Chess South Africa Ratings Database

PLAYER PAGE

Personal

Pretorius, J (Johnro)

Chess SA id

1150141570

FIDE id

Date of birth

2015-04-30 (U12)

Gender

Male

Region

Ekurhuleni (GE)

Citizen

RSA

Titles

Chess SA registered

Last active game

2025-08-15

Personal details last changed

1900-01-01

Junior GPX Games

Junior GPX Points

1270.8

Item	Main	Standard	Rapid	Blitz
Rating	1271.2	1235.9	1268.8	1200
Raw rating	1271.2	1235.9	1268.8	1200
Weighted rating	1223.6	1212.7	1219.1	1200
Weighted performance	0	0	0	0
Floor	771.2	735.9	768.8	700
K-factor	36	36	36	36
Min/Max rating change allowed	149.8	157.6	150.3	165.8
Highest rating	1271.2 2025-09-01	1235.9 2025-09-01	1268.8 2025-06-01	1200 2018-10-01
Highest raw rating	1271.2 2025-09-01	1235.9 2025-09-01	1268.8 2025-06-01	1200 2024-02-01
Highest weighted rating	1212.8 2025-09-01	1207.8 2025-09-01	1268.8 2018-10-01	1200 2018-10-01
Highest weighted performance	1200 2019-12-01	1200 2024-02-01	1200 2019-12-01	1200 2024-02-01

Prediction
Item	Main	Standard	Rapid	Blitz
Rating change	0	0	0	0
New rating	1271.2	1235.9	1268.8	1200
Analysis
Rating	1271.2	1235.9	1268.8	1200
Raw rating	1271.2	1235.9	1268.8	1200
Weighted rating	1223.6	1212.7	1219.1
Weighted performance	0	0	0
K-factor	36	36	36	36
Floor	771.2	735.9	768.8	700
Max/Min rating change allowed	149.8	157.6	150.3	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	1271.2	1235.9	1268.8	1200
New weighted rating	1228.5	1215	1224.3	1200
New weighted performance	0	0	0	0
Temp new rating	1271.2	1235.9	1268.8	1200
Temp new rating +/-	0	0	0	0
Final new rating +/-	0	0	0	0
New rating	1271.2	1235.9	1268.8	1200
New K-factor	36	36	36	36
New floor	771.2	735.9	768.8	700

Item	Main	Standard	Rapid
	0	0	0
	16	10	6
	0	0	0
	0	0	0
	1	0	1
	0	0	0
History	17	10	7

Games since
	Main 16	Standard 10		Rapid 6		Blitz 0
Gender	Male
Age group	U12
Region	Ekurhuleni (GE)
Province	Gauteng (GT)
Main
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
U12	-1		-1		-1
U12 Male	-1		-1		-1
Standard
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
U12	-1		-1		-1
U12 Male	-1		-1		-1
Rapid
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
U12	-1		-1		-1
U12 Male	-1		-1		-1
Blitz
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
U12	-1		-1		-1
U12 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	16	9.5	59.38	79.7	1314.7	1394.3
Standard	10	4.5	45	-42.5	1335.2	1292.7
Rapid	6	5	83.33	283.3	1280.5	1563.8
Blitz	0	0	0	0	0	0
History
	Games	Score	%	Dp	AvgOpp	Performance
Main	17	9.5	55.88	50	1307.9	1357.9
Standard	10	4.5	45	-42.5	1335.2	1292.7
Rapid	7	5	71.43	182.1	1269	1451.1
Blitz	0	0	0	0	0	0

