Chess South Africa Ratings Database

PLAYER PAGE

Personal

Ohlson, C (Cecil)

Chess SA id

161066248

FIDE id

Date of birth

1961-08-27 (Adult)

Gender

Male

Region

Cape Town (WCT)

Citizen

RSA

Titles

Chess SA registered

Last active game

2025-09-27

Personal details last changed

1900-01-01

Junior GPX Games

Junior GPX Points

Item	Main	Standard	Rapid	Blitz
Rating	1650.2	1650.3	1635.8	1615.6
Raw rating	1637.9	1636.3	1635.8	1615.6
Weighted rating	1650.2	1650.3	1633.4	1615.6
Weighted performance	1505.9	1504.9	0	0
Floor	1191.1	1186.7	1168.2	1115.6
K-factor	28	28	28	28
Min/Max rating change allowed	88.9	89.1	89.1	91.7
Highest rating	1691.1 2021-09-01	1686.7 2021-06-01	1748.8 2019-06-01	1615.6 2019-04-01
Highest raw rating	1691.1 2021-09-01	1686.7 2021-06-01	1668.2 2024-02-01	1615.6 2024-02-01
Highest weighted rating	1691.1 2021-09-01	1686.7 2021-09-01	1668.2 2024-04-01	1615.6 2019-04-01
Highest weighted performance	1682.6 2018-07-01	1684 2018-07-01	1748.8 2019-06-01	1200 2024-02-01

Prediction
Item	Main	Standard	Rapid	Blitz
Rating change	0.2	-0.3	0	0
New rating	1650.4	1650	1635.8	1615.6
Analysis
Rating	1650.2	1650.3	1635.8	1615.6
Raw rating	1637.9	1636.3	1635.8	1615.6
Weighted rating	1650.2	1650.3	1633.4
Weighted performance	1505.9	1504.9	0
K-factor	28	28	28	28
Floor	1191.1	1186.7	1168.2	1115.6
Max/Min rating change allowed	88.9	89.1	89.1	91.7
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	1637.9	1636.3	1635.8	1615.6
New weighted rating	1650.4	1650	1633.3	1615.6
New weighted performance	1496.2	1495.2	0	0
Temp new rating	1650.4	1650	1635.8	1615.6
Temp new rating +/-	0.2	-0.3	0	0
Final new rating +/-	0.2	-0.3	0	0
New rating	1650.4	1650	1635.8	1615.6
New K-factor	28	28	28	28
New floor	1191.1	1186.7	1168.2	1115.6

Item	Main	Standard	Rapid	Blitz
	0	0	0	0
	20	20	0	0
	56	49	7	0
	29	29	0	0
	38	38	0	0
	23	23	0	0
History	506	452	33	21

Games since
	Main 76	Standard 69		Rapid 7		Blitz 0
Gender	Male
Age group	Adult
Region	Cape Town (WCT)
Province	Western Cape (WC)
Main
	RSA		Province		Region
Overall	446		135		94
Male	414		127		87
Adult	234		79		59
Adult Male	220		74		54
Standard
	RSA		Province		Region
Overall	432		123		88
Male	398		114		81
Adult	217		66		51
Adult Male	203		62		48
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	20	10	50	0	1678.8	1678.8
Standard	20	10	50	0	1678.8	1678.8
Rapid	0	0	0	0	0	0
Blitz	0	0	0	0	0	0
History
	Games	Score	%	Dp	AvgOpp	Performance
Main	264	120	45.45	-38.6	1664.6	1626
Standard	250	112	44.8	-44.2	1667.7	1623.5
Rapid	14	8	57.14	60.7	1608.4	1669.2
Blitz	0	0	0	0	0	0

