Since the Sambadrome at Marquês de Sapucaí opened in 1984, a striking trend has emerged regarding the performance of samba schools that ascend to the elite ranks of Carnival. According to data compiled by G1, in 42 Carnival parades, only six times have schools promoted from lower tiers managed to secure their position for the next year without being relegated. This underlines a competitive environment where many of the schools that rise through the ranks often face immediate challenges, with half of the promoted schools failing to stay in the elite group after just one year.

The investigation reveals a concerning pattern known as the 'yo-yo school' effect, where samba institutions oscillate between tiers frequently. In the past decade, the phenomenon has been particularly relevant, with only two schools, Imperatriz Leopoldinense in 2022 and Unidos do Viradouro in 2019, managing to maintain their elite status after promotion. This indicates a severe level of competition and the potential lack of stability for many of these schools, which can affect their planning and performance in subsequent years.

Additionally, the report also touches on the changes in the divisions of the carnival, highlighting the evolution in the naming and size of these tiers. The special group is recognized as the elite level, while the Série Ouro represents the tier just below it. Understanding the dynamics of promotion and relegation in Carnival reveals not only the competitive nature of this cultural event but also the implications it has for the schools involved, as they must continually adapt to survive the rigors of this esteemed Brazilian tradition.