PLAYER PAGE

Mari Grobbelaar

2160158380
Tshwane (GTP)
Personal
Main rating
Rating 1405.3
K-factor 32
Floor 970.3
Highest 1490.2 (2026-01-01)
Min/Max +/- allowed 110
Rating Change
()
Games 0
Score 0
We 0
SWe 0
Temp +/- 0
Penalties 0
Weight perform 1358.7
Final +/- 0
New Rating
()
Rating 1405.3
K-factor 32
Floor 970.3
Highest 1490.2 (2026-01-01)
Min/Max +/- allowed 109.7
Standard rating
Rating 1401.6
K-factor 32
Floor 978
Highest 1488.2 (2026-01-01)
Min/Max +/- allowed 110
Rating Change
()
Games 0
Score 0
We 0
SWe 0
Temp +/- 0
Penalties 0
Weight perform 1358.7
Final +/- 0
New Rating
()
Rating 1401.6
K-factor 32
Floor 978
Highest 1488.2 (2026-01-01)
Min/Max +/- allowed 110
Rapid rating
Rating 1255.4
K-factor 36
Floor 755.4
Highest 1455.5 (2023-09-01)
Min/Max +/- allowed 115.2
Rating Change
()
Games 0
Score 0
We 0
SWe 0
Temp +/- 0
Penalties 0
Weight perform 0
Final +/- 0
New Rating
()
Rating 1255.4
K-factor 36
Floor 755.4
Highest 1455.5 (2023-09-01)
Min/Max +/- allowed 115.2
Blitz rating
Rating 1200
K-factor 36
Floor 700
Highest 1200 (2018-10-01)
Min/Max +/- allowed 165.8
Rating Change
()
Games 0
Score 0
We 0
SWe 0
Temp +/- 0
Penalties 0
Weight perform 0
Final +/- 0
New Rating
()
Rating 1200
K-factor 36
Floor 700
Highest 1200 (2018-10-01)
Min/Max +/- allowed 165.8
Rating Graph
Tournaments
No tournaments found.
# Tournament Type Start End Host Rounds Rating Games Score Perform Rat+/- Details
# Tournament Type Start End Host Rounds Rating Games Score Perform Rat+/- Details
1 2026 Milos Ristic Teams Open (Junior) Standard 2026-05-02 2026-05-02 Tshwane (GTP) 5 1399.9 5 3 1441 5.4 Details
2 South African Junior Closed Chess Championship 2026 (U10 Girls) Classical 2026-03-28 2026-04-02 Bojanala Platina (NBR) 9 1372.4 9 4.5 1450.3 27.4 Details
3 2026 Blou Bull Chess Tournament (U12) Standard 2026-02-21 2026-02-21 Tshwane (GTP) 5 1379.2 5 3 1464.8 12.3 Details
4 2026 AHS Chess Tournament (U12) Standard 2026-02-28 2026-02-28 Tshwane (GTP) 5 1379.2 5 2.5 1248.8 -19.1 Details
5 2026 Piet Robbertse Open Chess Tournament (C) Standard 2026-02-07 2026-02-08 Tshwane (GTP) 5 1474.2 5 1 1109 -39.7 Details
6 2026 Tshwane Chess Registration Tournament (U12-2) Standard 2026-01-31 2026-01-31 Tshwane (GTP) 5 1474.2 5 2.5 1287.5 -17.3 Details
7 2025 Mzansi Individual Championships (U10 Girls) Classical 2025-12-17 2025-12-20 Nelson Mandela Bay (ENM) 6 1376.6 6 4 1458.7 11.6 Details
8 2025 Mzansi Inter Provincial Team Championships (U10 Combined) Standard 2025-12-15 2025-12-17 Nelson Mandela Bay (ENM) 6 1376.6 6 4.5 1448 8.5 Details
9 Gauteng Inter-Region at Emerald Resort 2025 (U8+U10 Girls) Standard 2025-12-06 2025-12-07 Sedibeng (GSV) 5 1376.6 5 5 1673.1 32.1 Details
10 2025 Centurion Chess Open Tournament (U10) Standard 2025-09-27 2025-09-27 Tshwane (GTP) 5 1324.7 5 3.5 1628.5 28.9 Details
11 2025 Tshwane South School District CLOSED League Championship (U9A) Standard 2025-08-15 2025-08-15 Tshwane (GTP) 5 1346.3 5 1.5 1260.9 -7.8 Details
12 2025 Etienne Lewis Closed Chess Tournament (U10) Standard 2025-08-08 2025-08-10 Tshwane (GTP) 7 1346.3 7 3.5 1313.2 -4.3 Details
13 2025 Wynie Robbertse Chess Tournament (U10) Standard 2025-07-19 2025-07-19 Tshwane (GTP) 5 1312.9 5 2.5 1283.8 -3.5 Details
