PLAYER PAGE

Mari Grobbelaar

2160158380
Tshwane (GTP)
Personal
Main rating
Rating 1431.1
K-factor 32
Floor 970.3
Highest 1490.2 (2026-01-01)
Min/Max +/- allowed 110
Rating Change
()
Games 5
Score 1.5
We 2.86
SWe -1.12
Temp +/- -36
Penalties 0
Weight perform 1342.3
Final +/- -36
New Rating
()
Rating 1395.1
K-factor 32
Floor 970.3
Highest 1490.2 (2026-01-01)
Min/Max +/- allowed 109.7
Standard rating
Rating 1431.9
K-factor 32
Floor 978
Highest 1488.2 (2026-01-01)
Min/Max +/- allowed 110
Rating Change
()
Games 5
Score 1.5
We 2.96
SWe -1.46
Temp +/- -46.8
Penalties 0
Weight perform 1342.3
Final +/- -46.8
New Rating
()
Rating 1385.1
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
# Tournament Type Start End Host Rounds Rating Games Score Perform Rat+/- Details
1 4th Khelo India - LCA Chess Tournament 2026 (E) Standard 2026-07-12 2026-07-12 Johannesburg Metro (GJM) 5 1431.1 5 1.5 1158.7 -36 Details
# Tournament Type Start End Host Rounds Rating Games Score Perform Rat+/- Details
1 2026 D4 District Individuals (U11 Girls) Standard 2026-05-30 2026-05-30 Tshwane (GTP) 5 1405.3 5 4 1559.2 25.3 Details
2 2026 Milos Ristic Teams Open (Junior) Standard 2026-05-02 2026-05-02 Tshwane (GTP) 5 1399.9 5 3 1441 5.4 Details
3 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
4 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
5 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
6 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
7 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
8 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
9 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
10 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
11 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
12 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
13 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
14 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
15 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
16 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
17 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
18 Lubowski Open 2025 (D2) Standard 2025-03-21 2025-03-22 Tshwane (GTP) 5 1355.7 5 3 1302.4 -6.6 Details
19 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
20 Constantiapark Open 2025 (U10) Standard 2025-02-15 2025-02-15 Tshwane (GTP) 5 1338.3 5 4 1507.3 17.3 Details
21 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
22 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
23 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
24 Lardies Ope 2024 (U10) Standard 2024-10-26 2024-10-26 Tshwane (GTP) 5 1281.1 5 3 1349.2 7.3 Details
25 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
26 2024 Etienne Lewis (U10) Standard 2024-08-30 2024-09-01 Tshwane (GTP) 7 1277.4 7 4 1282.9 1.9 Details
27 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
28 2024 African Youth Chess Championship Classical 2024-06-16 2024-06-22 Tshwane (GTP) 9 1309.9 9 5 1221.4 -9.6 Details
29 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
30 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
31 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
32 2024 Lubowski Open Chess Tournament (D2) Standard 2024-03-23 2024-03-24 Tshwane (GTP) 5 1353.8 5 3 1260 -10.9 Details
33 2024 Constantiapark Open (E) Standard 2024-02-17 2024-02-17 Tshwane (GTP) 5 1359.2 5 3 1320.6 -3 Details
34 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
35 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
36 Lardies Open Tournament 2023 (F) Standard 2023-10-28 2023-10-28 Tshwane (GTP) 5 1251.6 5 3 1323.6 7.8 Details
37 2023 Gauteng Noord (F) Standard 2023-10-14 2023-10-14 Tshwane (GTP) 6 1251.6 6 6 1615.6 48.2 Details
38 2023 Centurion Chess Open (E) Standard 2023-09-23 2023-09-23 Tshwane (GTP) 5 1234.8 5 2 1162.6 -6.3 Details
39 2023 U8 Open Chess Tournament Rapid 2023-09-02 2023-09-02 Tshwane (GTP) 5 1234.8 5 4 1447.1 15.6 Details
40 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
41 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
42 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 5
Wins 1
Draws 1
Losses 3
White 2
Black 3
White wins 0
Black wins 1
Score 1.5
Percent 30
Dp -170
AOR 1328.7
Performance 1158.7
Game statistics ()
Games 44
Wins 20
Draws 4
Losses 20
White 20
Black 24
White wins 8
Black wins 12
Score 22
Percent 50
Dp 0
AOR 1349.9
Performance 1349.9
Game statistics (History)
Games 233
Wins 128
Draws 15
Losses 90
White 114
Black 119
White wins 64
Black wins 64
Score 135.5
Percent 58.2
Dp 69.3
AOR 1272
Performance 1341.3
Rankings (Main)
National
Overall 3031
Gender 432
Age group 249
Gender/Age 54
Provincial
Overall 1036
Gender 149
Age group 88
Gender/Age 17
Regional
Overall 374
Gender 62
Age group 27
Gender/Age 9
Rankings (Standard)
National
Overall 2687
Gender 400
Age group 228
Gender/Age 47
Provincial
Overall 963
Gender 140
Age group 81
Gender/Age 15
Regional
Overall 352
Gender 59
Age group 25
Gender/Age 9
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 5
Score 1.5
Percent 30
Aor 1328.7
Dp -170
Prat 1158.7
Performance ()
Games 44
Score 22
Percent 50
Aor 1349.9
Dp 0
Prat 1349.9
Performance (12 months)
Games 78
Score 44
Percent 56.4
Aor 1340.9
Dp 54.5
Prat 1395.4
Performance (History)
Games 233
Score 135.5
Percent 58.2
Aor 1272
Dp 69.3
Prat 1341.3
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 Nawrattel, A (Abigail) 4 1 3 2023 Gauteng Noord (F) 2025 Wynie Robbertse Chess Tournament (U10) Details
Overall 4 Dixon, G (Genevieve) 4 3 1 2024 Tuks Open Chess Tournament (U10) 2026 D4 District Individuals (U11 Girls) 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 Rocher, G (Gideon) 4 3 1 2023 Menlo Open Tournament (F) Lardies Open Tournament 2023 (F) Details
Standard 4 Dixon, G (Genevieve) 4 3 1 2024 Tuks Open Chess Tournament (U10) 2026 D4 District Individuals (U11 Girls) Details
Standard 5 Nawrattel, A (Abigail) 4 1 3 2023 Gauteng Noord (F) 2025 Wynie Robbertse Chess Tournament (U10) Details