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void Game::PVP(const string& p_player) {
Player& e = *m_player;
   room r = e.CurrentRoom();
   sint64 now = Game::GetTimer().GetMS();   
   std::list<player>::iterator itr = r->Players().begin();
   Player& p = **itr;

    int damage;
    if( e.Weapon() == 0 )
    {
        damage = BasicLib::RandomInt( 1, 3 );
        e.NextAttackTime() = now + seconds( 1 );
    }
    else
    {
        damage = BasicLib::RandomInt( e.Weapon()->Min(), e.Weapon()->Max() );
        e.NextAttackTime() = now + seconds( e.Weapon()->Speed() );
    }
    if( BasicLib::RandomInt( 0, 99 ) >= e.GetAttr(ACCURACY) - p.GetAttr( DODGING ) )
    {
        Game::SendRoom(newline + yellow + e.Name() + " slashes at " + p.Name() + 
                        " but misses!", e.CurrentRoom() );
        return;
    }
    damage += e.GetAttr(STRIKEDAMAGE);
    damage -= p.GetAttr( DAMAGEABSORB );
    if( damage < 1 )
        damage = 1;
    p.AddHitpoints( -damage );
    Game::SendRoom(newline + red + e.Name() + " hits " + p.Name() + " and inflicts " + 
                    tostring( damage ) + " damage!", e.CurrentRoom() );
    if( p.HitPoints() <= 0 )
        PlayerKilled( p.ID() );
}

   std::list<player>::iterator itr = r->Players().begin();

std::list<player>::iterator itr;

for (itr = r->Players().begin(); itr != r->Players().end(); itr++)
  {
  Player& p = **itr;
  
  if (p.Name == "Nick")     // or whatever test
    break;

  }  // end of for loop   

if (itr == r->Players().end())
  {
  // error: wanted player not found
  return; 
  }

Player& p = **itr;

// attack player p

...

/usr/lib/gcc/x86_64-linux-gnu/4.4.5/../../../../lib/crt1.o:In
function `_start':
(.text+0x20): undefined reference to `main'
collect2: ld returned 1 exit status
make: *** [link] error 1