Mine

      if(lig > 3) {
         if(pos > 3) {
            while (tab[lig][pos]==comparer) {
               pos--;
               lig--;
            }
            if(lig < 4 && posDepart < tab[0].length - 3){
               if(tab[lig+1][pos] == comparer && tab[lig+2][pos+1] == comparer && tab[lig+3][pos+2] == comparer){valide = true;}
            }
            else if(posDepart < tab[0].length - 3){
               if(tab[lig-1][pos] == comparer && tab[lig-2][pos+1] == comparer && tab[lig-3][pos+2] == comparer){valide = true;}
            }
         }
         
      }