Date	Main	Standard	Rapid	Blitz
2025-11-01	1637.9	1636.3	1635.8	1615.6
2025-09-30	1672.9	1669.6	1635.8	1615.6
2025-09-01	1672.9	1669.6	1635.8	1615.6
2025-08-01	1672.9	1669.6	1635.8	1615.6
2025-07-01	1672.9	1669.6	1635.8	1615.6
2025-06-01	1672.9	1669.6	1635.8	1615.6
2025-05-01	1672.9	1669.6	1635.8	1615.6
2025-04-01	1672.9	1669.6	1635.8	1615.6
2025-03-01	1672.9	1669.6	1635.8	1615.6
2025-02-01	1672.9	1669.6	1635.3	1615.6
2025-01-01	1617.1	1618.1	1622.6	1615.6
2024-12-01	1617.1	1618.1	1622.6	1615.6
2024-11-01	1617.1	1618.1	1622.6	1615.6
2024-10-01	1617.1	1618.1	1622.6	1615.6
2024-09-01	1608.1	1611.4	1622.6	1615.6
2024-08-01	1608.1	1611.4	1622.6	1615.6
2024-07-01	1608.1	1611.4	1622.6	1615.6
2024-09-01	1623.7	1640.8	1622.6	1615.6
2024-05-01	1623.7	1640.8	1622.6	1615.6
2024-04-01	1646.6	1661.5	1668.2	1615.6
2024-03-01	1621.3	1640.8	1668.2	1615.6
2024-02-01	1621.3	1640.8	1668.2	1615.6
2024-01-01	1589.9	1623.2	1668.2	1615.6
2023-12-01	1546.1	1541.1	1650.5	1615.6

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	Cape Town Chess Federation Club League 2025 (A)	2025-07-26	2025-09-27	Standard	Cape Town (WCT)	11	11	3.5	Yes	Analysis
2	Cape Town Chess Federation Club League 2025 (C)	2025-07-26	2025-09-27	Standard	Cape Town (WCT)	11	0	0	No	Analysis
3	Cape Town Masters Challenge 2025 (Advanced)	2025-01-06	2025-01-11	Standard	Cape Town (WCT)	9	9	6.5	Yes	Analysis

