Chess South Africa Ratings Database

PLAYER PAGE

Personal

Mendelsohn, DC (David Charles)

Chess SA id

155022650

FIDE id

Date of birth

1955-10-05 (Adult)

Gender

Male

Region

Johannesburg Metro (GJM)

Citizen

RSA

Titles

Chess SA registered

Last active game

2025-12-16

Personal details last changed

1900-01-01

Junior GPX Games

Junior GPX Points

Item	Main	Standard	Rapid	Blitz
Rating	1666	1674.7	1796.3	1853.5
Raw rating	1625.3	1668.8	1735.6	1853.5
Weighted rating	1666	1674.7	1796.3	1853.5
Weighted performance	1498.5	1602.6	0	0
Floor	1353.5	1353.5	1353.5	1353.5
K-factor	24	24	24	24
Min/Max rating change allowed	90.5	85	77.3	65.4
Highest rating	1853.5 2018-03-01	1853.5 2018-03-01	1853.5 2018-03-01	1853.5 2019-09-01
Highest raw rating	1853.5 2018-01-01	1853.5 2018-01-01	1853.5 2018-01-01	1853.5 2024-02-01
Highest weighted rating	1853.5 2018-03-01	1853.5 2018-03-01	1853.5 2018-03-01	1853.5 2019-09-01
Highest weighted performance	1805.1 2018-03-01	1809.5 2018-03-01	1512.2 2018-05-01	1200 2024-02-01

Prediction
Item	Main	Standard	Rapid	Blitz
Rating change	-2.7	0.9	-5.2	0
New rating	1663.3	1675.5	1791.1	1853.5
Analysis
Rating	1666	1674.7	1796.3	1853.5
Raw rating	1625.3	1668.8	1735.6	1853.5
Weighted rating	1666	1674.7	1796.3
Weighted performance	1498.5	1602.6	0
K-factor	24	24	24	24
Floor	1353.5	1353.5	1353.5	1353.5
Max/Min rating change allowed	90.5	85	77.3	65.4
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	1625.3	1668.8	1735.6	1853.5
New weighted rating	1663.3	1675.5	1791.1	1853.5
New weighted performance	1488.4	1591.7	0	0
Temp new rating	1663.3	1675.5	1791.1	1853.5
Temp new rating +/-	-2.7	0.9	-5.2	0
Final new rating +/-	-2.7	0.9	-5.2	0
New rating	1663.3	1675.5	1791.1	1853.5
New K-factor	24	24	24	24
New floor	1353.5	1353.5	1353.5	1353.5

Item	Main	Standard	Rapid
	0	0	0
	46	40	6
	52	47	5
	37	37	0
	17	17	0
	5	5	0
History	754	716	38

Games since
	Main 98	Standard 87		Rapid 11		Blitz 0
Gender	Male
Age group	Adult
Region	Johannesburg Metro (GJM)
Province	Gauteng (GT)
Main
	RSA		Province		Region
Overall	388		144		57
Male	362		133		49
Adult	209		78		31
Adult Male	196		75		28
Standard
	RSA		Province		Region
Overall	365		144		53
Male	338		133		45
Adult	195		78		29
Adult Male	182		75		26
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	46	20.5	44.57	-46.2	1687.3	1641.1
Standard	40	19	47.5	-21.2	1719.3	1698.1
Rapid	6	1.5	25	-212.5	1474	1261.5
Blitz	0	0	0	0	0	0
History
	Games	Score	%	Dp	AvgOpp	Performance
Main	240	125.5	52.29	19.5	1620	1639.5
Standard	222	119.5	53.83	32.5	1616	1648.5
Rapid	18	6	33.33	-141.7	1669.7	1528
Blitz	0	0	0	0	0	0

