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Torneo de la NCAA: Número de tweets de Rothstein "Esto es marzo"

Market icon

Torneo de la NCAA: Número de tweets de Rothstein "Esto es marzo"

51–60 56%

71–80 37%

≤ 40 36%

61–70 36%

Polymarket
NEW

51–60 56%

71–80 37%

≤ 40 36%

61–70 36%

Polymarket
NEW

≤ 40

$0 Vol.

36%

41–50

$0 Vol.

35%

51–60

$2 Vol.

56%

61–70

$0 Vol.

36%

71–80

$0 Vol.

37%

81+

$0 Vol.

36%

This market will resolve according to the number of times Jon Rothstein (@JonRothstein) mentions "This is March" in a tweet posted on X between March 1, 2026, 12:00 AM ET and April 7, 2026, 2:00 AM ET. For the purposes of this market, only main feed posts, quote posts, and reposts will count. Only posts live at the listed time will count toward the final tally. Deleted posts or posts that were reposted and later un-reposted will NOT count. Text posted in images, memes, video, or any attachments will not qualify towards the final count. Any plural or possessive forms of the listed term, as well as variance in capitalizations, will count toward the resolution of this market, regardless of context. Other forms of the listed term will NOT count. Extraneous symbols being inserted into a word (ex: Th1s, for "this") will disqualify it from counting toward the final count. Misspellings or iterations of the listed term, including all grammatical or slang forms, or misspellings with extra, missing, or incorrect letters (ex: marchhh or mar., for ‘March’), will not count towards the final count, regardless of context or intent. Instances where the term is used in a compound word will count regardless of context (e.g. marchmadness mentions are not a compound word for "march"). Instances where both the quote and the quoted post contain the relevant phrase will qualify as one mention. (e.g., if John quotes a post which contains "This is March" with his own text containing "This is March", it will qualify as one mention.) If the relevant data is unavailable by April 20, 2026, 11:59 PM ET, this market will resolve to the lowest bracket. The resolution source for this market will be Jon Rothstein’s verified X account: @JonRothstein. Please note, only the @JonRothstein verified X account counts for this market, regardless of the URL for this profile. If Jon Rothstein posts from another account, it has no bearing on the resolution of this market.This market will resolve according to the number of times Jon Rothstein (@JonRothstein) mentions "This is March" in a tweet posted on X between March 1, 2026, 12:00 AM ET and April 7, 2026, 2:00 AM ET. For the purposes of this market, only main feed posts, quote posts, and reposts will count. Only posts live at the listed time will count toward the final tally. Deleted posts or posts that were reposted and later un-reposted will NOT count. Text posted in images, memes, video, or any attachments will not qualify towards the final count. Any plural or possessive forms of the listed term, as well as variance in capitalizations, will count toward the resolution of this market, regardless of context. Other forms of the listed term will NOT count. Extraneous symbols being inserted into a word (ex: Th1s, for "this") will disqualify it from counting toward the final count. Misspellings or iterations of the listed term, including all grammatical or slang forms, or misspellings with extra, missing, or incorrect letters (ex: marchhh or mar., for ‘March’), will not count towards the final count, regardless of context or intent. Instances where the term is used in a compound word will count regardless of context (e.g. marchmadness mentions are not a compound word for "march"). Instances where both the quote and the quoted post contain the relevant phrase will qualify as one mention. (e.g., if John quotes a post which contains "This is March" with his own text containing "This is March", it will qualify as one mention.) If the relevant data is unavailable by April 20, 2026, 11:59 PM ET, this market will resolve to the lowest bracket. The resolution source for this market will be Jon Rothstein’s verified X account: @JonRothstein. Please note, only the @JonRothstein verified X account counts for this market, regardless of the URL for this profile. If Jon Rothstein posts from another account, it has no bearing on the resolution of this market.This market will resolve according to the number of times Jon Rothstein (@JonRothstein) mentions "This is March" in a tweet posted on X between March 1, 2026, 12:00 AM ET and April 7, 2026, 2:00 AM ET. For the purposes of this market, only main feed posts, quote posts, and reposts will count. Only posts live at the listed time will count toward the final tally. Deleted posts or posts that were reposted and later un-reposted will NOT count. Text posted in images, memes, video, or any attachments will not qualify towards the final count. Any plural or possessive forms of the listed term, as well as variance in capitalizations, will count toward the resolution of this market, regardless of context. Other forms of the listed term will NOT count. Extraneous symbols being inserted into a word (ex: Th1s, for "this") will disqualify it from counting toward the final count. Misspellings or iterations of the listed term, including all grammatical or slang forms, or misspellings with extra, missing, or incorrect letters (ex: marchhh or mar., for ‘March’), will not count towards the final count, regardless of context or intent. Instances where the term is used in a compound word will count regardless of context (e.g. marchmadness mentions are not a compound word for "march"). Instances where both the quote and the quoted post contain the relevant phrase will qualify as one mention. (e.g., if John quotes a post which contains "This is March" with his own text containing "This is March", it will qualify as one mention.) If the relevant data is unavailable by April 20, 2026, 11:59 PM ET, this market will resolve to the lowest bracket. The resolution source for this market will be Jon Rothstein’s verified X account: @JonRothstein. Please