Chess South Africa Ratings Database

PLAYER PAGE

Personal

Isaacs, J (Jonathan)

Chess SA id

1110159747

FIDE id

Date of birth

2011-05-08 (U16)

Gender

Male

Region

Eden (WEG)

Citizen

RSA

Titles

Chess SA registered

Last active game

2025-08-30

Personal details last changed

1900-01-01

Junior GPX Games

12.5

Junior GPX Points

1111.8

Item	Main	Standard	Rapid	Blitz
Rating	1210.7	1195.7	1229	1200
Raw rating	1210.7	1195.5	1228.1	1200
Weighted rating	1206.9	1195.7	1229	1200
Weighted performance	1103.3	0	0	0
Floor	740.3	729.7	738.2	700
K-factor	36	36	36	36
Min/Max rating change allowed	163.3	166.9	159.3	165.8
Highest rating	1240.3 2025-03-01	1229.7 2025-03-01	1350.3 2024-09-01	1200 2018-10-01
Highest raw rating	1240.3 2025-03-01	1229.7 2025-03-01	1238.2 2024-10-01	1200 2024-03-01
Highest weighted rating	1240.3 2018-10-01	1229.7 2018-10-01	1229 2025-09-30	1200 2018-10-01
Highest weighted performance	1205.6 2023-07-01	1200 2019-12-01	1350.3 2024-09-01	1200 2024-03-01

Prediction
Item	Main	Standard	Rapid	Blitz
Rating change	0	0.1	0.6	0
New rating	1210.7	1195.8	1229.6	1200
Analysis
Rating	1210.7	1195.7	1229	1200
Raw rating	1210.7	1195.5	1228.1	1200
Weighted rating	1206.9	1195.7	1229
Weighted performance	1103.3	0	0
K-factor	36	36	36	36
Floor	740.3	729.7	738.2	700
Max/Min rating change allowed	163.3	166.9	159.3	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	1210.7	1195.5	1228.1	1200
New weighted rating	1207.5	1195.8	1229.6	1200
New weighted performance	1102.9	0	0	0
Temp new rating	1210.7	1195.8	1229.6	1200
Temp new rating +/-	0	0.1	0.6	0
Final new rating +/-	0	0.1	0.6	0
New rating	1210.7	1195.8	1229.6	1200
New K-factor	36	36	36	36
New floor	740.3	729.7	738.2	700

Item	Main	Standard	Rapid
	0	0	0
	16	10	6
	6	0	6
	6	6	0
	0	0	0
	0	0	0
History	28	16	12

Games since
	Main 22	Standard 10		Rapid 12		Blitz 0
Gender	Male
Age group	U16
Region	Eden (WEG)
Province	Western Cape (WC)
Main
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
U16	-1		-1		-1
U16 Male	-1		-1		-1
Standard
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
U16	-1		-1		-1
U16 Male	-1		-1		-1
Rapid
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
U16	-1		-1		-1
U16 Male	-1		-1		-1
Blitz
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
U16	-1		-1		-1
U16 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	16	8	50	0	1217.1	1217.1
Standard	10	5	50	0	1207.9	1207.9
Rapid	6	3	50	0	1232.3	1232.3
Blitz	0	0	0	0	0	0
History
	Games	Score	%	Dp	AvgOpp	Performance
Main	28	15	53.57	30.4	1205.6	1236
Standard	16	8	50	0	1195.7	1195.7
Rapid	12	7	58.33	70.8	1218.8	1289.7
Blitz	0	0	0	0	0	0

