Surname or Chess SA id..
Chess SA Region AOC Mzansi 2026

PLAYER PAGE

Zac Gemmell

1090116569
Johannesburg Metro (GJM)
Personal
Main rating
Rating 1610.5
K-factor 28
Floor 1236.7
Highest 1736.7 (2025-03-01)
Min/Max +/- allowed 77
Rating Change
()
Games 0
Score 0
We 0
SWe 0
Temp +/- 0
Penalties 0
Weight perform 1568.6
Final +/- 0
New Rating
()
Rating 1610.5
K-factor 28
Floor 1236.7
Highest 1736.7 (2025-03-01)
Min/Max +/- allowed 77.2
Standard rating
Rating 1617.3
K-factor 28
Floor 1240.2
Highest 1740.2 (2025-03-01)
Min/Max +/- allowed 76.8
Rating Change
()
Games 0
Score 0
We 0
SWe 0
Temp +/- 0
Penalties 0
Weight perform 1568.6
Final +/- 0
New Rating
()
Rating 1617.3
K-factor 28
Floor 1240.2
Highest 1740.2 (2025-03-01)
Min/Max +/- allowed 76.8
Rapid rating
Rating 1304.7
K-factor 36
Floor 804.7
Highest 1318.9 (2024-07-01)
Min/Max +/- allowed 140
Rating Change
()
Games 0
Score 0
We 0
SWe 0
Temp +/- 0
Penalties 0
Weight perform 1135.6
Final +/- 0
New Rating
()
Rating 1304.7
K-factor 36
Floor 804.7
Highest 1318.9 (2024-07-01)
Min/Max +/- allowed 140
Blitz rating
Rating 1244.9
K-factor 36
Floor 744.9
Highest 1244.9 (2025-08-01)
Min/Max +/- allowed 155.5
Rating Change
()
Games 0
Score 0
We 0
SWe 0
Temp +/- 0
Penalties 0
Weight perform 0
Final +/- 0
New Rating
()
Rating 1244.9
K-factor 36
Floor 744.9
Highest 1244.9 (2025-08-01)
Min/Max +/- allowed 155.5
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 JMC Closed 2026 (A) Standard 2026-08-01 2026-08-02 Johannesburg Metro (GJM) 5 1610.5 4 1 1531.9 -11.3 Details
2 Elise Steenkamp 2026 (King) Standard 2026-06-13 2026-06-15 Tshwane (GTP) 7 1574.8 7 3 1817.3 47 Details
3 2026 Milos Ristic Teams Open (Open) Standard 2026-05-02 2026-05-02 Tshwane (GTP) 5 1585.9 5 3 1509.7 -11.2 Details
4 Chess Power House February Open 2026 (A) Standard 2026-02-21 2026-02-21 Ekurhuleni (GE) 5 1563.3 4 2 1552.6 -0.8 Details
5 MCA Tshwane Welcome 2026 (B) Standard 2026-01-24 2026-01-24 Tshwane (GTP) 5 1563.3 5 3 1597.6 1.6 Details
6 2026 JMC Kick off Tournament (B) Standard 2026-02-01 2026-02-01 Johannesburg Metro (GJM) 5 1563.3 5 4 1683.2 6.3 Details
7 Gauteng Inter-Region at Emerald Resort 2025 (U18 Championship) Standard 2025-12-06 2025-12-07 Sedibeng (GSV) 5 1555.2 5 3 1645.6 9.2 Details
8 Tshwane Chess Club Clash 2025 (Open) Standard 2025-09-13 2025-09-13 Tshwane (GTP) 5 1549.1 5 2.5 1529 -2.7 Details
9 Chess Power House Aug Open 2025 (A) Standard 2025-08-16 2025-08-16 Ekurhuleni (GE) 5 1530.4 4 2 1787.4 19.9 Details
10 JMC Closed 2025 (B) Standard 2025-08-09 2025-08-10 Johannesburg Metro (GJM) 5 1530.4 5 2.5 1478.4 -6.4 Details
11 JMC - Trinity Randpark Ridge 2025 (B) Standard 2025-07-26 2025-07-26 Johannesburg Metro (GJM) 5 1592.9 5 1.5 1275.5 -30.2 Details
12 South African Open 2025 (B) Classical 2025-06-28 2025-07-05 Johannesburg Metro (GJM) 11 1592.9 11 5 1392.6 -50.6 Details
13 South African Open 2025 (Blitz) Blitz 2025-07-02 2025-07-02 Johannesburg Metro (GJM) 9 1592.9 9 5 1518.2 -3 Details
14 JMC Helpmekaar 2025 (A) Standard 2025-06-01 2025-06-01 Johannesburg Metro (GJM) 5 1620.4 5 1.5 1608 -2 Details
15 D6 HS Teams 2025 (U19) Standard 2025-05-31 2025-05-31 Ekurhuleni (GE) 5 1620.4 5 3.5 1424.7 -17.6 Details
16 Ekurhuleni Trials 2025 (A) Standard 2025-05-24 2025-05-24 Ekurhuleni (GE) 5 1687.1 4 1.5 1741.1 2.8 Details
