Chess South Africa Ratings Database

PLAYER PAGE

Personal

May, JM (Jaco)

Chess SA id

183021986

FIDE id

Date of birth

1983-12-14 (Adult)

Gender

Male

Region

Cape Winelands (WCW)

Citizen

RSA

Titles

Chess SA registered

Last active game

2025-03-23

Personal details last changed

1900-01-01

Junior GPX Games

Junior GPX Points

Item	Main	Standard	Rapid	Blitz
Rating	894.5	858.2	1041.6	761
Raw rating	894.5	858.2	1041.6	761
Weighted rating	877.8	834.8	1041.1	761
Weighted performance	708	688.1	0	0
Floor	500	500	541.6	500
K-factor	40	40	40	40
Min/Max rating change allowed	256.2	269.8	207.8	309.9
Highest rating	1294.4 2018-04-01	1294.4 2018-04-01	1200 2018-02-01	1200 2024-02-01
Highest raw rating	894.5 2025-04-01	858.2 2025-04-01	1041.6 2024-02-01	761 2024-02-01
Highest weighted rating	894.5 2024-11-01	825.4 2025-08-01	1041.6 2024-11-01	761 2024-11-01
Highest weighted performance	1294.4 2018-04-01	1294.4 2018-04-01	1200 2018-02-01	1200 2024-02-01

Prediction
Item	Main	Standard	Rapid	Blitz
Rating change	0	0	0	0
New rating	894.5	858.2	1041.6	761
Analysis
Rating	894.5	858.2	1041.6	761
Raw rating	894.5	858.2	1041.6	761
Weighted rating	877.8	834.8	1041.1
Weighted performance	708	688.1	0
K-factor	40	40	40	40
Floor	500	500	541.6	500
Max/Min rating change allowed	256.2	269.8	207.8	309.9
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	894.5	858.2	1041.6	761
New weighted rating	879.7	837.5	1041.6	761
New weighted performance	702.5	682.8	0	0
Temp new rating	894.5	858.2	1041.6	761
Temp new rating +/-	0	0	0	0
Final new rating +/-	0	0	0	0
New rating	894.5	858.2	1041.6	761
New K-factor	40	40	40	40
New floor	500	500	541.6	500

Item	Main	Standard	Rapid
	0	0	0
	6	6	0
	5	5	0
	5	5	0
	5	5	0
	0	0	0
History	139	121	18

Games since
	Main 11	Standard 11		Rapid 0		Blitz 0
Gender	Male
Age group	Adult
Region	Cape Winelands (WCW)
Province	Western Cape (WC)
Main
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
Adult	-1		-1		-1
Adult Male	-1		-1		-1
Standard
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
Adult	-1		-1		-1
Adult Male	-1		-1		-1
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	6	2	33.33	-141.7	1160.3	1018.6
Standard	6	2	33.33	-141.7	1160.3	1018.6
Rapid	0	0	0	0	0	0
Blitz	0	0	0	0	0	0
History
	Games	Score	%	Dp	AvgOpp	Performance
Main	37	9.5	25.68	-206.8	1160.1	953.3
Standard	27	5.5	20.37	-251.9	1148.5	896.6
Rapid	10	4	40	-85	1191.6	1106.6
Blitz	0	0	0	0	0	0

Date	Main	Standard	Rapid	Blitz
2025-11-01	894.5	858.2	1041.6	761
2025-09-30	894.5	858.2	1041.6	761
2025-09-01	894.5	858.2	1041.6	761
2025-08-01	894.5	858.2	1041.6	761
2025-07-01	894.5	858.2	1041.6	761
2025-06-01	894.5	858.2	1041.6	761
2025-05-01	894.5	858.2	1041.6	761
2025-04-01	894.5	858.2	1041.6	761
2025-03-01	859.2	806.6	1041.6	761
2025-02-01	859.2	806.6	1041.6	761
2025-01-01	855.9	806.6	1041.6	761
2024-12-01	855.9	806.6	1041.6	761
2024-11-01	855.9	806.6	1041.6	761
2024-10-01	855.9	806.6	1041.6	761
2024-09-01	855.9	806.6	1041.6	761
2024-08-01	855.9	806.6	1041.6	761
2024-07-01	855.9	806.6	1041.6	761
2024-09-01	855.9	806.6	1041.6	761
2024-05-01	855.9	806.6	1041.6	761
2024-04-01	865.2	805.8	1041.6	761
2024-03-01	865.2	805.8	1041.6	761
2024-02-01	865.2	805.8	1041.6	761
2024-01-01	865.2	805.8	1041.6	761
2023-12-01	865.2	805.8	895.8	761

