Index: bb5/arbiter/SPlayer.cc
===================================================================
--- bb5/arbiter/SPlayer.cc	(rvision 1425)
+++ bb5/arbiter/SPlayer.cc	(copie de travail)
@@ -326,23 +326,15 @@
     setHasPlayed();
   else
     setHasBlocked();
-  
-  int mod_st_atk = getSt();
-  int mod_st_df = target_->getSt();
 
-  if (mod_st_atk > 2 * mod_st_df || mod_st_df > 2 * mod_st_atk)
-    nb_block_dices_ = 3;
-  else if (mod_st_atk != mod_st_df)
-    nb_block_dices_ = 2;
-  else
-    nb_block_dices_ = 1;
+  int dices = f_->getNbBlockDices(pos_, target_->pos_);
+  if (dices == 0) { ERR("target undefined or synchronisation error between field and players"); }
+  nb_block_dices_ = (dices < 0 ? dices * -1 : dices);
 
   if (nb_block_dices_ == 1)
     dice_chooser_id_ = -1;
-  else if (mod_st_atk < mod_st_df) // Strongest team chooses the dice.
-    dice_chooser_id_ = r_->getCurrentOpponentTeamId();
   else
-    dice_chooser_id_ = team_id_;
+    dice_chooser_id_ = (dices < 0 ? r_->getCurrentOpponentTeamId() : team_id_);
 
   roll_attempted_ = R_BLOCK;
   setRerollAvailability();
Index: bb5/common/Field.hh
===================================================================
--- bb5/common/Field.hh	(rvision 1425)
+++ bb5/common/Field.hh	(copie de travail)
@@ -97,6 +97,24 @@
   //! @param pos Position in field to look for.
   int           getNbTackleZones(int team_id, const Position& pos) const;
 
+  //! @brief Check if the player can assist a block against another player.
+  //! @param pos_assister The position of the player assisting.
+  //! @param team_id The team id of the team that tackles. (ie: The team of the target).
+  //! @param pos_target The position in field of the target (attacker or defender).
+  bool           canAssist(const Position& pos_assister, int team_id, const Position& pos_target) const;
+  //! @brief Get the number of supporter avaible for a block.
+  //! @param pos_assisted Position in field of the player being assisted.
+  //! @param team_id The team id of the team assister.
+  //! @param pos_target Position in field of the target (attacker or defender).
+  int           getNbAssister(const Position& pos_assisted, int team_id, const Position& pos_target) const;
+  //! @brief Get the number of dices to throz during a block.
+  //! @param pos_attacker Position in field of the player attacking.
+  //! @param pos_target Position in field of the defender.
+  //! @return A positif number is returned if his team attacking choose the result, else it is a negative one
+  //!   the absolute value determine the number of dice to roll
+  int           getNbBlockDices(const Position& pos_attacker, const Position& pos_target) const;
+
+
 protected:
   T*            tab_[COLS * ROWS];
 };
Index: bb5/common/Field.hxx
===================================================================
--- bb5/common/Field.hxx	(rvision 1425)
+++ bb5/common/Field.hxx	(copie de travail)
@@ -243,7 +243,58 @@
       if (intoField(p)
           && getPlayer(p) != NULL
           && getPlayer(p)->getTeamId() == team_id
-	  && getPlayer(p)->getStatus() == STA_STANDING)
+          && getPlayer(p)->getStatus() == STA_STANDING
+          && getPlayer(p)->hasTackleZone())
         res++;
   return res;
 }
+
+template <typename T>
+inline bool Field<T>::canAssist(const Position& pos_assister, int team_id, const Position& pos_target) const
+{
+  return (pos_assister.isNear(pos_target)
+     // && (getNbTackleZones(team_id, pos_assister)
+     //  || getPlayer(pos_assister)->hasSkill(SK_GUARD))
+      && getNbTackleZones(team_id, pos_assister) == 1
+      && getPlayer(pos_assister)->getStatus() == STA_STANDING
+      && getPlayer(pos_assister)->hasTackleZone());
+}
+
+template <typename T>
+inline int Field<T>::getNbAssister(const Position& pos_assisted, int team_id, const Position& pos_target) const
+{
+  int res = 0;
+  Position p;
+
+  for (p.row = pos_target.row - 1; p.row <= pos_target.row + 1; p.row++)
+    for (p.col = pos_target.col - 1; p.col <= pos_target.col + 1; p.col++)
+      if (intoField(p)
+          && getPlayer(p) != NULL
+          && p != pos_assisted
+          && getPlayer(p)->getTeamId() == team_id
+	      && canAssist(p, (team_id*-1)+1, pos_target))
+        res++;
+  return res;
+}
+
+template <typename T>
+inline int Field<T>::getNbBlockDices(const Position& pos_attacker, const Position& pos_target) const
+{
+  T* attacker;
+  T* target;
+
+  attacker = getPlayer(pos_attacker);
+  target = getPlayer(pos_target);
+  if (attacker == NULL || target == NULL) {
+    return 0;
+  }
+
+  // TODO
+  // When the extra rules (assiting a block) will be implenting the folowing comments could be removed
+  int mod_st_atk = attacker->getSt(); // + getNbAssister(pos_attacker, attacker->getTeamId(), pos_target);
+  int mod_st_df = target->getSt(); // + getNbAssister(pos_target, target->getTeamId(), pos_attacker);
+
+  return (mod_st_atk < mod_st_df ? -1 : 1) *
+    ((mod_st_atk > 2 * mod_st_df || mod_st_df > 2 * mod_st_atk) ? 3 :
+     (mod_st_atk != mod_st_df ? 2 : 1 ));
+}
Index: bb5/common/Player.hh
===================================================================
--- bb5/common/Player.hh	(rvision 1425)
+++ bb5/common/Player.hh	(copie de travail)
@@ -313,6 +313,14 @@
   //! @brief Mark the skill as used for this turn.
   void useSkill(enum eSkill skill);
 
