Shenron's Snubs & PGRZ Methods

Introduction

Many people from different competitive scenes from Guilty Gear, Street Fighter, Smash Bros, Injustice, and more have been attracted to the new Bandai Namco game Dragonball FighterZ. Creating a ranking for a completely new scene was a daunting task because we have to create criteria from the ground up. Tackling an ordered list of 50 was something we thought impossible (we were hoping for 25 at most) until we realized we had enough data to create an accurate list down to 50.

Given that so many competitors have been drawn to this game, there are many notable individuals who nearly made the cut of Top 50 but fell only slightly short. We have provided a sampling of those names for you here, entitled Shenron’s Snubs.

 

Shenron’s Snubs

Why did they not make the cut? What does the cut mean? Let us explain to you how the #PGRZ was formed. A mathematical ranking that utilizes an algorithm, we do not simply award points based on placements. The PGStats team created an algorithm that produces a value based on 3 factors: wins, losses, and "outplacements", i.e. "who did you have a better/worse final placement than?". These wins are weighed depending on size of tournament they were at, and the recency of the tournament itself. This algorithm creates a value that is more accurate than what you can traditionally get in other systems. We call that the player’s “Power Level.”

Determining the #PGRZ Power Levels gets even more complicated though. The team had to create criteria that would accurately represent the scene and its players. Let’s delve into these a little more in-depth.


Qualifying Tournament

Excluding locals, all DBFZ tournaments around the world held between Feb 25, 2018 (Winter Brawl 12) and August 5, 2018 (Evo 2018) were considered for inclusion in the #PGRZ. A cut-off was set at 50 entrants; any non-local event which reached this threshold was factored into the algorithm (the full list is at the end of the article).

Despite being locals, the Summit of Power qualifiers were also included due to their status as tournaments with future ramifications. Summit of Power itself was also included and treated as a major, weighed similarly to Smash Summit events in Melee.

During this process, we created the first DBFZ “Tournament Tier System” (TTS), which we have previously developed for Smash Bros as well. By weighing tournaments based on attendance and (in the future) top player presence, the TTS indicates how important an event is for the greater scene. This is something we’ll discuss in more detail after the release of the full #PGRZ.

Of the 28 qualifying tournaments during the ranking period, the TTS classified:

  • 13 as “C Tier” (50-99 entrants)
  • 8 as “B Tier” (100-199)
  • 4 as “A Tier” (200-399, plus Summit of Power)
  • 2 as “S Tier” (400-799)
  • and Evo, which broke our scale at 2579 entrants

Why We Do Not Include Locals

The PGstats team decided unanimously that weekly and bi-weekly events are not going to be factored into the #PGRZ. There are two major reasons behind this:

The first is that we do not want to disrupt the local environment with the pressures associated with global rankings. If the TTS were to factor in locals, Top Players may choose to opt out of participating in order to avoid bad losses or they would quickly burn out as they strive for the gold each week with no breaks in between high stakes events.

The second is that we simply do not believe that the tone of local environments should be affected by global pressures. Moreover, with high stakes event occurring primarily in North America, Top Players that hang around and attend local events would skew the #PGRZ towards those regions. It is our goal to be as inclusive as possible while also maintaining a distinction of prestige across tournaments from around the world.

However, not all the events on our list were given weights in the same way. The team decided that tournaments prior to the May 8, 2018 patch were to be given partial weight, both because of recency and due to the significant balance changes that the patch brought which drastically changed the meta.


The PGR Algorithm

So how does the #PGRZ algorithm itself work? Well it mainly functions on an iterative calculation. It can be conceptually thought of as each player being worth a specific number of points for a win, with a fraction of those points also being received for out placing them, relative to the gap between the two. From there, an iterative calculation is ran that figures out what each player's point value is, such that the number of points they are worth is equal (proportional) to the amount of points they earned from beating/outplacing others. This ends up being their "strength" and their rating. This, in turn, determines their relative “Power Levels” which is the normalized score produced from the algorithm.


That said, by working together with many people within the scene we hope that the first #PGRZ serves the community as an accurate rating scale for them to hold high.

 

Included Tournaments


Date

Tournament (Pre-Patch)

Entrants

Date

Tournament (Post-Patch)

Entrants

2018-02-25

CenCal Standoff 2018*

97

2018-05-14

Canada Cup Master Series

62

2018-02-25

Winter Brawl 12*

316

2018-05-18

BAM 10

122

2018-03-18

Final Round 2018*

314

2018-05-20

Stunfest 2018

156

2018-03-31

Bum's Birthday Bash*

51

2018-05-20

TORYUKEN 7

53

2018-04-01

Anime Ascension 2018*

140

2018-05-26

DBFZ FightingDay

104

2018-04-01

NorCal Regionals 2018*

181

2018-05-27

Combo Breaker 2018

752

2018-04-08

Brussels Challenge Major Edition*

96

2018-06-03

DreamHack Austin 2018

244

2018-04-11

NLBC Super (SoP Qualifier)*°

50

2018-06-03

Smash'N'Splash 4

86

2018-04-11

WNF Offseason 1.10 (SoP Qualifier)*°

64

2018-06-10

Summit of Power°

16

2018-04-15

Michigan Masters 2018*

125

2018-06-24

Northwest Majors X

68

2018-04-22

Clutch '18*

50

2018-07-01

CEO 2018

663

2018-04-28

Super TSB 2018*

84

2018-07-08

Sonic Boom V

82

2018-05-06

KVO x TSB 2018*

186

2018-07-15

FVxSEAM2018

56

2018-05-06

Texas Showdown 2018*

157

2018-07-22

VSFighting 2018

127

2018-07-23

Defend the North 2018

129

2018-08-05

Evo 2018

2579



* = Tournaments before May 8 patch are devalued

° = Summit of Power and SoP Qualifiers are also included



Production team of the #PGRZ

suar - Director

PracticalTAS - Rankings Expert

Spike - Graphic Designer

Keith - Graphic Designer

Giant - Lead Systems Engineer

Popi - Content Writer

Mayday - Content Writer

SamuraiPanda - Consultant



Dates for release

In keeping with the announcement tweet,

August 27th for 50-41

August 28th for 40-31

August 29th for 30-21

August 30th for 20-11

August 31st for 10-1