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	SA Braille Open 2025	2025-03-22	2025-03-23	Standard	Cape Winelands (WCW)	6	6	2	Yes	Analysis

Last 500 tournaments since 01 January 2018

#	Tournament	Start	End	Type	Host	Rounds	Games	Score	Cfr	Analysis
1	SA Braille Open 2025	2025-03-22	2025-03-23	Standard	Cape Winelands (WCW)	6	6	2	Yes	Analysis
2	South African Braille Open 2024	2024-03-09	2024-03-09	Standard	Cape Winelands (WCW)	5	5	0.5	Yes	Analysis
3	SA Braille South 2023	2023-03-18	2023-03-19	Standard	Cape Winelands (WCW)	5	5	1.5	Yes	Analysis
4	Western Cape Closed Championship 2022 (Open)	2022-09-24	2022-09-25	Standard	Cape Winelands (WCW)	6	5	0	Yes	Analysis
5	Robertson Chess 2020 (Open)	2020-03-07	2020-03-07	Rapid	Cape Winelands (WCW)	5	5	3	Yes	Analysis
6	Robertson Strategema 2019 (Open)	2019-10-05	2019-10-05	Rapid	Cape Winelands (WCW)	5	5	1	Yes	Analysis
7	SA Braille Worcester 2019	2019-03-23	2019-03-24	Standard	Cape Winelands (WCW)	5	4	0	Yes	Analysis
8	Sa Braille Worcester Open 2018	2018-04-27	2018-04-28	Standard	Cape Winelands (WCW)	7	2	1.5	Yes	Analysis

#	Games	Start				End
1	3	Tournament Robertson Chess 2020				Tournament Robertson Chess 2020
		date 2020-03-07	rnd 3	type Rapid	result 1	date 2020-03-07	rnd 5	type Rapid	result 1
		Opponent Mare, I (Isabel)				Opponent Rossouw, I (Iain)
2	2	Tournament SA Braille South 2023				Tournament SA Braille South 2023
		date 2023-03-18	rnd 1	type Standard	result 0.5	date 2023-03-18	rnd 2	type Standard	result 1
		Opponent Scheepers, GP (George Philippus)				Opponent Kriel, IM (Isabel Mare)
3	2	Tournament Sa Braille Worcester Open 2018				Tournament Sa Braille Worcester Open 2018
		date 2018-04-27	rnd 4	type Standard	result 1	date 2018-04-27	rnd 5	type Standard	result 0.5
		Opponent Bezuidenhout, S (Simone)				Opponent Meyer, L (Lukas)

#	Games	Start				End
1	2	Tournament SA Braille South 2023				Tournament SA Braille South 2023
		date 2023-03-18	rnd 1	type Standard	result 0.5	date 2023-03-18	rnd 2	type Standard	result 1
		Opponent Scheepers, GP (George Philippus)				Opponent Kriel, IM (Isabel Mare)
2	2	Tournament Sa Braille Worcester Open 2018				Tournament Sa Braille Worcester Open 2018
		date 2018-04-27	rnd 4	type Standard	result 1	date 2018-04-27	rnd 5	type Standard	result 0.5
		Opponent Bezuidenhout, S (Simone)				Opponent Meyer, L (Lukas)
3	1	Tournament SA Braille Open 2025				Tournament SA Braille Open 2025
		date 2025-03-23	rnd 5	type Standard	result 1	date 2025-03-23	rnd 5	type Standard	result 1
		Opponent Rossouw, J (Joan)				Opponent Rossouw, J (Joan)

#	Games	Start				End
1	3	Tournament Robertson Chess 2020				Tournament Robertson Chess 2020
		date 2020-03-07	rnd 3	type Rapid	result 1	date 2020-03-07	rnd 5	type Rapid	result 1
		Opponent Mare, I (Isabel)				Opponent Rossouw, I (Iain)
2	1	Tournament Robertson Strategema 2019				Tournament Robertson Strategema 2019
		date 2019-10-05	rnd 1	type Rapid	result 1	date 2019-10-05	rnd 1	type Rapid	result 1
		Opponent Rahn, MC (Marlene)				Opponent Rahn, MC (Marlene)

No games found.