17 Moja Chess Extravaganza 2025 (B) Classical 2025-04-26 2025-05-01 Johannesburg Metro (GJM) 9 1687.1 8 2.5 1508 -31.4 Details
18 CPH May 2025 (A) Standard 2025-05-03 2025-05-03 Johannesburg Metro (GJM) 5 1687.1 4 0.5 1445 -18.9 Details
19 2025 Mid Gauteng Open Chess Tournament (A) Standard 2025-04-12 2025-04-12 Tshwane (GTP) 5 1694.6 5 1.5 1633.7 -5.3 Details
20 Lubowski Open 2025 (A) Standard 2025-03-21 2025-03-22 Tshwane (GTP) 5 1736.7 4 0.5 1425.9 -27.4 Details
21 2025 Chris Greyling Open Chess Tournament (A) Standard 2025-03-15 2025-03-15 Tshwane (GTP) 5 1736.7 5 2 1710 -2.7 Details
22 D6 SH Individual 2025 (U8 Boys) Standard 2025-02-22 2025-02-22 Ekurhuleni (GE) 5 1628.3 5 5 1737.7 12.3 Details
23 MCA Welcome 2025 (Expert) Standard 2025-02-15 2025-02-15 Johannesburg Metro (GJM) 5 1628.3 4 2 1822 14.9 Details
24 2025 Piet Robbertse Fide Rated Open Chess Tournament (B) Standard 2025-02-01 2025-02-02 Tshwane (GTP) 5 1628.3 5 2.5 1602.1 -2.1 Details
25 2025 Tshwane Chess OPEN Registration Tournament (A2) Standard 2025-01-25 2025-01-25 Tshwane (GTP) 5 1543.9 5 3.5 1893.2 33.2 Details
26 Gauteng Inter-Region at UJ 2024 (U16 Open) Standard 2024-12-07 2024-12-08 Johannesburg Metro (GJM) 5 1523.6 5 3 1674.8 17.4 Details
27 East Rand Chess Year end Open 2024 (B) Standard 2024-11-30 2024-11-30 Ekurhuleni (GE) 5 1523.6 5 3.5 1478.9 -4.8 Details
28 CPH Boksburg Open 2024 (A) Standard 2024-10-25 2024-10-26 Ekurhuleni (GE) 5 1543.1 4 0 1291.2 -22.3 Details
29 2024 Tshwane Chess Club Clash (Open) Standard 2024-10-12 2024-10-12 Tshwane (GTP) 5 1543.1 5 3 1634.7 8.1 Details
30 2024 Gauteng North Open Chess Tournament (A) Standard 2024-10-05 2024-10-06 Tshwane (GTP) 5 1543.1 5 2 1641.2 2.1 Details
31 Ekurhuleni Closed 2024 (U16) Standard 2024-09-21 2024-09-21 Ekurhuleni (GE) 5 1483.5 5 4.5 1741.2 24.7 Details
32 Mzansi Spring Open 2024 (Intermediate) Standard 2024-09-07 2024-09-07 Johannesburg Metro (GJM) 5 1483.5 5 3.5 1450.7 -3.7 Details
33 JCC Khelo India 1st Annual Chess Tournament 2024 (B) Standard 2024-08-31 2024-08-31 Johannesburg Metro (GJM) 5 1483.5 5 3.5 1400 -7.3 Details
34 Ekurhuleni Trails 3 2024 (U16) Standard 2024-08-24 2024-08-24 Ekurhuleni (GE) 5 1483.5 5 3 1454.6 -2 Details
35 Bojanala's FIDE In The Sparkling Waters 2024 (Prestige) Classical 2024-08-16 2024-08-18 Bojanala Platina (NBR) 6 1429.4 6 3 1714.3 33.8 Details
36 Ekurhuleni Trails 2 2024 (U16) Standard 2024-07-27 2024-07-27 Ekurhuleni (GE) 5 1395.8 5 3 1314.4 -7.3 Details
37 Chess Power House July Open 2024 (B) Standard 2024-07-20 2024-07-20 Johannesburg Metro (GJM) 5 1395.8 4 1.5 1113.3 -21.9 Details
38 Midvaal Winter Classic 13 July 2024 (A) Rapid 2024-07-13 2024-07-13 Sedibeng (GSV) 7 1395.8 7 4 1689.9 26.6 Details
39 South African Open Chess Championship 2024 (B) Classical 2024-06-29 2024-07-07 Ethekwini (KED) 11 1395.8 10 6 1498.1 23.8 Details
40 Chess Power House June Open 2024 (B) Standard 2024-06-23 2024-06-23 Ekurhuleni (GE) 5 1272.7 5 2 1364.5 8.1 Details
41 Boksburg Rapid 2024 (A) Rapid 2024-05-14 2024-06-11 Ekurhuleni (GE) 5 1272.7 5 1.5 1422.4 8.6 Details
42 Second Knight Riders Juniors Open Chess Tournament 2024 (A+B) Standard 2024-06-08 2024-06-08 Johannesburg Metro (GJM) 5 1272.7 5 3 1522.9 24.9 Details
43 Ekurhuleni Trails 1 2024 (U16) Standard 2024-06-01 2024-06-01 Ekurhuleni (GE) 5 1272.7 5 3.5 1403.7 13.8 Details
44 JMC Trinityhouse Little Falls 2024 (C) Standard 2024-06-02 2024-06-02 Johannesburg Metro (GJM) 5 1272.7 5 3 1485.2 21.6 Details
