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

PLAYER PAGE

Zac Gemmell

1090116569
Johannesburg Metro (GJM)
Personal
Main rating
Rating 1621.7
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 1603.9
Final +/- 0
New Rating
()
Rating 1621.7
K-factor 28
Floor 1236.7
Highest 1736.7 (2025-03-01)
Min/Max +/- allowed 77.2
Standard rating
Rating 1631
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 1603.9
Final +/- 0
New Rating
()
Rating 1631
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 1155.5
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 Elise Steenkamp 2026 (King) Standard 2026-06-13 2026-06-15 Tshwane (GTP) 7 1574.8 7 3 1817.3 47 Details
2 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
3 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
4 MCA Tshwane Welcome 2026 (B) Standard 2026-01-24 2026-01-24 Tshwane (GTP) 5 1563.3 5 3 1597.6 1.6 Details
5 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
6 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
7 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
8 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
9 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
10 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
11 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
12 South African Open 2025 (Blitz) Blitz 2025-07-02 2025-07-02 Johannesburg Metro (GJM) 9 1592.9 9 5 1518.2 -3 Details
13 JMC Helpmekaar 2025 (A) Standard 2025-06-01 2025-06-01 Johannesburg Metro (GJM) 5 1620.4 5 1.5 1608 -2 Details
14 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
15 Ekurhuleni Trials 2025 (A) Standard 2025-05-24 2025-05-24 Ekurhuleni (GE) 5 1687.1 4 1.5 1741.1 2.8 Details
16 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
17 CPH May 2025 (A) Standard 2025-05-03 2025-05-03 Johannesburg Metro (GJM) 5 1687.1 4 0.5 1445 -18.9 Details
18 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
19 Lubowski Open 2025 (A) Standard 2025-03-21 2025-03-22 Tshwane (GTP) 5 1736.7 4 0.5 1425.9 -27.4 Details
20 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
21 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
22 MCA Welcome 2025 (Expert) Standard 2025-02-15 2025-02-15 Johannesburg Metro (GJM) 5 1628.3 4 2 1822 14.9 Details
23 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
24 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
25 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
26 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
27 CPH Boksburg Open 2024 (A) Standard 2024-10-25 2024-10-26 Ekurhuleni (GE) 5 1543.1 4 0 1291.2 -22.3 Details
28 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
29 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
30 Ekurhuleni Closed 2024 (U16) Standard 2024-09-21 2024-09-21 Ekurhuleni (GE) 5 1483.5 5 4.5 1741.2 24.7 Details
31 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
32 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
33 Ekurhuleni Trails 3 2024 (U16) Standard 2024-08-24 2024-08-24 Ekurhuleni (GE) 5 1483.5 5 3 1454.6 -2 Details
34 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
35 Ekurhuleni Trails 2 2024 (U16) Standard 2024-07-27 2024-07-27 Ekurhuleni (GE) 5 1395.8 5 3 1314.4 -7.3 Details
36 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
37 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
38 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
39 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
40 Boksburg Rapid 2024 (A) Rapid 2024-05-14 2024-06-11 Ekurhuleni (GE) 5 1272.7 5 1.5 1422.4 8.6 Details
41 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
42 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
43 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
44 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
45 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
46 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
47 Ekurhuleni Open 2024 (B) Standard 2024-04-06 2024-04-06 Ekurhuleni (GE) 5 1344.1 3 0 912.9 -24.6 Details
48 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
49 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
50 Chess Power House 1st Rapid 2024 (A) Rapid 2024-02-24 2024-02-24 Johannesburg Metro (GJM) 5 1349.4 5 4 1496.6 12.6 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 26
Wins 14
Draws 2
Losses 10
White 15
Black 11
White wins 10
Black wins 4
Score 15
Percent 57.7
Dp 65.4
AOR 1584
Performance 1649.4
Game statistics (History)
Games 344
Wins 162
Draws 35
Losses 147
White 173
Black 171
White wins 83
Black wins 79
Score 179.5
Percent 52.2
Dp 18.5
AOR 1449.4
Performance 1467.9
Rankings (Main)
National
Overall 935
Gender 866
Age group 95
Gender/Age 87
Provincial
Overall 334
Gender 305
Age group 33
Gender/Age 31
Regional
Overall 132
Gender 118
Age group 14
Gender/Age 14
Rankings (Standard)
National
Overall 813
Gender 751
Age group 85
Gender/Age 76
Provincial
Overall 299
Gender 275
Age group 30
Gender/Age 28
Regional
Overall 115
Gender 103
Age group 12
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 26
Score 15
Percent 57.7
Aor 1584
Dp 65.4
Prat 1649.4
Performance (12 months)
Games 45
Score 25
Percent 55.6
Aor 1581.6
Dp 47.2
Prat 1628.9
Performance (History)
Games 344
Score 179.5
Percent 52.2
Aor 1449.4
Dp 18.5
Prat 1467.9
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 Marimuthu, S (Shaylen) 3 0 3 Gauteng Inter-Region at UJ 2024 (U16 Open) MCA Tshwane Welcome 2026 (B) 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