Chess South Africa Ratings Database

PLAYER PAGE

Personal

Crookes, J (Jonas)

Chess SA id

105046624

FIDE id

Date of birth

2005-09-26 (Adult)

Gender

Male

Region

Overberg (WOS)

Citizen

RSA

Titles

Chess SA registered

Last active game

2023-09-03

Personal details last changed

1900-01-01

Junior GPX Games

Junior GPX Points

Item	Main	Standard	Rapid	Blitz
Rating	1464.2	1449.3	1339	1177.1
Raw rating	1464.2	1449.3	1339	1177.1
Weighted rating	1464.2	1449.3	1338.9	1177.1
Weighted performance	1050.9	1040.7	897.4	0
Floor	973.3	971.7	854	685.9
K-factor	32	32	36	40
Min/Max rating change allowed	113.8	116.2	136	171.3
Highest rating	1473.3 2021-11-01	1471.7 2021-09-01	1354 2023-03-01	1200 2020-01-01
Highest raw rating	1473.3 2021-11-01	1471.7 2021-09-01	1354 2023-03-01	1185.9 2020-01-01
Highest weighted rating	1473.3 2025-07-01	1471.7 2023-03-01	1354 2025-02-01	1185.9 2024-11-01
Highest weighted performance	1431.7 2023-09-01	1444.3 2021-08-01	1304.6 2023-04-01	1200 2020-01-01

Prediction
Item	Main	Standard	Rapid	Blitz
Rating change	0	0	0	0
New rating	1464.2	1449.3	1339	1177.1
Analysis
Rating	1464.2	1449.3	1339	1177.1
Raw rating	1464.2	1449.3	1339	1177.1
Weighted rating	1464.2	1449.3	1338.9
Weighted performance	1050.9	1040.7	897.4
K-factor	32	32	36	40
Floor	973.3	971.7	854	685.9
Max/Min rating change allowed	113.8	116.2	136	171.3
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	1464.2	1449.3	1339	1177.1
New weighted rating	1464.2	1449.3	1338.9	1177.1
New weighted performance	1050.4	1040.2	897	0
Temp new rating	1464.2	1449.3	1339	1177.1
Temp new rating +/-	0	0	0	0
Final new rating +/-	0	0	0	0
New rating	1464.2	1449.3	1339	1177.1
New K-factor	32	32	36	40
New floor	973.3	971.7	854	685.9

Item	Main	Standard	Rapid	Blitz
	0	0	0	0
	0	0	0	0
	0	0	0	0
	45	24	16	5
	19	11	8	0
	41	20	16	5
History	421	313	98	10

Games since
	Main 0	Standard 0		Rapid 0		Blitz 0
Gender	Male
Age group	Adult
Region	Overberg (WOS)
Province	Western Cape (WC)
Main
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
Adult	-1		-1		-1
Adult Male	-1		-1		-1
Standard
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
Adult	-1		-1		-1
Adult Male	-1		-1		-1
Rapid
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
Adult	-1		-1		-1
Adult Male	-1		-1		-1
Blitz
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
Adult	-1		-1		-1
Adult 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	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	215	142	66.05	136.4	1246.8	1383.2
Standard	160	104	65	127.5	1245	1372.5
Rapid	45	33.5	74.44	207.8	1214.8	1422.6
Blitz	10	4.5	45	-42.5	1419.8	1377.3

Date	Main	Standard	Rapid	Blitz
2025-09-30	1464.2	1449.3	1339	1177.1
2025-09-01	1464.2	1449.3	1339	1177.1
2025-08-01	1464.2	1449.3	1339	1177.1
2025-07-01	1464.2	1449.3	1339	1177.1
2025-06-01	1464.2	1449.3	1339	1177.1
2025-05-01	1464.2	1449.3	1339	1177.1
2025-04-01	1464.2	1449.3	1339	1177.1
2025-03-01	1464.2	1449.3	1339	1177.1
2025-02-01	1464.2	1449.3	1339	1177.1
2025-01-01	1464.2	1449.3	1338.9	1177.1
2024-12-01	1464.2	1449.3	1338.9	1177.1
2024-11-01	1464.2	1449.3	1338.9	1177.1
2024-10-01	1464.2	1449.3	1338.9	1177.1
2024-09-01	1464.2	1449.3	1338.9	1177.1
2024-08-01	1464.2	1449.3	1338.9	1177.1
2024-07-01	1464.2	1449.3	1338.9	1177.1
2024-06-01	1464.2	1449.3	1338.9	1177.1
2024-08-01	1464.2	1449.3	1338.9	1177.1
2024-04-01	1464.2	1449.3	1338.9	1177.1
2024-03-01	1464.2	1449.3	1338.9	1177.1
2024-02-01	1464.2	1449.3	1338.9	1177.1
2024-01-01	1464.2	1449.3	1338.9	1177.1
2023-12-01	1464.2	1449.3	1338.9	1177.1
2023-11-01	1464.2	1449.3	1338.9	1177.1

