Chess South Africa Ratings Database

PLAYER PAGE

Personal

Grobler, DDI (Donovan Denzel Izak)

Chess SA id

109095323

FIDE id

Date of birth

2009-12-13 (U18)

Gender

Male

Region

Tshwane (GTP)

Citizen

RSA

Titles

Chess SA registered

Last active game

2025-10-18

Personal details last changed

1900-01-01

Junior GPX Games

Junior GPX Points

1494.8

Item	Main	Standard	Rapid	Blitz
Rating	1408.6	1401.7	1200	1047.2
Raw rating	1362.8	1371.3	1200	1047.2
Weighted rating	1267.5	1265.6	1200	1047.2
Weighted performance	1408.6	1401.7	0	0
Floor	862.8	871.3	700	700
K-factor	36	36	36	36
Min/Max rating change allowed	131.5	129.9	165.8	206.1
Highest rating	1408.6 2025-11-01	1401.7 2025-11-01	1200 2018-10-01	1200 2018-10-01
Highest raw rating	1362.8 2025-11-01	1371.3 2025-11-01	1200 2024-02-01	1200 2018-02-01
Highest weighted rating	1285.2 2022-01-01	1281.6 2022-01-01	1200 2018-10-01	1200 2018-10-01
Highest weighted performance	1408.6 2025-11-01	1401.7 2025-11-01	1200 2024-02-01	1200 2018-02-01

Prediction
Item	Main	Standard	Rapid	Blitz
Rating change	-8.5	-8.5	0	0
New rating	1400.1	1393.3	1200	1047.2
Analysis
Rating	1408.6	1401.7	1200	1047.2
Raw rating	1362.8	1371.3	1200	1047.2
Weighted rating	1267.5	1265.6	1200
Weighted performance	1408.6	1401.7	0
K-factor	36	36	36	36
Floor	862.8	871.3	700	700
Max/Min rating change allowed	131.5	129.9	165.8	206.1
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	1362.8	1371.3	1200	1047.2
New weighted rating	1276.6	1275.7	1200	1047.2
New weighted performance	1400.1	1393.3	0	0
Temp new rating	1400.1	1393.3	1200	1047.2
Temp new rating +/-	-8.5	-8.5	0	0
Final new rating +/-	-8.5	-8.5	0	0
New rating	1400.1	1393.3	1200	1047.2
New K-factor	36	36	36	36
New floor	862.8	871.3	700	700

Item	Main	Standard	Blitz
	0	0	0
	20	20	0
	5	5	0
	22	22	0
	30	30	0
	27	27	0
History	190	180	10

Games since
	Main 25	Standard 25		Rapid 0		Blitz 0
Gender	Male
Age group	U18
Region	Tshwane (GTP)
Province	Gauteng (GT)
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	20	14	70	170	1314.9	1484.9
Standard	20	14	70	170	1314.9	1484.9
Rapid	0	0	0	0	0	0
Blitz	0	0	0	0	0	0
History
	Games	Score	%	Dp	AvgOpp	Performance
Main	185	94	50.81	6.9	1219.6	1226.5
Standard	175	91	52	17	1215.1	1232.1
Rapid	0	0	0	0	0	0
Blitz	10	3	30	-170	1299.2	1129.2

Date	Main	Standard	Rapid	Blitz
2025-11-01	1362.8	1371.3	1200	1047.2
2025-09-30	1334.4	1345.4	1200	1047.2
2025-09-01	1334.4	1345.4	1200	1047.2
2025-08-01	1270.9	1268.7	1200	1047.2
2025-07-01	1270.9	1268.7	1200	1047.2
2025-06-01	1270.9	1268.7	1200	1047.2
2025-05-01	1270.9	1268.7	1200	1047.2
2025-04-01	1270.9	1268.7	1200	1047.2
2025-03-01	1270.9	1268.7	1200	1047.2
2025-02-01	1219.7	1210.8	1200	1047.2
2025-01-01	1219.7	1210.8	1200	1047.2
2024-12-01	1219.7	1210.8	1200	1047.2
2024-11-01	1219.7	1210.8	1200	1047.2
2024-10-01	1219.7	1210.8	1200	1047.2
2024-09-01	1219.7	1210.8	1200	1047.2
2024-08-01	1219.7	1210.8	1200	1047.2
2024-07-01	1219.7	1210.8	1200	1047.2
2024-09-01	1219.7	1210.8	1200	1047.2
2024-05-01	1219.7	1210.8	1200	1047.2
2024-04-01	1219.7	1210.8	1200	1047.2
2024-03-01	1219.7	1210.8	1200	1047.2
2024-02-01	1229.3	1226.3	1200	1047.2
2024-01-01	1229.3	1226.3	1200	1047.2
2023-12-01	1229.3	1226.3	1200	1047.2

