Chess South Africa Ratings Database

PLAYER PAGE

Personal

Du Preez, J (Janco)

Chess SA id

1160152343

FIDE id

Date of birth

2016-06-24 (U10)

Gender

Male

Region

Overberg (WOS)

Citizen

RSA

Titles

Chess SA registered

Yes

Last active game

2025-09-20

Personal details last changed

2025-05-10

Junior GPX Games

Junior GPX Points

1167.5

Item	Main	Standard	Rapid	Blitz
Rating	1313.7	1263.5	1356.3	1200
Raw rating	1313.7	1263.5	1356.3	1200
Weighted rating	1286.1	1251.5	1291.1	1200
Weighted performance	1293.3	1227.3	1269.4	0
Floor	829.9	795.2	856.3	700
K-factor	36	36	36	36
Min/Max rating change allowed	141	151.5	132.7	165.8
Highest rating	1329.9 2025-09-01	1328.2 2023-05-01	1356.3 2025-09-30	1200 2018-10-01
Highest raw rating	1329.9 2025-09-01	1295.2 2025-09-01	1356.3 2025-09-30	1200 2024-03-01
Highest weighted rating	1281.6 2025-09-30	1279.8 2024-05-01	1282.6 2025-09-30	1200 2018-10-01
Highest weighted performance	1314.2 2025-04-01	1328.2 2023-05-01	1299 2024-03-01	1200 2024-03-01

Prediction
Item	Main	Standard	Rapid	Blitz
Rating change	0	0	0	0
New rating	1313.7	1263.5	1356.3	1200
Analysis
Rating	1313.7	1263.5	1356.3	1200
Raw rating	1313.7	1263.5	1356.3	1200
Weighted rating	1286.1	1251.5	1291.1
Weighted performance	1293.3	1227.3	1269.4
K-factor	36	36	36	36
Floor	829.9	795.2	856.3	700
Max/Min rating change allowed	141	151.5	132.7	165.8
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	1313.7	1263.5	1356.3	1200
New weighted rating	1290.2	1253.5	1298.9	1200
New weighted performance	1285.6	1219.8	1261.5	0
Temp new rating	1313.7	1263.5	1356.3	1200
Temp new rating +/-	0	0	0	0
Final new rating +/-	0	0	0	0
New rating	1313.7	1263.5	1356.3	1200
New K-factor	36	36	36	36
New floor	829.9	795.2	856.3	700

Item	Main	Standard	Rapid
	0	0	0
	52	22	30
	31	21	10
	24	16	8
	0	0	0
	0	0	0
History	107	59	48

Games since
	Main 83	Standard 43		Rapid 40		Blitz 0
Gender	Male
Age group	U10
Region	Overberg (WOS)
Province	Western Cape (WC)
Main
	RSA		Province		Region
Overall	3132		1024		77
Male	2456		761		52
U10	260		78		13
U10 Male	207		54		10
Standard
	RSA		Province		Region
Overall	3521		1004		60
Male	2712		716		41
U10	303		87		11
U10 Male	239		61		9
Rapid
	RSA		Province		Region
Overall	738		380		37
Male	614		317		27
U10	49		24		6
U10 Male	40		18		5
Blitz
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
U10	-1		-1		-1
U10 Male	-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	52	29.5	56.73	57.2	1285.3	1342.6
Standard	22	11	50	0	1333	1333
Rapid	30	18.5	61.67	99.2	1250.4	1349.5
Blitz	0	0	0	0	0	0
History
	Games	Score	%	Dp	AvgOpp	Performance
Main	107	58	54.21	35.7	1252.4	1288.2
Standard	59	30	50.85	7.2	1272.1	1279.3
Rapid	48	28	58.33	70.8	1228.2	1299
Blitz	0	0	0	0	0	0

