The official regulations governing the competition are very detailed and somewhat complicated. For the full text in Portuguese click   here.  This is a summary:

Each night 21 or 22 items are chosen to be judged by 12 jury members. The minimum score awarded by each jury member is 7 and the maximum is 10, fractions are allowed.

The color of the opposing Bumbá may be used only in exceptional cases like an alegoria that naturally has to be blue or red. In all other circumstances its used is forbidden.

The items: “beauty”, “creativity”, “sympathy”, “originality” and “charisma” are judged in every single presentation. In addition to that, the following competition items are judged on additional item-specific criteria:

APRESENTADOR: Is the Master of Ceremonies. Must be able to command the arena as well the public, have oral fluency, excellent pronunciation, diction, cheerfulness, attention to all that happens inside the arena.

LEVANTADOR DE TOADAS: He is the singer. His voice carries the theme of the Boi . Must have good diction, voice timber and vocal techniques.

BATUCADA OU MARUJADA: Sustains the rhythm of the presentation. Serves as the basis of the spectacle furnishing rhythm to the toadas .

RITUAL INDÍGENA: Recreation of a shaman ritual within the folkloric context. The jury takes into account the dramatization and the created effects.

PORTA-ESTANDARTE: Represents the symbol of the Boi movement. She will have to show agility, elegance, cheerfulness, and skill in dancing with the flag.

AMO DO BOI: Is the owner of the farm. Needs good diction, agility and elegance, develop scenic expressions and be able to invent improvised poems.

SINHAZINHA DA FAZENDA: Is the daughter of the farm owner. Needs to the graceful, agile, simple and cheerfulness, saluting the ox and the public.

RAINHA DO FOLCLORE: Represents the “expression of power through popular manifestation”. Must be graceful, move with agility.

CUNHÃ-PORANGA: Represents the most beautiful woman of the tribe, a priestess and a warrior. She have to convey to the jury and the audience the power of her beauty. Must be a master of expression through dance, agile, and embody the character.

BOI BUMBÁ EVOLUÇÃO: It's the symbol of the “popular manifestation” (manifestação popular). Must have a visually correct shape. His movements must be choreographed to resemble the behavior of a real ox.

TOADA (LETRA E MÚSICA): Literary and musical “backbone” of the festival. Evaluated are the music, the text, and the performance.

PAJÉ: He is the shaman, a witchdoctor and a priest. Must exude confidence and dominate the scenic space.

TRIBOS INDÍGENAS: Presentation of an Amazonian native group. Issues to be considered: synchronicity of the movements, truthful representation of reality, colors, scenic expression, originality of movement.

PAI FRANCISCO E MÃE CATIRINA: Husband and wife, burlesque characters from the farm. Should present themselves comically, be funny and improvise.

TUXAUAS: These are the supreme tribal chiefs. Must wear richly detailed costume ( capacete ).

FIGURA TÍPICA REGIONAL: A symbol of the Amazonian culture that honors the roots of the region.

ALEGORIA: Artistic structure that serves as the scenery for the presentation. Issues to be considered: completion, execution, functionality and aesthetics.

LENDA AMAZÔNICA: Fiction that illustrates the culture and the folklore of the region. Evaluated are imagination, creativity and scenic evolution..

VAQUEIRADA: Guardian of the Boi . Principal attention is paid to choreography.

GALERA: The public cheering for a given Boi . Evaluated are cheerfulness, contagious energy, synchronization of actions.

ORGANIZAÇÃO E CONJUNTO FOLCLÓRICO - APOTEOSE: A collection of items: individual characters and groups in the context of the performance. Considered issues: harmony, dynamics of the presentations, freedom of movement in the arena and ability to maintain the timing of the presentation.

COREOGRAFIA: Choreography. Subject to evaluation are: dynamics, movement, rhythm and synchronicity.