Chess South Africa Ratings Database

PLAYER PAGE

Personal

Thomson-Selibowitz, R (Ryder)

Chess SA id

1110134886

FIDE id

Date of birth

2011-04-14 (U16)

Gender

Male

Region

Johannesburg Metro (GJM)

Citizen

RSA

Titles

Chess SA registered

Yes

Last active game

2025-10-18

Personal details last changed

1900-01-01

Junior GPX Games

Junior GPX Points

1313.9

Item	Main	Standard	Rapid	Blitz
Rating	1448.4	1446.8	1273.1	1145.8
Raw rating	1413.2	1415.4	1273.1	1145.8
Weighted rating	1448.4	1446.8	1258.9	1145.7
Weighted performance	1344.2	1384.2	1158.4	0
Floor	977.8	980	773.1	700
K-factor	32	32	36	36
Min/Max rating change allowed	122.4	122	149.4	179.1
Highest rating	1477.8 2025-08-01	1480 2025-01-01	1273.1 2025-11-01	1200 2018-10-01
Highest raw rating	1477.8 2025-08-01	1480 2025-01-01	1273.1 2025-11-01	1200 2020-01-01
Highest weighted rating	1448.4 2025-11-01	1446.8 2025-11-01	1258.9 2025-11-01	1200 2018-10-01
Highest weighted performance	1448 2025-01-01	1466.8 2025-01-01	1262.4 2024-06-01	1200 2020-01-01

Prediction
Item	Main	Standard	Rapid	Blitz
Rating change	-1.6	-1	0	0
New rating	1446.7	1445.9	1273.1	1145.8
Analysis
Rating	1448.4	1446.8	1273.1	1145.8
Raw rating	1413.2	1415.4	1273.1	1145.8
Weighted rating	1448.4	1446.8	1258.9
Weighted performance	1344.2	1384.2	1158.4
K-factor	32	32	36	36
Floor	977.8	980	773.1	700
Max/Min rating change allowed	122.4	122	149.4	179.1
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	1413.2	1415.4	1273.1	1145.8
New weighted rating	1446.7	1445.9	1260.9	1145.7
New weighted performance	1336.2	1375.9	1150.9	0
Temp new rating	1446.7	1445.9	1273.1	1145.8
Temp new rating +/-	-1.6	-1	0	0
Final new rating +/-	-1.6	-1	0	0
New rating	1446.7	1445.9	1273.1	1145.8
New K-factor	32	32	36	36
New floor	977.8	980	773.1	700

Item	Main	Standard	Rapid	Blitz
	0	0	0	0
	36	31	5	0
	85	60	25	0
	63	34	20	9
	0	0	0	0
	4	0	4	0
History	188	125	54	9

Games since
	Main 128	Standard 91		Rapid 37		Blitz 0
Gender	Male
Age group	U16
Region	Johannesburg Metro (GJM)
Province	Gauteng (GT)
Main
	RSA		Province		Region
Overall	1696		587		195
Male	1417		472		160
U16	226		73		25
U16 Male	181		55		19
Standard
	RSA		Province		Region
Overall	1619		596		189
Male	1344		481		156
U16	222		74		24
U16 Male	179		55		18
Rapid
	RSA		Province		Region
Overall	1218		220		98
Male	980		173		86
U16	184		24		11
U16 Male	147		17		10
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	36	21	58.33	70.8	1333.9	1404.7
Standard	31	18	58.06	68.5	1344.5	1413
Rapid	5	3	60	85	1268.3	1353.3
Blitz	0	0	0	0	0	0
History
	Games	Score	%	Dp	AvgOpp	Performance
Main	188	108.5	57.71	65.6	1327.9	1393.5
Standard	125	77	61.6	98.6	1312.9	1411.5
Rapid	54	29	53.7	31.5	1355.3	1386.8
Blitz	9	2.5	27.78	-188.9	1371.2	1182.3