45 D6 High School Individual Final 2024 (U15 Boys) Standard 2024-05-18 2024-05-18 Ekurhuleni (GE) 5 1304.8 5 2.5 1176.8 -12.9 Details
46 Chess Power House May Open 2024 (B) Standard 2024-05-25 2024-05-25 Johannesburg Metro (GJM) 5 1304.8 5 2 1259.8 -3.7 Details
47 JMC Crawford International Sandton 2024 (C) Standard 2024-05-11 2024-05-11 Johannesburg Metro (GJM) 5 1304.8 5 2 1277.4 -3.5 Details
48 Ekurhuleni Open 2024 (B) Standard 2024-04-06 2024-04-06 Ekurhuleni (GE) 5 1344.1 3 0 912.9 -24.6 Details
49 Ekurhuleni North Chess Club Open Tournament 2024 (C) Rapid 2024-03-02 2024-03-02 Ehlanzeni (MEN) 7 1353.1 7 4 1299.9 -5.7 Details
50 Gear Up Mzansi Rapid 2024 (Intermediate) Rapid 2024-02-17 2024-02-17 Johannesburg Metro (GJM) 5 1349.4 4 1 1183.4 -10.2 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 30
Wins 15
Draws 2
Losses 13
White 17
Black 13
White wins 10
Black wins 5
Score 16
Percent 53.3
Dp 28.3
AOR 1605.4
Performance 1633.7
Game statistics (History)
Games 348
Wins 163
Draws 35
Losses 150
White 175
Black 173
White wins 83
Black wins 80
Score 180.5
Percent 51.9
Dp 15.9
AOR 1452.8
Performance 1468.7
Rankings (Main)
National
Overall 1007
Gender 929
Age group 107
Gender/Age 99
Provincial
Overall 378
Gender 346
Age group 41
Gender/Age 38
Regional
Overall 150
Gender 134
Age group 15
Gender/Age 14
Rankings (Standard)
National
Overall 883
Gender 817
Age group 93
Gender/Age 88
Provincial
Overall 343
Gender 314
Age group 36
Gender/Age 33
Regional
Overall 132
Gender 117
Age group 13
Gender/Age 12
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 30
Score 16
Percent 53.3
Aor 1605.4
Dp 28.3
Prat 1633.7
Performance (12 months)
Games 35
Score 19
Percent 54.3
Aor 1599
Dp 36.4
Prat 1635.4
Performance (History)
Games 348
Score 180.5
Percent 51.9
Aor 1452.8
Dp 15.9
Prat 1468.7
Top 5 opponents most often played
Type # Opponent Games White Black First tournament Last tournament Details
Overall 1 Combrink, J (Juan-Louis) 10 3 7 Boksburg Chess Club Rapid 2023 Elise Steenkamp 2026 (King) Details
Overall 2 Saunders, W (Wayde) 5 3 2 Ekurhuleni Trials 2 2023 (U16) JMC - Trinity Randpark Ridge 2025 (B) Details
Overall 3 Grootboom, C (Chante) 4 3 1 Ekurhuleni Trails 1 2024 (U16) East Rand Chess Year end Open 2024 (B) Details
Overall 4 Shen Yu, F (Frank) 4 1 3 Ekurhuleni Trials 2 2023 (U16) Gauteng Inter-Region at Emerald Resort 2025 (U18 Championship) Details
Overall 5 Janse Van Vuuren, A (Alexander) 3 0 3 Ekurhuleni North Chess Club Open Tournament 2024 (C) Ekurhuleni Closed 2024 (U16) Details
Standard 1 Combrink, J (Juan-Louis) 6 2 4 Gauteng Inter-Region at UJ 2024 (U16 Open) Elise Steenkamp 2026 (King) Details
Standard 2 Shen Yu, F (Frank) 4 1 3 Ekurhuleni Trials 2 2023 (U16) Gauteng Inter-Region at Emerald Resort 2025 (U18 Championship) Details
Standard 3 Grootboom, C (Chante) 4 3 1 Ekurhuleni Trails 1 2024 (U16) East Rand Chess Year end Open 2024 (B) Details
Standard 4 Saunders, W (Wayde) 4 2 2 Ekurhuleni Trials 2 2023 (U16) JMC - Trinity Randpark Ridge 2025 (B) Details
Standard 5 Segal, J (Jamie) 3 3 0 MCA Welcome 2025 (Expert) JMC Closed 2026 (A) Details
Rapid 1 Combrink, J (Juan-Louis) 3 1 2 Boksburg Chess Club Rapid 2023 Boksburg Rapid 2024 (A) Details
Rapid 2 Tsai, R (Ray) 2 1 1 Chess Power House 1st Rapid 2024 (A) Gear Up Mzansi Rapid 2024 (Intermediate) Details