for
Steve Akselrod

USATT#: 23936

##### Introduction
This page explains how Steve Akselrod (USATT# 23936)'s rating went from 2055 to 2037 at the 20th Annual North American Team Championship Powered By JOOLA held on 24 Nov 2017 - 26 Nov 2017. These ratings are calculated by the ratings processor which goes through 4 passes over the match results data for a tournament. The following values are produced at the end of each of the 4 passes of the ratings processor for Steve Akselrod for this tournament.

Initial Rating Pass 1 Pass 2 Pass 3 Final Rating (Pass 4)
2055 2027 2055 2055 2037

You can click here to view a table of all the resultant values from each of the 4 passes (and the initial rating) of the ratings processor for all of the 936 players in this tournament. Sections below for further details on the initial rating and the 4 passes of the ratings processor.

Note: We use mathematical notation to express the exact operations carried out in each pass of the ratings processor below. Whenever you see a variable/symbol such as for example ${X}_{i}^{3}$, we are following the convention that the superscript part of the variable (in this case "3") indicates an index (such as in a series), and it should not be misconstrued to be an exponent (which is how it is used by default).

##### Initial Rating
The initial rating of a player for a tournament is the rating the player received at the end of the most recent tournament prior to the current tournament. If this is the first tournament the player has ever participated in (based on our records), then the player has no initial rating.

The initial rating for 20th Annual North American Team Championship Powered By JOOLA held on 24 Nov 2017 - 26 Nov 2017 for Steve Akselrod, and its source tournament are as follows:
Initial Rating From Tournament Start Day End Day
2055 2015 JOOLA North American Teams Championships n/a 29 Nov 2015

Click here to view the details of the initial ratings for all the players in this tournament.

##### Pass 1 Rating
In Pass 1, we only consider all the players that come into this tournament with an initial rating while ignoring all the unrated players. If a rated player has a match against an unrated player, then that match result is ignored from the pass 1 calculations as well. We apply the point exchange table shown below to all the matches participated in by the rated players:

Point Spread Expected Result Upset Result
0 - 12 8 8
13 - 37 7 10
38 - 62 6 13
63 - 87 5 16
88 - 112 4 20
113 - 137 3 25
138 - 162 2 30
163 - 187 2 35
188 - 212 1 40
213 - 237 1 45
238 and up 0 50

Suppose player A has an initial rating of 2000 and player B has an initial rating of 2064, and they played a match against each other. When computing the impact of this match on their rating, the "Point Spread" (as it is referred to in the table above) between these two players is the absolute value of the difference their initial ratings. When the player with the higher rating wins, presumably the better player won, which is the expected outcome of a match, and therefore the "Expected Result" column applies. If the player with the lower rating wins the match, then presumably this is not expected, and therfore it is deemed as an "Upset Result" and the value from that column in the table above is used. So, in our example of player A vs player B, if player B wins the watch, then the expected outcome happens, and 5 points are added to player B's rating and 5 points are deducted from player A's rating. Looking at Steve Akselrod's match results and applying the point exchange table, gives us the following result:

##### Steve Akselrod's Wins
Winner Loser
Point Spread Outcome Gain Player USATT # Rating Player USATT # Rating
31 EXPECTED 7 Steve Akselrod 23936 2055 Stephen Yatvitskiy 94739 2024

##### Steve Akselrod's Losses
Winner Loser
Point Spread Outcome Loss Player USATT # Rating Player USATT # Rating
0 -0 Kenneth Parmanand 221002 0 Steve Akselrod 23936 0
198 EXPECTED -1 Curtis Humphreys 35209 2253 Steve Akselrod 23936 2055
116 EXPECTED -3 Kunal Shah 34225 2171 Steve Akselrod 23936 2055
188 EXPECTED -1 Rohan Acharya 89394 2243 Steve Akselrod 23936 2055
117 EXPECTED -3 Adrian Castillo 201647 2172 Steve Akselrod 23936 2055
303 EXPECTED -0 Guillermo Munoz 1017 2358 Steve Akselrod 23936 2055
92 EXPECTED -4 Ravi Ganapathy 212689 2147 Steve Akselrod 23936 2055
303 EXPECTED -0 Tuan Anh Tran 52187 2358 Steve Akselrod 23936 2055
2 EXPECTED -8 Ronald Chen 90520 2057 Steve Akselrod 23936 2055