Date	Main	Standard	Rapid	Blitz
2025-11-01	1313.7	1263.5	1356.3	1200
2025-09-30	1313.7	1263.5	1356.3	1200
2025-09-01	1329.9	1295.2	1325.7	1200
2025-08-01	1324	1279.8	1325.7	1200
2025-07-01	1324	1279.8	1325.7	1200
2025-06-01	1324	1279.8	1325.7	1200
2025-05-01	1328.3	1278.5	1325.7	1200
2025-04-01	1328.3	1278.5	1325.7	1200
2025-03-01	1287.5	1227.7	1325.7	1200
2025-02-01	1244.1	1227.7	1233.2	1200
2025-01-01	1244.1	1227.7	1233.2	1200
2024-12-01	1244.1	1227.7	1233.2	1200
2024-11-01	1244.1	1227.7	1233.2	1200
2024-10-01	1244.1	1227.7	1233.2	1200
2024-09-01	1245.3	1228.1	1233.2	1200
2024-08-01	1245.3	1228.1	1233.2	1200
2024-07-01	1197.5	1164	1233.2	1200
2024-09-01	1197.5	1164	1233.2	1200
2024-05-01	1252.2	1236	1233.2	1200
2024-04-01	1252.2	1236	1233.2	1200
2024-03-01	1202.3	1220.9	1161.6	1200
2024-02-01	1202.3	1220.9	1161.6	1200
2024-01-01	1205	1220.9	1160	1200
2023-12-01	1205	1220.9	1160	1200

Comming soon.

Tournaments

History

No tournaments found.

#	Tournament	Start	End	Type	Host	Rounds	Games	Score	Cfr	Analysis

#	Tournament	Start	End	Type	Host	Rounds	Games	Score	Cfr	Analysis
1	Kingsway Chess Open 2025 (U10)	2025-09-20	2025-09-20	Rapid	Overberg (WOS)	6	6	4	Yes	Analysis
2	Western Cape Schools - Top Schools 2025 (U9)	2025-09-06	2025-09-07	Standard	Overberg (WOS)	6	6	1.5	Yes	Analysis
3	Overberg Top Schools 2025 (U7+U9)	2025-08-02	2025-08-02	Standard	Overberg (WOS)	5	5	3	Yes	Analysis
4	Western Cape Schools Individual Championship 2025 (U9 Boys)	2025-05-17	2025-05-18	Standard	Cape Winelands (WCW)	6	6	3	Yes	Analysis
5	Overberg Schools - PS Closed 2025 (U9 Boys)	2025-03-08	2025-03-08	Standard	Overberg (WOS)	5	5	3.5	Yes	Analysis
6	Overberg Schools - PS Trials (Region 1) 2025 (U9 Boys)	2025-02-22	2025-02-22	Rapid	Overberg (WOS)	6	6	3.5	Yes	Analysis
7	Laerskool Welgemoed Rapid 2025 (U10)	2025-02-15	2025-02-15	Rapid	Cape Town (WCT)	6	6	3	Yes	Analysis
8	Curro Hermanus Summer Open 2025 (U9)	2025-02-08	2025-02-08	Rapid	Overberg (WOS)	6	6	4	Yes	Analysis
9	Overberg Schools & Federation Open 2025 (U9)	2025-02-01	2025-02-01	Rapid	Overberg (WOS)	6	6	4	Yes	Analysis