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 Gauteng Top Schools Teams (U17)	2025-08-30	2025-08-30	Standard	Tshwane (GTP)	5	5	1.5	Yes	Analysis
2	Paarl Boys' High School Chess Festival 2025 (B)	2025-10-17	2025-10-18	Standard	Cape Winelands (WCW)	6	6	4.5	Yes	Analysis
3	2025 Tshwane South School District CLOSED League Championship (U17A)	2025-08-16	2025-08-16	Standard	Tshwane (GTP)	5	4	4	Yes	Analysis
4	Grey College Team Championship 2025 (A)	2025-02-21	2025-02-22	Standard	Mangaung (FMB)	5	5	4	Yes	Analysis

Last 500 tournaments since 01 January 2018

#	Tournament	Start	End	Type	Host	Rounds	Games	Score	Cfr	Analysis
1	2025 Gauteng Top Schools Teams (U17)	2025-08-30	2025-08-30	Standard	Tshwane (GTP)	5	5	1.5	Yes	Analysis
2	Paarl Boys' High School Chess Festival 2025 (B)	2025-10-17	2025-10-18	Standard	Cape Winelands (WCW)	6	6	4.5	Yes	Analysis
3	2025 Tshwane South School District CLOSED League Championship (U17A)	2025-08-16	2025-08-16	Standard	Tshwane (GTP)	5	4	4	Yes	Analysis
4	Grey College Team Championship 2025 (A)	2025-02-21	2025-02-22	Standard	Mangaung (FMB)	5	5	4	Yes	Analysis
5	Grey College Team Championship 2024 (A)	2024-02-23	2024-02-24	Standard	Mangaung (FMB)	5	5	2	Yes	Analysis
6	Lardies Open Tournament 2023 (C)	2023-10-28	2023-10-28	Standard	Tshwane (GTP)	5	5	3	Yes	Analysis
7	2023 Gauteng Top Schools (U15 Mixed)	2023-08-19	2023-08-19	Standard	West Rand (GWR)	5	5	3	Yes	Analysis
8	2023 Tshwane South School District CLOSED League Championship (U15)	2023-07-29	2023-07-29	Standard	Tshwane (GTP)	3	3	1	Yes	Analysis
9	2023 Tshwane South School District CLOSED Individual Championships (U15 Open)	2023-04-22	2023-04-22	Standard	Tshwane (GTP)	5	5	1	Yes	Analysis
10	2023 Tshwane Chess Open Registration Tournament (B1)	2023-01-28	2023-01-28	Standard	Tshwane (GTP)	5	4	1	Yes	Analysis
11	Lardies Tournament 2022 (U14)	2022-10-29	2022-10-29	Standard	Tshwane (GTP)	5	5	3	Yes	Analysis
12	D4 Play Offs 2022 (U13)	2022-07-30	2022-07-30	Standard	Tshwane (GTP)	5	5	2	Yes	Analysis
13	2022 Blou Bul Open (C)	2022-06-25	2022-06-26	Standard	Tshwane (GTP)	5	5	2	Yes	Analysis
14	2022 Silver Lakes Chess Club Open Chess Tournament (C)	2022-05-14	2022-05-14	Standard	Tshwane (GTP)	5	5	2	Yes	Analysis
15	2022 Gauteng Interregion (U14 Open)	2022-02-26	2022-02-26	Standard	Tshwane (GTP)	5	5	2	Yes	Analysis
16	2022 Tshwane Chess Open Registration Tournament (C1)	2022-01-29	2022-01-29	Standard	Tshwane (GTP)	5	5	2	Yes	Analysis
17	2021 Lardies Ope (C)	2021-10-30	2021-10-30	Standard	Tshwane (GTP)	5	5	3	Yes	Analysis
18	2021 Etienne Lewis Closed Trials (U14 Open)	2021-09-24	2021-09-26	Standard	Nelson Mandela Bay (ENM)	7	7	3	Yes	Analysis
