExercice(id int64) (Exercice, error) {
 
 func (t Theme) GetExercice(id int) (Exercice, error) {
 	var e Exercice
-	if err := DBQueryRow("SELECT id_exercice, title, statement, depend, gain, video_uri FROM exercices WHERE id_theme = ? AND id_exercice = ?", t.Id, id).Scan(&e.Id, &e.Title, &e.Statement, &e.Depend, &e.Gain, &e.VideoURI); err != nil {
+	if err := DBQueryRow("SELECT id_exercice, title, statement, depend, gain, coefficient_cur, video_uri FROM exercices WHERE id_theme = ? AND id_exercice = ?", t.Id, id).Scan(&e.Id, &e.Title, &e.Statement, &e.Depend, &e.Gain, &e.Coefficient, &e.VideoURI); err != nil {
 		return Exercice{}, err
 	}
 
@@ -35,7 +36,7 @@ func (t Theme) GetExercice(id int) (Exercice, error) {
 }
 
 func GetExercices() ([]Exercice, error) {
-	if rows, err := DBQuery("SELECT id_exercice, title, statement, depend, gain, video_uri FROM exercices"); err != nil {
+	if rows, err := DBQuery("SELECT id_exercice, title, statement, depend, gain, coefficient_cur, video_uri FROM exercices"); err != nil {
 		return nil, err
 	} else {
 		defer rows.Close()
@@ -43,7 +44,7 @@ func GetExercices() ([]Exercice, error) {
 		var exos = make([]Exercice, 0)
 		for rows.Next() {
 			var e Exercice
-			if err := rows.Scan(&e.Id, &e.Title, &e.Statement, &e.Depend, &e.Gain, &e.VideoURI); err != nil {
+			if err := rows.Scan(&e.Id, &e.Title, &e.Statement, &e.Depend, &e.Gain, &e.Coefficient, &e.VideoURI); err != nil {
 				return nil, err
 			}
 			exos = append(exos, e)
@@ -57,7 +58,7 @@ func GetExercices() ([]Exercice, error) {
 }
 
 func (t Theme) GetExercices() ([]Exercice, error) {
-	if rows, err := DBQuery("SELECT id_exercice, title, statement, depend, gain, video_uri FROM exercices WHERE id_theme = ?", t.Id); err != nil {
+	if rows, err := DBQuery("SELECT id_exercice, title, statement, depend, gain, coefficient_cur, video_uri FROM exercices WHERE id_theme = ?", t.Id); err != nil {
 		return nil, err
 	} else {
 		defer rows.Close()
@@ -65,7 +66,7 @@ func (t Theme) GetExercices() ([]Exercice, error) {
 		var exos = make([]Exercice, 0)
 		for rows.Next() {
 			var e Exercice
-			if err := rows.Scan(&e.Id, &e.Title, &e.Statement, &e.Depend, &e.Gain, &e.VideoURI); err != nil {
+			if err := rows.Scan(&e.Id, &e.Title, &e.Statement, &e.Depend, &e.Gain, &e.Coefficient, &e.VideoURI); err != nil {
 				return nil, err
 			}
 			exos = append(exos, e)
@@ -91,15 +92,15 @@ func (t Theme) AddExercice(title string, statement string, depend *Exercice, gai
 		return Exercice{}, err
 	} else {
 		if depend == nil {
-			return Exercice{eid, title, statement, nil, gain, videoURI}, nil
+			return Exercice{eid, title, statement, nil, gain, 1.0, videoURI}, nil
 		} else {
-			return Exercice{eid, title, statement, &depend.Id, gain, videoURI}, nil
+			return Exercice{eid, title, statement, &depend.Id, gain, 1.0, videoURI}, nil
 		}
 	}
 }
 
