Chess South Africa Ratings Database

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Personal

Bosman, J (Johan)

Chess SA id

1120116463

FIDE id

Date of birth

2012-01-26 (U14)

Gender

Male

Region

Ekurhuleni (GE)

Citizen

RSA

Titles

Chess SA registered

Last active game

2025-08-16

Personal details last changed

1900-01-01

Junior GPX Games

28.5

Junior GPX Points

1109.6

Item	Main	Standard	Rapid	Blitz
Rating	1309	1269.1	1372.7	1200
Raw rating	1309	1269.1	1370.2	1200
Weighted rating	1293	1249.4	1372.7	1200
Weighted performance	1257.4	1088	1283.3	0
Floor	934.9	890.1	917	700
K-factor	32	36	32	36
Min/Max rating change allowed	142	150.3	130.1	165.8
Highest rating	1477.6 2022-05-01	1405.1 2022-05-01	1640 2022-05-01	1200 2018-10-01
Highest raw rating	1434.9 2022-06-01	1390.1 2022-06-01	1417 2025-06-01	1200 2024-02-01
Highest weighted rating	1434.9 2024-01-01	1390.1 2024-01-01	1371.5 2025-09-01	1200 2018-10-01
Highest weighted performance	1477.6 2022-05-01	1405.1 2022-05-01	1640 2022-05-01	1200 2024-02-01

Prediction
Item	Main	Standard	Rapid	Blitz
Rating change	0	0	1	0
New rating	1309	1269.1	1373.6	1200
Analysis
Rating	1309	1269.1	1372.7	1200
Raw rating	1309	1269.1	1370.2	1200
Weighted rating	1293	1249.4	1372.7
Weighted performance	1257.4	1088	1283.3
K-factor	32	36	32	36
Floor	934.9	890.1	917	700
Max/Min rating change allowed	142	150.3	130.1	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	1309	1269.1	1370.2	1200
New weighted rating	1293.5	1249.8	1373.6	1200
New weighted performance	1257	1087.6	1282.8	0
Temp new rating	1309	1269.1	1373.6	1200
Temp new rating +/-	0	0	1	0
Final new rating +/-	0	0	1	0
New rating	1309	1269.1	1373.6	1200
New K-factor	32	36	32	36
New floor	934.9	890.1	917	700

Item	Main	Standard	Rapid
	0	0	0
	27	10	17
	35	25	10
	14	14	0
	59	53	6
	10	10	0
History	155	122	33

Games since
	Main 62	Standard 35		Rapid 27		Blitz 0
Gender	Male
Age group	U14
Region	Ekurhuleni (GE)
Province	Gauteng (GT)
Main
	RSA		Province		Region
Overall	3100		1035		165
Male	2450		818		128
U14	574		180		31
U14 Male	423		135		23
Standard
	RSA		Province		Region
Overall	3343		1190		161
Male	2590		931		125
U14	640		217		30
U14 Male	461		161		22
Rapid
	RSA		Province		Region
Overall	636		111		35
Male	539		88		21
U14	125		16		8
U14 Male	100		11		5
Blitz
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
U14	-1		-1		-1
U14 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	27	18	66.67	141.7	1231.9	1373.5
Standard	10	6	60	85	1212.2	1297.2
Rapid	17	12	70.59	175	1243.4	1418.4
Blitz	0	0	0	0	0	0
History
	Games	Score	%	Dp	AvgOpp	Performance
Main	155	85	54.84	41.1	1236.7	1277.8
Standard	122	60	49.18	-7	1240.1	1233.1
Rapid	33	25	75.76	218.9	1224	1443
Blitz	0	0	0	0	0	0

