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

Item	Main	Standard	Rapid	Blitz
Rating	1271.2	1235.9	1268.8	1200
Raw rating	1271.2	1235.9	1268.8	1200
Weighted rating	1233.2	1217.2	1229.3	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	1233.2	1217.2	1229.3
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	1237.7	1219.2	1233.9	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
2026-01-01	1271.2	1235.9	1268.8	1200
2025-11-30	1271.2	1235.9	1268.8	1200
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
2024-11-01	1189	1200	1181.6	1200
2024-07-01	1189	1200	1181.6	1200
2024-06-01	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

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	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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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