 func (e Exercice) Update() (int64, error) {
-	if res, err := DBExec("UPDATE exercices SET title = ?, statement = ?, depend = ?, gain = ?, video_uri = ? WHERE id_exercice = ?", e.Title, e.Statement, e.Depend, e.Gain, e.VideoURI, e.Id); err != nil {
+	if res, err := DBExec("UPDATE exercices SET title = ?, statement = ?, depend = ?, gain = ?, coefficient_cur = ?, video_uri = ? WHERE id_exercice = ?", e.Title, e.Statement, e.Depend, e.Gain, e.Coefficient, e.VideoURI, e.Id); err != nil {
 		return 0, err
 	} else if nb, err := res.RowsAffected(); err != nil {
 		return 0, err
@@ -157,7 +158,7 @@ func (e Exercice) NewTry(t Team) error {
 }
 
 func (e Exercice) Solved(t Team) error {
-	if _, err := DBExec("INSERT INTO exercice_solved (id_exercice, id_team, time) VALUES (?, ?, ?)", e.Id, t.Id, time.Now()); err != nil {
+	if _, err := DBExec("INSERT INTO exercice_solved (id_exercice, id_team, time, coefficient) VALUES (?, ?, ?, ?)", e.Id, t.Id, time.Now(), e.Coefficient); err != nil {
 		return err
 	} else {
 		return nil
diff --git a/libfic/stats.go b/libfic/stats.go
index 8ec8bdcc..1cbbe600 100644
--- a/libfic/stats.go
+++ b/libfic/stats.go
@@ -13,7 +13,7 @@ var SubmissionCostBase = 0.5
 
 func (t Team) GetPoints() (float64, error) {
 	var nb *float64
-	err := DBQueryRow("SELECT SUM(A.points * A.coeff) AS score FROM (SELECT S.id_team, E.gain AS points, coeff FROM (SELECT id_team, id_exercice, MIN(time) AS time, " + fmt.Sprintf("%f", FirstBlood) + " AS coeff FROM exercice_solved GROUP BY id_exercice UNION SELECT id_team, id_exercice, time, 1 AS coeff FROM exercice_solved) S INNER JOIN exercices E ON S.id_exercice = E.id_exercice UNION ALL SELECT D.id_team, H.cost AS points, -1.0 AS coeff FROM team_hints D INNER JOIN exercice_hints H ON H.id_hint = D.id_hint UNION ALL SELECT id_team, ((FLOOR(COUNT(*)/10 - 1) * (FLOOR(COUNT(*)/10)))/0.2 + (FLOOR(COUNT(*)/10) * (COUNT(*)%10)))/" + fmt.Sprintf("%f", 1/SubmissionCostBase) + " AS points, -1 AS coeff FROM exercice_tries GROUP BY id_exercice HAVING points != 0) A WHERE A.id_team = ? GROUP BY A.id_team", t.Id).Scan(&nb)
+	err := DBQueryRow("SELECT SUM(A.points * A.coeff) AS score FROM (SELECT S.id_team, E.gain AS points, coeff FROM (SELECT id_team, id_exercice, MIN(time) AS time, " + fmt.Sprintf("%f", FirstBlood) + " AS coeff FROM exercice_solved GROUP BY id_exercice UNION SELECT id_team, id_exercice, time, coefficient AS coeff FROM exercice_solved) S INNER JOIN exercices E ON S.id_exercice = E.id_exercice UNION ALL SELECT D.id_team, H.cost AS points, -1.0 AS coeff FROM team_hints D INNER JOIN exercice_hints H ON H.id_hint = D.id_hint UNION ALL SELECT id_team, ((FLOOR(COUNT(*)/10 - 1) * (FLOOR(COUNT(*)/10)))/0.2 + (FLOOR(COUNT(*)/10) * (COUNT(*)%10)))/" + fmt.Sprintf("%f", 1/SubmissionCostBase) + " AS points, -1 AS coeff FROM exercice_tries GROUP BY id_exercice HAVING points != 0) A WHERE A.id_team = ? GROUP BY A.id_team", t.Id).Scan(&nb)
 	if nb != nil {
 		return *nb, err
 	} else {
@@ -22,7 +22,7 @@ func (t Team) GetPoints() (float64, error) {
 }
 