Date	Main	Standard	Rapid	Blitz
2025-11-01	1271.2	1235.9	1268.8	1200
2025-09-30	1271.2	1235.9	1268.8	1200
2025-09-01	1271.2	1235.9	1268.8	1200
2025-08-01	1267.4	1222.4	1268.8	1200
2025-07-01	1267.4	1222.4	1268.8	1200
2025-06-01	1267.4	1222.4	1268.8	1200
2025-05-01	1189	1200	1181.6	1200
2025-04-01	1189	1200	1181.6	1200
2025-03-01	1189	1200	1181.6	1200
2025-02-01	1189	1200	1181.6	1200
2025-01-01	1189	1200	1181.6	1200
2024-12-01	1189	1200	1181.6	1200
2024-11-01	1189	1200	1181.6	1200
2024-10-01	1189	1200	1181.6	1200
2024-09-01	1189	1200	1181.6	1200
2024-08-01	1189	1200	1181.6	1200
2024-07-01	1189	1200	1181.6	1200
2024-09-01	1189	1200	1181.6	1200
2024-05-01	1189	1200	1181.6	1200
2024-04-01	1189	1200	1181.6	1200
2024-03-01	1189	1200	1181.6	1200
2024-02-01	1189	1200	1181.6	1200
2024-01-01	1189	1200	1181.6	1200
2023-12-01	1189	1200	1181.6	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	2025 Tshwane South School District CLOSED League Championship (U11A)	2025-08-15	2025-08-15	Standard	Tshwane (GTP)	5	5	2	Yes	Analysis
2	RMS Rapid Chess Open 31 May 2025 (U11)	2025-05-31	2025-05-31	Rapid	Sedibeng (GSV)	6	6	5	Yes	Analysis
3	2025 Tshwane South School District Individual Finals (D4) (U11 Boys)	2025-05-10	2025-05-10	Standard	Tshwane (GTP)	5	5	2.5	Yes	Analysis

Last 500 tournaments since 01 January 2018

#	Tournament	Start	End	Type	Host	Rounds	Games	Score	Cfr	Analysis
1	2025 Tshwane South School District CLOSED League Championship (U11A)	2025-08-15	2025-08-15	Standard	Tshwane (GTP)	5	5	2	Yes	Analysis
2	RMS Rapid Chess Open 31 May 2025 (U11)	2025-05-31	2025-05-31	Rapid	Sedibeng (GSV)	6	6	5	Yes	Analysis
3	2025 Tshwane South School District Individual Finals (D4) (U11 Boys)	2025-05-10	2025-05-10	Standard	Tshwane (GTP)	5	5	2.5	Yes	Analysis
4	RMS Swiss For Rating of Players 2022 (U9)	2022-05-28	2022-05-28	Rapid	Ekurhuleni (GE)	7	1	0	Yes	Analysis

#	Games	Start				End
1	6	Tournament 2025 Tshwane South School District Individual Finals (D4)				Tournament RMS Rapid Chess Open 31 May 2025
		date 2025-05-10	rnd 5	type Standard	result 0.5	date 2025-05-31	rnd 5	type Rapid	result 1
		Opponent Vounatsos, L (Levi)				Opponent Koenig, L (Liam)
2	2	Tournament 2025 Tshwane South School District Individual Finals (D4)				Tournament 2025 Tshwane South School District Individual Finals (D4)
		date 2025-05-10	rnd 2	type Standard	result 1	date 2025-05-10	rnd 3	type Standard	result 1
		Opponent Lekhema, L (Letlotlo)				Opponent Erwee, HP (Hermanus Philipus)
3	1	Tournament 2025 Tshwane South School District CLOSED League Championship				Tournament 2025 Tshwane South School District CLOSED League Championship
		date 2025-08-15	rnd 4	type Standard	result 1	date 2025-08-15	rnd 4	type Standard	result 1
		Opponent Wessels, J (Jancko)				Opponent Wessels, J (Jancko)

#	Games	Start				End
1	2	Tournament 2025 Tshwane South School District Individual Finals (D4)				Tournament 2025 Tshwane South School District Individual Finals (D4)
		date 2025-05-10	rnd 2	type Standard	result 1	date 2025-05-10	rnd 3	type Standard	result 1
		Opponent Lekhema, L (Letlotlo)				Opponent Erwee, HP (Hermanus Philipus)
2	1	Tournament 2025 Tshwane South School District CLOSED League Championship				Tournament 2025 Tshwane South School District CLOSED League Championship
		date 2025-08-15	rnd 4	type Standard	result 1	date 2025-08-15	rnd 4	type Standard	result 1
		Opponent Wessels, J (Jancko)				Opponent Wessels, J (Jancko)
3	1	Tournament 2025 Tshwane South School District CLOSED League Championship				Tournament 2025 Tshwane South School District CLOSED League Championship
		date 2025-08-15	rnd 2	type Standard	result 1	date 2025-08-15	rnd 2	type Standard	result 1
		Opponent Nkwansi, T (Tyra)				Opponent Nkwansi, T (Tyra)

#	Games	Start				End
1	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 Du Bruyn, J (Juan)				Opponent Koenig, L (Liam)

No games found.