Date	Main	Standard	Rapid	Blitz
2025-09-30	1210.7	1195.5	1228.1	1200
2025-09-01	1207.2	1195.5	1238.2	1200
2025-08-01	1207.2	1195.5	1238.2	1200
2025-07-01	1207.2	1195.4	1238.2	1200
2025-06-01	1207.2	1195.3	1238.2	1200
2025-05-01	1207.2	1195.2	1238.2	1200
2025-04-01	1207.2	1195	1238.2	1200
2025-03-01	1240.3	1229.7	1238.2	1200
2025-02-01	1210.8	1192.2	1238.2	1200
2025-01-01	1210.8	1191.8	1238.2	1200
2024-12-01	1210.8	1191.8	1238.2	1200
2024-11-01	1210.8	1191.8	1238.2	1200
2024-10-01	1210.8	1191.8	1238.2	1200
2024-09-01	1192.2	1191.8	1200	1200
2024-08-01	1192.2	1191.8	1200	1200
2024-07-01	1192.2	1191.8	1200	1200
2024-06-01	1192.2	1191.8	1200	1200
2024-08-01	1192.2	1191.8	1200	1200
2024-04-01	1192.2	1191.8	1200	1200
2024-03-01	1192.2	1191.8	1200	1200
2024-02-01	1192.2	1191.8	1200	1200
2024-01-01	1192.2	1191.8	1200	1200
2023-12-01	1192.2	1191.8	1200	1200
2023-11-01	1192.2	1191.8	1200	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	Tsogo Sun Moves For Life Learners Tournament 2025 (U13)	2025-08-30	2025-08-30	Rapid	Eden (WEG)	6	6	3	Yes	Analysis
2	Eden Chess Trials 2 2025 (U16)	2025-03-15	2025-04-12	Standard	Eden (WEG)	10	0	0	No	Analysis
3	Eden Schools Chess Trials 1 2025 (U15 Boys)	2025-03-08	2025-03-08	Standard	Eden (WEG)	5	5	1.5	Yes	Analysis
4	Mossel Bay Schools Trials 2 2025 (U15 Boys)	2025-02-22	2025-02-22	Standard	Eden (WEG)	5	5	3.5	Yes	Analysis

Last 500 tournaments since 01 January 2018

#	Tournament	Start	End	Type	Host	Rounds	Games	Score	Cfr	Analysis
1	Tsogo Sun Moves For Life Learners Tournament 2025 (U13)	2025-08-30	2025-08-30	Rapid	Eden (WEG)	6	6	3	Yes	Analysis
2	Eden Chess Trials 2 2025 (U16)	2025-03-15	2025-04-12	Standard	Eden (WEG)	10	0	0	No	Analysis
3	Eden Schools Chess Trials 1 2025 (U15 Boys)	2025-03-08	2025-03-08	Standard	Eden (WEG)	5	5	1.5	Yes	Analysis
4	Mossel Bay Schools Trials 2 2025 (U15 Boys)	2025-02-22	2025-02-22	Standard	Eden (WEG)	5	5	3.5	Yes	Analysis
5	Tsogo Sun Moves For Life Learners Tournament 2024 (U13)	2024-08-31	2024-08-31	Rapid	Eden (WEG)	6	6	4	Yes	Analysis
6	Eden Top Schools 2023 (U13 Mix)	2023-08-19	2023-08-19	Standard	Eden (WEG)	5	4	2	Yes	Analysis
7	Mossel Bay Top Schools 2023 (U13)	2023-07-29	2023-07-29	Standard	Eden (WEG)	5	2	1	Yes	Analysis

#	Games	Start				End
1	4	Tournament Tsogo Sun Moves For Life Learners Tournament 2024				Tournament Mossel Bay Schools Trials 2 2025
		date 2024-08-31	rnd 4	type Rapid	result 1	date 2025-02-22	rnd 1	type Standard	result 1
		Opponent James, R (Ruwayda)				Opponent Kannemeyer, D (Dealon)
2	3	Tournament Mossel Bay Schools Trials 2 2025				Tournament Mossel Bay Schools Trials 2 2025
		date 2025-02-22	rnd 3	type Standard	result 1	date 2025-02-22	rnd 5	type Standard	result 1
		Opponent Mccreedy, J (James)				Opponent Kiewietz, J (Jayden)
3	2	Tournament Eden Schools Chess Trials 1 2025				Tournament Eden Schools Chess Trials 1 2025
		date 2025-03-08	rnd 3	type Standard	result 0.5	date 2025-03-08	rnd 4	type Standard	result 1
		Opponent Walker, L (Luke)				Opponent Booysen, D (Daniell)

