Chess South Africa Ratings Database

PLAYER PAGE

Personal

Koen, A (Alonzo)

Chess SA id

1120149898

FIDE id

Date of birth

2012-10-14 (U14)

Gender

Male

Region

Eden (WEG)

Citizen

RSA

Titles

Chess SA registered

Last active game

2025-08-16

Personal details last changed

1900-01-01

Junior GPX Games

Junior GPX Points

Item	Main	Standard	Rapid	Blitz
Rating	1172.6	1163.4	1200	1200
Raw rating	1166.2	1156.1	1200	1200
Weighted rating	1172.6	1163.4	1200	1200
Weighted performance	0	0	0	0
Floor	749.6	758.4	700	700
K-factor	36	36	36	36
Min/Max rating change allowed	174	176.5	165.8	165.8
Highest rating	1456.5 2023-02-01	1456.5 2023-02-01	1200 2018-10-01	1200 2018-10-01
Highest raw rating	1249.6 2023-03-01	1258.4 2023-03-01	1200 2024-03-01	1200 2024-03-01
Highest weighted rating	1249.6 2024-03-01	1258.4 2024-03-01	1200 2018-10-01	1200 2018-10-01
Highest weighted performance	1456.5 2023-02-01	1456.5 2023-02-01	1200 2024-03-01	1200 2024-03-01

Prediction
Item	Main	Standard	Rapid	Blitz
Rating change	-1.1	-1.3	0	0
New rating	1171.5	1162	1200	1200
Analysis
Rating	1172.6	1163.4	1200	1200
Raw rating	1166.2	1156.1	1200	1200
Weighted rating	1172.6	1163.4	1200
Weighted performance	0	0	0
K-factor	36	36	36	36
Floor	749.6	758.4	700	700
Max/Min rating change allowed	174	176.5	165.8	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	1166.2	1156.1	1200	1200
New weighted rating	1171.5	1162	1200	1200
New weighted performance	0	0	0	0
Temp new rating	1171.5	1162	1200	1200
Temp new rating +/-	-1.1	-1.3	0	0
Final new rating +/-	-1.1	-1.3	0	0
New rating	1171.5	1162	1200	1200
New K-factor	36	36	36	36
New floor	749.6	758.4	700	700

Item	Main	Standard
	0	0
	2	2
	9	9
	9	9
	0	0
	0	0
History	20	20

Games since
	Main 11	Standard 11		Rapid 0		Blitz 0
Gender	Male
Age group	U14
Region	Eden (WEG)
Province	Western Cape (WC)
Main
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
U14	-1		-1		-1
U14 Male	-1		-1		-1
Standard
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
U14	-1		-1		-1
U14 Male	-1		-1		-1
Rapid
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
U14	-1		-1		-1
U14 Male	-1		-1		-1
Blitz
	RSA		Province		Region
Overall	-1		-1		-1
Male	-1		-1		-1
U14	-1		-1		-1
U14 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	2	0	0	-425	1347.2	922.2
Standard	2	0	0	-425	1347.2	922.2
Rapid	0	0	0	0	0	0
Blitz	0	0	0	0	0	0
History
	Games	Score	%	Dp	AvgOpp	Performance
Main	20	6	30	-170	1265.2	1095.2
Standard	20	6	30	-170	1265.2	1095.2
Rapid	0	0	0	0	0	0
Blitz	0	0	0	0	0	0

Date	Main	Standard	Rapid	Blitz
2025-11-01	1166.2	1156.1	1200	1200
2025-09-30	1166.2	1156.1	1200	1200
2025-09-01	1166.2	1156.1	1200	1200
2025-08-01	1182.1	1174.7	1200	1200
2025-07-01	1182.1	1174.7	1200	1200
2025-06-01	1182.1	1174.7	1200	1200
2025-05-01	1182.1	1174.7	1200	1200
2025-04-01	1182.1	1174.7	1200	1200
2025-03-01	1182.1	1174.7	1200	1200
2025-02-01	1180.8	1173.2	1200	1200
2025-01-01	1142	1126.6	1200	1200
2024-12-01	1142	1126.6	1200	1200
2024-11-01	1142	1126.6	1200	1200
2024-10-01	1142	1126.6	1200	1200
2024-09-01	1142	1126.6	1200	1200
2024-08-01	1189.2	1182.8	1200	1200
2024-07-01	1189.2	1182.8	1200	1200
2024-09-01	1189.2	1182.8	1200	1200
2024-05-01	1189.2	1182.8	1200	1200
2024-04-01	1189.2	1182.8	1200	1200
2024-03-01	1224.2	1225.3	1200	1200
2024-02-01	1224.2	1225.3	1200	1200
2024-01-01	1224.2	1225.3	1200	1200
2023-12-01	1224.2	1225.3	1200	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	Eden Top Schools 2025 (U13)	2025-08-16	2025-08-16	Standard	Eden (WEG)	5	2	0	Yes	Analysis
2	Eden Chess Trials 2 2025 (U14)	2025-03-15	2025-04-12	Standard	Eden (WEG)	10	0	0	No	Analysis

