2021 Official Playing Rules of the National Football League
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National Basketball Association Scheduling Simulation
National Basketball Association Scheduling Simulation 21-393 Final Project, Fall 2016 Shengqi Chai, Yutong Li, Liyunshu Qian, Ming Yang Department of Mathematics Carnegie Mellon University Pittsburgh, PA 15213 Table of Contents I. Abstract II. Background and Problem Description III. Solution IV. Results V. Conclusion VI. Reference Page 1 of 12 I. Abstract Sport scheduling is a complex task in the presence of a myriad of conflicting requirements and preferences. In this work, our primary goal is to find a feasible and approximately optimal schedule in terms of travel distance for the 30 teams in National Basketball Association. We focus on the schedule for the regular season, which usually spans over a 5-month duration. Existing approaches to build a schedule from scratch tends to suffer from substantial runtime overhead. In particular, it is computationally infeasible to solve the problem directly using linear programming and constraint programming due to the complicate formats and rules for NBA scheduling. Thus for the sake of simplification, we adopted assumptions so that integer programming is applicable. Additionally, we approached the problem using divide and conquer to reduce computational complexity. Apart from Operations Research techniques, methods from Machine Learning and Data Collection are also exploited in finding the solution. Our approach yields reliable schedules in a reasonable runtime, and the algorithm should be applicable, with slight modifications, to any scheduling problems in single-round robin or double-round robin fashion. II. Problem Background National Basketball Association is the preeminent men’s professional basketball league in North America, and is widely considered as one of the best basketball leagues in the world. -
Football Officiating Manual
FOOTBALL OFFICIATING MANUAL 2020 HIGH SCHOOL SEASON TABLE OF CONTENTS PART ONE: OFFICIATING OVERVIEW .............................................................................. 1 INTRODUCTION ........................................................................................................................ 2 NATIONAL FEDERATION OFFICIALS CODE OF ETHICS ........................................... 3 PREREQUISITES AND PRINCIPLES OF GOOD OFFICIATING ................................. 4 PART TWO: OFFICIATING PHILOSOPHY ......................................................................... 6 WHEN IN QUESTION ............................................................................................................... 7 PHILOSOPHIES AND GUIDANCE ........................................................................................ 8 BLOCKING .................................................................................................................................... 8 A. Holding (OH / DH) ............................................................................................................. 8 B. Blocking Below the Waist (BBW) ..................................................................................... 8 CATCH / RECOVERY ................................................................................................................... 9 CLOCK MANAGEMENT ............................................................................................................. 9 A. Heat and Humidity Timeout ............................................................................................ -
Countdown to Kickoff (10 Days)
COUNTDOWN TO KICKOFF (10 DAYS) NEW NFL RULES FOR 2016 Rule changes are made each season to improve the game and make it safer. Recent rules changes and points of emphasis focused on player safety have resulted in defenders adjusting their target zone and using the proper tackling technique. In 2015, there were 10 players fined for hits on defenseless players, compared to 40 for the same offense in 2012. FINES FOR HITS ON DEFENSELESS PLAYERS SEASON FINES 2012 40 2013 25 2014 11 2015 10 With player health and safety remaining a priority, here are the 2016 rules changes and points of emphasis: CHOP BLOCK: All chop blocks are now illegal. A chop block is a two-man high-low block in which a defensive player is engaged above the waist by one offensive player and blocked at the thigh or below by a second offensive player. A chop block is a foul whether it occurs on a running play, a pass play or a kicking play. If it is clear that the defensive player is initiating the contact above the waist, or that the offensive player is trying to slip or escape, then the block is legal. UNSPORTSMANLIKE CONDUCT FOULS: A player that is penalized twice in the same game for certain types of unsportsmanlike conduct fouls will be automatically disqualified. These types of fouls include: o Throwing a punch or kick without making contact o Use of abusive or threatening language toward an opponent o Any act that constitutes taunting HORSE COLLAR: The horse collar rule has been expanded for this season. -
11-Player Youth Tackle Rules Guide Table of Contents
