Chess South Africa Ratings Database

PLAYER PAGE

Personal

De Koster, A (Arenda)

Chess SA id

200006628

FIDE id

Date of birth

2000-03-14 (Adult)

Gender

Female

Region

Sedibeng (GSV)

Citizen

RSA

Titles

Chess SA registered

Last active game

2018-12-20

Personal details last changed

1900-01-01

Junior GPX Games

Junior GPX Points

Item	Main	Standard	Rapid	Blitz
Rating	1231.6	1230.8	1265	1227
Raw rating	1231.6	1230.8	1265	1227
Weighted rating	1231.6	1230.8	1264.9	1227
Weighted performance	0	0	0	0
Floor	731.6	730.8	765	727
K-factor	36	36	36	36
Min/Max rating change allowed	158.5	158.7	151.1	159.6
Highest rating	1273.4 2018-12-01	1268.6 2018-12-01	1265 2024-02-01	1227 2024-02-01
Highest raw rating	1231.6 2024-02-01	1230.8 2024-02-01	1265 2024-02-01	1227 2024-02-01
Highest weighted rating	1231.6 2024-02-01	1230.8 2025-02-01	1263.5 2025-08-01	1226.8 2025-08-01
Highest weighted performance	1273.4 2018-12-01	1268.6 2018-12-01	1200 2024-02-01	1200 2024-02-01

Prediction
Item	Main	Standard	Rapid	Blitz
Rating change	0	0	0	0
New rating	1231.6	1230.8	1265	1227
Analysis
Rating	1231.6	1230.8	1265	1227
Raw rating	1231.6	1230.8	1265	1227
Weighted rating	1231.6	1230.8	1264.9
Weighted performance	0	0	0
K-factor	36	36	36	36
Floor	731.6	730.8	765	727
Max/Min rating change allowed	158.5	158.7	151.1	159.6
Games	0	0	0	0
Score	0	0	0	0
Expected score	0	0	0	0
Score-Expected	0	0	0	0
Temp raw +/-	0	0	0	0
Final raw +/-	0	0	0	0
New raw rating	1231.6	1230.8	1265	1227
New weighted rating	1231.6	1230.8	1265	1227
New weighted performance	0	0	0	0
Temp new rating	1231.6	1230.8	1265	1227
Temp new rating +/-	0	0	0	0
Final new rating +/-	0	0	0	0
New rating	1231.6	1230.8	1265	1227
New K-factor	36	36	36	36
New floor	731.6	730.8	765	727

Item	Main	Standard	Rapid	Blitz
	0	0	0	0
	0	0	0	0
	0	0	0	0
	0	0	0	0
	0	0	0	0
	0	0	0	0
History	574	556	7	11

Games since
	Main 0	Standard 0		Rapid 0		Blitz 0
Gender	Female
Age group	Adult
Region	Sedibeng (GSV)
Province	Gauteng (GT)
Main
	RSA		Province		Region
Overall	-1		-1		-1
Female	-1		-1		-1
Adult	-1		-1		-1
Adult Female	-1		-1		-1
Standard
	RSA		Province		Region
Overall	-1		-1		-1
Female	-1		-1		-1
Adult	-1		-1		-1
Adult Female	-1		-1		-1
Rapid
	RSA		Province		Region
Overall	-1		-1		-1
Female	-1		-1		-1
Adult	-1		-1		-1
Adult Female	-1		-1		-1
Blitz
	RSA		Province		Region
Overall	-1		-1		-1
Female	-1		-1		-1
Adult	-1		-1		-1
Adult Female	-1		-1		-1


	Games	Score	%	Dp	AvgOpp	Performance
Main	0	0	0	0	0	0
Standard	0	0	0	0	0	0
Rapid	0	0	0	0	0	0
Blitz	0	0	0	0	0	0

	Games	Score	%	Dp	AvgOpp	Performance
Main	0	0	0	0	0	0
Standard	0	0	0	0	0	0
Rapid	0	0	0	0	0	0
Blitz	0	0	0	0	0	0
History
	Games	Score	%	Dp	AvgOpp	Performance
Main	6	4	66.67	141.7	1123.5	1265.2
Standard	6	4	66.67	141.7	1123.5	1265.2
Rapid	0	0	0	0	0	0
Blitz	0	0	0	0	0	0