14 South African Open 2025 (U10 Girls) Classical 2025-07-03 2025-07-05 Johannesburg Metro (GJM) 5 1312.9 5 4 1506.9 22 Details
15 Third Knight Riders Junior Open 2025 (U10) Standard 2025-06-22 2025-06-22 Johannesburg Metro (GJM) 5 1311.4 5 3 1326.4 0.8 Details
16 2025 Silver Lakes Chess Club Open Chess Tournament (U10) Standard 2025-05-03 2025-05-03 Tshwane (GTP) 5 1311.1 5 2.5 1289.5 -2.8 Details
17 Lubowski Open 2025 (D2) Standard 2025-03-21 2025-03-22 Tshwane (GTP) 5 1355.7 5 3 1302.4 -6.6 Details
18 2025 Chris Greyling Open Chess Tournament (U10) Standard 2025-03-15 2025-03-15 Tshwane (GTP) 5 1355.7 5 1.5 1105.1 -25.1 Details
19 Constantiapark Open 2025 (U10) Standard 2025-02-15 2025-02-15 Tshwane (GTP) 5 1338.3 5 4 1507.3 17.3 Details
20 2025 Blou Bul Open Chess Tournament (D2) Standard 2025-02-08 2025-02-08 Tshwane (GTP) 5 1338.3 5 2 1172.2 -16.8 Details
21 2025 Tshwane Chess OPEN Registration Tournament (U10) Standard 2025-01-25 2025-01-25 Tshwane (GTP) 5 1318.2 5 3 1401.4 8.8 Details
22 Gauteng Inter-Region at UJ 2024 (u10 gIRLS) Standard 2024-12-07 2024-12-08 Johannesburg Metro (GJM) 5 1294.2 5 3 1407.4 13.3 Details
23 Lardies Ope 2024 (U10) Standard 2024-10-26 2024-10-26 Tshwane (GTP) 5 1281.1 5 3 1349.2 7.3 Details
24 2024 Tuks Open Chess Tournament (U10) Standard 2024-09-28 2024-09-28 Tshwane (GTP) 5 1277.4 5 2 1271.3 0.2 Details
25 2024 Etienne Lewis (U10) Standard 2024-08-30 2024-09-01 Tshwane (GTP) 7 1277.4 7 4 1282.9 1.9 Details
26 Menlopark Open Chess Tournament 2024 (U10) Standard 2024-07-13 2024-07-13 Tshwane (GTP) 5 1246.3 5 3.5 1416.3 17.3 Details
27 2024 African Youth Chess Championship Classical 2024-06-16 2024-06-22 Tshwane (GTP) 9 1309.9 9 5 1221.4 -9.6 Details
28 2024 Johannes Mabusela's 40th Birthday Chess Tournament F Section (D) Standard 2024-06-01 2024-06-01 Tshwane (GTP) 5 1309.9 5 2 1049.7 -25.7 Details
29 2024 Tshwane South School District CLOSED Individual Championships (U11 Girls) Standard 2024-05-11 2024-05-11 Tshwane (GTP) 5 1334.2 5 2 1118.6 -20.1 Details
30 South African Junior Closed Chess Championship 2024 (U8 Girls) Classical 2024-04-27 2024-05-01 Ekurhuleni (GE) 9 1334.2 9 6 1369.9 6.6 Details
31 2024 Lubowski Open Chess Tournament (D2) Standard 2024-03-23 2024-03-24 Tshwane (GTP) 5 1353.8 5 3 1260 -10.9 Details
32 2024 Constantiapark Open (E) Standard 2024-02-17 2024-02-17 Tshwane (GTP) 5 1359.2 5 3 1320.6 -3 Details
33 2024 Tshwane Chess OPEN Registration Tournament (E) Standard 2024-01-27 2024-01-27 Tshwane (GTP) 5 1353.2 5 3.5 1323.8 -3.3 Details
34 2024 Gauteng Inter-Region Chess Championship (U8+U10 Girls) Standard 2024-01-13 2024-01-14 Tshwane (GTP) 5 1353.2 4 3 1438.8 6 Details
35 Lardies Open Tournament 2023 (F) Standard 2023-10-28 2023-10-28 Tshwane (GTP) 5 1251.6 5 3 1323.6 7.8 Details
36 2023 Gauteng Noord (F) Standard 2023-10-14 2023-10-14 Tshwane (GTP) 6 1251.6 6 6 1615.6 48.2 Details
37 2023 Centurion Chess Open (E) Standard 2023-09-23 2023-09-23 Tshwane (GTP) 5 1234.8 5 2 1162.6 -6.3 Details
38 2023 U8 Open Chess Tournament Rapid 2023-09-02 2023-09-02 Tshwane (GTP) 5 1234.8 5 4 1447.1 15.6 Details
39 2023 Woman's Day Open Chess Tournament (Pawn) Standard 2023-08-09 2023-08-09 Tshwane (GTP) 5 1219.1 5 3 1351.5 13.6 Details