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	Western Cape Top Schools 2023 (U18 Mixed)	2023-09-02	2023-09-03	Standard	Cape Winelands (WCW)	6	5	3	Yes	Analysis
2	Overberg Top Schools 2023 (U15+U18)	2023-08-05	2023-08-05	Standard	Overberg (WOS)	5	5	4	Yes	Analysis
3	Western Cape HS Individuals 2023 (U19 Boys)	2023-04-01	2023-04-02	Standard	Cape Town (WCT)	6	5	3	Yes	Analysis
4	Hermanus Rapid 2023 (B)	2023-04-22	2023-04-22	Rapid	Overberg (WOS)	6	6	3.5	Yes	Analysis
5	Overberg High School Closed 2023 (U19 Boys)	2023-03-25	2023-03-25	Standard	Overberg (WOS)	5	5	4	Yes	Analysis
6	Western Cape Inter Regional 2023 (Junior Boys)	2023-03-18	2023-03-19	Standard	Eden (WEG)	5	4	0.5	Yes	Analysis
7	Western Cape Inter Regional 2023 (Blitz)	2023-03-17	2023-03-17	Blitz	Eden (WEG)	5	5	2.5	Yes	Analysis
8	Overberg High Schools Trails 2023 (U19)	2023-02-24	2023-02-24	Rapid	Overberg (WOS)	5	5	4	Yes	Analysis
9	Overberg Schools Open Tournament 2023 (U18)	2023-02-11	2023-02-11	Rapid	Overberg (WOS)	5	5	5	Yes	Analysis
10	OCF Youth Day Tournament 2022 (A)	2022-06-18	2022-06-18	Rapid	Overberg (WOS)	5	5	4	Yes	Analysis
11	Western Cape Schools Chess 2022 (U18 Boys)	2022-05-07	2022-05-08	Standard	Eden (WEG)	6	6	3.5	Yes	Analysis
12	OCF Open 2022 (U18)	2022-04-09	2022-04-09	Rapid	Overberg (WOS)	5	3	1	Yes	Analysis
13	Western Cape Inter Region Cup 2021 (Junior)	2022-03-04	2022-03-06	Standard	West Coast (WCU)	5	5	1	Yes	Analysis
14	Western Cape Schools 2021 (U18 Boys)	2021-10-23	2021-10-23	Rapid	Overberg (WOS)	5	5	3	Yes	Analysis
15	Overberg Schools Trials 2021 (U15+U18 Boys)	2021-09-18	2021-09-18	Rapid	Overberg (WOS)	5	5	4	Yes	Analysis
16	OCF Club Champs 2021 (Seniors)	2021-06-05	2021-08-14	Standard	Overberg (WOS)	10	10	9	Yes	Analysis
17	Coast to Coast 2021 (U18)	2021-08-28	2021-08-28	Rapid	West Coast (WCU)	6	6	4.5	Yes	Analysis
18	Coast to Coast 2021 (Blitz)	2021-08-27	2021-08-27	Blitz	West Coast (WCU)	5	5	2	Yes	Analysis
19	Gen Intercampus 2021 (U16)	2021-05-22	2021-05-22	Standard	Overberg (WOS)	5	5	5	Yes	Analysis
20	Kleinmond Open 2021 (U18+Open)	2021-04-17	2021-04-17	Standard	Overberg (WOS)	5	5	3	Yes	Analysis
21	Overberg Closed 2020 (U15 Boys)	2020-03-15	2020-03-15	Standard	Overberg (WOS)	5	5	4.5	Yes	Analysis
22	OCF Chess Tournament 2 2020 (Open)	2020-02-01	2020-02-01	Standard	Overberg (WOS)	5	5	4	Yes	Analysis
23	2019 Western Cape Club Championship (A+B)	2019-10-25	2019-10-27	Standard	Overberg (WOS)	6	6	1	Yes	Analysis
24	Spring Open 2019 (Open)	2019-09-14	2019-09-14	Standard	Overberg (WOS)	5	5	3	Yes	Analysis
25	The Manhattan Sweets & Super C National Chess Tournament 2019 (U15)	2019-09-06	2019-09-07	Standard	Cape Winelands (WCW)	5	4	1	Yes	Analysis
26	Curro Durbanville Chess Tournament 2019 (Elite)	2019-08-23	2019-08-24	Standard	Cape Town (WCT)	6	6	2	Yes	Analysis
27	2019 WP Youth Open (B)	2019-07-13	2019-07-13	Standard	Cape Town (WCT)	5	5	3.5	Yes	Analysis
28	SuperHero Open 2019 (Open)	2019-06-01	2019-06-01	Standard	Overberg (WOS)	5	5	3.5	Yes	Analysis
29	Overberg Club Champs 2019 (A)	2019-06-15	2019-06-15	Standard	Overberg (WOS)	5	5	2.5	Yes	Analysis
30	Western Cape Schools Individuals 2019 (U15 Boys)	2019-05-04	2019-05-05	Standard	Eden (WEG)	6	6	4	Yes	Analysis
31	Overberg School Chess Close Champs 2019 (U15 Boys)	2019-03-08	2019-03-09	Standard	Overberg (WOS)	6	6	6	Yes	Analysis
32	Overberg First Trial 2019 (Open)	2019-02-23	2019-02-23	Standard	Overberg (WOS)	5	5	3	Yes	Analysis
33	Caledon Casino 2 2018 (Open)	2018-10-20	2018-10-20	Standard	Overberg (WOS)	5	5	3	Yes	Analysis
34	Spring Open 2018 (Open)	2018-09-01	2018-09-01	Standard	Overberg (WOS)	5	5	2.5	Yes	Analysis
35	Caledon Open 2018 (Open)	2018-09-29	2018-09-29	Standard	Overberg (WOS)	5	5	3	Yes	Analysis
36	Caledon Casino Open 2018 (Open)	2018-08-04	2018-08-04	Standard	Overberg (WOS)	5	5	3	Yes	Analysis
37	Overberg 3rd Trial 2018 (U16)	2018-05-26	2018-05-26	Standard	Overberg (WOS)	5	5	4	Yes	Analysis
38	Overberg 2nd Trial 2018 (U16)	2018-05-05	2018-05-05	Standard	Overberg (WOS)	5	5	3.5	Yes	Analysis
39	Western Cape Schools Individuals 2018 (U13 Boys)	2018-05-19	2018-05-20	Standard	Overberg (WOS)	6	6	5	Yes	Analysis
40	Overberg Schools Closed 2018 (U13 Boys)	2018-03-23	2018-03-24	Standard	Overberg (WOS)	6	6	6	Yes	Analysis
41	Welgemoed Chess Challenge 2018 (U14)	2018-02-24	2018-02-24	Rapid	Cape Town (WCT)	5	5	4.5	Yes	Analysis

