GPI: THE DETAILS
The Global Poker Index ("GPI") is a ranking of the live tournament poker players. Players are ranked based on their performance by cashing in qualifying tournaments occurring during MBP tournaments.
A 'cash position' is any position where the player receives a portion of the total prize for their performance in an event (all references to buy-in are inclusive of entry fees). Typically the top 10% to 20% of the participants in an event finish in a cash position.
Kindly note that the GPI calculates points universally using USD as the baseline currency, and applies the prevailing daily exchange rate to determine points scores resulting from events with buy-ins of alternative currencies.
Qualifying tournaments are events with 21 or more players and a buy-in of $1 USD (or other currency equivalent) or higher that are open to the public, and that are not specialty or selected audience events such as charity, seniors, doubles, satellite, women, team and employee events. Players are ranked according to their finishing scores in qualifying tournaments. The score for a given event is derived from a combination of their finishing place percentage and buy-in. ‘Finishing percentage’ refers to the percentage of the starting field a player bests in his or her finish. 'Buy-in' refers to the relative amount of the event buy-in to the baseline buy-in of $1,000 USD (events with a buy-in of under $1,000 are still compared relative to a baseline of $1,000).
FINISHING PERCENTAGE FACTOR
The GPI uniquely takes into account finishing place relative to total field size for an event. The GPI finishing score is expressed as the finishing position relative to field size of the tournament. The base finishing score is calculated as the percentage of the field that is bested by a given player. This means that the relative percentage change in base finishing score between any two places is different depending on number of entrants. The higher the number of entrants in an event, the smaller the percentage change between the base scores for, as an example, a first and second place finish. The lower the number of entrants for an event, the larger the percentage change in base score between a first and second place finish, or any other places in comparison to each other.
A field size cap is applied at roughly the 99th percentile of qualifying events to ensure that events with extremely large field sizes do not skew the overall GPI score. For any event with a field size larger than the field size cap, the field size cap is used to calculate the score rather than the actual field size number. Administration to determine the cap on field size is performed one time per year. The field size cap for MBP 2016 events is set at 2,700.
The next factor used in creating an individual event score is based on the buy-in for the event relative to the baseline buy-in for events, $1,000 USD, while still allowing events with buy-ins as low as $1 USD. This factor addresses the concept of relative difficulty for the event. Larger buy-in events presume that the difficulty of the field is greater because more elite players enter higher buy-in events.
The GPI takes into account the concept of diminishing returns on the buy-in to an event. The percentage increase in buy-in between a $1,500 and $2,000 event is much greater than the increase between a $19,000 and a $19,500 buy-in. The GPI seeks to capture this concept of diminishing returns by using a logarithmic function.
A buy-in cap is applied at roughly the 99th percentile of qualifying events to ensure extremely high buy-in events do not skew the overall GPI score. For any event with a buy-in larger than the buy-in cap, the buy-in cap is used to calculate the score rather than the actual buy-in amount. Administration to determine the cap on buy-ins is performed one time per year. The buy-in cap for 2016 is set at $20,000 USD.
INDIVIDUAL EVENT SCORE CALCULATION
To calculate an individual event score, the GPI program multiplies the Finishing Percentage Factor with the Buy-In Factor. The product of this calculation is the GPI score for the given player in the given event.
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