40 2023 Etienne Lewis Closed Tournament (U8) Standard 2023-08-26 2023-08-26 Tshwane (GTP) 6 1219.1 5 2 1171.3 -4.5 Details
41 2023 Menlo Open Tournament (F) Standard 2023-07-22 2023-07-22 Tshwane (GTP) 5 1200 5 3 1316.9 10.6 Details
Game statistics ( )
Games 0
Wins 0
Draws 0
Losses 0
White 0
Black 0
White wins 0
Black wins 0
Score 0
Percent 0
Dp 0
AOR 0
Performance 0
Game statistics ()
Games 34
Wins 15
Draws 3
Losses 16
White 16
Black 18
White wins 6
Black wins 9
Score 16.5
Percent 48.5
Dp -12.5
AOR 1359.8
Performance 1347.3
Game statistics (History)
Games 223
Wins 123
Draws 14
Losses 86
White 110
Black 113
White wins 62
Black wins 61
Score 130
Percent 58.3
Dp 70.5
AOR 1270
Performance 1340.5
Rankings (Main)
National
Overall 3484
Gender 540
Age group 289
Gender/Age 64
Provincial
Overall 1193
Gender 188
Age group 103
Gender/Age 18
Regional
Overall 428
Gender 77
Age group 30
Gender/Age 10
Rankings (Standard)
National
Overall 3197
Gender 527
Age group 283
Gender/Age 67
Provincial
Overall 1128
Gender 181
Age group 98
Gender/Age 20
Regional
Overall 418
Gender 75
Age group 30
Gender/Age 11
Rankings (Rapid)
National
Overall -1
Gender -1
Age group -1
Gender/Age -1
Provincial
Overall -1
Gender -1
Age group -1
Gender/Age -1
Regional
Overall -1
Gender -1
Age group -1
Gender/Age -1
Rankings (Blitz)
National
Overall -1
Gender -1
Age group -1
Gender/Age -1
Provincial
Overall -1
Gender -1
Age group -1
Gender/Age -1
Regional
Overall -1
Gender -1
Age group -1
Gender/Age -1
Performance ( )
Games 0
Score 0
Percent 0
Aor 0
Dp 0
Prat 0
Performance ()
Games 34
Score 16.5
Percent 48.5
Aor 1359.8
Dp -12.5
Prat 1347.3
Performance (12 months)
Games 83
Score 48
Percent 57.8
Aor 1329.1
Dp 66.6
Prat 1395.6
Performance (History)
Games 223
Score 130
Percent 58.3
Aor 1270
Dp 70.5
Prat 1340.5
Top 5 opponents most often played
Type # Opponent Games White Black First tournament Last tournament Details
Overall 1 Westermann, Z (Zelri) 7 1 6 2023 Gauteng Noord (F) 2026 AHS Chess Tournament (U12) Details
Overall 2 Barkhuizen, RJ (Reuben Joshua) 5 2 3 2023 Etienne Lewis Closed Tournament (U8) 2025 Tshwane Chess OPEN Registration Tournament (U10) Details
Overall 3 Roos, B (Benjamin) 4 2 2 2023 Etienne Lewis Closed Tournament (U8) 2025 Tshwane South School District CLOSED League Championship (U9A) Details
Overall 4 Nawrattel, A (Abigail) 4 1 3 2023 Gauteng Noord (F) 2025 Wynie Robbertse Chess Tournament (U10) Details
Overall 5 Rocher, G (Gideon) 4 3 1 2023 Menlo Open Tournament (F) Lardies Open Tournament 2023 (F) Details
Standard 1 Westermann, Z (Zelri) 7 1 6 2023 Gauteng Noord (F) 2026 AHS Chess Tournament (U12) Details
Standard 2 Barkhuizen, RJ (Reuben Joshua) 5 2 3 2023 Etienne Lewis Closed Tournament (U8) 2025 Tshwane Chess OPEN Registration Tournament (U10) Details
Standard 3 Roos, B (Benjamin) 4 2 2 2023 Etienne Lewis Closed Tournament (U8) 2025 Tshwane South School District CLOSED League Championship (U9A) Details
Standard 4 Nawrattel, A (Abigail) 4 1 3 2023 Gauteng Noord (F) 2025 Wynie Robbertse Chess Tournament (U10) Details
Standard 5 Rocher, G (Gideon) 4 3 1 2023 Menlo Open Tournament (F) Lardies Open Tournament 2023 (F) Details