note, only the @JonRothstein verified X account counts for this market, regardless of the URL for this profile. If Jon Rothstein posts from another account, it has no bearing on the resolution of this market.This market will resolve according to the number of times Jon Rothstein (@JonRothstein) mentions "This is March" in a tweet posted on X between March 1, 2026, 12:00 AM ET and April 7, 2026, 2:00 AM ET. For the purposes of this market, only main feed posts, quote posts, and reposts will count. Only posts live at the listed time will count toward the final tally. Deleted posts or posts that were reposted and later un-reposted will NOT count. Text posted in images, memes, video, or any attachments will not qualify towards the final count. Any plural or possessive forms of the listed term, as well as variance in capitalizations, will count toward the resolution of this market, regardless of context. Other forms of the listed term will NOT count. Extraneous symbols being inserted into a word (ex: Th1s, for "this") will disqualify it from counting toward the final count. Misspellings or iterations of the listed term, including all grammatical or slang forms, or misspellings with extra, missing, or incorrect letters (ex: marchhh or mar., for ‘March’), will not count towards the final count, regardless of context or intent. Instances where the term is used in a compound word will count regardless of context (e.g. marchmadness mentions are not a compound word for "march"). Instances where both the quote and the quoted post contain the relevant phrase will qualify as one mention. (e.g., if John quotes a post which contains "This is March" with his own text containing "This is March", it will qualify as one mention.) If the relevant data is unavailable by April 20, 2026, 11:59 PM ET, this market will resolve to the lowest bracket. The resolution source for this market will be Jon Rothstein’s verified X account: @JonRothstein. Please note, only the @JonRothstein verified X account counts for this market, regardless of the URL for this profile. If Jon Rothstein posts from another account, it has no bearing on the resolution of this market.This market will resolve according to the number of times Jon Rothstein (@JonRothstein) mentions "This is March" in a tweet posted on X between March 1, 2026, 12:00 AM ET and April 7, 2026, 2:00 AM ET. For the purposes of this market, only main feed posts, quote posts, and reposts will count. Only posts live at the listed time will count toward the final tally. Deleted posts or posts that were reposted and later un-reposted will NOT count. Text posted in images, memes, video, or any attachments will not qualify towards the final count. Any plural or possessive forms of the listed term, as well as variance in capitalizations, will count toward the resolution of this market, regardless of context. Other forms of the listed term will NOT count. Extraneous symbols being inserted into a word (ex: Th1s, for "this") will disqualify it from counting toward the final count. Misspellings or iterations of the listed term, including all grammatical or slang forms, or misspellings with extra, missing, or incorrect letters (ex: marchhh or mar., for ‘March’), will not count towards the final count, regardless of context or intent. Instances where the term is used in a compound word will count regardless of context (e.g. marchmadness mentions are not a compound word for "march"). Instances where both the quote and the quoted post contain the relevant phrase will qualify as one mention. (e.g., if John quotes a post which contains "This is March" with his own text containing "This is March", it will qualify as one mention.) If the relevant data is unavailable by April 20, 2026, 11:59 PM ET, this market will resolve to the lowest bracket. The resolution source for this market will be Jon Rothstein’s verified X account: @JonRothstein. Please note, only the @JonRothstein verified X account counts for this market, regardless of the URL for this profile. If Jon Rothstein posts from another account, it has no bearing on the resolution of this market.This market will resolve according to the number of times Jon Rothstein (@JonRothstein) mentions "This is March" in a tweet posted on X between March 1, 2026, 12:00 AM ET and April 7, 2026, 2:00 AM ET. For the purposes of this market, only main feed posts, quote posts, and reposts will count. Only posts live at the listed time will count toward the final tally. Deleted posts or posts that were reposted and later un-reposted will NOT count. Text posted in images, memes, video, or any attachments will not qualify towards the final count. Any plural or possessive forms of the listed term, as well as variance in capitalizations, will count toward the resolution of this market, regardless of context. Other forms of the listed term will NOT count. Extraneous symbols being inserted into a word (ex: Th1s, for "this") will disqualify it from counting toward the final count. Misspellings or iterations of the listed term, including all grammatical or slang forms, or misspellings with extra, missing, or incorrect letters (ex: marchhh or mar., for ‘March’), will not count towards the final count, regardless of context or intent. Instances where the term is used in a compound word will count regardless of context (e.g. marchmadness mentions are not a compound word for "march"). Instances where both the quote and the quoted post contain the relevant phrase will qualify as one mention. (e.g., if John quotes a post which contains "This is March" with his own text containing "This is March", it will qualify as one mention.) If the relevant data is unavailable by April 20, 2026, 11:59 PM ET, this market will resolve to the lowest bracket. The resolution source for this market will be Jon Rothstein’s verified X account: @JonRothstein. Please note, only the @JonRothstein verified X account counts for this market, regardless of the URL for this profile. If Jon Rothstein posts from another account, it has no bearing on the resolution of this market.

