Chess South Africa Ratings Database

PLAYER PAGE

Personal

Krog, J (Juhann)

Chess SA id

108086552

FIDE id

Date of birth

2008-01-08 (U18)

Gender

Male

Region

Bojanala Platina (NBR)

Citizen

RSA

Titles

Chess SA registered

Last active game

2025-08-02

Personal details last changed

1900-01-01

Junior GPX Games

Junior GPX Points

Item	Main	Standard	Rapid	Blitz
Rating	1336.4	1235.4	1091.8	622.8
Raw rating	1336.4	1235.4	1091.8	622.8
Weighted rating	1312	1235.4	999.5	622.8
Weighted performance	1130.2	588.6	1002.2	0
Floor	836.4	748	591.8	500
K-factor	36	36	40	40
Min/Max rating change allowed	136.5	157.7	193.5	377.4
Highest rating	1336.4 2025-09-01	1260.8 2020-01-01	1200 2018-02-01	1200 2024-02-01
Highest raw rating	1336.4 2025-09-01	1248 2020-02-01	1091.8 2025-09-01	622.8 2024-02-01
Highest weighted rating	1306.3 2025-09-01	1248 2024-07-01	990.4 2024-11-01	622.8 2024-11-01
Highest weighted performance	1272.4 2020-01-01	1260.8 2020-01-01	1200 2018-02-01	1200 2024-02-01

Prediction
Item	Main	Standard	Rapid	Blitz
Rating change	0	0	0	0
New rating	1336.4	1235.4	1091.8	622.8
Analysis
Rating	1336.4	1235.4	1091.8	622.8
Raw rating	1336.4	1235.4	1091.8	622.8
Weighted rating	1312	1235.4	999.5
Weighted performance	1130.2	588.6	1002.2
K-factor	36	36	40	40
Floor	836.4	748	591.8	500
Max/Min rating change allowed	136.5	157.7	193.5	377.4
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	1336.4	1235.4	1091.8	622.8
New weighted rating	1314.6	1235.4	1009.7	622.8
New weighted performance	1122.2	581.3	994.5	0
Temp new rating	1336.4	1235.4	1091.8	622.8
Temp new rating +/-	0	0	0	0
Final new rating +/-	0	0	0	0
New rating	1336.4	1235.4	1091.8	622.8
New K-factor	36	36	40	40
New floor	836.4	748	591.8	500

Item	Main	Standard	Rapid
	0	0	0
	5	0	5
	5	0	5
	5	0	5
	10	10	0
	0	0	0
History	178	148	30

Games since
	Main 10	Standard 0		Rapid 10		Blitz 0
Gender	Male
Age group	U18
Region	Bojanala Platina (NBR)
Province	Northwest (NW)
Main
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
U18	-1		-1		-1
U18 Male	-1		-1		-1
Standard
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
U18	-1		-1		-1
U18 Male	-1		-1		-1
Rapid
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
U18	-1		-1		-1
U18 Male	-1		-1		-1
Blitz
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
U18	-1		-1		-1
U18 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	5	4	80	255	1248.7	1503.7
Standard	0	0	0	0	0	0
Rapid	5	4	80	255	1248.7	1503.7
Blitz	0	0	0	0	0	0
History
	Games	Score	%	Dp	AvgOpp	Performance
Main	133	81.5	61.28	95.9	1041.2	1137
Standard	108	65	60.19	86.6	1006.4	1093
Rapid	25	16.5	66	136	1191.4	1327.4
Blitz	0	0	0	0	0	0

Date	Main	Standard	Rapid	Blitz
2025-11-01	1336.4	1235.4	1091.8	622.8
2025-09-30	1336.4	1235.4	1091.8	622.8
2025-09-01	1336.4	1235.4	1091.8	622.8
2025-08-01	1308.4	1235.4	990.4	622.8
2025-07-01	1308.4	1235.4	990.4	622.8
2025-06-01	1308.4	1235.4	990.4	622.8
2025-05-01	1308.4	1235.4	990.4	622.8
2025-04-01	1308.4	1235.4	990.4	622.8
2025-03-01	1308.4	1235.4	990.4	622.8
2025-02-01	1308.4	1235.4	990.4	622.8
2025-01-01	1308.4	1235.4	990.4	622.8
2024-12-01	1308.4	1235.4	990.4	622.8
2024-11-01	1308.4	1235.4	990.4	622.8
2024-10-01	1308.4	1235.4	990.4	622.8
2024-09-01	1308.4	1235.4	990.4	622.8
2024-08-01	1308.4	1235.4	990.4	622.8
2024-07-01	1284.9	1235.4	871.6	622.8
2024-09-01	1284.9	1235.4	871.6	622.8
2024-05-01	1284.9	1235.4	871.6	622.8
2024-04-01	1284.9	1235.4	871.6	622.8
2024-03-01	1284.9	1235.4	871.6	622.8
2024-02-01	1284.9	1235.4	871.6	622.8
2024-01-01	1284.9	1235.4	871.6	622.8
2023-12-01	1284.9	1235.4	871.6	622.8