Last 500 tournaments since 01 January 2018

#	Tournament	Start	End	Type	Host	Rounds	Games	Score	Cfr	Analysis
1	Eden Top Schools 2025 (U13)	2025-08-16	2025-08-16	Standard	Eden (WEG)	5	2	0	Yes	Analysis
2	Eden Chess Trials 2 2025 (U14)	2025-03-15	2025-04-12	Standard	Eden (WEG)	10	0	0	No	Analysis
3	Eden Top Schools 2024 (U15 Open)	2024-08-17	2024-08-17	Standard	Eden (WEG)	5	4	0	Yes	Analysis
4	Eden School Chess Trials 1 2024 (U13 Boys)	2024-03-09	2024-03-09	Standard	Eden (WEG)	5	5	1	Yes	Analysis
5	Eden Top Schools 2023 (U11 Mix)	2023-08-19	2023-08-19	Standard	Eden (WEG)	5	4	1	Yes	Analysis
6	Eden Trials 2+3 2023 (U12)	2023-04-15	2023-05-13	Standard	Eden (WEG)	10	0	0	No	Analysis
7	2023 Knysna School Trials #1 (U7-U11)	2023-02-04	2023-02-04	Standard	Eden (WEG)	5	5	4	Yes	Analysis

#	Games	Start				End
1	4	Tournament 2023 Knysna School Trials #1				Tournament 2023 Knysna School Trials #1
		date 2023-02-04	rnd 2	type Standard	result 1	date 2023-02-04	rnd 5	type Standard	result 1
		Opponent Dayimani, S (Simphe)				Opponent Bondt, J (Jamile)
2	1	Tournament Eden School Chess Trials 1 2024				Tournament Eden School Chess Trials 1 2024
		date 2024-03-09	rnd 3	type Standard	result 1	date 2024-03-09	rnd 3	type Standard	result 1
		Opponent Branco, J (Joshua)				Opponent Branco, J (Joshua)
3	1	Tournament Eden Top Schools 2023				Tournament Eden Top Schools 2023
		date 2023-08-19	rnd 4	type Standard	result 1	date 2023-08-19	rnd 4	type Standard	result 1
		Opponent Lorebo, Z (Zrebabel)				Opponent Lorebo, Z (Zrebabel)

#	Games	Start				End
1	4	Tournament 2023 Knysna School Trials #1				Tournament 2023 Knysna School Trials #1
		date 2023-02-04	rnd 2	type Standard	result 1	date 2023-02-04	rnd 5	type Standard	result 1
		Opponent Dayimani, S (Simphe)				Opponent Bondt, J (Jamile)
2	1	Tournament Eden School Chess Trials 1 2024				Tournament Eden School Chess Trials 1 2024
		date 2024-03-09	rnd 3	type Standard	result 1	date 2024-03-09	rnd 3	type Standard	result 1
		Opponent Branco, J (Joshua)				Opponent Branco, J (Joshua)
3	1	Tournament Eden Top Schools 2023				Tournament Eden Top Schools 2023
		date 2023-08-19	rnd 4	type Standard	result 1	date 2023-08-19	rnd 4	type Standard	result 1
		Opponent Lorebo, Z (Zrebabel)				Opponent Lorebo, Z (Zrebabel)

No games found.

#	Games	Start				End

No games found.