Date	Main	Standard	Rapid	Blitz
2025-11-01	1413.2	1415.4	1273.1	1145.8
2025-09-30	1445.9	1443.2	1263	1145.8
2025-09-01	1445.9	1443.2	1263	1145.8
2025-08-01	1477.8	1479.6	1263	1145.8
2025-07-01	1470.5	1472.1	1263	1145.8
2025-06-01	1470.5	1472.1	1263	1145.8
2025-05-01	1463.1	1464.3	1263	1145.8
2025-04-01	1463.1	1464.3	1263	1145.8
2025-03-01	1446.3	1443.5	1263	1145.8
2025-02-01	1477.6	1480	1263	1145.8
2025-01-01	1477.6	1480	1263	1145.6
2024-12-01	1448.1	1449	1263	1145.6
2024-11-01	1448.1	1449	1263	1145.6
2024-10-01	1443.1	1449	1239.2	1145.6
2024-09-01	1437.3	1443.6	1239.2	1145.6
2024-08-01	1419.3	1422.1	1239.2	1145.6
2024-07-01	1424.2	1412.8	1255.4	1145.6
2024-09-01	1422.9	1409.3	1255.4	1145.6
2024-05-01	1409.6	1383	1255.4	1145.6
2024-04-01	1423.7	1399.6	1255.4	1145.6
2024-03-01	1407.8	1362.3	1255.4	1145.6
2024-02-01	1371.2	1362.3	1174	1145.6
2024-01-01	1347.7	1328.1	1174	1145.6
2023-12-01	1347.7	1328.1	1174	1145.6

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	Pretoria Boys High Annual Closed Chess Championship 2025	2025-10-18	2025-10-18	Rapid	Tshwane (GTP)	5	5	3	Yes	Analysis
2	2025 Gauteng Top Schools Teams (U19)	2025-08-30	2025-08-30	Standard	Tshwane (GTP)	5	5	2.5	Yes	Analysis
3	2025 Tshwane South School District CLOSED League Championship (U19A)	2025-08-16	2025-08-16	Standard	Tshwane (GTP)	5	5	4	Yes	Analysis
4	JMC Closed 2025 (B)	2025-08-09	2025-08-10	Standard	Johannesburg Metro (GJM)	5	2	0	Yes	Analysis
5	South African Open 2025 (U16 Open)	2025-07-03	2025-07-05	Standard	Johannesburg Metro (GJM)	5	5	3	Yes	Analysis
6	CPH May 2025 (B)	2025-05-03	2025-05-03	Standard	Johannesburg Metro (GJM)	5	5	3.5	Yes	Analysis
7	AHS Open Chess Tournament 2025 (C)	2025-03-01	2025-03-01	Standard	Tshwane (GTP)	5	5	3.5	Yes	Analysis
8	JMC Kick Off 2025 (B)	2025-02-02	2025-02-02	Standard	Johannesburg Metro (GJM)	5	4	1.5	Yes	Analysis