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	Bojanala's Clash Of Schools 2025 (U17+B-Juniors)	2025-08-02	2025-08-02	Rapid	Bojanala Platina (NBR)	5	5	4	Yes	Analysis

Last 500 tournaments since 01 January 2018

#	Tournament	Start	End	Type	Host	Rounds	Games	Score	Cfr	Analysis
1	Bojanala's Clash Of Schools 2025 (U17+B-Juniors)	2025-08-02	2025-08-02	Rapid	Bojanala Platina (NBR)	5	5	4	Yes	Analysis
2	Bojanala's Clash Of Schools - Secondary 2024 (U17)	2024-07-27	2024-07-27	Rapid	Bojanala Platina (NBR)	5	5	3.5	Yes	Analysis
3	Bojanala School League 2023 (U15)	2023-08-19	2023-08-19	Rapid	Bojanala Platina (NBR)	5	5	4	Yes	Analysis
4	Bojanala Chess Federation Clash of Schools 2022 (Prestige)	2022-07-22	2022-07-22	Standard	Bojanala Platina (NBR)	5	5	1.5	Yes	Analysis
5	2nd One For The Ages 2022 (U16)	2022-07-30	2022-07-30	Standard	Bojanala Platina (NBR)	5	5	3	Yes	Analysis
6	Laerskool Proteapark 2020 (B)	2020-02-29	2020-02-29	Standard	Bojanala Platina (NBR)	5	5	2	Yes	Analysis
7	2019 South African Junior Team Championships (U12B)	2020-01-04	2020-01-08	Standard	4 Knights (4K)	7	7	4	Yes	Analysis
8	NW Open 2019 (B)	2019-10-12	2019-10-12	Standard	Bojanala Platina (NBR)	5	3	1	Yes	Analysis
9	Inter Region 2019 (U12 Open)	2019-10-19	2019-10-19	Standard	Bojanala Platina (NBR)	5	4	3	Yes	Analysis
10	Laerskool Brits 2019 (U12)	2019-08-31	2019-08-31	Standard	Bojanala Platina (NBR)	5	5	4	Yes	Analysis
11	2019 Super 12 Laerskole (Seniors)	2019-05-04	2019-05-04	Rapid	Tshwane (GTP)	5	5	4	Yes	Analysis
12	Inter Regional Chess Championship 2019 (U12)	2019-05-10	2019-05-11	Standard	Mangaung (FMB)	5	5	3	Yes	Analysis
13	Rustenburg Noord Primary Tournament 2019 (U12)	2019-02-09	2019-02-09	Standard	Bojanala Platina (NBR)	5	5	5	Yes	Analysis
14	Laerskool Vastrap Tournament 2019 (B)	2019-02-23	2019-02-23	Standard	Bojanala Platina (NBR)	5	5	2	Yes	Analysis
15	Fields College Open 2019 (U12)	2019-02-02	2019-02-02	Standard	Bojanala Platina (NBR)	5	5	3.5	Yes	Analysis
16	South African Junior Team Championships 2018 (U12C)	2018-12-16	2018-12-20	Standard	4 Knights (4K)	7	7	2	Yes	Analysis
17	Lebone II Chess 2018 (U12)	2018-09-01	2018-09-01	Standard	Cape Town (WCT)	5	5	4	Yes	Analysis
18	Bojanala Regionals 2018 (U12)	2018-09-15	2018-09-15	Standard	Bojanala Platina (NBR)	5	5	3	Yes	Analysis
19	Boys and Girls 2018 (U12 Boys)	2018-08-25	2018-08-25	Standard	Dr Kenneth Kaunda (NWP)	5	5	3.5	Yes	Analysis
20	Laerskool Brits Tournament 2018 (U12)	2018-08-04	2018-08-04	Standard	Bojanala Platina (NBR)	5	5	4	Yes	Analysis
21	Ho�rskool Frikkie Meyer 2018 (C)	2018-07-21	2018-07-21	Standard	Bojanala Platina (NBR)	5	5	4	Yes	Analysis
22	2018 Super 12 (Junior)	2018-05-05	2018-05-05	Rapid	Tshwane (GTP)	5	5	1	Yes	Analysis
23	Laerskool Rustenburg 2018 (D)	2018-03-24	2018-03-24	Standard	Bojanala Platina (NBR)	5	5	3.5	Yes	Analysis
24	Hoerskool Brits 2018 (U12)	2018-03-17	2018-03-17	Standard	Bojanala Platina (NBR)	5	5	2	Yes	Analysis
25	Laerskool Vastrap 2018 (U12)	2018-02-03	2018-02-03	Standard	Bojanala Platina (NBR)	5	5	2	Yes	Analysis
26	South African Junior Team Championships 2017 (U10D)	2018-01-04	2018-01-08	Standard	4 Knights (4K)	7	7	5	Yes	Analysis