Date	Main	Standard	Rapid	Blitz
2025-09-30	1309	1269.1	1370.2	1200
2025-09-01	1309	1269.1	1370.2	1200
2025-08-01	1321.5	1265.7	1417	1200
2025-07-01	1321.5	1265.7	1417	1200
2025-06-01	1321.5	1265.7	1417	1200
2025-05-01	1296.5	1265.7	1384.7	1200
2025-04-01	1294.2	1257.2	1384.7	1200
2025-03-01	1294.2	1257.2	1384.7	1200
2025-02-01	1289.4	1249.1	1384.7	1200
2025-01-01	1149.4	1103.1	1347	1200
2024-12-01	1261.2	1210.4	1347	1200
2024-11-01	1261.2	1210.4	1347	1200
2024-10-01	1261.2	1210.4	1347	1200
2024-09-01	1261.2	1210.4	1347	1200
2024-08-01	1261.2	1210.4	1347	1200
2024-07-01	1301.6	1259.4	1347	1200
2024-06-01	1326.8	1288.9	1347	1200
2024-08-01	1326.8	1288.9	1347	1200
2024-04-01	1326.8	1288.9	1347	1200
2024-03-01	1308.2	1288.9	1313.9	1200
2024-02-01	1311.7	1288.9	1320	1200
2024-01-01	1381.5	1371	1320	1200
2023-12-01	1381.5	1371	1320	1200
2023-11-01	1381.5	1371	1320	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	Ekurhuleni North Schools Teams 2025 (U13 Open)	2025-08-16	2025-08-16	Standard	Ekurhuleni (GE)	5	5	3	Yes	Analysis
2	Benoni Primary School Cluster Teams 2025 (U13A)	2025-08-02	2025-08-02	Rapid	Ekurhuleni (GE)	7	6	3	Yes	Analysis
3	RMS Rapid Chess Open 31 May 2025 (U13)	2025-05-31	2025-05-31	Rapid	Sedibeng (GSV)	6	6	5	Yes	Analysis
4	Benoni Primary School Cluster 12 April 2025 (U13 Open)	2025-04-12	2025-04-12	Standard	Ekurhuleni (GE)	5	5	3	Yes	Analysis
5	LS Northmead Trials 2025 (U13)	2025-01-25	2025-01-25	Rapid	Ekurhuleni (GE)	5	5	4	Yes	Analysis