Last 500 tournaments since 01 January 2018

#	Tournament	Start	End	Type	Host	Rounds	Games	Score	Cfr	Analysis
1	Pretoria Boys High Annual Closed Chess Championship 2025	2025-10-18	2025-10-18	Rapid	Tshwane (GTP)	5	5	3	Yes	Analysis
2	2025 Gauteng Top Schools Teams (U19)	2025-08-30	2025-08-30	Standard	Tshwane (GTP)	5	5	2.5	Yes	Analysis
3	2025 Tshwane South School District CLOSED League Championship (U19A)	2025-08-16	2025-08-16	Standard	Tshwane (GTP)	5	5	4	Yes	Analysis
4	JMC Closed 2025 (B)	2025-08-09	2025-08-10	Standard	Johannesburg Metro (GJM)	5	2	0	Yes	Analysis
5	South African Open 2025 (U16 Open)	2025-07-03	2025-07-05	Standard	Johannesburg Metro (GJM)	5	5	3	Yes	Analysis
6	CPH May 2025 (B)	2025-05-03	2025-05-03	Standard	Johannesburg Metro (GJM)	5	5	3.5	Yes	Analysis
7	AHS Open Chess Tournament 2025 (C)	2025-03-01	2025-03-01	Standard	Tshwane (GTP)	5	5	3.5	Yes	Analysis
8	JMC Kick Off 2025 (B)	2025-02-02	2025-02-02	Standard	Johannesburg Metro (GJM)	5	4	1.5	Yes	Analysis
9	Gauteng Inter-Region at UJ 2024 (U14 Open)	2024-12-07	2024-12-08	Standard	Johannesburg Metro (GJM)	5	5	4	Yes	Analysis
10	Mzansi Summer Rapid 2024 (B)	2024-10-26	2024-10-26	Rapid	Johannesburg Metro (GJM)	6	6	4	Yes	Analysis
11	Mzansi Spring Open 2024 (Intermediate)	2024-09-07	2024-09-07	Standard	Johannesburg Metro (GJM)	5	5	3.5	Yes	Analysis
12	JMC Closed 2024 (C)	2024-08-09	2024-08-11	Standard	Johannesburg Metro (GJM)	5	5	3.5	Yes	Analysis
13	JNW Rapid - Helpmekaar Kollege 2024	2024-07-28	2024-07-28	Rapid	Johannesburg Metro (GJM)	7	7	3	Yes	Analysis
14	JMC Trinityhouse Randpark Ridge 2024 (C)	2024-07-13	2024-07-13	Standard	Johannesburg Metro (GJM)	5	5	3	Yes	Analysis
15	JMC NG Weltevreden Church 2024	2024-06-29	2024-06-29	Rapid	Johannesburg Metro (GJM)	7	7	4	Yes	Analysis
16	JMC Trinityhouse Little Falls 2024 (C)	2024-06-02	2024-06-02	Standard	Johannesburg Metro (GJM)	5	5	3	Yes	Analysis
17	JMC Crawford International Sandton 2024 (C)	2024-05-11	2024-05-11	Standard	Johannesburg Metro (GJM)	5	5	3.5	Yes	Analysis
18	JMC Helpmekaar Kollege Tournament 2024 (C)	2024-05-04	2024-05-04	Standard	Johannesburg Metro (GJM)	5	5	3	Yes	Analysis
19	First Knight Riders Junior Open 2024 (A+B)	2024-04-20	2024-04-20	Standard	Johannesburg Metro (GJM)	5	5	2	Yes	Analysis
20	JNW Open - Classic - Crawford 2024 (B)	2024-03-09	2024-03-09	Standard	Johannesburg Metro (GJM)	5	5	2	Yes	Analysis
21	JMC Unika School Tournament 2024 (D)	2024-03-02	2024-03-02	Standard	Johannesburg Metro (GJM)	5	5	5	Yes	Analysis
22	Gear Up Mzansi Rapid 2024 (Junior)	2024-02-17	2024-02-17	Rapid	Johannesburg Metro (GJM)	5	5	4.5	Yes	Analysis
23	2024 Gauteng Inter-Region Chess Championship (U14C)	2024-01-13	2024-01-14	Standard	Tshwane (GTP)	5	5	4	Yes	Analysis
24	JMC Kick Off Tournament 2024 (D)	2024-01-28	2024-01-28	Standard	Johannesburg Metro (GJM)	5	5	3	Yes	Analysis
25	Mzansi Summer Blitz 2023	2023-12-09	2023-12-09	Rapid	Johannesburg Metro (GJM)	7	7	3	Yes	Analysis
26	Mzansi Spring Rapid 2023	2023-09-02	2023-09-02	Rapid	Johannesburg Metro (GJM)	7	7	2.5	Yes	Analysis
27	JMC Closed Aug 2023 (U14)	2023-08-04	2023-08-06	Standard	Johannesburg Metro (GJM)	6	5	1	Yes	Analysis
28	Chess Power House 2023 (C)	2023-08-19	2023-08-19	Standard	Johannesburg Metro (GJM)	5	4	3	Yes	Analysis
29	JMC Trinity Little Falls 2023 (D)	2023-07-02	2023-07-02	Standard	Johannesburg Metro (GJM)	5	5	3.5	Yes	Analysis
30	JNW Open - Trinityhouse Little Falls 2023 (C)	2023-06-24	2023-06-24	Standard	Johannesburg Metro (GJM)	5	5	2.5	Yes	Analysis
31	Gauteng Open Arnold Classic 2023 (D)	2023-05-20	2023-05-20	Standard	Tshwane (GTP)	5	5	3.5	Yes	Analysis
32	Mzansi Open Blitz 2023	2023-04-29	2023-04-29	Blitz	Johannesburg Metro (GJM)	9	9	2.5	Yes	Analysis
33	JNW Open - Crawford 2023 (C)	2023-03-04	2023-03-04	Standard	Johannesburg Metro (GJM)	5	5	3	Yes	Analysis
34	JMC 1 St Peters 2023 (D)	2023-03-18	2023-03-18	Standard	Johannesburg Metro (GJM)	5	5	3	Yes	Analysis
35	Mzansi Rapid 2023 (Development)	2023-02-04	2023-02-04	Rapid	Johannesburg Metro (GJM)	6	6	5	Yes	Analysis
36	JMC Helpmekaar 2021 (U12)	2021-09-06	2021-09-06	Rapid	Johannesburg Metro (GJM)	5	4	0	Yes	Analysis

