diff --git a/admin/static/js/app.js b/admin/static/js/app.js
index 0f73a351..32a8c721 100644
--- a/admin/static/js/app.js
+++ b/admin/static/js/app.js
@@ -379,7 +379,7 @@ angular.module("FICApp")
 	$scope.my.$promise.then(function(res){
 	    $scope.solved_exercices = 0;
 	    angular.forEach(res.exercices, function(exercice, eid) {
-		if (exercice.solved) {
+		if (exercice.solved_rank) {
 		    $scope.solved_exercices += 1;
 		}
 	    }, 0);
diff --git a/admin/static/views/exercice.html b/admin/static/views/exercice.html
index a95ea5d3..201a0c8d 100644
--- a/admin/static/views/exercice.html
+++ b/admin/static/views/exercice.html
@@ -4,8 +4,9 @@
   <div class="form-group" ng-repeat="field in fields">
     <label for="{{ field }}" class="col-xs-1 control-label">{{ field | capitalize }}</label>
     <div class="col-xs-11">
-      <input type="text" class="form-control" id="{{ field }}" ng-model="exercice[field]" ng-show="field != 'statement' && field != 'depend' && field != 'gain'">
+      <input type="text" class="form-control" id="{{ field }}" ng-model="exercice[field]" ng-show="field != 'statement' && field != 'depend' && field != 'gain' && field != 'coefficient'">
       <input type="text" class="form-control" id="{{ field }}" ng-model="exercice[field]" ng-show="field == 'gain'" integer>
+      <input type="text" class="form-control" id="{{ field }}" ng-model="exercice[field]" ng-show="field == 'coefficient'" float>
       <textarea class="form-control" id="{{field}}" ng-model="exercice[field]" ng-show="field == 'statement'"></textarea>
       <select class="form-control" id="{{field}}" ng-model="exercice[field]" ng-options="ex.id as ex.title for ex in exercices" ng-show="field == 'depend'">
 	<option value="">Aucune</option>
diff --git a/frontend/static/js/challenge.js b/frontend/static/js/challenge.js
index 2dbad794..774e7101 100644
--- a/frontend/static/js/challenge.js
+++ b/frontend/static/js/challenge.js
@@ -89,16 +89,25 @@ angular.module("FICApp", ["ngRoute", "ngSanitize"])
 		    time.he = (new Date()).getTime();
 		    sessionStorage.userService = angular.toJson(time);
 		});
+		$http.get("/settings.json").success(function(settings) {
+		    $scope.settings = settings;
+		});
 		$http.get("/themes.json").success(function(themes) {
 		    $scope.themes = themes;
 		    $scope.max_gain = 0;
+		    $scope.max_solved = 0;
 		    angular.forEach(themes, function(theme, key) {
 			this[key].exercice_count = Object.keys(theme.exercices).length;
+			this[key].exercice_coeff_max = 0;
 			this[key].gain = 0;
+			this[key].solved = 0;
 			angular.forEach(theme.exercices, function(ex, k) {
 			    this.gain += ex.gain;
+			    this.solved += ex.solved;
+			    this.exercice_coeff_max = Math.max(this.exercice_coeff_max, ex.curcoeff);
 			}, theme);
 			$scope.max_gain += theme.gain;
+			$scope.max_solved = Math.max($scope.max_solved, theme.solved);
 		    }, themes);
 		    actMenu();
 		});
@@ -116,6 +125,7 @@ angular.module("FICApp", ["ngRoute", "ngSanitize"])
 	    $http.get("/my.json").success(function(my) {
 		$scope.my = my;
 		angular.forEach($scope.my.exercices, function(exercice, eid) {
+		    exercice.solved = exercice.solved_rank > 0;
 		    if (exercice.video_uri) {
 			exercice.video_uri = $sce.trustAsResourceUrl(exercice.video_uri);
 		    }
diff --git a/frontend/static/js/common.js b/frontend/static/js/common.js
index 8156d436..4249ff41 100644
--- a/frontend/static/js/common.js
+++ b/frontend/static/js/common.js
@@ -69,3 +69,15 @@ angular.module("FICApp")
 	    return (Math.round(res * 100) / 100) + " " + units[unit];
 	}
     })
+
+    .filter("coeff", function() {
+	return function(input) {
+	    if (input > 1) {
+		return "+" + Math.floor((input - 1) * 100) + " %"
+	    } else if (input < 1) {
+		return "-" + Math.floor((1 - input) * 100) + " %"
+	    } else {
+		return "";
+	    }
+	}
+    })
diff --git a/frontend/static/views/theme.html b/frontend/static/views/theme.html
index d3088f41..5581eed4 100644
--- a/frontend/static/views/theme.html
+++ b/frontend/static/views/theme.html
@@ -1,5 +1,5 @@
 	  <ul class="nav nav-tabs nav-justified">