Last 500 tournaments since 01 January 2018

#	Tournament	Start	End	Type	Host	Rounds	Games	Score	Cfr	Analysis
1	Ekurhuleni North Schools Teams 2025 (U13 Open)	2025-08-16	2025-08-16	Standard	Ekurhuleni (GE)	5	5	3	Yes	Analysis
2	Benoni Primary School Cluster Teams 2025 (U13A)	2025-08-02	2025-08-02	Rapid	Ekurhuleni (GE)	7	6	3	Yes	Analysis
3	RMS Rapid Chess Open 31 May 2025 (U13)	2025-05-31	2025-05-31	Rapid	Sedibeng (GSV)	6	6	5	Yes	Analysis
4	Benoni Primary School Cluster 12 April 2025 (U13 Open)	2025-04-12	2025-04-12	Standard	Ekurhuleni (GE)	5	5	3	Yes	Analysis
5	LS Northmead Trials 2025 (U13)	2025-01-25	2025-01-25	Rapid	Ekurhuleni (GE)	5	5	4	Yes	Analysis
6	Mzansi Interprovincial Youth Chess Championships 2024 (U14 Open A)	2024-12-16	2024-12-19	Standard	Capricorn (LCP)	7	6	0.5	Yes	Analysis
7	Gauteng Inter-Region at UJ 2024 (U14 Candidates)	2024-12-07	2024-12-08	Standard	Johannesburg Metro (GJM)	5	4	0.5	Yes	Analysis
8	Ekurhuleni Trails 2 2024 (U14)	2024-07-27	2024-07-27	Standard	Ekurhuleni (GE)	5	5	1.5	Yes	Analysis
9	Ekurhuleni North Primary Schools District Individual Finals 2024 (U13 Boys)	2024-05-11	2024-05-11	Standard	Ekurhuleni (GE)	5	5	2	Yes	Analysis
10	Benoni Primary School Cluster Individuals 2024 (U13 Boys)	2024-03-09	2024-03-09	Rapid	Ekurhuleni (GE)	5	5	4	Yes	Analysis
11	Laerskool Northmead Proewe 2024 (U13)	2024-02-10	2024-02-10	Rapid	Ekurhuleni (GE)	5	5	3	Yes	Analysis
12	2024 Gauteng Inter-Region Chess Championship (U12A)	2024-01-13	2024-01-14	Standard	Tshwane (GTP)	5	5	0	Yes	Analysis
13	2023 Ekurhuleni North District Schools Finals (U11)	2023-07-29	2023-07-29	Standard	Ekurhuleni (GE)	5	4	3	Yes	Analysis
14	Ekurhuleni Trials 2 2023 (U12)	2023-04-22	2023-04-22	Standard	Ekurhuleni (GE)	5	5	4	Yes	Analysis
15	Ekhuruleni Chess Trials 1 2023 (U12)	2023-03-25	2023-03-25	Standard	Ekurhuleni (GE)	5	5	4	Yes	Analysis
16	ACB Tournament 2022 (A)	2022-10-07	2022-10-08	Standard	Ekurhuleni (GE)	5	0	0	No	Analysis
17	ACB Tournament 2022 (B)	2022-10-08	2022-10-08	Standard	Ekurhuleni (GE)	5	5	2	Yes	Analysis
18	Ekurhuleni Chess Springs Club Open 2022 (D)	2022-09-03	2022-09-03	Standard	Ekurhuleni (GE)	5	5	2	Yes	Analysis
19	Ekurhuleni-North Schools Teams 2022 (U11)	2022-08-06	2022-08-06	Standard	Ekurhuleni (GE)	5	5	2	Yes	Analysis
20	2022 Gauteng Schools Individual Chess Championship (U11 Boys)	2022-06-18	2022-06-18	Standard	Ekurhuleni (GE)	5	5	3	Yes	Analysis
21	RMS Swiss For Rating of Players 2022 (U11)	2022-05-28	2022-05-28	Rapid	Ekurhuleni (GE)	7	6	6	Yes	Analysis
22	Ekurhuleni-North Schools Finals Indiv 2022 (U11 Boys)	2022-05-13	2022-05-13	Standard	Ekurhuleni (GE)	5	5	4	Yes	Analysis
23	Ekurhuleni Trials 1 2022 (U12)	2022-04-23	2022-04-23	Standard	Ekurhuleni (GE)	5	5	4	Yes	Analysis
24	South African Junior Closed Chess Championships 2022 (U10 Open)	2022-03-28	2022-04-02	Standard	Chess South Africa (CSA)	11	11	5	Yes	Analysis
25	2022 Gauteng Interregion (U10 Open)	2022-02-26	2022-02-26	Standard	Tshwane (GTP)	5	5	3.5	Yes	Analysis
26	Ekurhuleni Chess Open 2022 (D)	2022-01-08	2022-01-09	Standard	Ekurhuleni (GE)	7	7	3	Yes	Analysis
27	Ekurhuleni Trials (3)	2021-11-06	2021-11-06	Standard	Ekurhuleni (GE)	5	5	3	Yes	Analysis
28	Ekurhuleni Chess Chessa Open 2021 (C)	2021-03-27	2021-03-27	Standard	Ekurhuleni (GE)	5	5	1	Yes	Analysis
29	Alberton Chess Club Open 2020 (E)	2020-02-22	2020-02-22	Standard	Ekurhuleni (GE)	5	5	3	Yes	Analysis
30	2019 RMS Laerskole (U9)	2019-06-01	2019-06-01	Standard	Tshwane (GTP)	5	5	3	Yes	Analysis

#	Games	Start				End
1	9	Tournament Ekurhuleni-North Schools Finals Indiv 2022				Tournament 2022 Gauteng Schools Individual Chess Championship
		date 2022-05-13	rnd 5	type Standard	result 1	date 2022-06-18	rnd 2	type Standard	result 1
		Opponent Kleijnhans, J (Josua)				Opponent Buyeza, T (Tshenolo)
2	7	Tournament Benoni Primary School Cluster 12 April 2025				Tournament RMS Rapid Chess Open 31 May 2025
		date 2025-04-12	rnd 4	type Standard	result 1	date 2025-05-31	rnd 5	type Rapid	result 1
		Opponent Motsei, L (Lehakwe)				Opponent Joubert, C (Christopher)
3	7	Tournament Ekurhuleni Trials 1 2022				Tournament Ekurhuleni-North Schools Finals Indiv 2022
		date 2022-04-23	rnd 2	type Standard	result 1	date 2022-05-13	rnd 3	type Standard	result 1
		Opponent Hingorani, R (Ridhima)				Opponent Costelha, M (Miguel)