#	Games	Start				End
1	10	Tournament Gear Up Mzansi Rapid 2024				Tournament JMC Unika School Tournament 2024
		date 2024-02-17	rnd 1	type Rapid	result 1	date 2024-03-02	rnd 5	type Standard	result 1
		Opponent Makoto, R (Rj)				Opponent Moosa, I (Ikram)
2	8	Tournament Mzansi Summer Rapid 2024				Tournament Gauteng Inter-Region at UJ 2024
		date 2024-10-26	rnd 2	type Rapid	result 0.5	date 2024-12-07	rnd 3	type Standard	result 1
		Opponent Epule, D (Daniel)				Opponent Van Der Walt, H (Henrico)
3	7	Tournament JMC Closed 2024				Tournament Mzansi Spring Open 2024
		date 2024-08-10	rnd 4	type Standard	result 0.5	date 2024-09-07	rnd 5	type Standard	result 0.5
		Opponent Butler, K (Kayla)				Opponent Seitsang, O (Orebotse Clifford)

#	Games	Start				End
1	10	Tournament JMC Closed 2024				Tournament Gauteng Inter-Region at UJ 2024
		date 2024-08-10	rnd 4	type Standard	result 0.5	date 2024-12-07	rnd 3	type Standard	result 1
		Opponent Butler, K (Kayla)				Opponent Van Der Walt, H (Henrico)
2	7	Tournament JMC Crawford International Sandton 2024				Tournament JMC Trinityhouse Little Falls 2024
		date 2024-05-11	rnd 3	type Standard	result 1	date 2024-06-02	rnd 4	type Standard	result 0.5
		Opponent Chadalavada, B (Bhaarghavarama)				Opponent Ryan, D (Declan)
3	6	Tournament 2024 Gauteng Inter-Region Chess Championship				Tournament JMC Kick Off Tournament 2024
		date 2024-01-13	rnd 3	type Standard	result 1	date 2024-01-28	rnd 3	type Standard	result 1
		Opponent Venter, D (Dian)				Opponent Bijker, X (Xander)