#	Games	Start				End
1	3	Tournament Mossel Bay Schools Trials 2 2025				Tournament Mossel Bay Schools Trials 2 2025
		date 2025-02-22	rnd 3	type Standard	result 1	date 2025-02-22	rnd 5	type Standard	result 1
		Opponent Mccreedy, J (James)				Opponent Kiewietz, J (Jayden)
2	2	Tournament Eden Schools Chess Trials 1 2025				Tournament Eden Schools Chess Trials 1 2025
		date 2025-03-08	rnd 3	type Standard	result 0.5	date 2025-03-08	rnd 4	type Standard	result 1
		Opponent Walker, L (Luke)				Opponent Booysen, D (Daniell)
3	2	Tournament Eden Top Schools 2023				Tournament Mossel Bay Schools Trials 2 2025
		date 2023-08-19	rnd 5	type Standard	result 1	date 2025-02-22	rnd 1	type Standard	result 1
		Opponent November, C (Clayton)				Opponent Kannemeyer, D (Dealon)

#	Games	Start				End
1	4	Tournament Tsogo Sun Moves For Life Learners Tournament 2024				Tournament Tsogo Sun Moves For Life Learners Tournament 2025
		date 2024-08-31	rnd 4	type Rapid	result 1	date 2025-08-30	rnd 1	type Rapid	result 1
		Opponent James, R (Ruwayda)				Opponent Harding, C (Chrisma)
2	1	Tournament Tsogo Sun Moves For Life Learners Tournament 2025				Tournament Tsogo Sun Moves For Life Learners Tournament 2025
		date 2025-08-30	rnd 5	type Rapid	result 1	date 2025-08-30	rnd 5	type Rapid	result 1
		Opponent Gumenge, U (Uyathandwa)				Opponent Gumenge, U (Uyathandwa)
3	1	Tournament Tsogo Sun Moves For Life Learners Tournament 2025				Tournament Tsogo Sun Moves For Life Learners Tournament 2025
		date 2025-08-30	rnd 3	type Rapid	result 1	date 2025-08-30	rnd 3	type Rapid	result 1
		Opponent James, R (Ruwayda)				Opponent James, R (Ruwayda)

No games found.

#	Games	Start				End

#	Games	Start				End
1	4	Tournament Tsogo Sun Moves For Life Learners Tournament 2024				Tournament Mossel Bay Schools Trials 2 2025
		date 2024-08-31	rnd 4	type Rapid	result 1	date 2025-02-22	rnd 1	type Standard	result 1
		Opponent James, R (Ruwayda)				Opponent Kannemeyer, D (Dealon)
2	2	Tournament Eden Top Schools 2023				Tournament Tsogo Sun Moves For Life Learners Tournament 2024
		date 2023-08-19	rnd 5	type Standard	result 1	date 2024-08-31	rnd 1	type Rapid	result 1
		Opponent November, C (Clayton)				Opponent May, B (Britney)
3	2	Tournament Mossel Bay Top Schools 2023				Tournament Eden Top Schools 2023
		date 2023-07-29	rnd 5	type Standard	result 1	date 2023-08-19	rnd 1	type Standard	result 1
		Opponent Kannemeyer, J (Juvoghan)				Opponent Koopman, G (Giovanni)

#	Games	Start				End
1	2	Tournament Eden Top Schools 2023				Tournament Mossel Bay Schools Trials 2 2025
		date 2023-08-19	rnd 5	type Standard	result 1	date 2025-02-22	rnd 1	type Standard	result 1
		Opponent November, C (Clayton)				Opponent Kannemeyer, D (Dealon)
2	2	Tournament Mossel Bay Top Schools 2023				Tournament Eden Top Schools 2023
		date 2023-07-29	rnd 5	type Standard	result 1	date 2023-08-19	rnd 1	type Standard	result 1
		Opponent Kannemeyer, J (Juvoghan)				Opponent Koopman, G (Giovanni)
3	1	Tournament Eden Schools Chess Trials 1 2025				Tournament Eden Schools Chess Trials 1 2025
		date 2025-03-08	rnd 4	type Standard	result 1	date 2025-03-08	rnd 4	type Standard	result 1
		Opponent Booysen, D (Daniell)				Opponent Booysen, D (Daniell)