19	2021 Chris Greyling Open Tournament (C)	2021-05-08	2021-05-08	Standard	Tshwane (GTP)	5	5	3	Yes	Analysis
20	2021 Lubowski Open Tournament (C)	2021-05-01	2021-05-02	Standard	Tshwane (GTP)	5	5	3	Yes	Analysis
21	2021 Registration Tournament (C)	2021-03-13	2021-03-13	Standard	Tshwane (GTP)	5	5	3	Yes	Analysis
22	2020 Wynie Robbertse Open Chess Tournament (C)	2020-03-07	2020-03-07	Standard	Tshwane (GTP)	5	5	3	Yes	Analysis
23	2020 Waterkloof Open (C)	2020-02-29	2020-03-01	Standard	Tshwane (GTP)	5	5	3	Yes	Analysis
24	2020 Constantiapark Open Chess Tournament (C)	2020-02-08	2020-02-08	Standard	Tshwane (GTP)	5	5	1	Yes	Analysis
25	2020 Blou Bul (C)	2020-02-15	2020-02-15	Standard	Tshwane (GTP)	5	5	2	Yes	Analysis
26	2020 Registration Tournament (D)	2020-01-25	2020-01-25	Standard	Tshwane (GTP)	5	5	4	Yes	Analysis
27	2019 South African Juior Blitz Championship (B)	2020-01-05	2020-01-05	Blitz	4 Knights (4K)	7	4	0.5	Yes	Analysis
28	2019 South African Junior Team Championships (U12E)	2020-01-04	2020-01-08	Standard	4 Knights (4K)	7	7	5.5	Yes	Analysis
29	2019 TC SAJCC Prep Tournament (B)	2019-11-30	2019-11-30	Standard	Tshwane (GTP)	5	5	2	Yes	Analysis
30	2019 Lardies Open (D)	2019-10-26	2019-10-26	Standard	Tshwane (GTP)	5	5	4	Yes	Analysis
31	Waterkloof end of Year Blitz 2019	2019-10-17	2019-10-17	Blitz	Chess Excellence (CEX)	6	6	2.5	Yes	Analysis
32	2019 Etienne Lewis Trials (U12 Boys)	2019-08-30	2019-09-01	Standard	Tshwane (GTP)	7	7	3	Yes	Analysis
33	2019 Capablanca Chess Festival (Swiss D)	2019-04-19	2019-04-21	Standard	Tshwane (GTP)	7	7	4	Yes	Analysis
34	2019 Constantia Park Open (D)	2019-02-09	2019-02-09	Standard	Tshwane (GTP)	5	5	3	Yes	Analysis
35	2019 Tshwane Chess Registration Tournament (D)	2019-01-26	2019-01-26	Standard	Tshwane (GTP)	5	5	1.5	Yes	Analysis
36	2018 Lardies Ope (D)	2018-10-27	2018-10-27	Standard	Tshwane (GTP)	5	5	2	Yes	Analysis

#	Games	Start				End
1	7	Tournament 2019 South African Junior Team Championships				Tournament 2020 Registration Tournament
		date 2020-01-06	rnd 4	type Standard	result 1	date 2020-01-25	rnd 3	type Standard	result 1
		Opponent Kleyn, Z (Zonika)				Opponent Padayachy, S (Shreya)
2	6	Tournament Grey College Team Championship 2025				Tournament 2025 Tshwane South School District CLOSED League Championship
		date 2025-02-22	rnd 4	type Standard	result 1	date 2025-08-16	rnd 5	type Standard	result 1
		Opponent Herbst, D (Danielle)				Opponent Babedi, T (Tshepang)
3	5	Tournament 2020 Wynie Robbertse Open Chess Tournament				Tournament 2021 Registration Tournament
		date 2020-03-07	rnd 3	type Standard	result 0.5	date 2021-03-13	rnd 2	type Standard	result 1
		Opponent Makwela, T (Thato)				Opponent Strydom, L (Lucien)