#	Games	Start				End
1	7	Tournament Fields College Open 2019				Tournament Rustenburg Noord Primary Tournament 2019
		date 2019-02-02	rnd 4	type Standard	result 1	date 2019-02-09	rnd 5	type Standard	result 1
		Opponent Sera, G (Galaletsang)				Opponent Morake, O (Orefile)
2	5	Tournament Inter Regional Chess Championship 2019				Tournament Laerskool Brits 2019
		date 2019-05-11	rnd 5	type Standard	result 1	date 2019-08-31	rnd 4	type Standard	result 1
		Opponent Lemphane, O (Oratile)				Opponent Morake, O (Orefile)
3	5	Tournament 2019 Super 12 Laerskole				Tournament Inter Regional Chess Championship 2019
		date 2019-05-04	rnd 3	type Rapid	result 1	date 2019-05-10	rnd 2	type Standard	result 1
		Opponent Le Roux, M (Markus)				Opponent Plaatjies, T (Tshiamo)

#	Games	Start				End
1	7	Tournament Fields College Open 2019				Tournament Rustenburg Noord Primary Tournament 2019
		date 2019-02-02	rnd 4	type Standard	result 1	date 2019-02-09	rnd 5	type Standard	result 1
		Opponent Sera, G (Galaletsang)				Opponent Morake, O (Orefile)
2	6	Tournament Laerskool Rustenburg 2018				Tournament Ho�rskool Frikkie Meyer 2018
		date 2018-03-24	rnd 4	type Standard	result 1	date 2018-07-21	rnd 4	type Standard	result 1
		Opponent Van Der Schyff, K (Kevin)				Opponent Lelaka, SK (Sechaba)
3	5	Tournament Inter Regional Chess Championship 2019				Tournament Laerskool Brits 2019
		date 2019-05-11	rnd 5	type Standard	result 1	date 2019-08-31	rnd 4	type Standard	result 1
		Opponent Lemphane, O (Oratile)				Opponent Morake, O (Orefile)

#	Games	Start				End
1	6	Tournament 2019 Super 12 Laerskole				Tournament Bojanala School League 2023
		date 2019-05-04	rnd 3	type Rapid	result 1	date 2023-08-19	rnd 3	type Rapid	result 1
		Opponent Le Roux, M (Markus)				Opponent Mholo, O (Omolemo)
2	4	Tournament Bojanala's Clash Of Schools - Secondary 2024				Tournament Bojanala's Clash Of Schools 2025
		date 2024-07-27	rnd 5	type Rapid	result 1	date 2025-08-02	rnd 3	type Rapid	result 1
		Opponent Phadi, T (Teboho)				Opponent Sehunwe, L (Lethlogonolo)
3	4	Tournament Bojanala School League 2023				Tournament Bojanala's Clash Of Schools - Secondary 2024
		date 2023-08-19	rnd 5	type Rapid	result 1	date 2024-07-27	rnd 3	type Rapid	result 1
		Opponent Chaibva, V (Vivian)				Opponent Dlamini, M (Mofo)

No games found.

#	Games	Start				End

#	Games	Start				End
1	5	Tournament Inter Regional Chess Championship 2019				Tournament Laerskool Brits 2019
		date 2019-05-11	rnd 5	type Standard	result 1	date 2019-08-31	rnd 4	type Standard	result 1
		Opponent Lemphane, O (Oratile)				Opponent Morake, O (Orefile)
2	5	Tournament 2019 Super 12 Laerskole				Tournament Inter Regional Chess Championship 2019
		date 2019-05-04	rnd 3	type Rapid	result 1	date 2019-05-10	rnd 2	type Standard	result 1
		Opponent Le Roux, M (Markus)				Opponent Plaatjies, T (Tshiamo)
3	5	Tournament Rustenburg Noord Primary Tournament 2019				Tournament Rustenburg Noord Primary Tournament 2019
		date 2019-02-09	rnd 1	type Standard	result 1	date 2019-02-09	rnd 5	type Standard	result 1
		Opponent Kleynhans, EH (Eldrich)				Opponent Morake, O (Orefile)