Last 500 tournaments since 01 January 2018

#	Tournament	Start	End	Type	Host	Rounds	Games	Score	Cfr	Analysis
1	Cape Town Chess Federation Club League 2025 (A)	2025-07-26	2025-09-27	Standard	Cape Town (WCT)	11	11	3.5	Yes	Analysis
2	Cape Town Chess Federation Club League 2025 (C)	2025-07-26	2025-09-27	Standard	Cape Town (WCT)	11	0	0	No	Analysis
3	Cape Town Masters Challenge 2025 (Advanced)	2025-01-06	2025-01-11	Standard	Cape Town (WCT)	9	9	6.5	Yes	Analysis
4	CT League 2024 (A)	2024-07-20	2024-09-07	Standard	Cape Town (WCT)	11	11	3.5	Yes	Analysis
5	Cape Town Chess Federation Closed Chess Championships 2024 (B)	2024-06-14	2024-06-17	Standard	Cape Town (WCT)	7	7	5	Yes	Analysis
6	2024 Cape Town Chess Inter Club (Championship)	2024-03-19	2024-05-14	Standard	Cape Town (WCT)	7	7	0	Yes	Analysis
7	Hermanus Chess Club Open 2024 (Advanced)	2024-04-20	2024-04-20	Rapid	Overberg (WOS)	7	7	4	Yes	Analysis
8	South African Closed Chess Championship 2024 (Seniors)	2024-03-25	2024-04-02	Standard	Cape Town (WCT)	11	11	3.5	Yes	Analysis
9	Cape Town Open Chess Championship 2024 (Advanced)	2024-03-15	2024-03-17	Standard	Cape Town (WCT)	6	6	4.5	Yes	Analysis
10	Cape Town Masters Challenge 2024 (Advanced)	2024-01-03	2024-01-07	Standard	Cape Town (WCT)	7	7	5	Yes	Analysis
11	Western Cape Closed Championship 2023 (A)	2023-09-23	2023-09-25	Standard	Cape Town (WCT)	6	6	2.5	Yes	Analysis
12	WP Club League 2023 (A)	2023-07-29	2023-09-09	Standard	Cape Town (WCT)	11	11	2	Yes	Analysis
13	WP Closed 2023 (B)	2023-06-15	2023-06-18	Standard	Cape Town (WCT)	7	7	2.5	Yes	Analysis
14	GPCA Rapid 2023 (Advanced)	2023-06-24	2023-06-24	Rapid	Cape Town (WCT)	7	0	0	No	Analysis
15	Cape Town Masters Challenge 2023 (Open)	2023-01-04	2023-01-08	Standard	Cape Town (WCT)	5	5	3	Yes	Analysis
16	2022 Western Province Club League (Premier)	2022-08-20	2022-10-01	Standard	Cape Town (WCT)	11	11	5.5	Yes	Analysis
17	South African Open 2022 (Championship)	2022-07-09	2022-07-17	Standard	Cape Town (WCT)	11	11	3.5	Yes	Analysis
18	WP Closed 2022 (B)	2022-06-16	2022-06-16	Standard	Cape Town (WCT)	7	7	3.5	Yes	Analysis
19	2022 South African Closed Chess Championships (Senior)	2022-05-07	2022-05-14	Standard	Chess South Africa (CSA)	9	9	6.5	Yes	Analysis
20	Western Cape Closed 2021 (Championship)	2021-09-24	2021-09-26	Standard	Cape Winelands (WCW)	6	4	0.5	Yes	Analysis
21	CWP Closed 2021 (B)	2021-09-11	2021-09-19	Standard	Cape Town (WCT)	7	7	2	Yes	Analysis
22	Western Cape Women`s Month Tournament 2021 (Championship)	2021-08-06	2021-08-09	Standard	West Coast (WCU)	6	6	4.5	Yes	Analysis
23	WP Open 2021 (Championship)	2021-05-08	2021-05-09	Standard	Cape Town (WCT)	6	6	3	Yes	Analysis
24	FIDE World Senior Team Championship 2020	2020-03-06	2020-03-12	Standard	Czech Republic (CZE)	7	6	1.5	Yes	Analysis
25	2019 South African Closed Chess Championships (Senior)	2019-12-07	2019-12-17	Standard	Cape Town (WCT)	11	11	7	Yes	Analysis
26	2019 Western Cape Closed Chess Championships (Senior)	2019-09-21	2019-09-24	Standard	Cape Winelands (WCW)	6	6	4	Yes	Analysis
27	2019 Western Province League (Premier)	2019-07-27	2019-09-07	Standard	Cape Town (WCT)	11	10	2	Yes	Analysis
28	2019 GPCA Rapid (Open)	2019-06-29	2019-06-29	Rapid	Cape Town (WCT)	7	7	4	Yes	Analysis
29	2018 AFRICAN AMATEUR CHAMPIONSHIPS	2018-02-01	2019-01-06	Standard	Namibia (NAM)	9	9	6	Yes	Analysis
30	Cape of Good Hope Open 2019 (Prestige)	2019-01-25	2019-01-28	Standard	Cape Town (WCT)	6	6	4	Yes	Analysis
31	ACL Open 2018 (Elite)	2018-12-07	2018-12-09	Standard	Cape Town (WCT)	5	5	2	Yes	Analysis
32	ACL Chess Festival 2018 (Elite)	2018-10-05	2018-10-07	Standard	Cape Town (WCT)	5	5	1.5	Yes	Analysis
33	2018 Western Province League (Premier)	2018-08-04	2018-09-15	Standard	Cape Town (WCT)	11	10	4	Yes	Analysis
34	World Team Championship 50+, 65+ 2018	2018-07-07	2018-07-15	Standard	Germany (GER)	9	5	2	Yes	Analysis
35	Crossroads Open Chess Championship 2018 (Elite)	2018-04-27	2018-04-29	Standard	Cape Town (WCT)	6	5	2.5	Yes	Analysis
36	2018 Western Province Open (Prestige)	2018-03-02	2018-03-04	Standard	Cape Town (WCT)	6	6	3	Yes	Analysis
37	2018 Steinitz Chess Festival (Prestige)	2018-03-21	2018-03-25	Standard	Cape Town (WCT)	7	7	2	Yes	Analysis

#	Games	Start				End
1	6	Tournament Cape Town Masters Challenge 2024				Tournament Cape Town Open Chess Championship 2024
		date 2024-01-05	rnd 5	type Standard	result 1	date 2024-03-16	rnd 3	type Standard	result 0.5
		Opponent Willenberg, RC (Roland)				Opponent Vassen, K (Keean)
2	5	Tournament Crossroads Open Chess Championship 2018				Tournament World Team Championship 50+, 65+ 2018
		date 2018-04-29	rnd 5	type Standard	result 1	date 2018-07-11	rnd 5	type Standard	result 0.5
		Opponent Hastie, SEH (Sachin)				Opponent Luger,Jens
3	4	Tournament Cape Town Masters Challenge 2025				Tournament Cape Town Masters Challenge 2025
		date 2025-01-06	rnd 1	type Standard	result 1	date 2025-01-08	rnd 4	type Standard	result 0.5
		Opponent Machet, J (Jordan)				Opponent Ngudle, M (Mandisi)