This market will resolve according to the number of times Jon Rothstein (@JonRothstein) mentions "This is March" in a tweet posted on X between March 1, 2026, 12:00 AM ET and April 7, 2026, 2:00 AM ET.

For the purposes of this market, only main feed posts, quote posts, and reposts will count.

Only posts live at the listed time will count toward the final tally. Deleted posts or posts that were reposted and later un-reposted will NOT count.

Text posted in images, memes, video, or any attachments will not qualify towards the final count.

Any plural or possessive forms of the listed term, as well as variance in capitalizations, will count toward the resolution of this market, regardless of context. Other forms of the listed term will NOT count.

Extraneous symbols being inserted into a word (ex: Th1s, for "this") will disqualify it from counting toward the final count.

Misspellings or iterations of the listed term, including all grammatical or slang forms, or misspellings with extra, missing, or incorrect letters (ex: marchhh or mar., for ‘March’), will not count towards the final count, regardless of context or intent.

Instances where the term is used in a compound word will count regardless of context (e.g. marchmadness mentions are not a compound word for "march").

Instances where both the quote and the quoted post contain the relevant phrase will qualify as one mention. (e.g., if John quotes a post which contains "This is March" with his own text containing "This is March", it will qualify as one mention.)

If the relevant data is unavailable by April 20, 2026, 11:59 PM ET, this market will resolve to the lowest bracket.

The resolution source for this market will be Jon Rothstein’s verified X account: @JonRothstein.