#	Games	Start				End
1	6	Tournament Laerskool Rustenburg 2018				Tournament Ho�rskool Frikkie Meyer 2018
		date 2018-03-24	rnd 4	type Standard	result 1	date 2018-07-21	rnd 4	type Standard	result 1
		Opponent Van Der Schyff, K (Kevin)				Opponent Lelaka, SK (Sechaba)
2	5	Tournament Inter Regional Chess Championship 2019				Tournament Laerskool Brits 2019
		date 2019-05-11	rnd 5	type Standard	result 1	date 2019-08-31	rnd 4	type Standard	result 1
		Opponent Lemphane, O (Oratile)				Opponent Morake, O (Orefile)
3	5	Tournament Rustenburg Noord Primary Tournament 2019				Tournament Rustenburg Noord Primary Tournament 2019
		date 2019-02-09	rnd 1	type Standard	result 1	date 2019-02-09	rnd 5	type Standard	result 1
		Opponent Kleynhans, EH (Eldrich)				Opponent Morake, O (Orefile)

#	Games	Start				End
1	6	Tournament 2019 Super 12 Laerskole				Tournament Bojanala School League 2023
		date 2019-05-04	rnd 3	type Rapid	result 1	date 2023-08-19	rnd 3	type Rapid	result 1
		Opponent Le Roux, M (Markus)				Opponent Mholo, O (Omolemo)
2	4	Tournament Bojanala's Clash Of Schools - Secondary 2024				Tournament Bojanala's Clash Of Schools 2025
		date 2024-07-27	rnd 5	type Rapid	result 1	date 2025-08-02	rnd 3	type Rapid	result 1
		Opponent Phadi, T (Teboho)				Opponent Sehunwe, L (Lethlogonolo)
3	2	Tournament Bojanala School League 2023				Tournament Bojanala's Clash Of Schools - Secondary 2024
		date 2023-08-19	rnd 5	type Rapid	result 1	date 2024-07-27	rnd 1	type Rapid	result 1
		Opponent Chaibva, V (Vivian)				Opponent Rasepae, O (Obakeng)

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	Molefinyane ,O (Otlotleng)	4	4	425	4	4	425	0	0	0	0	0	0
1	Molefinyane ,O (Otlotleng)	4	832.3	1257.3	4	818.2	1257.3	0	0	0	0	0	0
2	Difotso ,LR (Lebogang Rotondwa)	4	1	-212.5	4	1	-212.5	0	0	0	0	0	0
2	Difotso ,LR (Lebogang Rotondwa)	4	1341.9	1129.4	4	1330.8	1129.4	0	0	0	0	0	0
3	Jansen ,D (Danel)	3	2	141.7	3	2	141.7	0	0	0	0	0	0
3	Jansen ,D (Danel)	3	1036.1	1177.7	3	1021.8	1177.7	0	0	0	0	0	0
4	Marx ,HB (Heinrich Butow)	2	1	0	2	1	0	0	0	0	0	0	0
4	Marx ,HB (Heinrich Butow)	2	783.9	783.9	2	790.7	783.9	0	0	0	0	0	0
5	Van Zyl ,M (Mischka)	2	0	-425	2	0	-425	0	0	0	0	0	0
5	Van Zyl ,M (Mischka)	2	821.3	396.3	2	776.3	396.3	0	0	0	0	0	0
6	Goliath ,BB (Brimarion Brushane)	2	0	-425	2	0	-425	0	0	0	0	0	0
6	Goliath ,BB (Brimarion Brushane)	2	1333.5	908.5	2	1339.9	908.5	0	0	0	0	0	0
7	Byliefeldt ,L (Leroux)	2	1	0	2	1	0	0	0	0	0	0	0
7	Byliefeldt ,L (Leroux)	2	1092.6	1092.6	2	1078.4	1092.6	0	0	0	0	0	0
8	De Klerk ,AJ (Abraham Jacobus)	2	1	0	2	1	0	0	0	0	0	0	0
8	De Klerk ,AJ (Abraham Jacobus)	2	887.1	887.1	2	870.7	887.1	0	0	0	0	0	0
9	Smit ,D (Dian)	2	0	-425	2	0	-425	0	0	0	0	0	0
9	Smit ,D (Dian)	2	813	388	2	803.5	388	0	0	0	0	0	0
10	Mulder ,SL (Stephanus)	2	1.5	212.5	2	1.5	212.5	0	0	0	0	0	0
10	Mulder ,SL (Stephanus)	2	984.7	1197.2	2	973.5	1197.2	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

Krog, J (Juhann)

Ratings

Game statistics

Rankings

Historical performance

Last 24 raw ratings

Rating graph

Tournaments

Top 3 Streaks

Top 10 opponents most often played

Norms