#	Games	Start				End
1	6	Tournament Cape Town Masters Challenge 2024				Tournament Cape Town Open Chess Championship 2024
		date 2024-01-05	rnd 5	type Standard	result 1	date 2024-03-16	rnd 3	type Standard	result 0.5
		Opponent Willenberg, RC (Roland)				Opponent Vassen, K (Keean)
2	5	Tournament Crossroads Open Chess Championship 2018				Tournament World Team Championship 50+, 65+ 2018
		date 2018-04-29	rnd 5	type Standard	result 1	date 2018-07-11	rnd 5	type Standard	result 0.5
		Opponent Hastie, SEH (Sachin)				Opponent Luger,Jens
3	4	Tournament Cape Town Masters Challenge 2025				Tournament Cape Town Masters Challenge 2025
		date 2025-01-06	rnd 1	type Standard	result 1	date 2025-01-08	rnd 4	type Standard	result 0.5
		Opponent Machet, J (Jordan)				Opponent Ngudle, M (Mandisi)

#	Games	Start				End
1	2	Tournament Hermanus Chess Club Open 2024				Tournament Hermanus Chess Club Open 2024
		date 2024-04-20	rnd 6	type Rapid	result 1	date 2024-04-20	rnd 7	type Rapid	result 1
		Opponent February, E (Ethan)				Opponent Pietersen, W (Willmore)
2	2	Tournament Hermanus Chess Club Open 2024				Tournament Hermanus Chess Club Open 2024
		date 2024-04-20	rnd 2	type Rapid	result 1	date 2024-04-20	rnd 3	type Rapid	result 1
		Opponent Whyatt, B (Benji)				Opponent Prinsloo, L (Lyle)
3	2	Tournament 2019 GPCA Rapid				Tournament 2019 GPCA Rapid
		date 2019-06-29	rnd 1	type Rapid	result 1	date 2019-06-29	rnd 2	type Rapid	result 1
		Opponent Brand, R (Robin)				Opponent Bhawoodien, SH (Shabier)

No games found.

#	Games	Start				End

#	Games	Start				End
1	5	Tournament Cape Town Masters Challenge 2024				Tournament Cape Town Open Chess Championship 2024
		date 2024-01-05	rnd 5	type Standard	result 1	date 2024-03-16	rnd 2	type Standard	result 1
		Opponent Willenberg, RC (Roland)				Opponent Tsabola, B (Bright)
2	4	Tournament 2022 South African Closed Chess Championships				Tournament 2022 South African Closed Chess Championships
		date 2022-05-08	rnd 2	type Standard	result 1	date 2022-05-10	rnd 5	type Standard	result 1
		Opponent Van Schaik, MP (Michael)				Opponent Esau, O (Omar)
3	4	Tournament 2019 Western Cape Closed Chess Championships				Tournament 2019 South African Closed Chess Championships
		date 2019-09-24	rnd 6	type Standard	result 1	date 2019-12-09	rnd 3	type Standard	result 1
		Opponent Galleid, S (Stephen)				Opponent November, EJ (Edwin)

#	Games	Start				End
1	5	Tournament Cape Town Masters Challenge 2024				Tournament Cape Town Open Chess Championship 2024
		date 2024-01-05	rnd 5	type Standard	result 1	date 2024-03-16	rnd 2	type Standard	result 1
		Opponent Willenberg, RC (Roland)				Opponent Tsabola, B (Bright)
2	4	Tournament 2022 South African Closed Chess Championships				Tournament 2022 South African Closed Chess Championships
		date 2022-05-08	rnd 2	type Standard	result 1	date 2022-05-10	rnd 5	type Standard	result 1
		Opponent Van Schaik, MP (Michael)				Opponent Esau, O (Omar)
3	4	Tournament 2019 Western Cape Closed Chess Championships				Tournament 2019 South African Closed Chess Championships
		date 2019-09-24	rnd 6	type Standard	result 1	date 2019-12-09	rnd 3	type Standard	result 1
		Opponent Galleid, S (Stephen)				Opponent November, EJ (Edwin)