#	Games	Start				End
1	7	Tournament Ekurhuleni Trials 1 2022				Tournament Ekurhuleni-North Schools Finals Indiv 2022
		date 2022-04-23	rnd 2	type Standard	result 1	date 2022-05-13	rnd 3	type Standard	result 1
		Opponent Hingorani, R (Ridhima)				Opponent Costelha, M (Miguel)
2	4	Tournament Benoni Primary School Cluster 12 April 2025				Tournament Ekurhuleni North Schools Teams 2025
		date 2025-04-12	rnd 4	type Standard	result 1	date 2025-08-16	rnd 2	type Standard	result 1
		Opponent Motsei, L (Lehakwe)				Opponent Jacobs, I (Ian)
3	4	Tournament Ekurhuleni Trials 2 2023				Tournament 2023 Ekurhuleni North District Schools Finals
		date 2023-04-22	rnd 4	type Standard	result 1	date 2023-07-29	rnd 2	type Standard	result 1
		Opponent Chen, Y (Yuqi)				Opponent Sompa, M (Mangaliso)

#	Games	Start				End
1	7	Tournament LS Northmead Trials 2025				Tournament RMS Rapid Chess Open 31 May 2025
		date 2025-01-25	rnd 4	type Rapid	result 1	date 2025-05-31	rnd 5	type Rapid	result 1
		Opponent Lehanie, R (Ryan)				Opponent Joubert, C (Christopher)
2	7	Tournament RMS Swiss For Rating of Players 2022				Tournament Laerskool Northmead Proewe 2024
		date 2022-05-28	rnd 1	type Rapid	result 1	date 2024-02-10	rnd 1	type Rapid	result 1
		Opponent Kgare, M (Maraka)				Opponent Kleinhans, S (Siela)
3	4	Tournament Benoni Primary School Cluster Individuals 2024				Tournament Benoni Primary School Cluster Individuals 2024
		date 2024-03-09	rnd 1	type Rapid	result 1	date 2024-03-09	rnd 4	type Rapid	result 1
		Opponent Fagan, N (Nathan)				Opponent Plummer, M (Matthew)

No games found.

#	Games	Start				End

#	Games	Start				End
1	9	Tournament Ekurhuleni-North Schools Finals Indiv 2022				Tournament 2022 Gauteng Schools Individual Chess Championship
		date 2022-05-13	rnd 5	type Standard	result 1	date 2022-06-18	rnd 2	type Standard	result 1
		Opponent Kleijnhans, J (Josua)				Opponent Buyeza, T (Tshenolo)
2	7	Tournament Ekurhuleni Trials 1 2022				Tournament Ekurhuleni-North Schools Finals Indiv 2022
		date 2022-04-23	rnd 2	type Standard	result 1	date 2022-05-13	rnd 3	type Standard	result 1
		Opponent Hingorani, R (Ridhima)				Opponent Costelha, M (Miguel)
3	5	Tournament RMS Rapid Chess Open 31 May 2025				Tournament RMS Rapid Chess Open 31 May 2025
		date 2025-05-31	rnd 1	type Rapid	result 1	date 2025-05-31	rnd 5	type Rapid	result 1
		Opponent van der Berg, Z (Zane)				Opponent Joubert, C (Christopher)

#	Games	Start				End
1	7	Tournament Ekurhuleni Trials 1 2022				Tournament Ekurhuleni-North Schools Finals Indiv 2022
		date 2022-04-23	rnd 2	type Standard	result 1	date 2022-05-13	rnd 3	type Standard	result 1
		Opponent Hingorani, R (Ridhima)				Opponent Costelha, M (Miguel)
2	4	Tournament Ekurhuleni Trials 2 2023				Tournament 2023 Ekurhuleni North District Schools Finals
		date 2023-04-22	rnd 4	type Standard	result 1	date 2023-07-29	rnd 2	type Standard	result 1
		Opponent Chen, Y (Yuqi)				Opponent Sompa, M (Mangaliso)
3	3	Tournament Ekhuruleni Chess Trials 1 2023				Tournament Ekurhuleni Trials 2 2023
		date 2023-03-25	rnd 5	type Standard	result 1	date 2023-04-22	rnd 2	type Standard	result 1
		Opponent Tang, K (Kevin)				Opponent Hattingh, B (Ben)