Please note, only the @JonRothstein verified X account counts for this market, regardless of the URL for this profile. If Jon Rothstein posts from another account, it has no bearing on the resolution of this market.
Volumen
$2
Fecha de finalización
Apr 7, 2026
Mercado abierto
Mar 12, 2026, 11:17 AM ET
This market will resolve according to the number of times Jon Rothstein (@JonRothstein) mentions "This is March" in a tweet posted on X between March 1, 2026, 12:00 AM ET and April 7, 2026, 2:00 AM ET. For the purposes of this market, only main feed posts, quote posts, and reposts will count. Only posts live at the listed time will count toward the final tally. Deleted posts or posts that were reposted and later un-reposted will NOT count. Text posted in images, memes, video, or any attachments will not qualify towards the final count. Any plural or possessive forms of the listed term, as well as variance in capitalizations, will count toward the resolution of this market, regardless of context. Other forms of the listed term will NOT count. Extraneous symbols being inserted into a word (ex: Th1s, for "this") will disqualify it from counting toward the final count. Misspellings or iterations of the listed term, including all grammatical or slang forms, or misspellings with extra, missing, or incorrect letters (ex: marchhh or mar., for ‘March’), will not count towards the final count, regardless of context or intent. Instances where the term is used in a compound word will count regardless of context (e.g. marchmadness mentions are not a compound word for "march"). Instances where both the quote and the quoted post contain the relevant phrase will qualify as one mention. (e.g., if John quotes a post which contains "This is March" with his own text containing "This is March", it will qualify as one mention.) If the relevant data is unavailable by April 20, 2026, 11:59 PM ET, this market will resolve to the lowest bracket. The resolution source for this market will be Jon Rothstein’s verified X account: @JonRothstein. Please note, only the @JonRothstein verified X account counts for this market, regardless of the URL for this profile. If Jon Rothstein posts from another account, it has no bearing on the resolution of this market.
This market will resolve according to the number of times Jon Rothstein (@JonRothstein) mentions "This is March" in a tweet posted on X between March 1, 2026, 12:00 AM ET and April 7, 2026, 2:00 AM ET. For the purposes of this market, only main feed posts, quote posts, and reposts will count. Only posts live at the listed time will count toward the final tally. Deleted posts or posts that were reposted and later un-reposted will NOT count. Text posted in images, memes, video, or any attachments will not qualify towards the final count. Any plural or possessive forms of the listed term, as well as variance in capitalizations, will count toward the resolution of this market, regardless of context. Other forms of the listed term will NOT count. Extraneous symbols being inserted into a word (ex: Th1s, for "this") will disqualify it from counting toward the final count. Misspellings or iterations of the listed term, including all grammatical or slang forms, or misspellings with extra, missing, or incorrect letters (ex: marchhh or mar., for ‘March’), will not count towards the final count, regardless of context or intent. Instances where the term is used in a compound word will count regardless of context (e.g. marchmadness mentions are not a compound word for "march"). Instances where both the quote and the quoted post contain the relevant phrase will qualify as one mention. (e.g., if John quotes a post which contains "This is March" with his own text containing "This is March", it will qualify as one mention.) If the relevant data is unavailable by April 20, 2026, 11:59 PM ET, this market will resolve to the lowest bracket. The resolution source for this market will be Jon Rothstein’s verified X account: @JonRothstein. Please note, only the @JonRothstein verified X account counts for this market, regardless of the URL for this profile. If Jon Rothstein posts from another account, it has no bearing on the resolution of this market.This market will resolve according to the number of times Jon Rothstein (@JonRothstein) mentions "This is March" in a tweet posted on X between March 1, 2026, 12:00 AM ET and April 7, 2026, 2:00 AM ET. For the purposes of this market, only main feed posts, quote posts, and reposts will count. Only posts live at the listed time will count toward the final tally. Deleted posts or posts that were reposted and later un-reposted will NOT count. Text posted in images, memes, video, or any attachments will not qualify towards the final count. Any plural or possessive forms of the listed term, as well as variance in capitalizations, will count toward the resolution of this market, regardless of context. Other forms of the listed term will NOT count. Extraneous symbols being inserted into a word (ex: Th1s, for "this") will disqualify it from counting toward the final count. Misspellings or iterations of the listed term, including all grammatical or slang forms, or misspellings with extra, missing, or incorrect letters (ex: marchhh or mar., for ‘March’), will not count towards the final count, regardless of context or intent. Instances where the term is used in a compound word will count regardless of context (e.g. marchmadness mentions are not a compound word for "march"). Instances where both the quote and the quoted post contain the relevant phrase will qualify as one mention. (e.g., if John quotes a post which contains "This is March" with his own text containing "This is March", it will qualify as one mention.) If the relevant data is unavailable by April 20, 2026, 11:59 PM ET, this market will resolve to the lowest bracket. The resolution source for this market will be Jon Rothstein’s verified X account: @JonRothstein. Please note, only the @JonRothstein verified X account counts for this market, regardless of the URL for this profile. If Jon Rothstein posts from another account, it has no bearing on the resolution of this market.This market will resolve according to the number of times Jon Rothstein (@JonRothstein) mentions "This is March" in a tweet posted on X between March 1, 2026, 12:00 AM ET and April 7, 2026, 2:00 AM ET. For the purposes of this market, only main feed posts, quote posts, and reposts will count. Only posts live at the listed time will count toward the final tally. Deleted posts or posts that were reposted and later un-reposted will NOT count. Text posted in images, memes, video, or any attachments will not qualify towards the final count. Any plural or possessive forms of the listed term, as well as variance in capitalizations, will count toward the resolution of this market, regardless of context. Other forms of the listed term will NOT count. Extraneous symbols being inserted into a word (ex: Th1s, for "this") will