 func GetRank() (map[int64]int, error) {
-	if rows, err := DBQuery("SELECT A.id_team, SUM(A.points * A.coeff) AS score, MAX(A.time) AS time FROM (SELECT S.id_team, S.time, E.gain AS points, coeff FROM (SELECT id_team, id_exercice, MIN(time) AS time, " + fmt.Sprintf("%f", FirstBlood) + " AS coeff FROM exercice_solved GROUP BY id_exercice UNION SELECT id_team, id_exercice, time, 1 AS coeff FROM exercice_solved) S INNER JOIN exercices E ON S.id_exercice = E.id_exercice UNION ALL SELECT D.id_team, D.time, H.cost AS points, -1.0 AS coeff FROM team_hints D INNER JOIN exercice_hints H ON H.id_hint = D.id_hint UNION ALL SELECT id_team, MAX(time) AS time, ((FLOOR(COUNT(*)/10 - 1) * (FLOOR(COUNT(*)/10)))/0.2 + (FLOOR(COUNT(*)/10) * (COUNT(*)%10)))/" + fmt.Sprintf("%f", 1/SubmissionCostBase) + " AS points, -1 AS coeff FROM exercice_tries GROUP BY id_exercice HAVING points != 0) A GROUP BY A.id_team ORDER BY score DESC, time ASC"); err != nil {
+	if rows, err := DBQuery("SELECT A.id_team, SUM(A.points * A.coeff) AS score, MAX(A.time) AS time FROM (SELECT S.id_team, S.time, E.gain AS points, coeff FROM (SELECT id_team, id_exercice, MIN(time) AS time, " + fmt.Sprintf("%f", FirstBlood) + " AS coeff FROM exercice_solved GROUP BY id_exercice UNION SELECT id_team, id_exercice, time, coefficient AS coeff FROM exercice_solved) S INNER JOIN exercices E ON S.id_exercice = E.id_exercice UNION ALL SELECT D.id_team, D.time, H.cost AS points, -1.0 AS coeff FROM team_hints D INNER JOIN exercice_hints H ON H.id_hint = D.id_hint UNION ALL SELECT id_team, MAX(time) AS time, ((FLOOR(COUNT(*)/10 - 1) * (FLOOR(COUNT(*)/10)))/0.2 + (FLOOR(COUNT(*)/10) * (COUNT(*)%10)))/" + fmt.Sprintf("%f", 1/SubmissionCostBase) + " AS points, -1 AS coeff FROM exercice_tries GROUP BY id_exercice HAVING points != 0) A GROUP BY A.id_team ORDER BY score DESC, time ASC"); err != nil {
 		return nil, err
 	} else {
 		defer rows.Close()
diff --git a/libfic/theme.go b/libfic/theme.go
index 7b2edeaa..3956fbee 100644
--- a/libfic/theme.go
+++ b/libfic/theme.go
@@ -72,10 +72,11 @@ func (t Theme) Delete() (int64, error) {
 }
 
 type ExportedExercice struct {
-	Title  string `json:"title"`
-	Gain   int64  `json:"gain"`
-	Solved int64  `json:"solved"`
-	Tried  int64  `json:"tried"`
+	Title  string  `json:"title"`
+	Gain   int64   `json:"gain"`
+	Coeff  float64 `json:"curcoeff"`
+	Solved int64   `json:"solved"`
+	Tried  int64   `json:"tried"`
 }
 
 type exportedTheme struct {
@@ -98,6 +99,7 @@ func ExportThemes() (interface{}, error) {
 					exos[fmt.Sprintf("%d", exercice.Id)] = ExportedExercice{
 						exercice.Title,
 						exercice.Gain,
+						exercice.Coefficient,
 						exercice.SolvedCount(),
 						exercice.TriedTeamCount(),
 					}