Date	Main	Standard	Rapid	Blitz
2026-01-01	1625.3	1668.8	1735.6	1853.5
2025-11-30	1644.6	1668.8	1798.7	1853.5
2025-11-01	1644.6	1668.8	1798.7	1853.5
2025-09-30	1687.3	1731	1798.7	1853.5
2025-09-01	1687.3	1731	1798.7	1853.5
2025-08-01	1672.9	1715.9	1798.7	1853.5
2025-07-01	1701.3	1701.1	1804.9	1853.5
2025-06-01	1692.2	1688.4	1804.9	1853.5
2025-05-01	1709.9	1708.1	1804.9	1853.5
2025-04-01	1700.3	1693.5	1804.9	1853.5
2025-03-01	1674	1656	1804.9	1853.5
2025-02-01	1674	1656	1804	1853.5
2025-01-01	1674	1656	1789.9	1853.5
2024-12-01	1669.5	1646.4	1789.9	1853.5
2024-11-01	1663	1637	1789.9	1853.5
2024-10-01	1615.6	1599.6	1810.3	1853.5
2024-09-01	1615.6	1599.6	1810.3	1853.5
2024-11-01	1618.5	1598.2	1810.3	1853.5
2024-07-01	1641.4	1624.4	1810.3	1853.5
2024-06-01	1641.4	1624.4	1810.3	1853.5
2024-05-01	1645.9	1634	1810.3	1853.5
2024-04-01	1645.9	1634	1810.3	1853.5
2024-03-01	1640	1625.4	1810.3	1853.5
2024-02-01	1640	1625.4	1810.3	1853.5