#	Games	Start				End

#	Games	Start				End
1	4	Tournament 2023 Knysna School Trials #1				Tournament 2023 Knysna School Trials #1
		date 2023-02-04	rnd 2	type Standard	result 1	date 2023-02-04	rnd 5	type Standard	result 1
		Opponent Dayimani, S (Simphe)				Opponent Bondt, J (Jamile)
2	1	Tournament Eden School Chess Trials 1 2024				Tournament Eden School Chess Trials 1 2024
		date 2024-03-09	rnd 3	type Standard	result 1	date 2024-03-09	rnd 3	type Standard	result 1
		Opponent Branco, J (Joshua)				Opponent Branco, J (Joshua)
3	1	Tournament Eden Top Schools 2023				Tournament Eden Top Schools 2023
		date 2023-08-19	rnd 4	type Standard	result 1	date 2023-08-19	rnd 4	type Standard	result 1
		Opponent Lorebo, Z (Zrebabel)				Opponent Lorebo, Z (Zrebabel)

#	Games	Start				End
1	4	Tournament 2023 Knysna School Trials #1				Tournament 2023 Knysna School Trials #1
		date 2023-02-04	rnd 2	type Standard	result 1	date 2023-02-04	rnd 5	type Standard	result 1
		Opponent Dayimani, S (Simphe)				Opponent Bondt, J (Jamile)
2	1	Tournament Eden School Chess Trials 1 2024				Tournament Eden School Chess Trials 1 2024
		date 2024-03-09	rnd 3	type Standard	result 1	date 2024-03-09	rnd 3	type Standard	result 1
		Opponent Branco, J (Joshua)				Opponent Branco, J (Joshua)
3	1	Tournament Eden Top Schools 2023				Tournament Eden Top Schools 2023
		date 2023-08-19	rnd 4	type Standard	result 1	date 2023-08-19	rnd 4	type Standard	result 1
		Opponent Lorebo, Z (Zrebabel)				Opponent Lorebo, Z (Zrebabel)

No games found.

#	Games	Start				End

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	Leshawa ,E (Emzeo)	1	0	-425	1	0	-425	0	0	0	0	0	0
1	Leshawa ,E (Emzeo)	1	1129.2	704.2	1	1131.2	704.2	0	0	0	0	0	0
2	Punt ,H (Heinrich)	1	0	-425	1	0	-425	0	0	0	0	0	0
2	Punt ,H (Heinrich)	1	1505.1	1080.1	1	1507.1	1080.1	0	0	0	0	0	0
3	Oosthuizen ,S (Shaania)	1	0	-425	1	0	-425	0	0	0	0	0	0
3	Oosthuizen ,S (Shaania)	1	1494.5	1069.5	1	1491.9	1069.5	0	0	0	0	0	0
4	Saaiman ,K (Kayle)	1	0	-425	1	0	-425	0	0	0	0	0	0
4	Saaiman ,K (Kayle)	1	1180	755	1	1170.7	755	0	0	0	0	0	0
5	Dayimani ,S (Simphe)	1	1	425	1	1	425	0	0	0	0	0	0
5	Dayimani ,S (Simphe)	1	1200	1625	1	1200	1625	0	0	0	0	0	0
6	Appels ,J (Jaheem)	1	0	-425	1	0	-425	0	0	0	0	0	0
6	Appels ,J (Jaheem)	1	1200	775	1	1200	775	0	0	0	0	0	0
7	Taute ,H (Haygon)	1	0	-425	1	0	-425	0	0	0	0	0	0
7	Taute ,H (Haygon)	1	1244.9	819.9	1	1251.8	819.9	0	0	0	0	0	0
8	Kachingwe ,R (Raymond)	1	1	425	1	1	425	0	0	0	0	0	0
8	Kachingwe ,R (Raymond)	1	1200	1625	1	1200	1625	0	0	0	0	0	0
9	Swanepoel ,L (Louis)	1	0	-425	1	0	-425	0	0	0	0	0	0
9	Swanepoel ,L (Louis)	1	1192.3	767.3	1	1189.6	767.3	0	0	0	0	0	0
10	De Waal ,L (Liam)	1	0	-425	1	0	-425	0	0	0	0	0	0
10	De Waal ,L (Liam)	1	1487.6	1062.6	1	1484.3	1062.6	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

Koen, A (Alonzo)

Ratings

Game statistics

Rankings

Historical performance

Last 24 raw ratings

Rating graph

Tournaments

Top 3 Streaks

Top 10 opponents most often played

Norms