#	Games	Start				End
1	15	Tournament Welgemoed Chess Challenge 2018				Tournament Overberg 2nd Trial 2018
		date 2018-02-24	rnd 1	type Rapid	result 1	date 2018-05-05	rnd 4	type Standard	result 0.5
		Opponent Abrahamse, M (Meagan)				Opponent Lombaard, J (Jowayne)
2	14	Tournament Gen Intercampus 2021				Tournament OCF Club Champs 2021
		date 2021-05-22	rnd 1	type Standard	result 1	date 2021-08-14	rnd 9	type Standard	result 1
		Opponent Kuschke, I (Indra)				Opponent Joubert, A (Antonio)
3	13	Tournament OCF Youth Day Tournament 2022				Tournament Overberg High Schools Trails 2023
		date 2022-06-18	rnd 2	type Rapid	result 1	date 2023-02-24	rnd 4	type Rapid	result 1
		Opponent Arends, EJ (Earl)				Opponent Edwards, B (Brandon)

#	Games	Start				End
1	14	Tournament Gen Intercampus 2021				Tournament OCF Club Champs 2021
		date 2021-05-22	rnd 1	type Standard	result 1	date 2021-08-14	rnd 9	type Standard	result 1
		Opponent Kuschke, I (Indra)				Opponent Joubert, A (Antonio)
2	10	Tournament Overberg Schools Closed 2018				Tournament Overberg 2nd Trial 2018
		date 2018-03-23	rnd 1	type Standard	result 1	date 2018-05-05	rnd 4	type Standard	result 0.5
		Opponent De Wee, S (Stewan)				Opponent Lombaard, J (Jowayne)
3	7	Tournament OCF Chess Tournament 2 2020				Tournament Overberg Closed 2020
		date 2020-02-01	rnd 4	type Standard	result 1	date 2020-03-15	rnd 5	type Standard	result 1
		Opponent Booi, O (Ocean)				Opponent Jonas, SG (Sue-Win)