disqualify it from counting toward the final count. Misspellings or iterations of the listed term, including all grammatical or slang forms, or misspellings with extra, missing, or incorrect letters (ex: marchhh or mar., for ‘March’), will not count towards the final count, regardless of context or intent. Instances where the term is used in a compound word will count regardless of context (e.g. marchmadness mentions are not a compound word for "march"). Instances where both the quote and the quoted post contain the relevant phrase will qualify as one mention. (e.g., if John quotes a post which contains "This is March" with his own text containing "This is March", it will qualify as one mention.) If the relevant data is unavailable by April 20, 2026, 11:59 PM ET, this market will resolve to the lowest bracket. The resolution source for this market will be Jon Rothstein’s verified X account: @JonRothstein. Please note, only the @JonRothstein verified X account counts for this market, regardless of the URL for this profile. If Jon Rothstein posts from another account, it has no bearing on the resolution of this market.This market will resolve according to the number of times Jon Rothstein (@JonRothstein) mentions "This is March" in a tweet posted on X between March 1, 2026, 12:00 AM ET and April 7, 2026, 2:00 AM ET. For the purposes of this market, only main feed posts, quote posts, and reposts will count. Only posts live at the listed time will count toward the final tally. Deleted posts or posts that were reposted and later un-reposted will NOT count. Text posted in images, memes, video, or any attachments will not qualify towards the final count. Any plural or possessive forms of the listed term, as well as variance in capitalizations, will count toward the resolution of this market, regardless of context. Other forms of the listed term will NOT count. Extraneous symbols being inserted into a word (ex: Th1s, for "this") will disqualify it from counting toward the final count. Misspellings or iterations of the listed term, including all grammatical or slang forms, or misspellings with extra, missing, or incorrect letters (ex: marchhh or mar., for ‘March’), will not count towards the final count, regardless of context or intent. Instances where the term is used in a compound word will count regardless of context (e.g. marchmadness mentions are not a compound word for "march"). Instances where both the quote and the quoted post contain the relevant phrase will qualify as one mention. (e.g., if John quotes a post which contains "This is March" with his own text containing "This is March", it will qualify as one mention.) If the relevant data is unavailable by April 20, 2026, 11:59 PM ET, this market will resolve to the lowest bracket. The resolution source for this market will be Jon Rothstein’s verified X account: @JonRothstein. Please note, only the @JonRothstein verified X account counts for this market, regardless of the URL for this profile. If Jon Rothstein posts from another account, it has no bearing on the resolution of this market.This market will resolve according to the number of times Jon Rothstein (@JonRothstein) mentions "This is March" in a tweet posted on X between March 1, 2026, 12:00 AM ET and April 7, 2026, 2:00 AM ET. For the purposes of this market, only main feed posts, quote posts, and reposts will count. Only posts live at the listed time will count toward the final tally. Deleted posts or posts that were reposted and later un-reposted will NOT count. Text posted in images, memes, video, or any attachments will not qualify towards the final count. Any plural or possessive forms of the listed term, as well as variance in capitalizations, will count toward the resolution of this market, regardless of context. Other forms of the listed term will NOT count. Extraneous symbols being inserted into a word (ex: Th1s, for "this") will disqualify it from counting toward the final count. Misspellings or iterations of the listed term, including all grammatical or slang forms, or misspellings with extra, missing, or incorrect letters (ex: marchhh or mar., for ‘March’), will not count towards the final count, regardless of context or intent. Instances where the term is used in a compound word will count regardless of context (e.g. marchmadness mentions are not a compound word for "march"). Instances where both the quote and the quoted post contain the relevant phrase will qualify as one mention. (e.g., if John quotes a post which contains "This is March" with his own text containing "This is March", it will qualify as one mention.) If the relevant data is unavailable by April 20, 2026, 11:59 PM ET, this market will resolve to the lowest bracket. The resolution source for this market will be Jon Rothstein’s verified X account: @JonRothstein. Please note, only the @JonRothstein verified X account counts for this market, regardless of the URL for this profile. If Jon Rothstein posts from another account, it has no bearing on the resolution of this market.This market will resolve according to the number of times Jon Rothstein (@JonRothstein) mentions "This is March" in a tweet posted on X between March 1, 2026, 12:00 AM ET and April 7, 2026, 2:00 AM ET. For the purposes of this market, only main feed posts, quote posts, and reposts will count. Only posts live at the listed time will count toward the final tally. Deleted posts or posts that were reposted and later un-reposted will NOT count. Text posted in images, memes, video, or any attachments will not qualify towards the final count. Any plural or possessive forms of the listed term, as well as variance in capitalizations, will count toward the resolution of this market, regardless of context. Other forms of the listed term will NOT count. Extraneous symbols being inserted into a word (ex: Th1s, for "this") will disqualify it from counting toward the final count. Misspellings or iterations of the listed term, including all grammatical or slang forms, or misspellings with extra, missing, or incorrect letters (ex: marchhh or mar., for ‘March’), will not count towards the final count, regardless of context or intent. Instances where the term is used in a compound word will count regardless of context (e.g. marchmadness mentions are not a compound word for "march"). Instances where both the quote and the quoted post contain the relevant phrase will qualify as one mention. (e.g., if John quotes a post which contains "This is March" with his own text containing "This is March", it will qualify as one mention.) If the relevant data is unavailable by April 20, 2026, 11:59 PM ET, this market will resolve to the lowest bracket. The resolution source for this market will be Jon Rothstein’s verified X account: @JonRothstein. Please note, only the @JonRothstein verified X account counts for this market, regardless of the URL for this profile. If Jon Rothstein posts from another account, it has no bearing on the resolution of this market.

