Posts Tagged ‘London Chess League’

Prospects for a new team in Division 4 of the London Chess League

June 16, 2019

div4tab1

The table above shows results from the 2018/19 season of Division 4 of the London Chess League in terms of the final position of the various teams, the percentage of possible game points they achieved, the mean grade of the sides they fielded and the mean grade of the teams they faced.  We can see that the position followed the strength (mean grade) of the teams very closely and there was no significant difference in the strength of the opposition that different teams faced.

div4fig1

We can also consider the relationship between grading and percentage of possible game points achieved, as below.

div4fig2

On this basis, using the equation of the fitted trend line, we can estimate what average grading would be required to achieve various points percentages:

div4tab2

We do not believe that relegation operates from Division 4, but team members would hardly enjoy losing all the time, so we presume that a new team would wish to average at least 40% of game points, requiring an average grade of 113.  Or an average grade of 125 would be required for 50% performance.

We now consider the possible requirements for the specific boards, using the opposition faced by Team 9 (which scored 46%).

div4tab3

So we see that someone playing on Board 4 would meet opposition with a mean grade around 130 and should be of a strength to have a meaningful game with opposition graded between about 100 and about 150.  (Some figures in red italics are affected by the presence of defaults.)

Prospects for Lewisham 2 in Division 3 of the London Chess League

June 2, 2019
2ndteaminpub

Happy chess players celebrate promotion

Now that Lewisham Chess Club’s second team has secured promotion to Division 3 of the London Chess League, we can ask what lies in store next season.

The table below shows the ranking of the various teams in this year’s Division 3, together with the average (mean!) grade of the teams they put out and faced, based on information as at 1 June.

TABLE OF RANKINGS AGAINST MEAN GRADE AND MEAN GRADE OF OPPONENTS

div3fig1

The first thing to note is that there is no real difference between the strength of the opposition the various teams faced.  Intuitively enough, the teams with higher mean grades also tended to finish in higher positions, as is shown in the graph below.

GRAPH OF RANKING AGAINST MEAN GRADING

div3fig2

We see that you really need to put out teams with an average grading somewhat over 140 to ensure survival.

Next we ask what this means for the various different boards next season.  In Division 4, over 8 boards (as opposed to the ten in Div 3) Lewisham 2 averaged 149, so we take the team ranked 9 in Division 3 with an average grade of 147 as a proxy.

TABLE OF GRADINGS FACED BY PROXY TEAM

div3fig3

So we would say that someone playing Board 5 would face opponents with an average grade about 160 and should be of such a strength as to have a meaningful game with players graded between about 190 and about 140.