#	Games	Start				End
1	13	Tournament OCF Youth Day Tournament 2022				Tournament Overberg High Schools Trails 2023
		date 2022-06-18	rnd 2	type Rapid	result 1	date 2023-02-24	rnd 4	type Rapid	result 1
		Opponent Arends, EJ (Earl)				Opponent Edwards, B (Brandon)
2	7	Tournament Welgemoed Chess Challenge 2018				Tournament Coast to Coast 2021
		date 2018-02-24	rnd 1	type Rapid	result 1	date 2021-08-28	rnd 2	type Rapid	result 1
		Opponent Abrahamse, M (Meagan)				Opponent Pekeur, A (Amy)
3	5	Tournament Overberg Schools Trials 2021				Tournament Western Cape Schools 2021
		date 2021-09-18	rnd 2	type Rapid	result 1	date 2021-10-23	rnd 1	type Rapid	result 1
		Opponent Vosloo, X (Xander)				Opponent Segelaar, G (Geriant)

#	Games	Start				End
1	2	Tournament Western Cape Inter Regional 2023				Tournament Western Cape Inter Regional 2023
		date 2023-03-17	rnd 3	type Blitz	result 1	date 2023-03-17	rnd 4	type Blitz	result 0.5
		Opponent Conradie, M (Magda)				Opponent Parenzee, E (Ethan)
2	2	Tournament Coast to Coast 2021				Tournament Coast to Coast 2021
		date 2021-08-27	rnd 1	type Blitz	result 1	date 2021-08-27	rnd 2	type Blitz	result 1
		Opponent Adams, C (Chrystal)				Opponent Lewaks, S (Shaundre)
3	1	Tournament Western Cape Inter Regional 2023				Tournament Western Cape Inter Regional 2023
		date 2023-03-17	rnd 1	type Blitz	result 1	date 2023-03-17	rnd 1	type Blitz	result 1
		Opponent Karelse, E (Erin-Leigh)				Opponent Karelse, E (Erin-Leigh)

#	Games	Start				End
1	14	Tournament Gen Intercampus 2021				Tournament OCF Club Champs 2021
		date 2021-05-22	rnd 1	type Standard	result 1	date 2021-08-14	rnd 9	type Standard	result 1
		Opponent Kuschke, I (Indra)				Opponent Joubert, A (Antonio)
2	13	Tournament OCF Youth Day Tournament 2022				Tournament Overberg High Schools Trails 2023
		date 2022-06-18	rnd 2	type Rapid	result 1	date 2023-02-24	rnd 4	type Rapid	result 1
		Opponent Arends, EJ (Earl)				Opponent Edwards, B (Brandon)
3	9	Tournament Overberg Schools Closed 2018				Tournament Overberg 2nd Trial 2018
		date 2018-03-23	rnd 1	type Standard	result 1	date 2018-05-05	rnd 3	type Standard	result 1
		Opponent De Wee, S (Stewan)				Opponent Mehnert, E (Emile)

#	Games	Start				End
1	14	Tournament Gen Intercampus 2021				Tournament OCF Club Champs 2021
		date 2021-05-22	rnd 1	type Standard	result 1	date 2021-08-14	rnd 9	type Standard	result 1
		Opponent Kuschke, I (Indra)				Opponent Joubert, A (Antonio)
2	9	Tournament Overberg Schools Closed 2018				Tournament Overberg 2nd Trial 2018
		date 2018-03-23	rnd 1	type Standard	result 1	date 2018-05-05	rnd 3	type Standard	result 1
		Opponent De Wee, S (Stewan)				Opponent Mehnert, E (Emile)
3	7	Tournament Overberg School Chess Close Champs 2019				Tournament Western Cape Schools Individuals 2019
		date 2019-03-08	rnd 1	type Standard	result 1	date 2019-05-04	rnd 1	type Standard	result 1
		Opponent Simamkele, S (Sokhasie)				Opponent Billet, E (Ethan)