FOOTBALL DEVELOPMENT MODEL usafootball.com/fdm 11-PLAYER YOUTH TACKLE RULES GUIDE TABLE OF CONTENTS Introduction .....................................................................................................2 1 Youth Specific Rules ..........................................................................3 2 Points of Emphasis ............................................................................4 3 Timing and Quarter Length ...........................................................5 4 Different Rules, Different Levels ..................................................7 5 Penalties ..................................................................................................7 THANK YOU ESPN USA Football sincerely appreciates ESPN for their support of the Football Development Model Pilot Program INTRODUCTION Tackle football is a sport enjoyed by millions of young athletes across the United States. This USA Football Rules Guide is designed to take existing, commonly used rule books by the National Federation of State High School Associations (NFHS) and the NCAA and adapt them to the youth game. In most states, the NFHS rule book serves as the foundational rules system for the youth game. Some states, however, use the NCAA rule book for high school football and youth leagues. 2 2 / YOUTH-SPECIFIC RULES USA Football recommends the following rules be adopted by youth football leagues, replacing the current rules within the NFHS and NCAA books. Feel free to print this chart and provide it to your officials to take to the game field. NFHS RULE NFHS PENALTY YARDAGE USA FOOTBALL RULE EXPLANATION 9-4-5: Roughing/Running Into the Roughing = 15; Running Into = 5 All contact fouls on the kicker/holder Kicker/Holder result in a 15-yard penalty (there is no 5-yard option for running into the kicker or holder). 9-4-3-h: Grasping the Face Mask Grasping, pulling, twisting, turning = 15; All facemask fouls result in a 15-yard incidental grasping = 5 penalty (there is no 5-yard option for grasping but not twisting or pulling the facemask). -
Season Seat Holder Retention in Minor League Baseball
St. John Fisher College Fisher Digital Publications Sport Management Undergraduate Sport Management Department Spring 2013 Season Seat Holder Retention in Minor League Baseball Matt Butler St. John Fisher College Follow this and additional works at: https://fisherpub.sjfc.edu/sport_undergrad Part of the Sports Management Commons How has open access to Fisher Digital Publications benefited ou?y Recommended Citation Butler, Matt, "Season Seat Holder Retention in Minor League Baseball" (2013). Sport Management Undergraduate. Paper 93. Please note that the Recommended Citation provides general citation information and may not be appropriate for your discipline. To receive help in creating a citation based on your discipline, please visit http://libguides.sjfc.edu/citations. This document is posted at https://fisherpub.sjfc.edu/sport_undergrad/93 and is brought to you for free and open access by Fisher Digital Publications at St. John Fisher College. For more information, please contact [email protected]. Season Seat Holder Retention in Minor League Baseball Abstract In lieu of an abstract, here is the paper's first paragraph: In minor league (AAA) baseball the amount of season tickets sold for the season can account for at least fifteen percent of total paid attendance for the. With this in mind a sport manager may wonder what brings season ticket buyers back season after season, and what can be done to measure this occurrence. An added question for front office staff members is, do these reasons coincide with a team’s marketing strategy to maximize the amount of fans who buy season tickets? To analyze this occurrence I looked into exactly what behavior fans exhibit and their motivation to purchase. -
Flag Football Rules
Flag Football Rules Start of the Game Game time is starting time; there will be no grace period. The officials watch will be the timepiece used to decide game time. The referee shall toss a coin after designating which captain shall call the toss. The winner of the toss shall have first choice of the options for either the first or the second half. The loser shall have the first choice of options for the half the winner of the toss did not select. The options are: to choose whether a team will play offense (receive) or defense; or to choose the goal a team will defend. Teams automatically switch ends at the half. Game Time and Time Outs Games will be two 25-minute halves of running time. Only the last two minutes of the second half will be stopped for all dead ball situations – e.g. time-outs; penalties; change of possession; out of bound plays; incomplete passes; and all scores. Half time will be 2-minutes The offensive team has 15 seconds from the time the ball and restraining line are set by the officials to put the ball back into play. If the team exceeds 15 seconds, officials will call a delay of game penalty. A game or half cannot end on a defensive penalty unless the penalty is refused. Each team will be given two 30-second timeouts per half. Timeouts do not carry over from one half to the next. (See “Tie and Overtime” section, infra, for rules regarding overtime timeouts.) Passing All players are eligible to receive a pass. -
DIAA Football Clinic NFHS FOOTBALL RULES