#	Games	Start				End
1	7	Tournament LS Northmead Trials 2025				Tournament RMS Rapid Chess Open 31 May 2025
		date 2025-01-25	rnd 4	type Rapid	result 1	date 2025-05-31	rnd 5	type Rapid	result 1
		Opponent Lehanie, R (Ryan)				Opponent Joubert, C (Christopher)
2	7	Tournament RMS Swiss For Rating of Players 2022				Tournament Laerskool Northmead Proewe 2024
		date 2022-05-28	rnd 1	type Rapid	result 1	date 2024-02-10	rnd 1	type Rapid	result 1
		Opponent Kgare, M (Maraka)				Opponent Kleinhans, S (Siela)
3	4	Tournament Benoni Primary School Cluster Individuals 2024				Tournament Benoni Primary School Cluster Individuals 2024
		date 2024-03-09	rnd 1	type Rapid	result 1	date 2024-03-09	rnd 4	type Rapid	result 1
		Opponent Fagan, N (Nathan)				Opponent Plummer, M (Matthew)

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	Fick ,L (Logan Nicolas)	4	2.5	106.2	4	2.5	106.2	0	0	0	0	0	0
1	Fick ,L (Logan Nicolas)	4	1221.9	1328.1	4	1213.6	1328.1	0	0	0	0	0	0
2	Buitendag ,D (Darius)	3	0	-425	3	0	-425	0	0	0	0	0	0
2	Buitendag ,D (Darius)	3	1368.1	943.1	3	1367.5	943.1	0	0	0	0	0	0
3	Van Loggerenberg ,E (Elandre)	3	1	-141.7	2	1	0	1	0	-425	0	0	0
3	Van Loggerenberg ,E (Elandre)	3	1338.8	1197.1	2	1234.7	1338.8	1	1422.5	913.8	0	0	0
4	Pretorius ,W (Wihan)	3	2	141.7	0	0	0	3	2	141.7	0	0	0
4	Pretorius ,W (Wihan)	3	1190.4	1332.1	0	0	0	3	1253.3	1332.1	0	0	0
5	Myburgh ,L (Liam)	2	1	0	2	1	0	0	0	0	0	0	0
5	Myburgh ,L (Liam)	2	1284.2	1284.2	2	1292.1	1284.2	0	0	0	0	0	0
6	Billing ,A (Aidin)	2	0	-425	2	0	-425	0	0	0	0	0	0
6	Billing ,A (Aidin)	2	1277.3	852.3	2	1248.9	852.3	0	0	0	0	0	0
7	Minny ,O (Oban)	2	1	0	2	1	0	0	0	0	0	0	0
7	Minny ,O (Oban)	2	1342.8	1342.8	2	1326.2	1342.8	0	0	0	0	0	0
8	Tang ,K (Kevin)	2	1	0	2	1	0	0	0	0	0	0	0
8	Tang ,K (Kevin)	2	1260.1	1260.1	2	1247.6	1260.1	0	0	0	0	0	0
9	Kheswa ,S (Spholami)	2	1	0	2	1	0	0	0	0	0	0	0
9	Kheswa ,S (Spholami)	2	1316.4	1316.4	2	1316.6	1316.4	0	0	0	0	0	0
10	Retief ,A (Antonie)	2	1	0	2	1	0	0	0	0	0	0	0
10	Retief ,A (Antonie)	2	1376.9	1376.9	2	1377.3	1376.9	0	0	0	0	0	0

Norms

No norms achieved.

#	Norm	Tournament	Start	End	Rounds	Games	Score	Details

Ratings

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Personal

Bosman, J (Johan)

Ratings

Game statistics

Rankings

Historical performance

Last 24 raw ratings

Rating graph

Tournaments

Top 3 Streaks

Top 10 opponents most often played

Norms