#	Games	Start				End
1	9	Tournament 2019 South African Junior Team Championships				Tournament 2020 Registration Tournament
		date 2020-01-04	rnd 2	type Standard	result 1	date 2020-01-25	rnd 3	type Standard	result 1
		Opponent Mhambi, N (Nomsa)				Opponent Padayachy, S (Shreya)
2	6	Tournament Grey College Team Championship 2025				Tournament 2025 Tshwane South School District CLOSED League Championship
		date 2025-02-22	rnd 4	type Standard	result 1	date 2025-08-16	rnd 5	type Standard	result 1
		Opponent Herbst, D (Danielle)				Opponent Babedi, T (Tshepang)
3	5	Tournament 2020 Wynie Robbertse Open Chess Tournament				Tournament 2021 Registration Tournament
		date 2020-03-07	rnd 3	type Standard	result 0.5	date 2021-03-13	rnd 2	type Standard	result 1
		Opponent Makwela, T (Thato)				Opponent Strydom, L (Lucien)

No games found.

#	Games	Start				End

#	Games	Start				End
1	2	Tournament Waterkloof end of Year Blitz 2019				Tournament Waterkloof end of Year Blitz 2019
		date 2019-10-17	rnd 5	type Blitz	result 0.5	date 2019-10-17	rnd 6	type Blitz	result 1
		Opponent Anderson, S (Shane)				Opponent Eygelaar, L (Leila)
2	1	Tournament 2019 South African Juior Blitz Championship				Tournament 2019 South African Juior Blitz Championship
		date 2020-01-05	rnd 2	type Blitz	result 0.5	date 2020-01-05	rnd 2	type Blitz	result 0.5
		Opponent Prince, SN (Sharna)				Opponent Prince, SN (Sharna)
3	1	Tournament Waterkloof end of Year Blitz 2019				Tournament Waterkloof end of Year Blitz 2019
		date 2019-10-17	rnd 1	type Blitz	result 1	date 2019-10-17	rnd 1	type Blitz	result 1
		Opponent Vlok, J (Jan)				Opponent Vlok, J (Jan)

#	Games	Start				End
1	6	Tournament Grey College Team Championship 2025				Tournament 2025 Tshwane South School District CLOSED League Championship
		date 2025-02-22	rnd 4	type Standard	result 1	date 2025-08-16	rnd 5	type Standard	result 1
		Opponent Herbst, D (Danielle)				Opponent Babedi, T (Tshepang)
2	5	Tournament 2019 South African Junior Team Championships				Tournament 2020 Registration Tournament
		date 2020-01-07	rnd 6	type Standard	result 1	date 2020-01-25	rnd 3	type Standard	result 1
		Opponent Manafi, F (Fatima)				Opponent Padayachy, S (Shreya)
3	4	Tournament 2021 Lubowski Open Tournament				Tournament 2021 Chris Greyling Open Tournament
		date 2021-05-01	rnd 3	type Standard	result 1	date 2021-05-08	rnd 1	type Standard	result 1
		Opponent Matsioloko, G (Godisang)				Opponent O Rourke, R (Ronan)

#	Games	Start				End
1	6	Tournament Grey College Team Championship 2025				Tournament 2025 Tshwane South School District CLOSED League Championship
		date 2025-02-22	rnd 4	type Standard	result 1	date 2025-08-16	rnd 5	type Standard	result 1
		Opponent Herbst, D (Danielle)				Opponent Babedi, T (Tshepang)
2	5	Tournament 2019 South African Junior Team Championships				Tournament 2020 Registration Tournament
		date 2020-01-07	rnd 6	type Standard	result 1	date 2020-01-25	rnd 3	type Standard	result 1
		Opponent Manafi, F (Fatima)				Opponent Padayachy, S (Shreya)
3	4	Tournament 2021 Lubowski Open Tournament				Tournament 2021 Chris Greyling Open Tournament
		date 2021-05-01	rnd 3	type Standard	result 1	date 2021-05-08	rnd 1	type Standard	result 1
		Opponent Matsioloko, G (Godisang)				Opponent O Rourke, R (Ronan)

No games found.