#	Games	Start				End

#	Games	Start				End
1	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 Du Bruyn, J (Juan)				Opponent Koenig, L (Liam)
2	2	Tournament 2025 Tshwane South School District Individual Finals (D4)				Tournament 2025 Tshwane South School District Individual Finals (D4)
		date 2025-05-10	rnd 2	type Standard	result 1	date 2025-05-10	rnd 3	type Standard	result 1
		Opponent Lekhema, L (Letlotlo)				Opponent Erwee, HP (Hermanus Philipus)
3	1	Tournament 2025 Tshwane South School District CLOSED League Championship				Tournament 2025 Tshwane South School District CLOSED League Championship
		date 2025-08-15	rnd 4	type Standard	result 1	date 2025-08-15	rnd 4	type Standard	result 1
		Opponent Wessels, J (Jancko)				Opponent Wessels, J (Jancko)

#	Games	Start				End
1	2	Tournament 2025 Tshwane South School District Individual Finals (D4)				Tournament 2025 Tshwane South School District Individual Finals (D4)
		date 2025-05-10	rnd 2	type Standard	result 1	date 2025-05-10	rnd 3	type Standard	result 1
		Opponent Lekhema, L (Letlotlo)				Opponent Erwee, HP (Hermanus Philipus)
2	1	Tournament 2025 Tshwane South School District CLOSED League Championship				Tournament 2025 Tshwane South School District CLOSED League Championship
		date 2025-08-15	rnd 4	type Standard	result 1	date 2025-08-15	rnd 4	type Standard	result 1
		Opponent Wessels, J (Jancko)				Opponent Wessels, J (Jancko)
3	1	Tournament 2025 Tshwane South School District CLOSED League Championship				Tournament 2025 Tshwane South School District CLOSED League Championship
		date 2025-08-15	rnd 2	type Standard	result 1	date 2025-08-15	rnd 2	type Standard	result 1
		Opponent Nkwansi, T (Tyra)				Opponent Nkwansi, T (Tyra)

#	Games	Start				End
1	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 Du Bruyn, J (Juan)				Opponent Koenig, L (Liam)

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 ,L (Lience)	2	1	0	0	0	0	2	1	0	0	0	0
1	Rossouw ,L (Lience)	2	1432.1	1432.1	0	0	0	2	1326	1432.1	0	0	0
2	Koenig ,L (Liam)	2	2	425	0	0	0	2	2	425	0	0	0
2	Koenig ,L (Liam)	2	1200	1625	0	0	0	2	1200	1625	0	0	0
3	Du Bruyn ,J (Juan)	2	2	425	0	0	0	2	2	425	0	0	0
3	Du Bruyn ,J (Juan)	2	1209.3	1634.3	0	0	0	2	1200	1634.3	0	0	0
4	Erwee ,HP (Hermanus Philipus)	1	1	425	1	1	425	0	0	0	0	0	0
4	Erwee ,HP (Hermanus Philipus)	1	1292.7	1717.7	1	1283.4	1717.7	0	0	0	0	0	0
5	Nkwansi ,T (Tyra)	1	1	425	1	1	425	0	0	0	0	0	0
5	Nkwansi ,T (Tyra)	1	1200	1625	1	1200	1625	0	0	0	0	0	0
6	Vounatsos ,L (Levi)	1	0.5	0	1	0.5	0	0	0	0	0	0	0
6	Vounatsos ,L (Levi)	1	1281.4	1281.4	1	1282.1	1281.4	0	0	0	0	0	0
7	Van Der Merwe ,ZC (Zander Christiaan)	1	0	-425	1	0	-425	0	0	0	0	0	0
7	Van Der Merwe ,ZC (Zander Christiaan)	1	1507.1	1082.1	1	1501.3	1082.1	0	0	0	0	0	0
8	Mothee ,A (Aric)	1	0	-425	1	0	-425	0	0	0	0	0	0
8	Mothee ,A (Aric)	1	1409.2	984.2	1	1402	984.2	0	0	0	0	0	0
9	De Beer ,L (Liam Nicolaas)	1	0	-425	1	0	-425	0	0	0	0	0	0
9	De Beer ,L (Liam Nicolaas)	1	1501.1	1076.1	1	1497.3	1076.1	0	0	0	0	0	0
10	Wessels ,J (Jancko)	1	1	425	1	1	425	0	0	0	0	0	0
10	Wessels ,J (Jancko)	1	1222.3	1647.3	1	1227.4	1647.3	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

Pretorius, J (Johnro)

Ratings

Game statistics

Rankings

Historical performance

Last 24 raw ratings

Rating graph

Tournaments

Top 3 Streaks

Top 10 opponents most often played

Norms