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	Chess Power House Dec Rapid 2025 (A)	2025-12-16	2025-12-16	Rapid	Johannesburg Metro (GJM)	5	5	2	Yes	Analysis
2	Randburg Winter Swiss 2025	2025-07-29	2025-09-16	Standard	Johannesburg Metro (GJM)	8	8	3	Yes	Analysis
3	Chess Power House Aug Open 2025 (Prestige)	2025-08-16	2025-08-16	Standard	Ekurhuleni (GE)	5	4	1.5	Yes	Analysis
4	JMC - Trinity Randpark Ridge 2025 (A)	2025-07-26	2025-07-26	Standard	Johannesburg Metro (GJM)	5	4	2	Yes	Analysis
5	Randburg Chess Club Winter Rapid 2025	2025-07-15	2025-07-22	Rapid	Johannesburg Metro (GJM)	6	6	1.5	Yes	Analysis
6	Neil Savage Memorial Randburg Club Champs 2025	2025-05-06	2025-06-24	Standard	Johannesburg Metro (GJM)	8	8	4.5	Yes	Analysis
7	CPH May 2025 (A)	2025-05-03	2025-05-03	Standard	Johannesburg Metro (GJM)	5	4	0.5	Yes	Analysis
8	Randburg Chess Club New Year Swiss 2025	2025-02-11	2025-04-01	Standard	Johannesburg Metro (GJM)	8	7	4.5	Yes	Analysis
9	Chess Power House March Open 2025 (A)	2025-03-22	2025-03-22	Standard	Johannesburg Metro (GJM)	5	5	3	Yes	Analysis
10	Gauteng Inter-Region at UJ 2024 (Adult+Senior)	2024-12-07	2024-12-08	Standard	Johannesburg Metro (GJM)	5	5	3	Yes	Analysis
11	Randburg Summer Swiss 2024	2024-10-29	2024-11-26	Standard	Johannesburg Metro (GJM)	5	5	3	Yes	Analysis
12	Mzansi Summer Rapid 2024 (A)	2024-10-26	2024-10-26	Rapid	Johannesburg Metro (GJM)	6	5	3	Yes	Analysis
13	Randburg Spring Swiss 2024	2024-08-20	2024-10-08	Standard	Johannesburg Metro (GJM)	7	7	5.5	Yes	Analysis
14	Randburg Chess Club Winter Swiss 2024	2024-06-11	2024-07-30	Standard	Johannesburg Metro (GJM)	7	6	3.5	Yes	Analysis
15	Chess Power House July Open 2024 (A)	2024-07-20	2024-07-20	Standard	Johannesburg Metro (GJM)	5	5	1	Yes	Analysis
16	JMC Trinityhouse Randpark Ridge 2024 (A)	2024-07-13	2024-07-13	Standard	Johannesburg Metro (GJM)	5	5	2	Yes	Analysis
17	Randburg Chess Club Championship 2024	2024-04-09	2024-05-21	Standard	Johannesburg Metro (GJM)	7	7	4.5	Yes	Analysis
18	1st Knights Open Tournament 2024 (A)	2024-03-23	2024-03-23	Standard	Johannesburg Metro (GJM)	5	0	0	No	Analysis
19	Randburg Chess Club New Year Swiss 2024	2024-02-06	2024-02-06	Standard	Johannesburg Metro (GJM)	7	7	4	Yes	Analysis
20	Africawide Chess Championship 2023 (Open)	2023-11-03	2023-11-05	Standard	Johannesburg Metro (GJM)	7	7	4	Yes	Analysis
21	Randburg Club Championships Swiss 2023	2023-08-29	2023-10-10	Standard	Johannesburg Metro (GJM)	7	6	2.5	Yes	Analysis
22	Randburg Winter Swiss 2023	2023-06-13	2023-07-25	Standard	Johannesburg Metro (GJM)	7	7	5	Yes	Analysis
23	Randburg Autumn Swiss 2023	2023-04-11	2023-05-23	Standard	Johannesburg Metro (GJM)	7	5	3	Yes	Analysis
24	Randburg New Year Swiss 2023	2023-01-31	2023-03-14	Standard	Johannesburg Metro (GJM)	7	7	5	Yes	Analysis
25	JMC 1 St Peters 2023 (A)	2023-03-18	2023-03-18	Standard	Johannesburg Metro (GJM)	5	5	2	Yes	Analysis
26	Randburg Summer Swiss 2022	2022-10-25	2022-12-06	Standard	Johannesburg Metro (GJM)	7	6	4	Yes	Analysis
27	Randburg Club Championships Swiss 2022	2022-07-19	2022-09-06	Standard	Johannesburg Metro (GJM)	7	7	5.5	Yes	Analysis
28	Chessheroes Youth Day 2022 (A1)	2022-06-16	2022-06-18	Standard	Johannesburg Metro (GJM)	5	4	0	Yes	Analysis
29	2021 Lubowski Open Tournament (A)	2021-05-01	2021-05-02	Standard	Tshwane (GTP)	5	5	2.5	Yes	Analysis
30	Ekurhuleni Chess Kempton Park Open 2020 (A)	2020-11-21	2020-11-21	Standard	Ekurhuleni (GE)	5	5	1.5	Yes	Analysis
31	The King`s Cup League 2020 (A)	2020-03-07	2020-03-07	Standard	Johannesburg Metro (GJM)	5	5	3	Yes	Analysis
32	Randburg Chess Club Autum Swiss 2020	2020-02-04	2020-03-10	Standard	Johannesburg Metro (GJM)	6	6	3.5	Yes	Analysis
33	JNW Club - Trinityhouse Little Falls Open 2020 (A)	2020-03-14	2020-03-14	Standard	Johannesburg Metro (GJM)	5	5	2.5	Yes	Analysis
34	JNW Club - Trinityhouse Randpark Ridge Open 2020 (A)	2020-02-22	2020-02-22	Standard	Johannesburg Metro (GJM)	5	4	1	Yes	Analysis
35	JNW Club - Bryanston Open1 2020 (A)	2020-02-01	2020-02-01	Standard	Johannesburg Metro (GJM)	5	4	2	Yes	Analysis
36	The King`s Cup League 2019 (A)	2019-10-19	2019-10-19	Standard	Johannesburg Metro (GJM)	5	5	3.5	Yes	Analysis
37	Randburg Chess Club Winter Swiss 2019	2019-07-30	2019-09-03	Standard	Johannesburg Metro (GJM)	6	6	4	Yes	Analysis
38	The King`s Cup League - Stage 2 2019 (A)	2019-09-07	2019-09-07	Standard	Johannesburg Metro (GJM)	5	5	2	Yes	Analysis
39	JNW Club - Bryanston Open 2 2019 (A)	2019-05-11	2019-05-11	Standard	Johannesburg Metro (GJM)	5	5	2.5	Yes	Analysis
40	2018 Gauteng North Open (A)	2018-10-20	2018-10-21	Standard	Tshwane (GTP)	5	5	3	Yes	Analysis
41	JNW Club - Maragon Open 2018 (A)	2018-08-04	2018-08-04	Standard	Johannesburg Metro (GJM)	5	5	3	Yes	Analysis
42	SWVG Arnold Classic Rapid & Blitz 2018 (Rapid Prestige)	2018-05-19	2018-05-20	Rapid	Tshwane (GTP)	10	7	1.5	Yes	Analysis
43	JNW Club - Linden Open 2018 (A)	2018-04-14	2018-04-14	Standard	Johannesburg Metro (GJM)	5	5	2.5	Yes	Analysis
44	Randburg Club - Summer Swiss 2018	2018-01-30	2018-03-13	Standard	Johannesburg Metro (GJM)	7	5	3.5	Yes	Analysis
45	The Outpost Chess Club Open 2018 (A)	2018-03-16	2018-03-17	Standard	Johannesburg Metro (GJM)	6	6	3	Yes	Analysis