#	Games	Start				End
1	7	Tournament Mzansi Summer Blitz 2023				Tournament JMC NG Weltevreden Church 2024
		date 2023-12-09	rnd 7	type Rapid	result 1	date 2024-06-29	rnd 1	type Rapid	result 1
		Opponent Chinoruma, T (Tawana)				Opponent Setshogwe, O (Oankaraba)
2	5	Tournament Mzansi Summer Rapid 2024				Tournament Mzansi Summer Rapid 2024
		date 2024-10-26	rnd 2	type Rapid	result 0.5	date 2024-10-26	rnd 6	type Rapid	result 0.5
		Opponent Epule, D (Daniel)				Opponent Bloem, J (James)
3	4	Tournament JMC NG Weltevreden Church 2024				Tournament JNW Rapid - Helpmekaar Kollege 2024
		date 2024-06-29	rnd 5	type Rapid	result 0.5	date 2024-07-28	rnd 1	type Rapid	result 0.5
		Opponent Tierney, G (Grayson)				Opponent Roets, WC (Willem Cornelius)

#	Games	Start				End
1	2	Tournament Mzansi Open Blitz 2023				Tournament Mzansi Open Blitz 2023
		date 2023-04-29	rnd 7	type Blitz	result 0.5	date 2023-04-29	rnd 8	type Blitz	result 1
		Opponent Mandishona, G (Gibson)				Opponent Westoby, A (Adam)
2	1	Tournament Mzansi Open Blitz 2023				Tournament Mzansi Open Blitz 2023
		date 2023-04-29	rnd 5	type Blitz	result 1	date 2023-04-29	rnd 5	type Blitz	result 1
		Opponent Elangbam, K (Kernick)				Opponent Elangbam, K (Kernick)

#	Games	Start				End
1	6	Tournament Gear Up Mzansi Rapid 2024				Tournament JMC Unika School Tournament 2024
		date 2024-02-17	rnd 5	type Rapid	result 1	date 2024-03-02	rnd 5	type Standard	result 1
		Opponent Molaba, O (Odumetse)				Opponent Moosa, I (Ikram)
2	6	Tournament 2024 Gauteng Inter-Region Chess Championship				Tournament JMC Kick Off Tournament 2024
		date 2024-01-13	rnd 3	type Standard	result 1	date 2024-01-28	rnd 3	type Standard	result 1
		Opponent Venter, D (Dian)				Opponent Bijker, X (Xander)
3	5	Tournament JNW Open - Crawford 2023				Tournament JMC 1 St Peters 2023
		date 2023-03-04	rnd 3	type Standard	result 1	date 2023-03-18	rnd 2	type Standard	result 1
		Opponent Moller, L (Luan)				Opponent Pomone, L (Liam)

#	Games	Start				End
1	6	Tournament 2024 Gauteng Inter-Region Chess Championship				Tournament JMC Kick Off Tournament 2024
		date 2024-01-13	rnd 3	type Standard	result 1	date 2024-01-28	rnd 3	type Standard	result 1
		Opponent Venter, D (Dian)				Opponent Bijker, X (Xander)
2	5	Tournament JMC Unika School Tournament 2024				Tournament JMC Unika School Tournament 2024
		date 2024-03-02	rnd 1	type Standard	result 1	date 2024-03-02	rnd 5	type Standard	result 1
		Opponent Khumalo, M (Mandla)				Opponent Moosa, I (Ikram)
3	5	Tournament JNW Open - Crawford 2023				Tournament JMC 1 St Peters 2023
		date 2023-03-04	rnd 3	type Standard	result 1	date 2023-03-18	rnd 2	type Standard	result 1
		Opponent Moller, L (Luan)				Opponent Pomone, L (Liam)

#	Games	Start				End
1	4	Tournament Mzansi Summer Blitz 2023				Tournament Gear Up Mzansi Rapid 2024
		date 2023-12-09	rnd 7	type Rapid	result 1	date 2024-02-17	rnd 3	type Rapid	result 1
		Opponent Chinoruma, T (Tawana)				Opponent Upadhyay, S (Savya)
2	3	Tournament Mzansi Summer Rapid 2024				Tournament Mzansi Summer Rapid 2024
		date 2024-10-26	rnd 3	type Rapid	result 1	date 2024-10-26	rnd 5	type Rapid	result 1
		Opponent Daley, S (Sebastian)				Opponent Mlilo, S (Sibongisiwe)
3	3	Tournament Mzansi Rapid 2023				Tournament Mzansi Rapid 2023
		date 2023-02-04	rnd 1	type Rapid	result 1	date 2023-02-04	rnd 3	type Rapid	result 1
		Opponent Albetti, A (Adriano)				Opponent Shi, P (Peiqi)