#	Games	Start				End
1	2	Tournament Hermanus Chess Club Open 2024				Tournament Hermanus Chess Club Open 2024
		date 2024-04-20	rnd 6	type Rapid	result 1	date 2024-04-20	rnd 7	type Rapid	result 1
		Opponent February, E (Ethan)				Opponent Pietersen, W (Willmore)
2	2	Tournament Hermanus Chess Club Open 2024				Tournament Hermanus Chess Club Open 2024
		date 2024-04-20	rnd 2	type Rapid	result 1	date 2024-04-20	rnd 3	type Rapid	result 1
		Opponent Whyatt, B (Benji)				Opponent Prinsloo, L (Lyle)
3	2	Tournament 2019 GPCA Rapid				Tournament 2019 GPCA Rapid
		date 2019-06-29	rnd 1	type Rapid	result 1	date 2019-06-29	rnd 2	type Rapid	result 1
		Opponent Brand, R (Robin)				Opponent Bhawoodien, SH (Shabier)

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	Galleid ,S (Stephen)	6	2.5	-70.8	6	2.5	-70.8	0	0	0	0	0	0
1	Galleid ,S (Stephen)	6	1621.2	1550.4	6	1623.9	1550.4	0	0	0	0	0	0
2	Southey ,AM (Andrew Mcnab)	5	2	-85	5	2	-85	0	0	0	0	0	0
2	Southey ,AM (Andrew Mcnab)	5	1732.8	1647.8	5	1721.8	1647.8	0	0	0	0	0	0
3	Braaf ,J (Jiraan)	5	1.5	-170	5	1.5	-170	0	0	0	0	0	0
3	Braaf ,J (Jiraan)	5	1786.3	1616.3	5	1791.8	1616.3	0	0	0	0	0	0
4	Bhawoodien ,SH (Shabier Husain)	5	2	-85	4	1	-212.5	1	1	425	0	0	0
4	Bhawoodien ,SH (Shabier Husain)	5	1974.8	1889.8	4	1996.2	1762.3	1	2017	2399.8	0	0	0
5	Lewis ,MMM (Mark Martin)	4	1	-212.5	4	1	-212.5	0	0	0	0	0	0
5	Lewis ,MMM (Mark Martin)	4	1842.1	1629.6	4	1858.2	1629.6	0	0	0	0	0	0
6	Mnyasta ,T (Tezihano)	4	2.5	106.2	4	2.5	106.2	0	0	0	0	0	0
6	Mnyasta ,T (Tezihano)	4	1839.2	1945.4	4	1834.3	1945.4	0	0	0	0	0	0
7	De Jager ,LJ (Luan Johannes)	4	0.5	-318.8	4	0.5	-318.8	0	0	0	0	0	0
7	De Jager ,LJ (Luan Johannes)	4	1834.8	1516	4	1853.9	1516	0	0	0	0	0	0
8	Willenberg ,RC (Roland Chester)	4	2	0	4	2	0	0	0	0	0	0	0
8	Willenberg ,RC (Roland Chester)	4	1630.1	1630.1	4	1612.5	1630.1	0	0	0	0	0	0
9	Flores Bartoli ,A (Andrew)	3	0.5	-283.3	3	0.5	-283.3	0	0	0	0	0	0
9	Flores Bartoli ,A (Andrew)	3	1726.5	1443.1	3	1733.2	1443.1	0	0	0	0	0	0
10	Esau ,O (Omar Omar)	3	2	141.7	3	2	141.7	0	0	0	0	0	0
10	Esau ,O (Omar Omar)	3	1448.3	1590	3	1456.7	1590	0	0	0	0	0	0

Norms

No norms achieved.

#	Norm	Tournament	Start	End	Rounds	Games	Score	Details

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PLAYER PAGE

Personal

Ohlson, C (Cecil)

Ratings

Game statistics

Rankings

Historical performance

Last 24 raw ratings

Rating graph

Tournaments

Top 3 Streaks

Top 10 opponents most often played

Norms