+  //! @brief Check if this player has a tacle zone.
+  bool hasTackleZone() const;
+  //! @brief Set the 'has lost his tackle zone' marker
+  //!    with skills like "Bone-head" or "Really Stupid".
+  void lostTackleZone();
+  //! @brief Reset the tackle zone marker
+  void resetTackleZone();
+
   //! @brief Called on new turn.
   void resetTurn();
 
@@ -346,6 +354,8 @@
   enum eDeclaredAction action_;
   bool will_prone_;
 
+  bool has_tackle_zone_;
+
 private:
   SkillList	skill_list_; ///< List of skills that this player have.
   SkillList	used_skill_list_; ///< List of skills that this player have used this turn.
Index: bb5/common/Player.hxx
===================================================================
--- bb5/common/Player.hxx	(rvision 1425)
+++ bb5/common/Player.hxx	(copie de travail)
@@ -26,7 +26,8 @@
     has_blocked_(false),
     has_played_(false),
     action_(DCL_UNASSIGNED),
-    will_prone_(false)
+    will_prone_(false),
+    has_tackle_zone_(true)
 {
   name_ = packetToString(m->name);
 
@@ -152,6 +153,7 @@
   ma_remain_ = ma_;
   used_skill_list_.clear();
   will_prone_ = (status_ == STA_STUNNED);
+  resetTackleZone();
 }
 
 inline const char* Player::stringify(enum eStatus status)
@@ -221,3 +223,18 @@
   os << std::endl;
   return os;
 }
+
+inline bool Player::hasTackleZone() const
+{
+  return has_tackle_zone_;
+}
+
+inline void Player::lostTackleZone()
+{
+  has_tackle_zone_=false;
+}
+
+inline void Player::resetTackleZone()
+{
+  has_tackle_zone_=true;
+}
Index: bb5/client/Api.hxx
===================================================================
--- bb5/client/Api.hxx	(rvision 1425)
+++ bb5/client/Api.hxx	(copie de travail)
@@ -691,20 +691,10 @@
       || p->getTeamId() == selected_player_->getTeamId())
     return INVALID_ACTION;
 
-  // FIXME: Factorize the code to common/ since SPlayer uses the same.
-  if (selected_player_->getSt() == p->getSt())
-    return blockDicesNumberPadding() + 1;
+  int dices = rules_->field_->getNbBlockDices(selected_player_->getPosition(), to);
+  if (dices == 0) { ERR("target undefined or synchronisation error between field and players"); }
 
-  if (selected_player_->getSt() > 2 * p->getSt())
-    return blockDicesNumberPadding() + 3;
-
-  if (selected_player_->getSt() * 2 < p->getSt())
-    return blockDicesNumberPadding() - 3;
-
-  if (selected_player_->getSt() > p->getSt())
-    return blockDicesNumberPadding() + 2;
-  else
-    return blockDicesNumberPadding() - 2;
+  return blockDicesNumberPadding() + dices;
 }
 
 inline int Api::blockDicesNumberPadding() const