#	Games	Start				End
1	1	Tournament Mzansi Open Blitz 2023				Tournament Mzansi Open Blitz 2023
		date 2023-04-29	rnd 8	type Blitz	result 1	date 2023-04-29	rnd 8	type Blitz	result 1
		Opponent Westoby, A (Adam)				Opponent Westoby, A (Adam)
2	1	Tournament Mzansi Open Blitz 2023				Tournament Mzansi Open Blitz 2023
		date 2023-04-29	rnd 5	type Blitz	result 1	date 2023-04-29	rnd 5	type Blitz	result 1
		Opponent Elangbam, K (Kernick)				Opponent Elangbam, K (Kernick)

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	Ngwangwa ,N (Nonhlanhla)	3	3	425	3	3	425	0	0	0	0	0	0
1	Ngwangwa ,N (Nonhlanhla)	3	1369.9	1794.9	3	1395.9	1794.9	0	0	0	0	0	0
2	Thakur ,Y (Yuv)	3	2	141.7	2	1.5	212.5	1	0.5	0	0	0	0
2	Thakur ,Y (Yuv)	3	1413.9	1555.5	2	1366.2	1626.4	1	1200	1413.9	0	0	0
3	Arokiam ,E (Ethan)	3	2	141.7	2	1	0	1	1	425	0	0	0
3	Arokiam ,E (Ethan)	3	1315.7	1457.4	2	1350.1	1315.7	1	1200	1740.7	0	0	0
4	Williams ,J (Joshua)	3	2	141.7	2	1.5	212.5	1	0.5	0	0	0	0
4	Williams ,J (Joshua)	3	1366.3	1508	2	1352.6	1578.8	1	1250	1366.3	0	0	0
5	Botha ,A (Andrea)	2	1	0	2	1	0	0	0	0	0	0	0
5	Botha ,A (Andrea)	2	1347.2	1347.2	2	1341.8	1347.2	0	0	0	0	0	0
6	Rademeyer ,F (Frederick Paul)	2	1	0	2	1	0	0	0	0	0	0	0
6	Rademeyer ,F (Frederick Paul)	2	1324.2	1324.2	2	1340.4	1324.2	0	0	0	0	0	0
7	Mkhasibe ,NZ (Nobuhle Zandile)	2	2	425	2	2	425	0	0	0	0	0	0
7	Mkhasibe ,NZ (Nobuhle Zandile)	2	1336.6	1761.6	2	1338.6	1761.6	0	0	0	0	0	0
8	Lekwape ,R (Retshidisitswe)	2	1	0	1	1	425	1	0	-425	0	0	0
8	Lekwape ,R (Retshidisitswe)	2	1310.7	1310.7	1	1296.1	1735.7	1	1200	885.7	0	0	0
9	Shi ,P (Peiqi)	2	2	425	1	1	425	1	1	425	0	0	0
9	Shi ,P (Peiqi)	2	1207.2	1632.2	1	1259.8	1632.2	1	1200	1632.2	0	0	0
10	Bloem ,J (James)	2	1	0	1	0.5	0	1	0.5	0	0	0	0
10	Bloem ,J (James)	2	1393.6	1393.6	1	1376	1393.6	1	1241.3	1393.6	0	0	0

Norms

No norms achieved.

#	Norm	Tournament	Start	End	Rounds	Games	Score	Details

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Thomson-Selibowitz, R (Ryder)

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Last 24 raw ratings

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Top 3 Streaks

Top 10 opponents most often played

Norms