Last 500 tournaments since 01 January 2018

#	Tournament	Start	End	Type	Host	Rounds	Games	Score	Cfr	Analysis
1	Kingsway Chess Open 2025 (U10)	2025-09-20	2025-09-20	Rapid	Overberg (WOS)	6	6	4	Yes	Analysis
2	Western Cape Schools - Top Schools 2025 (U9)	2025-09-06	2025-09-07	Standard	Overberg (WOS)	6	6	1.5	Yes	Analysis
3	Overberg Top Schools 2025 (U7+U9)	2025-08-02	2025-08-02	Standard	Overberg (WOS)	5	5	3	Yes	Analysis
4	Western Cape Schools Individual Championship 2025 (U9 Boys)	2025-05-17	2025-05-18	Standard	Cape Winelands (WCW)	6	6	3	Yes	Analysis
5	Overberg Schools - PS Closed 2025 (U9 Boys)	2025-03-08	2025-03-08	Standard	Overberg (WOS)	5	5	3.5	Yes	Analysis
6	Overberg Schools - PS Trials (Region 1) 2025 (U9 Boys)	2025-02-22	2025-02-22	Rapid	Overberg (WOS)	6	6	3.5	Yes	Analysis
7	Laerskool Welgemoed Rapid 2025 (U10)	2025-02-15	2025-02-15	Rapid	Cape Town (WCT)	6	6	3	Yes	Analysis
8	Curro Hermanus Summer Open 2025 (U9)	2025-02-08	2025-02-08	Rapid	Overberg (WOS)	6	6	4	Yes	Analysis
9	Overberg Schools & Federation Open 2025 (U9)	2025-02-01	2025-02-01	Rapid	Overberg (WOS)	6	6	4	Yes	Analysis
10	Western Cape Top Schools Championship 2024 (U9 Mixed)	2024-08-30	2024-09-01	Standard	Eden (WEG)	6	5	2	Yes	Analysis
11	Overberg Schools - Top Schools 2024 (U7+U9 Mixed)	2024-07-27	2024-07-27	Standard	Overberg (WOS)	5	5	4	Yes	Analysis
12	Western Cape PS Individuals Championship 2024 (U9 Boys)	2024-05-04	2024-05-05	Standard	West Coast (WCU)	6	6	1	Yes	Analysis
13	Overberg Schools - PS Closed 2024 (U9 Boys)	2024-03-16	2024-03-16	Standard	Overberg (WOS)	5	5	3	Yes	Analysis
14	Overberg Schools - PS Trials Region 3 2024 (U9 Boys)	2024-03-02	2024-03-02	Rapid	Overberg (WOS)	5	5	4	Yes	Analysis
15	Overberg Open Rapid 2024 (U7+U9)	2024-01-27	2024-01-27	Rapid	Overberg (WOS)	5	5	2.5	Yes	Analysis
16	Kingsway Open 2023 (U8)	2023-10-28	2023-10-28	Rapid	Overberg (WOS)	5	5	2.5	Yes	Analysis
17	Overberg Top Schools 2023 (U7+U9)	2023-08-05	2023-08-05	Standard	Overberg (WOS)	5	5	2	Yes	Analysis
18	Western Cape PS Individuals 2023 (U7 Boys)	2023-05-05	2023-05-06	Standard	Cape Town (WCT)	6	6	4	Yes	Analysis
19	Overberg School Chess Closed Tournament 2023 (U7 Boys+Girls)	2023-03-25	2023-03-25	Standard	Overberg (WOS)	5	5	3	Yes	Analysis
20	Overberg Primary School Trials (Region 2)	2023-02-24	2023-03-10	Rapid	Overberg (WOS)	6	3	0.5	Yes	Analysis

#	Games	Start				End
1	6	Tournament Overberg Open Rapid 2024				Tournament Overberg Schools - PS Trials Region 3 2024
		date 2024-01-27	rnd 3	type Rapid	result 1	date 2024-03-02	rnd 3	type Rapid	result 1
		Opponent Mackenzie, T (Tylo)				Opponent Grieb, N (Nathan)
2	6	Tournament Overberg School Chess Closed Tournament 2023				Tournament Western Cape PS Individuals 2023
		date 2023-03-25	rnd 5	type Standard	result 1	date 2023-05-06	rnd 5	type Standard	result 1
		Opponent Beyers, A (Adriaan)				Opponent Prins, K (Kai)
3	4	Tournament Overberg Schools - PS Closed 2025				Tournament Overberg Schools - PS Closed 2025
		date 2025-03-08	rnd 1	type Standard	result 1	date 2025-03-08	rnd 4	type Standard	result 1
		Opponent Jansen, E (Emile)				Opponent Faasen, C (Charles)