#	Games	Start				End

#	Games	Start				End
1	3	Tournament Robertson Chess 2020				Tournament Robertson Chess 2020
		date 2020-03-07	rnd 3	type Rapid	result 1	date 2020-03-07	rnd 5	type Rapid	result 1
		Opponent Mare, I (Isabel)				Opponent Rossouw, I (Iain)
2	1	Tournament SA Braille Open 2025				Tournament SA Braille Open 2025
		date 2025-03-23	rnd 5	type Standard	result 1	date 2025-03-23	rnd 5	type Standard	result 1
		Opponent Rossouw, J (Joan)				Opponent Rossouw, J (Joan)
3	1	Tournament SA Braille Open 2025				Tournament SA Braille Open 2025
		date 2025-03-22	rnd 3	type Standard	result 1	date 2025-03-22	rnd 3	type Standard	result 1
		Opponent Kruger, H (Hendrik)				Opponent Kruger, H (Hendrik)

#	Games	Start				End
1	1	Tournament SA Braille Open 2025				Tournament SA Braille Open 2025
		date 2025-03-23	rnd 5	type Standard	result 1	date 2025-03-23	rnd 5	type Standard	result 1
		Opponent Rossouw, J (Joan)				Opponent Rossouw, J (Joan)
2	1	Tournament SA Braille Open 2025				Tournament SA Braille Open 2025
		date 2025-03-22	rnd 3	type Standard	result 1	date 2025-03-22	rnd 3	type Standard	result 1
		Opponent Kruger, H (Hendrik)				Opponent Kruger, H (Hendrik)
3	1	Tournament SA Braille South 2023				Tournament SA Braille South 2023
		date 2023-03-18	rnd 2	type Standard	result 1	date 2023-03-18	rnd 2	type Standard	result 1
		Opponent Kriel, IM (Isabel Mare)				Opponent Kriel, IM (Isabel Mare)

#	Games	Start				End
1	3	Tournament Robertson Chess 2020				Tournament Robertson Chess 2020
		date 2020-03-07	rnd 3	type Rapid	result 1	date 2020-03-07	rnd 5	type Rapid	result 1
		Opponent Mare, I (Isabel)				Opponent Rossouw, I (Iain)
2	1	Tournament Robertson Strategema 2019				Tournament Robertson Strategema 2019
		date 2019-10-05	rnd 1	type Rapid	result 1	date 2019-10-05	rnd 1	type Rapid	result 1
		Opponent Rahn, MC (Marlene)				Opponent Rahn, MC (Marlene)

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	Rossouw ,J (Joan)	4	1	-212.5	3	1	-141.7	1	0	-425	0	0	0
1	Rossouw ,J (Joan)	4	1122	909.5	3	1098.3	980.3	1	1200	697	0	0	0
2	Bresler ,C (Conrad)	3	0	-425	3	0	-425	0	0	0	0	0	0
2	Bresler ,C (Conrad)	3	1137.2	712.2	3	1131.3	712.2	0	0	0	0	0	0
3	Meyer ,L (Lukas)	2	0.5	-212.5	2	0.5	-212.5	0	0	0	0	0	0
3	Meyer ,L (Lukas)	2	946.4	733.9	2	946.8	733.9	0	0	0	0	0	0
4	Bezuidenhout ,S (Simone)	2	1	0	2	1	0	0	0	0	0	0	0
4	Bezuidenhout ,S (Simone)	2	1130.1	1130.1	2	1125.6	1130.1	0	0	0	0	0	0
5	Geyer ,D (David)	2	0	-425	1	0	-425	1	0	-425	0	0	0
5	Geyer ,D (David)	2	1283	858	1	1300.6	858	1	1196	858	0	0	0
6	Richter ,HL (Heinrich Lodewikus)	2	0	-425	1	0	-425	1	0	-425	0	0	0
6	Richter ,HL (Heinrich Lodewikus)	2	1328.1	903.1	1	1330.3	903.1	1	1272.7	903.1	0	0	0
7	Reynecke ,K (Kiana)	1	0	-425	1	0	-425	0	0	0	0	0	0
7	Reynecke ,K (Kiana)	1	1196.1	771.1	1	1195.3	771.1	0	0	0	0	0	0
8	Klue ,C (Christiaan)	1	0	-425	1	0	-425	0	0	0	0	0	0
8	Klue ,C (Christiaan)	1	1200	775	1	1200	775	0	0	0	0	0	0
9	Kruger ,FJ (Fransiena Jacoba)	1	0	-425	1	0	-425	0	0	0	0	0	0
9	Kruger ,FJ (Fransiena Jacoba)	1	1283.5	858.5	1	1316.7	858.5	0	0	0	0	0	0
10	Drury ,N (Nicholas)	1	0	-425	1	0	-425	0	0	0	0	0	0
10	Drury ,N (Nicholas)	1	1246.9	821.9	1	1270.7	821.9	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

May, JM (Jaco)

Ratings

Game statistics

Rankings

Historical performance

Last 24 raw ratings

Rating graph

Tournaments

Top 3 Streaks

Top 10 opponents most often played

Norms