-	    <li ng-repeat="(k,exercice) in themes[current_theme].exercices" ng-class="{active: k == current_exercice, disabled: !my.exercices[k]}"><a ng-show="(!my.exercices[k])">{{ exercice.title }}</a><a ng-href="/{{ current_theme }}/{{ k }}" ng-show="(my.exercices[k])">{{ exercice.title }} <span class="glyphicon glyphicon-ok" aria-hidden="true" ng-show="(my.team_id && my.exercices[k].solved)"></span></a></li>
+	    <li ng-repeat="(k,exercice) in themes[current_theme].exercices" ng-class="{active: k == current_exercice, disabled: !my.exercices[k]}"><a ng-show="(!my.exercices[k])">{{ exercice.title }}</a><a ng-href="/{{ current_theme }}/{{ k }}" ng-show="(my.exercices[k])">{{ exercice.title }} <span class="glyphicon glyphicon-gift" aria-hidden="true" ng-show="themes[current_theme].exercices[k].curcoeff > 1.0"></span> <span class="glyphicon glyphicon-ok" aria-hidden="true" ng-show="(my.team_id && my.exercices[k].solved)"></span></a></li>
 	  </ul>
 
 	  <div class="alert alert-warning" style="margin-top:15px;" ng-show="!(my.exercices[current_exercice])">
@@ -8,7 +8,7 @@
 	  <div style="margin-top: 15px" class="well well-lg" ng-show="(my.exercices[current_exercice])">
 	    <p ng-bind-html="my.exercices[current_exercice].statement"></p>
 	    <ul>
-	      <li><strong>Gain :</strong> <ng-pluralize count="themes[current_theme].exercices[current_exercice].gain" when="{'one': '{} point', 'other': '{} points'}"></ng-pluralize> <em ng-show="themes[current_theme].happy">+10% happy hour</em> <em ng-show="themes[current_theme].exercices[current_exercice].solved < 1">+15% first blood</em></li>
+	      <li><strong>Gain :</strong> <ng-pluralize count="themes[current_theme].exercices[current_exercice].gain" when="{'one': '{} point', 'other': '{} points'}"></ng-pluralize> <em ng-show="themes[current_theme].exercices[current_exercice].curcoeff != 1.0">{{ themes[current_theme].exercices[current_exercice].curcoeff | coeff }} happy hour</em> <em ng-show="themes[current_theme].exercices[current_exercice].solved < 1">{{ 1 + settings.firstBlood | coeff }} first blood</em></li>
 	      <li><strong>Résolu par :</strong> <ng-pluralize count="themes[current_theme].exercices[current_exercice].solved" when="{'0': 'aucune équipe', 'one': '{} équipe', 'other': '{} équipes'}"></ng-pluralize>.</li>
 	    </ul>
 	  </div>
@@ -46,8 +46,8 @@
 	    <div class="panel-heading">
 	      <div class="panel-title"><span class="glyphicon glyphicon-flag" aria-hidden="true"></span> Soumettre une solution</div>
 	    </div>
-	    <ul class="list-group" ng-show="(my.exercices[current_exercice].solved_number || my.exercices[current_exercice].submitted || sberr)">
-	      <li class="list-group-item text-warning" ng-show="my.exercices[current_exercice].solved_number"><ng-pluralize count="my.exercices[current_exercice].solved_number" when="{'one': '{} tentative effectuée', 'other': '{} tentatives effectuées'}"></ng-pluralize>. Dernière solution envoyée à {{ my.exercices[current_exercice].solved_time | date:"mediumTime" }}.</li>
+	    <ul class="list-group" ng-show="(my.exercices[current_exercice].tries || my.exercices[current_exercice].submitted || sberr)">
+	      <li class="list-group-item text-warning" ng-show="my.exercices[current_exercice].tries"><ng-pluralize count="my.exercices[current_exercice].tries" when="{'one': '{} tentative effectuée', 'other': '{} tentatives effectuées'}"></ng-pluralize>. Dernière solution envoyée à {{ my.exercices[current_exercice].solved_time | date:"mediumTime" }}.</li>
 	      <li class="list-group-item" ng-class="messageClass" ng-show="my.exercices[current_exercice].submitted || sberr"><strong ng-show="!sberr">Votre solution a bien été envoyée !</strong><strong ng-show="sberr">{{ sberr }}</strong> {{ message }}</li>
 	    </ul>
 	    <div class="panel-body" ng-show="!my.exercices[current_exercice].submitted || sberr">
@@ -69,7 +69,7 @@
 	      <div class="panel-title"><span class="glyphicon glyphicon-flag" aria-hidden="true"></span> Challenge réussi !</div>
 	    </div>
 	    <div class="panel-body">
-	      Vous êtes la {{ my.exercices[current_exercice].solved_number }}<sup><ng-pluralize count="my.exercices[current_exercice].solved_number" when="{'one': 're', 'other': 'e'}"></ng-pluralize></sup> équipe à avoir résolu ce challenge à {{ my.exercices[current_exercice].solved_time | date:"mediumTime" }}. Vous avez marqué <ng-pluralize count="themes[current_theme].exercices[current_exercice].gain" when="{'one': '{} point', 'other': '{} points'}"></ng-pluralize> !