#	Games	Start				End
1	6	Tournament Overberg School Chess Closed Tournament 2023				Tournament Western Cape PS Individuals 2023
		date 2023-03-25	rnd 5	type Standard	result 1	date 2023-05-06	rnd 5	type Standard	result 1
		Opponent Beyers, A (Adriaan)				Opponent Prins, K (Kai)
2	4	Tournament Overberg Schools - PS Closed 2025				Tournament Overberg Schools - PS Closed 2025
		date 2025-03-08	rnd 1	type Standard	result 1	date 2025-03-08	rnd 4	type Standard	result 1
		Opponent Jansen, E (Emile)				Opponent Faasen, C (Charles)
3	3	Tournament Overberg Top Schools 2025				Tournament Western Cape Schools - Top Schools 2025
		date 2025-08-02	rnd 4	type Standard	result 1	date 2025-09-06	rnd 1	type Standard	result 1
		Opponent Mullins, L (Lucy-May)				Opponent Gagiano, A (Almar)

#	Games	Start				End
1	6	Tournament Overberg Open Rapid 2024				Tournament Overberg Schools - PS Trials Region 3 2024
		date 2024-01-27	rnd 3	type Rapid	result 1	date 2024-03-02	rnd 3	type Rapid	result 1
		Opponent Mackenzie, T (Tylo)				Opponent Grieb, N (Nathan)
2	4	Tournament Laerskool Welgemoed Rapid 2025				Tournament Overberg Schools - PS Trials (Region 1) 2025
		date 2025-02-15	rnd 6	type Rapid	result 1	date 2025-02-22	rnd 3	type Rapid	result 1
		Opponent Harrington, S (Sawyer)				Opponent De Bod, D (Daniel)
3	3	Tournament Curro Hermanus Summer Open 2025				Tournament Laerskool Welgemoed Rapid 2025
		date 2025-02-08	rnd 5	type Rapid	result 1	date 2025-02-15	rnd 1	type Rapid	result 1
		Opponent Grobbelaar, M (Marlo)				Opponent Kannemeyer, J (Jude)

No games found.

#	Games	Start				End

#	Games	Start				End
1	4	Tournament Overberg Open Rapid 2024				Tournament Overberg Schools - PS Trials Region 3 2024
		date 2024-01-27	rnd 5	type Rapid	result 1	date 2024-03-02	rnd 3	type Rapid	result 1
		Opponent Henning, I (Ivan)				Opponent Grieb, N (Nathan)
2	3	Tournament Overberg Top Schools 2025				Tournament Western Cape Schools - Top Schools 2025
		date 2025-08-02	rnd 4	type Standard	result 1	date 2025-09-06	rnd 1	type Standard	result 1
		Opponent Mullins, L (Lucy-May)				Opponent Gagiano, A (Almar)
3	3	Tournament Curro Hermanus Summer Open 2025				Tournament Laerskool Welgemoed Rapid 2025
		date 2025-02-08	rnd 5	type Rapid	result 1	date 2025-02-15	rnd 1	type Rapid	result 1
		Opponent Grobbelaar, M (Marlo)				Opponent Kannemeyer, J (Jude)

#	Games	Start				End
1	3	Tournament Overberg Top Schools 2025				Tournament Western Cape Schools - Top Schools 2025
		date 2025-08-02	rnd 4	type Standard	result 1	date 2025-09-06	rnd 1	type Standard	result 1
		Opponent Mullins, L (Lucy-May)				Opponent Gagiano, A (Almar)
2	2	Tournament Western Cape Schools Individual Championship 2025				Tournament Western Cape Schools Individual Championship 2025
		date 2025-05-17	rnd 4	type Standard	result 1	date 2025-05-18	rnd 5	type Standard	result 1
		Opponent Kuhn, D (Dian)				Opponent Coetzee, S (Sean)
3	2	Tournament Overberg Schools - PS Closed 2025				Tournament Overberg Schools - PS Closed 2025
		date 2025-03-08	rnd 3	type Standard	result 1	date 2025-03-08	rnd 4	type Standard	result 1
		Opponent Louw, S (Sarel Johannes)				Opponent Faasen, C (Charles)