#	Games	Start				End
1	13	Tournament OCF Youth Day Tournament 2022				Tournament Overberg High Schools Trails 2023
		date 2022-06-18	rnd 2	type Rapid	result 1	date 2023-02-24	rnd 4	type Rapid	result 1
		Opponent Arends, EJ (Earl)				Opponent Edwards, B (Brandon)
2	5	Tournament Overberg Schools Trials 2021				Tournament Western Cape Schools 2021
		date 2021-09-18	rnd 2	type Rapid	result 1	date 2021-10-23	rnd 1	type Rapid	result 1
		Opponent Vosloo, X (Xander)				Opponent Segelaar, G (Geriant)
3	4	Tournament Welgemoed Chess Challenge 2018				Tournament Welgemoed Chess Challenge 2018
		date 2018-02-24	rnd 1	type Rapid	result 1	date 2018-02-24	rnd 4	type Rapid	result 1
		Opponent Abrahamse, M (Meagan)				Opponent Viljoen, R (Reinhard)

#	Games	Start				End
1	2	Tournament Coast to Coast 2021				Tournament Coast to Coast 2021
		date 2021-08-27	rnd 1	type Blitz	result 1	date 2021-08-27	rnd 2	type Blitz	result 1
		Opponent Adams, C (Chrystal)				Opponent Lewaks, S (Shaundre)
2	1	Tournament Western Cape Inter Regional 2023				Tournament Western Cape Inter Regional 2023
		date 2023-03-17	rnd 3	type Blitz	result 1	date 2023-03-17	rnd 3	type Blitz	result 1
		Opponent Conradie, M (Magda)				Opponent Conradie, M (Magda)
3	1	Tournament Western Cape Inter Regional 2023				Tournament Western Cape Inter Regional 2023
		date 2023-03-17	rnd 1	type Blitz	result 1	date 2023-03-17	rnd 1	type Blitz	result 1
		Opponent Karelse, E (Erin-Leigh)				Opponent Karelse, E (Erin-Leigh)

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	Mehnert ,E (Emile)	5	5	425	5	5	425	0	0	0	0	0	0
1	Mehnert ,E (Emile)	5	1113.1	1538.1	5	1128.4	1538.1	0	0	0	0	0	0
2	Edwards ,B (Brandon)	5	5	425	3	3	425	2	2	425	0	0	0
2	Edwards ,B (Brandon)	5	1149.3	1574.3	3	1095.8	1574.3	2	973.2	1574.3	0	0	0
3	Joubert ,A (Antonio)	4	4	425	4	4	425	0	0	0	0	0	0
3	Joubert ,A (Antonio)	4	1122.5	1547.5	4	1129.2	1547.5	0	0	0	0	0	0
4	Marais ,C (Cobus)	4	2.5	106.2	4	2.5	106.2	0	0	0	0	0	0
4	Marais ,C (Cobus)	4	1085.6	1191.9	4	1104.1	1191.9	0	0	0	0	0	0
5	Minnie ,T (Taylin)	4	4	425	4	4	425	0	0	0	0	0	0
5	Minnie ,T (Taylin)	4	1209.2	1634.2	4	1185.7	1634.2	0	0	0	0	0	0
6	Du Toit ,J (Jaywin)	4	2	0	3	2	141.7	1	0	-425	0	0	0
6	Du Toit ,J (Jaywin)	4	1249.4	1249.4	3	1228.3	1391.1	1	1142.4	824.4	0	0	0
7	Booi ,O (Ocean)	3	2.5	283.3	3	2.5	283.3	0	0	0	0	0	0
7	Booi ,O (Ocean)	3	1327.3	1610.6	3	1331.2	1610.6	0	0	0	0	0	0
8	Tyindi ,L (Luvuyo)	3	3	425	3	3	425	0	0	0	0	0	0
8	Tyindi ,L (Luvuyo)	3	1121.1	1546.1	3	1098.2	1546.1	0	0	0	0	0	0
9	Brander ,WWM (Waylon)	3	0	-425	3	0	-425	0	0	0	0	0	0
9	Brander ,WWM (Waylon)	3	1795.3	1370.3	3	1809.6	1370.3	0	0	0	0	0	0
10	Higham ,E (Ethan)	3	2.5	283.3	3	2.5	283.3	0	0	0	0	0	0
10	Higham ,E (Ethan)	3	1336.8	1620.1	3	1316.6	1620.1	0	0	0	0	0	0

Norms

No norms achieved.

#	Norm	Tournament	Start	End	Rounds	Games	Score	Details

Ratings

Tournaments

Grand Prix

Statistics

Notifications

PLAYER PAGE

Personal

Crookes, J (Jonas)

Ratings

Game statistics

Rankings

Historical performance

Last 24 raw ratings

Rating graph

Tournaments

Top 3 Streaks

Top 10 opponents most often played

Norms