Date	Main	Standard	Rapid	Blitz
2025-11-01	1231.6	1230.8	1265	1227
2025-09-30	1231.6	1230.8	1265	1227
2025-09-01	1231.6	1230.8	1265	1227
2025-08-01	1231.6	1230.8	1265	1227
2025-07-01	1231.6	1230.8	1265	1227
2025-06-01	1231.6	1230.8	1265	1227
2025-05-01	1231.6	1230.8	1265	1227
2025-04-01	1231.6	1230.8	1265	1227
2025-03-01	1231.6	1230.8	1265	1227
2025-02-01	1231.6	1230.8	1265	1227
2025-01-01	1231.6	1230.8	1265	1227
2024-12-01	1231.6	1230.8	1265	1227
2024-11-01	1231.6	1230.8	1265	1227
2024-10-01	1231.6	1230.8	1265	1227
2024-09-01	1231.6	1230.8	1265	1227
2024-08-01	1231.6	1230.8	1265	1227
2024-07-01	1231.6	1230.8	1265	1227
2024-09-01	1231.6	1230.8	1265	1227
2024-05-01	1231.6	1230.8	1265	1227
2024-04-01	1231.6	1230.8	1265	1227
2024-03-01	1231.6	1230.8	1265	1227
2024-02-01	1231.6	1230.8	1265	1227
2024-01-01	1231.6	1230.8	1265	1227
2023-12-01	1231.6	1230.8	1220.4	1220.4

Comming soon.

Tournaments

History

No tournaments found.

#	Tournament	Start	End	Type	Host	Rounds	Games	Score	Cfr	Analysis

No tournaments found.

#	Tournament	Start	End	Type	Host	Rounds	Games	Score	Cfr	Analysis

Last 500 tournaments since 01 January 2018

#	Tournament	Start	End	Type	Host	Rounds	Games	Score	Cfr	Analysis
1	South African Junior Team Championships 2018 (U20B)	2018-12-16	2018-12-20	Standard	4 Knights (4K)	7	6	4	Yes	Analysis

#	Games	Start				End
1	2	Tournament South African Junior Team Championships 2018				Tournament South African Junior Team Championships 2018
		date 2018-12-16	rnd 1	type Standard	result 1	date 2018-12-17	rnd 3	type Standard	result 1
		Opponent Koen, A (Andrea)				Opponent Chang, N (Nelson)
2	1	Tournament South African Junior Team Championships 2018				Tournament South African Junior Team Championships 2018
		date 2018-12-20	rnd 7	type Standard	result 1	date 2018-12-20	rnd 7	type Standard	result 1
		Opponent Shaba, K (Keneuwe)				Opponent Shaba, K (Keneuwe)
3	1	Tournament South African Junior Team Championships 2018				Tournament South African Junior Team Championships 2018
		date 2018-12-18	rnd 5	type Standard	result 1	date 2018-12-18	rnd 5	type Standard	result 1
		Opponent Manyate, S (Sibongile)				Opponent Manyate, S (Sibongile)

#	Games	Start				End
1	2	Tournament South African Junior Team Championships 2018				Tournament South African Junior Team Championships 2018
		date 2018-12-16	rnd 1	type Standard	result 1	date 2018-12-17	rnd 3	type Standard	result 1
		Opponent Koen, A (Andrea)				Opponent Chang, N (Nelson)
2	1	Tournament South African Junior Team Championships 2018				Tournament South African Junior Team Championships 2018
		date 2018-12-20	rnd 7	type Standard	result 1	date 2018-12-20	rnd 7	type Standard	result 1
		Opponent Shaba, K (Keneuwe)				Opponent Shaba, K (Keneuwe)
3	1	Tournament South African Junior Team Championships 2018				Tournament South African Junior Team Championships 2018
		date 2018-12-18	rnd 5	type Standard	result 1	date 2018-12-18	rnd 5	type Standard	result 1
		Opponent Manyate, S (Sibongile)				Opponent Manyate, S (Sibongile)

No games found.

#	Games	Start				End

No games found.