#	Games	Start				End
1	4	Tournament Overberg Open Rapid 2024				Tournament Overberg Schools - PS Trials Region 3 2024
		date 2024-01-27	rnd 5	type Rapid	result 1	date 2024-03-02	rnd 3	type Rapid	result 1
		Opponent Henning, I (Ivan)				Opponent Grieb, N (Nathan)
2	3	Tournament Curro Hermanus Summer Open 2025				Tournament Laerskool Welgemoed Rapid 2025
		date 2025-02-08	rnd 5	type Rapid	result 1	date 2025-02-15	rnd 1	type Rapid	result 1
		Opponent Grobbelaar, M (Marlo)				Opponent Kannemeyer, J (Jude)
3	3	Tournament Overberg Schools & Federation Open 2025				Tournament Curro Hermanus Summer Open 2025
		date 2025-02-01	rnd 6	type Rapid	result 1	date 2025-02-08	rnd 2	type Rapid	result 1
		Opponent Barnard, H (Hendrik)				Opponent Van der Westhuizen, L (Leah)

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	Badenhorst ,R (Rouxan)	7	0	-425	3	0	-425	4	0	-425	0	0	0
1	Badenhorst ,R (Rouxan)	7	1441.6	1016.6	3	1352.4	1016.6	4	1435.7	1016.6	0	0	0
2	Crafford ,Q (Quade)	6	1	-283.3	5	0.5	-340	1	0.5	0	0	0	0
2	Crafford ,Q (Quade)	6	1428.2	1144.9	5	1406.5	1088.2	1	1237.4	1428.2	0	0	0
3	Grobbelaar ,M (Marlo)	5	3	85	1	0	-425	4	3	212.5	0	0	0
3	Grobbelaar ,M (Marlo)	5	1205.2	1290.2	1	1233.1	780.2	4	1207.2	1417.7	0	0	0
4	Faasen ,C (Charles)	4	1.5	-106.2	2	1	0	2	0.5	-212.5	0	0	0
4	Faasen ,C (Charles)	4	1243.1	1136.8	2	1225.7	1243.1	2	1234.1	1030.6	0	0	0
5	Rock ,A (Albert)	4	3.5	318.8	1	1	425	3	2.5	283.3	0	0	0
5	Rock ,A (Albert)	4	1165.2	1483.9	1	1200	1590.2	3	1159.7	1448.5	0	0	0
6	Van Der Westhuizen ,E (Erin)	2	1	0	2	1	0	0	0	0	0	0	0
6	Van Der Westhuizen ,E (Erin)	2	1259.2	1259.2	2	1256.8	1259.2	0	0	0	0	0	0
7	Rice ,J (Jake)	2	1	0	2	1	0	0	0	0	0	0	0
7	Rice ,J (Jake)	2	1202.4	1202.4	2	1216.6	1202.4	0	0	0	0	0	0
8	Huisamen ,H (Heinrich)	2	1	0	2	1	0	0	0	0	0	0	0
8	Huisamen ,H (Heinrich)	2	1206.8	1206.8	2	1208.8	1206.8	0	0	0	0	0	0
9	Du Plessis ,E (Eben)	2	2	425	1	1	425	1	1	425	0	0	0
9	Du Plessis ,E (Eben)	2	1145.3	1570.3	1	1164.4	1570.3	1	1140	1570.3	0	0	0
10	Van Rensburg ,A (Aubrielle)	2	2	425	1	1	425	1	1	425	0	0	0
10	Van Rensburg ,A (Aubrielle)	2	1178.6	1603.6	1	1200	1603.6	1	1240	1603.6	0	0	0

Norms

No norms achieved.

#	Norm	Tournament	Start	End	Rounds	Games	Score	Details

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PLAYER PAGE

Personal

Du Preez, J (Janco)

Ratings

Game statistics

Rankings

Historical performance

Last 24 raw ratings

Rating graph

Tournaments

Top 3 Streaks

Top 10 opponents most often played

Norms