+	      Vous êtes la {{ my.exercices[current_exercice].solved_rank }}<sup><ng-pluralize count="my.exercices[current_exercice].solved_rank" when="{'one': 're', 'other': 'e'}"></ng-pluralize></sup> équipe à avoir résolu ce challenge à {{ my.exercices[current_exercice].solved_time | date:"mediumTime" }}. Vous avez marqué <ng-pluralize count="my.exercices[current_exercice].gain" when="{'one': '{} point', 'other': '{} points'}"></ng-pluralize> !
 	    </div>
 	  </div>
 
diff --git a/libfic/team.go b/libfic/team.go
index bb3622c0..b5cd9a82 100644
--- a/libfic/team.go
+++ b/libfic/team.go
@@ -129,17 +129,23 @@ func (t Team) OpenHint(h EHint) (error) {
 	return err
 }
 
+func (t Team) CountTries(e Exercice) (int64, time.Time) {
+	var nb *int64
+	var tm *time.Time
+	if DBQueryRow("SELECT COUNT(id_exercice), MAX(time) FROM exercice_tries WHERE id_team = ? AND id_exercice = ?", t.Id, e.Id).Scan(&nb, &tm); tm == nil {
+		return 0, time.Unix(0, 0)
+	} else if nb == nil {
+		return 0, *tm
+	} else {
+		return *nb, *tm
+	}
+}
+
 func (t Team) HasSolved(e Exercice) (bool, time.Time, int64) {
 	var nb *int64
 	var tm *time.Time
 	if DBQueryRow("SELECT MIN(time) FROM exercice_solved WHERE id_team = ? AND id_exercice = ?", t.Id, e.Id).Scan(&tm); tm == nil {
-		if DBQueryRow("SELECT COUNT(id_exercice), MAX(time) FROM exercice_tries WHERE id_team = ? AND id_exercice = ?", t.Id, e.Id).Scan(&nb, &tm); tm == nil {
-			return false, time.Unix(0, 0), 0
-		} else if nb == nil {
-			return false, *tm, 0
-		} else {
-			return false, *tm, *nb
-		}
+		return false, time.Unix(0, 0), 0
 	} else if DBQueryRow("SELECT COUNT(id_exercice) FROM exercice_solved WHERE id_exercice = ? AND time < ?", e.Id, tm).Scan(&nb); nb == nil {
 		return true, *tm, 0
 	} else {
diff --git a/libfic/team_my.go b/libfic/team_my.go
index 242d0bb0..c44c8ca0 100644
--- a/libfic/team_my.go
+++ b/libfic/team_my.go
@@ -3,6 +3,7 @@ package fic
 import (
 	"encoding/hex"
 	"fmt"
+	"log"
 	"time"
 	"path"
 )
@@ -24,13 +25,13 @@ type myTeamExercice struct {
 	ThemeId      int          `json:"theme_id"`
 	Statement    string       `json:"statement"`
 	Hints        []myTeamHint `json:"hints"`
-	Gain         int64        `json:"gain"`
+	Gain         float64      `json:"gain"`
 	Files        []myTeamFile `json:"files"`
 	Keys         []string     `json:"keys"`
-	Solved       bool         `json:"solved"`
 	SolvedMat    []bool       `json:"solved_matrix"`
 	SolvedTime   time.Time    `json:"solved_time"`
-	SolvedNumber int64        `json:"solved_number"`
+	SolvedRank   int64        `json:"solved_rank"`
+	Tries        int64        `json:"tries"`
 	VideoURI     string       `json:"video_uri"`
 }
 type myTeam struct {
@@ -72,10 +73,24 @@ func MyJSONTeam(t *Team, started bool) (interface{}, error) {
 				exercice.Statement = e.Statement
 				if t == nil {
 					exercice.VideoURI = e.VideoURI
-					exercice.Solved = true
-					exercice.SolvedNumber = e.TriedCount()
+					exercice.SolvedRank = 1
+					exercice.Tries = e.TriedCount()
+					exercice.Gain = float64(e.Gain) * e.Coefficient
 				} else {
-					exercice.Solved, exercice.SolvedTime, exercice.SolvedNumber = t.HasSolved(e)
+					var solved bool
+					solved, exercice.SolvedTime, exercice.SolvedRank = t.HasSolved(e)
+
+					if solved {
+						exercice.Tries, _ = t.CountTries(e)
+					} else {
+						exercice.Tries, exercice.SolvedTime = t.CountTries(e)
+					}
+
+					if gain, err := e.EstimateGain(*t, solved); err == nil {
+						exercice.Gain = gain
+					} else {
+						log.Println("ERROR during gain estimation:", err)
+					}
 				}
 
 				// Expose exercice files