#	Games	Start				End
1	4	Tournament Tsogo Sun Moves For Life Learners Tournament 2024				Tournament Tsogo Sun Moves For Life Learners Tournament 2025
		date 2024-08-31	rnd 4	type Rapid	result 1	date 2025-08-30	rnd 1	type Rapid	result 1
		Opponent James, R (Ruwayda)				Opponent Harding, C (Chrisma)
2	1	Tournament Tsogo Sun Moves For Life Learners Tournament 2025				Tournament Tsogo Sun Moves For Life Learners Tournament 2025
		date 2025-08-30	rnd 5	type Rapid	result 1	date 2025-08-30	rnd 5	type Rapid	result 1
		Opponent Gumenge, U (Uyathandwa)				Opponent Gumenge, U (Uyathandwa)
3	1	Tournament Tsogo Sun Moves For Life Learners Tournament 2025				Tournament Tsogo Sun Moves For Life Learners Tournament 2025
		date 2025-08-30	rnd 3	type Rapid	result 1	date 2025-08-30	rnd 3	type Rapid	result 1
		Opponent James, R (Ruwayda)				Opponent James, R (Ruwayda)

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	Kiewietz ,J (Jayden)	2	1	0	2	1	0	0	0	0	0	0	0
1	Kiewietz ,J (Jayden)	2	1171.9	1171.9	2	1169.8	1171.9	0	0	0	0	0	0
2	James ,R (Ruwayda)	2	2	425	0	0	0	2	2	425	0	0	0
2	James ,R (Ruwayda)	2	1192.2	1617.2	0	0	0	2	1189.8	1617.2	0	0	0
3	Claasen ,J (Junaid)	1	0	-425	1	0	-425	0	0	0	0	0	0
3	Claasen ,J (Junaid)	1	1194.6	769.6	1	1194.8	769.6	0	0	0	0	0	0
4	Groenewald ,C (Cameron)	1	0.5	0	1	0.5	0	0	0	0	0	0	0
4	Groenewald ,C (Cameron)	1	1215.9	1215.9	1	1216.7	1215.9	0	0	0	0	0	0
5	Petersen ,R (Raynique)	1	0	-425	1	0	-425	0	0	0	0	0	0
5	Petersen ,R (Raynique)	1	1308.8	883.8	1	1308.6	883.8	0	0	0	0	0	0
6	Phiri ,S (Success)	1	0	-425	1	0	-425	0	0	0	0	0	0
6	Phiri ,S (Success)	1	1057.8	632.8	1	1063.6	632.8	0	0	0	0	0	0
7	Van Den Heever ,A (Anita)	1	0	-425	1	0	-425	0	0	0	0	0	0
7	Van Den Heever ,A (Anita)	1	1235.6	810.6	1	1235.8	810.6	0	0	0	0	0	0
8	Koopman ,G (Giovanni)	1	1	425	1	1	425	0	0	0	0	0	0
8	Koopman ,G (Giovanni)	1	1200	1625	1	1200	1625	0	0	0	0	0	0
9	Mccreedy ,J (James)	1	1	425	1	1	425	0	0	0	0	0	0
9	Mccreedy ,J (James)	1	1160	1585	1	1147.1	1585	0	0	0	0	0	0
10	Zhuang ,Z (Zhenxuan)	1	0	-425	1	0	-425	0	0	0	0	0	0
10	Zhuang ,Z (Zhenxuan)	1	1357.5	932.5	1	1342.4	932.5	0	0	0	0	0	0

Norms

No norms achieved.

#	Norm	Tournament	Start	End	Rounds	Games	Score	Details

Ratings

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PLAYER PAGE

Personal

Isaacs, J (Jonathan)

Ratings

Game statistics

Rankings

Historical performance

Last 24 raw ratings

Rating graph

Tournaments

Top 3 Streaks

Top 10 opponents most often played

Norms