#	Games	Start				End
1	8	Tournament Gauteng Inter-Region at UJ 2024				Tournament Randburg Chess Club New Year Swiss 2025
		date 2024-12-07	rnd 3	type Standard	result 1	date 2025-03-11	rnd 5	type Standard	result 0.5
		Opponent Pillay, N (Nico)				Opponent De Lange, L (Luan)
2	8	Tournament Randburg Winter Swiss 2023				Tournament Randburg Club Championships Swiss 2023
		date 2023-06-13	rnd 1	type Standard	result 1	date 2023-08-29	rnd 1	type Standard	result 1
		Opponent Van Der Berg, J (Jay)				Opponent Mungal, Z (Zoey)
3	6	Tournament Randburg Spring Swiss 2024				Tournament Randburg Spring Swiss 2024
		date 2024-08-20	rnd 1	type Standard	result 1	date 2024-10-01	rnd 6	type Standard	result 1
		Opponent Harmse, J (Justin)				Opponent Ngubeni, JM (Jackie)

#	Games	Start				End
1	8	Tournament Gauteng Inter-Region at UJ 2024				Tournament Randburg Chess Club New Year Swiss 2025
		date 2024-12-07	rnd 3	type Standard	result 1	date 2025-03-11	rnd 5	type Standard	result 0.5
		Opponent Pillay, N (Nico)				Opponent De Lange, L (Luan)
2	8	Tournament Randburg Winter Swiss 2023				Tournament Randburg Club Championships Swiss 2023
		date 2023-06-13	rnd 1	type Standard	result 1	date 2023-08-29	rnd 1	type Standard	result 1
		Opponent Van Der Berg, J (Jay)				Opponent Mungal, Z (Zoey)
3	6	Tournament Randburg Spring Swiss 2024				Tournament Randburg Spring Swiss 2024
		date 2024-08-20	rnd 1	type Standard	result 1	date 2024-10-01	rnd 6	type Standard	result 1
		Opponent Harmse, J (Justin)				Opponent Ngubeni, JM (Jackie)

#	Games	Start				End
1	5	Tournament Mzansi Summer Rapid 2024				Tournament Randburg Chess Club Winter Rapid 2025
		date 2024-10-26	rnd 4	type Rapid	result 1	date 2025-07-15	rnd 2	type Rapid	result 1
		Opponent Badenhorst, N (Nicolaas Jacobus)				Opponent Maslekar, S (Siddhant)
2	2	Tournament SWVG Arnold Classic Rapid & Blitz 2018				Tournament SWVG Arnold Classic Rapid & Blitz 2018
		date 2018-05-19	rnd 1	type Rapid	result 0.5	date 2018-05-19	rnd 2	type Rapid	result 1
		Opponent Klaver, C (Cornelis)				Opponent Swartz, DS (David)

No games found.

#	Games	Start				End

#	Games	Start				End
1	6	Tournament Randburg Club Championships Swiss 2022				Tournament Randburg Summer Swiss 2022
		date 2022-08-16	rnd 4	type Standard	result 1	date 2022-11-01	rnd 2	type Standard	result 1
		Opponent Boshoff, E (Ernst)				Opponent Snyckers, FA (Frank)
2	5	Tournament Mzansi Summer Rapid 2024				Tournament Randburg Summer Swiss 2024
		date 2024-10-26	rnd 4	type Rapid	result 1	date 2024-11-05	rnd 2	type Standard	result 1
		Opponent Badenhorst, N (Nicolaas Jacobus)				Opponent Foley, PJ (Patrick)
3	4	Tournament Africawide Chess Championship 2023				Tournament Randburg Chess Club New Year Swiss 2024
		date 2023-11-05	rnd 7	type Standard	result 1	date 2024-02-06	rnd 3	type Standard	result 1
		Opponent Combrink, J (Juan-Louis)				Opponent Sparks, SJW (Stephen)