#	Games	Start				End

#	Games	Start				End
1	1	Tournament Waterkloof end of Year Blitz 2019				Tournament Waterkloof end of Year Blitz 2019
		date 2019-10-17	rnd 6	type Blitz	result 1	date 2019-10-17	rnd 6	type Blitz	result 1
		Opponent Eygelaar, L (Leila)				Opponent Eygelaar, L (Leila)
2	1	Tournament Waterkloof end of Year Blitz 2019				Tournament Waterkloof end of Year Blitz 2019
		date 2019-10-17	rnd 1	type Blitz	result 1	date 2019-10-17	rnd 1	type Blitz	result 1
		Opponent Vlok, J (Jan)				Opponent Vlok, J (Jan)

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	Van Deventer ,NS (Nathaniel Steven)	4	1	-212.5	4	1	-212.5	0	0	0	0	0	0
1	Van Deventer ,NS (Nathaniel Steven)	4	1193.8	981.2	4	1175.8	981.2	0	0	0	0	0	0
2	O Rourke ,R (Ronan)	3	3	425	3	3	425	0	0	0	0	0	0
2	O Rourke ,R (Ronan)	3	1143.2	1568.2	3	1138.2	1568.2	0	0	0	0	0	0
3	Yang ,A (Alex)	3	0	-425	3	0	-425	0	0	0	0	0	0
3	Yang ,A (Alex)	3	1527.9	1102.9	3	1520.7	1102.9	0	0	0	0	0	0
4	Mokoena ,GP (Gonase Promise)	3	2	141.7	3	2	141.7	0	0	0	0	0	0
4	Mokoena ,GP (Gonase Promise)	3	1279.3	1421	3	1275.2	1421	0	0	0	0	0	0
5	Webb ,K (Kagan)	3	2	141.7	3	2	141.7	0	0	0	0	0	0
5	Webb ,K (Kagan)	3	1231.6	1373.3	3	1230.1	1373.3	0	0	0	0	0	0
6	Bhudai ,A (Arman)	3	0	-425	3	0	-425	0	0	0	0	0	0
6	Bhudai ,A (Arman)	3	1232.8	807.8	3	1232.8	807.8	0	0	0	0	0	0
7	Matsiokolo ,G (Godisang)	2	1	0	2	1	0	0	0	0	0	0	0
7	Matsiokolo ,G (Godisang)	2	1154.2	1154.2	2	1143.8	1154.2	0	0	0	0	0	0
8	Mungal ,Z (Zoey)	2	1	0	2	1	0	0	0	0	0	0	0
8	Mungal ,Z (Zoey)	2	1376.7	1376.7	2	1359.4	1376.7	0	0	0	0	0	0
9	Beukes ,A (Anton)	2	1.5	212.5	2	1.5	212.5	0	0	0	0	0	0
9	Beukes ,A (Anton)	2	933.9	1146.4	2	950.2	1146.4	0	0	0	0	0	0
10	Bogaard ,FK (Franco Konrad)	2	0	-425	2	0	-425	0	0	0	0	0	0
10	Bogaard ,FK (Franco Konrad)	2	1299.4	874.4	2	1286.4	874.4	0	0	0	0	0	0

Norms

No norms achieved.

#	Norm	Tournament	Start	End	Rounds	Games	Score	Details

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Personal

Grobler, DDI (Donovan Denzel Izak)

Ratings

Game statistics

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Historical performance

Last 24 raw ratings

Rating graph

Tournaments

Top 3 Streaks

Top 10 opponents most often played

Norms