#	Games	Start				End

#	Games	Start				End
1	2	Tournament South African Junior Team Championships 2018				Tournament South African Junior Team Championships 2018
		date 2018-12-16	rnd 1	type Standard	result 1	date 2018-12-17	rnd 3	type Standard	result 1
		Opponent Koen, A (Andrea)				Opponent Chang, N (Nelson)
2	1	Tournament South African Junior Team Championships 2018				Tournament South African Junior Team Championships 2018
		date 2018-12-20	rnd 7	type Standard	result 1	date 2018-12-20	rnd 7	type Standard	result 1
		Opponent Shaba, K (Keneuwe)				Opponent Shaba, K (Keneuwe)
3	1	Tournament South African Junior Team Championships 2018				Tournament South African Junior Team Championships 2018
		date 2018-12-18	rnd 5	type Standard	result 1	date 2018-12-18	rnd 5	type Standard	result 1
		Opponent Manyate, S (Sibongile)				Opponent Manyate, S (Sibongile)

#	Games	Start				End
1	2	Tournament South African Junior Team Championships 2018				Tournament South African Junior Team Championships 2018
		date 2018-12-16	rnd 1	type Standard	result 1	date 2018-12-17	rnd 3	type Standard	result 1
		Opponent Koen, A (Andrea)				Opponent Chang, N (Nelson)
2	1	Tournament South African Junior Team Championships 2018				Tournament South African Junior Team Championships 2018
		date 2018-12-20	rnd 7	type Standard	result 1	date 2018-12-20	rnd 7	type Standard	result 1
		Opponent Shaba, K (Keneuwe)				Opponent Shaba, K (Keneuwe)
3	1	Tournament South African Junior Team Championships 2018				Tournament South African Junior Team Championships 2018
		date 2018-12-18	rnd 5	type Standard	result 1	date 2018-12-18	rnd 5	type Standard	result 1
		Opponent Manyate, S (Sibongile)				Opponent Manyate, S (Sibongile)

No games found.

#	Games	Start				End

No games found.

#	Games	Start				End

Top 10 opponents most often played

#	Opponent	Main			Standard			Rapid			Blitz
		Gms	Score	Dp	Gms	Score	Dp	Gms	Score	Dp	Gms	Score	Dp
		Gms	Aor	Prat	Gms	Aor	Prat	Gms	Aor	Prat	Gms	Aor	Prat
1	Booysen ,WH (Willem-Hendrik)	1	0	-425	1	0	-425	0	0	0	0	0	0
1	Booysen ,WH (Willem-Hendrik)	1	1420.9	995.9	1	1425.4	995.9	0	0	0	0	0	0
2	Zondo ,LC (Linda Cyril)	1	0	-425	1	0	-425	0	0	0	0	0	0
2	Zondo ,LC (Linda Cyril)	1	1358.2	933.2	1	1361.9	933.2	0	0	0	0	0	0
3	Chang ,N (Nelson)	1	1	425	1	1	425	0	0	0	0	0	0
3	Chang ,N (Nelson)	1	1159.5	1584.5	1	1144.4	1584.5	0	0	0	0	0	0
4	Shaba ,K (Keneuwe)	1	1	425	1	1	425	0	0	0	0	0	0
4	Shaba ,K (Keneuwe)	1	889.4	1314.4	1	894.6	1314.4	0	0	0	0	0	0
5	Koen ,A (Andrea)	1	1	425	1	1	425	0	0	0	0	0	0
5	Koen ,A (Andrea)	1	956.6	1381.6	1	928.4	1381.6	0	0	0	0	0	0
6	Manyate ,S (Sibongile)	1	1	425	1	1	425	0	0	0	0	0	0
6	Manyate ,S (Sibongile)	1	956.6	1381.6	1	957.6	1381.6	0	0	0	0	0	0

Norms

No norms achieved.

#	Norm	Tournament	Start	End	Rounds	Games	Score	Details

Ratings

Tournaments

Grand Prix

Statistics

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PLAYER PAGE

Personal

De Koster, A (Arenda)

Ratings

Game statistics

Rankings

Historical performance

Last 24 raw ratings

Rating graph

Tournaments

Top 3 Streaks

Top 10 opponents most often played

Norms