Cuidado con los enlaces externos.

Preguntas frecuentes

"Torneo de la NCAA: Número de tweets de Rothstein "Esto es marzo"" es un mercado de predicción en Polymarket con 6 resultados posibles donde los operadores compran y venden acciones según lo que creen que sucederá. El resultado líder actual es "51–60" con 56%, seguido de "71–80" con 37%. Los precios reflejan probabilidades en tiempo real de la comunidad. Por ejemplo, una acción cotizada a 56¢ implica que el mercado colectivamente asigna una probabilidad de 56% a ese resultado. Estas probabilidades cambian continuamente a medida que los operadores reaccionan a nuevos desarrollos. Las acciones del resultado correcto son canjeables por $1 cada una tras la resolución del mercado.

"Torneo de la NCAA: Número de tweets de Rothstein "Esto es marzo"" es un mercado recién creado en Polymarket, lanzado el Mar 12, 2026. Como mercado nuevo, esta es tu oportunidad de ser uno de los primeros operadores en establecer las probabilidades y las señales de precio iniciales del mercado. También puedes guardar esta página en marcadores para seguir el volumen y la actividad de trading a medida que el mercado gana tracción.

Para operar en "Torneo de la NCAA: Número de tweets de Rothstein "Esto es marzo"", explora los 6 resultados disponibles en esta página. Cada resultado muestra un precio actual que representa la probabilidad implícita del mercado. Para tomar una posición, selecciona el resultado que consideres más probable, elige "Sí" para operar a favor o "No" para operar en contra, introduce tu cantidad y haz clic en "Operar". Si tu resultado elegido es correcto cuando el mercado se resuelve, tus acciones de "Sí" pagan $1 cada una. Si es incorrecto, pagan $0. También puedes vender tus acciones en cualquier momento antes de la resolución.

El favorito actual para "Torneo de la NCAA: Número de tweets de Rothstein "Esto es marzo"" es "51–60" con 56%, lo que significa que el mercado asigna una probabilidad de 56% a ese resultado. El siguiente resultado más cercano es "71–80" con 37%. Estas probabilidades se actualizan en tiempo real a medida que los operadores compran y venden acciones. Vuelve con frecuencia o guarda esta página en marcadores.

Las reglas de resolución para "Torneo de la NCAA: Número de tweets de Rothstein "Esto es marzo"" definen exactamente qué debe ocurrir para que cada resultado sea declarado ganador, incluyendo las fuentes de datos oficiales utilizadas para determinar el resultado. Puedes revisar los criterios de resolución completos en la sección "Reglas" en esta página sobre los comentarios. Recomendamos leer las reglas cuidadosamente antes de operar, ya que especifican las condiciones exactas, casos especiales y fuentes.