2021 NFHS FOOTBALL RULES POWERPOINT National Federation of State High School Associations DIAA Football Clinic NFHS FOOTBALL RULES Each state high school association adopting these NFHS football rules is the sole and exclusive source of binding rules interpretations for contests involving its member schools. Any person having questions about the interpretation of NFHS football rules should contact the football rules interpreter designated by his or her state high school association. The NFHS is the sole and exclusive source of model interpretations of NFHS football rules. State rules interpreters may contact the NFHS for model football rules interpretations. No other model football rules interpretations should be considered. www.nfhs.org 2021 NFHS FOOTBALL RULES CHANGES Rule Change BLOCKING BELOW THE WAIST RULE 2-17-2c (NEW) In PlayPic A, both players are in the free-blocking zone and on their lines of scrimmage. In PlayPic B, the block is legal because it is in the zone at the time of the snap, is an immediate, initial action following the snap, and both players began the play on their lines of scrimmage and in the free-blocking zone. www.nfhs.org Rule Change BLOCKING BELOW THE WAIST RULES 2-17-1, 2-17-2, 2-17-4 It is legal for offensive linemen to block below the waist in the free-blocking zone, provided both players were on their lines of scrimmage and within the zone at the time of the snap and the block is an immediate, initial action following the snap. No. 77 could only block No. 62 below the waist if the block was immediate, initial action following the snap. -
Injury Incidence and Injury Patterns in Professional Football - the UEFA Injury Study
Linköping University Post Print Injury incidence and injury patterns in professional football - the UEFA injury study Jan Ekstrand, Martin Hägglund and Markus Waldén N.B.: When citing this work, cite the original article. Original Publication: Jan Ekstrand, Martin Hägglund and Markus Waldén, Injury incidence and injury patterns in professional football - the UEFA injury study, 2009, British journal of sports medicine, 060582. http://dx.doi.org/10.1136/bjsm.2009.060582 Copyright: BMJ Publishing http://group.bmj.com/ Postprint available at: Linköping University Electronic Press http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-52238 Injury incidence and injury patterns in professional football – the UEFA Injury Study Jan Ekstrand1, 2, Martin Hägglund1, Markus Waldén1 1 Department of Medical and Health Sciences, Linköping University, Linköping, Sweden 2 UEFA Medical Committee Corresponding author: Jan Ekstrand MD, PhD Solstigen 3 S-589 43, Linköping Sweden Tel.: + 46 13 161648, fax: +46 13 161892 [email protected] Key words: Football, injury incidence, epidemiology, soccer, professional Word count: 2,705 1 ABSTRACT Objective: To study the injury characteristics in professional football and to follow the variation of injury incidence during a match, during a season and over consecutive seasons. Design: Prospective cohort study where teams were followed for seven consecutive seasons. Team medical staff recorded individual player exposure and time-loss injuries from 2001 to 2008. Setting: European professional men’s football. Participants: The first team squads of 23 teams selected by UEFA as belonging to the 50 best European teams. Main outcome measurement: Injury incidence. Results: 4,483 injuries occurred during 566,000 hours of exposure, giving an injury incidence of 8.0 injuries/1,000 hours. -
Match Injury Incidence During the Super Rugby Tournament Is High : a Prospective Cohort Study Over Five Seasons Involving 93 641 Player-Hours
Schwellnus, M.P. et al. (2018). Match injury incidence during the Super Rugby tournament is high : a prospective cohort study over five seasons involving 93 641 player-hours. British Journal of Sports Medicine, 2018: 1-8. http://dx.doi.org/10.1136/bjsports-2018-09915 Match injury incidence during the Super Rugby tournament is high: a prospective cohort study over five seasons involving 93 641 player- hours Martin P Schwellnus, Esme Jordaan, Charl Janse van Rensburg, Helen Bayne, Wayne Derman, Clint Readhead, Rob Collins, Alan Kourie, Jason Suter and Org Strauss Abstract: Objectives To determine the incidence and nature of injuries in the Super Rugby tournament over a 5- year period. Methods 482 male professional rugby union players from six South African teams participating in the Super Rugby tournament were studied (1020 player-seasons). Medical staff of participating teams (2012–2016 tournaments) recorded all time loss injuries (total injuries and match injuries) and exposure hours (93 641 total playing hours; 8032 match hours). Injury incidence, injured player proportion, severity (time lost), anatomical location, tissue type and activity/phase during which injury occurred are reported. Results The overall incidence of match injuries (per 1000 player-hours; 95% CI) for each year was as follows: 2012 (83.3; 69.4–99.2); 2013 (115.1; 98.7–133.5); 2014 (95.9; 80.8–113.1), 2015 (112.3; 96.6–129.9) and 2016 (93.2; 79.9–107.9). The injured player proportion for each year was as follows: 2012 (54.6%); 2013 (49.4%); 2014 (52.0%); 2015 (50.0%); and 2016 (39.8%). -
Summary of Penalties