#	Games	Start				End
1	6	Tournament Randburg Club Championships Swiss 2022				Tournament Randburg Summer Swiss 2022
		date 2022-08-16	rnd 4	type Standard	result 1	date 2022-11-01	rnd 2	type Standard	result 1
		Opponent Boshoff, E (Ernst)				Opponent Snyckers, FA (Frank)
2	4	Tournament Africawide Chess Championship 2023				Tournament Randburg Chess Club New Year Swiss 2024
		date 2023-11-05	rnd 7	type Standard	result 1	date 2024-02-06	rnd 3	type Standard	result 1
		Opponent Combrink, J (Juan-Louis)				Opponent Sparks, SJW (Stephen)
3	3	Tournament Randburg Spring Swiss 2024				Tournament Randburg Spring Swiss 2024
		date 2024-09-10	rnd 4	type Standard	result 1	date 2024-10-01	rnd 6	type Standard	result 1
		Opponent Motshekga, K (Kabelo)				Opponent Ngubeni, JM (Jackie)

#	Games	Start				End
1	3	Tournament Mzansi Summer Rapid 2024				Tournament Mzansi Summer Rapid 2024
		date 2024-10-26	rnd 4	type Rapid	result 1	date 2024-10-26	rnd 6	type Rapid	result 1
		Opponent Badenhorst, N (Nicolaas Jacobus)				Opponent Hodgson, TF (Timothy)
2	1	Tournament Randburg Chess Club Winter Rapid 2025				Tournament Randburg Chess Club Winter Rapid 2025
		date 2025-07-15	rnd 2	type Rapid	result 1	date 2025-07-15	rnd 2	type Rapid	result 1
		Opponent Maslekar, S (Siddhant)				Opponent Maslekar, S (Siddhant)
3	1	Tournament SWVG Arnold Classic Rapid & Blitz 2018				Tournament SWVG Arnold Classic Rapid & Blitz 2018
		date 2018-05-19	rnd 2	type Rapid	result 1	date 2018-05-19	rnd 2	type Rapid	result 1
		Opponent Swartz, DS (David)				Opponent Swartz, DS (David)

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	Metcalfe ,AR (Allister Richard)	11	4	-115.9	11	4	-115.9	0	0	0	0	0	0
1	Metcalfe ,AR (Allister Richard)	11	1726.8	1610.9	11	1744.7	1610.9	0	0	0	0	0	0
2	Kleyn ,AE (Andrew Edward)	10	5	0	10	5	0	0	0	0	0	0	0
2	Kleyn ,AE (Andrew Edward)	10	1707.3	1707.3	10	1701.4	1707.3	0	0	0	0	0	0
3	Snyckers ,FA (Frank Alexander)	7	4.5	121.4	7	4.5	121.4	0	0	0	0	0	0
3	Snyckers ,FA (Frank Alexander)	7	1535.1	1656.5	7	1535.6	1656.5	0	0	0	0	0	0
4	Essop ,H (Haroon)	6	4	141.7	5	3.5	170	1	0.5	0	0	0	0
4	Essop ,H (Haroon)	6	1449.6	1591.3	5	1445.5	1619.6	1	1412.3	1449.6	0	0	0
5	Van Der Berg ,P (Pieter)	5	2	-85	5	2	-85	0	0	0	0	0	0
5	Van Der Berg ,P (Pieter)	5	1553.9	1468.9	5	1535.1	1468.9	0	0	0	0	0	0
6	Sparks ,SJW (Stephen)	5	4.5	340	5	4.5	340	0	0	0	0	0	0
6	Sparks ,SJW (Stephen)	5	1451.6	1791.6	5	1411.3	1791.6	0	0	0	0	0	0
7	Snyckers ,A (Adam)	5	3	85	5	3	85	0	0	0	0	0	0
7	Snyckers ,A (Adam)	5	1629	1714	5	1633.3	1714	0	0	0	0	0	0
8	Ngubeni ,JM (Jackie)	5	3	85	4	3	212.5	1	0	-425	0	0	0
8	Ngubeni ,JM (Jackie)	5	1548.1	1633.1	4	1548.2	1760.6	1	1582.1	1123.1	0	0	0
9	Essop ,R (Rashied)	4	1.5	-106.2	4	1.5	-106.2	0	0	0	0	0	0
9	Essop ,R (Rashied)	4	1425.9	1319.6	4	1438.5	1319.6	0	0	0	0	0	0
10	Mazibuko ,K (Khanya)	4	1.5	-106.2	4	1.5	-106.2	0	0	0	0	0	0
10	Mazibuko ,K (Khanya)	4	1972.1	1865.8	4	1978.7	1865.8	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

Mendelsohn, DC (David Charles)

Ratings

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Historical performance

Last 24 raw ratings

Rating graph

Tournaments

Top 3 Streaks

Top 10 opponents most often played

Norms