SUMMARY OF PENALTIES LOSS OF A DOWN Sig Rule Reference Illegal scrimmage kick [also loss of five yards] ............................ 31* 6 3 10 Illegally handing ball forward [also loss of five yards] ................ 35* 7 1 6 Planned loose ball play [also loss of five yards] .......................... 19* 7 1 7 Intentionally throwing backward pass out of bounds [also loss of five yards] ........................................................... 35* 7 2 1 Illegal forward pass by Team A [also loss of five yards] ............ 35* 7 3 2 Intentionally grounding forward pass ............................................. 36* 7 3 2 Forward pass illegally touched by player out of bounds ............ 16* 7 3 4 Illegally batting ball [also loss of 10 yards] (see exceptions) .... 31* 9 4 1 Illegally kicking ball [also loss of 10 yards] (see exceptions) .... 31* 9 4 4 LOSS OF FIVE YARDS Alteration of playing surface for an advantage ............................. 27 1 2 9 Improper numbering ............................................................................ 23 1 4 2 Coin-toss infractions ........................................................................... 19 3 1 1 Delay after three timeouts expended ............................................... 21 3 4 2 Illegal delay of the game ..................................................................... 21 3 4 2 Advancing a dead ball ......................................................................... 21 3 4 2 Disconcerting offensive signals ...................................................... -
2021-2022 NCHSAA Team Sport Contest Limitations, Playoff, and Seeding Format
2021-2022 NCHSAA Team Sport Contest Limitations, Playoff, and Seeding Format Season Limitations Baseball 22 Games Basketball 22 Games Football 10 Games Lacrosse (M) 20 Games Lacrosse (W) 20 Games Soccer 22 Games Softball 22 Games Tennis 22 Matches Volleyball 22 Matches (Only 3 out of 5 matches count towards RPI) Wrestling No Change Sports listed above can have one (1) in-season tournament (3-game maximum), which would only count as (1) game/match (exception: wrestling) • In tournaments where a team could play in more than 3-games, any game played beyond the 3rd game would each count as an individual game on the schedule Brackets Baseball, Basketball, Football, Soccer, Softball, Volleyball • 64 Team Brackets Lacrosse • 40 Team Brackets Tennis • 32 Team Brackets Wrestling • 32 Team Brackets Automatic Qualification • Each conference will be allotted playoff berths based on the number of schools fielding a team in a particular sport o 1-5 Teams = 1 Berth (Conference Champion) o 6+ Teams = 2 Berths (Conference Champion + 2nd Place or Conference Tournament Champion) • The highest finishing team from a given classification in a split conference will automatically qualify, regardless of overall conference finish (minimum of 2 schools per classification) • Addition of RPI rating to Handbook for conference tie-breaking procedure as the final tiebreaker Wildcards The remaining non-automatic teams in each region (East/West) will fill the remaining berths based solely upon their RPI rating. Seeding • Conference champions will be seeded before any other qualifying teams by RPI rating • All other teams will be seeded after the conference champions by RPI rating of the school, regardless of conference finish • Each region (East/West) will be seeded independently of one another, utilizing the RPI rating of the school March 2021 NCHSAA Playoff Ranking Formula An RPI (Ratings Percentage Index) formula will be used for all team bracketed playoffs. -
Evidence from the NFL
Time-bundled Contracts and Effort Decisions: Evidence from the NFL Ivan Li December 14, 2020 Abstract We are interested in the effects that multiple levers have on effort incentives in a time-bundled contract. In particular, our setting provides multiple primary rewards for high performing individuals and an alternative reward for poorly performing individu- als. Standard assumptions about zero effort and eliminating deadlines are not feasible in our setting because of the competitive nature of sports. We estimate a single-agent dynamic structural model of hidden effort choice in the context of the National Football League (NFL). The model builds upon current dynamic models in providing an identi- fication technique for a hidden policy function using observed heterogeneity in a sports setting. We find evidence that confirms general intuition about tanking: less talented teams that have little chance of making the playoffs and more talented teams that are likely to make the playoffs tend to exert lower effort. Counterfactual results show that modifying the length of the contract, timing of rewards, and thresholds of the rewards have ambiguous effects on effort incentives. Removing the alternative reward improves effort, especially at lower states, but might be antithetical to the league's objective. Keywords: Time-bundled contracts, Effort incentives, deadline effects, effort distortion, dynamic decision making, unobserved actions 1 1 Introduction A hotly debated topic among executives and officials in the major US sports leagues has been the effect of the draft pick allocation mechanism on the effort exerted by teams. The amateur draft is the primary way that teams obtain new talent each season, generating fan and media interest especially in the NBA and NFL.