Surname or Chess SA id..
Chess SA Region AOC

PLAYER PAGE

Zac Gemmell

1090116569
Johannesburg Metro (GJM)
Personal
Main rating
Rating 1574.8
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 1533.9
Final +/- 0
New Rating
()
Rating 1574.8
K-factor 28
Floor 1236.7
Highest 1736.7 (2025-03-01)
Min/Max +/- allowed 77.2
Standard rating
Rating 1580.2
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 1533.9
Final +/- 0
New Rating
()
Rating 1580.2
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 1175
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 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
2 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
3 MCA Tshwane Welcome 2026 (B) Standard 2026-01-24 2026-01-24 Tshwane (GTP) 5 1563.3 5 3 1597.6 1.6 Details
4 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
5 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
6 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
7 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
8 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
9 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
10 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
11 South African Open 2025 (Blitz) Blitz 2025-07-02 2025-07-02 Johannesburg Metro (GJM) 9 1592.9 9 5 1518.2 -3 Details
12 JMC Helpmekaar 2025 (A) Standard 2025-06-01 2025-06-01 Johannesburg Metro (GJM) 5 1620.4 5 1.5 1608 -2 Details
13 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
14 Ekurhuleni Trials 2025 (A) Standard 2025-05-24 2025-05-24 Ekurhuleni (GE) 5 1687.1 4 1.5 1741.1 2.8 Details
15 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
16 CPH May 2025 (A) Standard 2025-05-03 2025-05-03 Johannesburg Metro (GJM) 5 1687.1 4 0.5 1445 -18.9 Details
17 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
18 Lubowski Open 2025 (A) Standard 2025-03-21 2025-03-22 Tshwane (GTP) 5 1736.7 4 0.5 1425.9 -27.4 Details
19 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
20 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
21 MCA Welcome 2025 (Expert) Standard 2025-02-15 2025-02-15 Johannesburg Metro (GJM) 5 1628.3 4 2 1822 14.9 Details
22 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
23 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
24 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
25 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
26 CPH Boksburg Open 2024 (A) Standard 2024-10-25 2024-10-26 Ekurhuleni (GE) 5 1543.1 4 0 1291.2 -22.3 Details
27 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
28 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
29 Ekurhuleni Closed 2024 (U16) Standard 2024-09-21 2024-09-21 Ekurhuleni (GE) 5 1483.5 5 4.5 1741.2 24.7 Details
30 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
31 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
32 Ekurhuleni Trails 3 2024 (U16) Standard 2024-08-24 2024-08-24 Ekurhuleni (GE) 5 1483.5 5 3 1454.6 -2 Details
33 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
34 Ekurhuleni Trails 2 2024 (U16) Standard 2024-07-27 2024-07-27 Ekurhuleni (GE) 5 1395.8 5 3 1314.4 -7.3 Details
35 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
36 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
37 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
38 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
39 Boksburg Rapid 2024 (A) Rapid 2024-05-14 2024-06-11 Ekurhuleni (GE) 5 1272.7 5 1.5 1422.4 8.6 Details
40 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
41 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
42 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
43 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
44 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
45 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
46 Ekurhuleni Open 2024 (B) Standard 2024-04-06 2024-04-06 Ekurhuleni (GE) 5 1344.1 3 0 912.9 -24.6 Details
47 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
48 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
49 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
50 2024 Gauteng Inter-Region Chess Championship (U16A) Standard 2024-01-13 2024-01-14 Tshwane (GTP) 5 1305.2 5 3.5 1547.7 27.6 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 19
Wins 11
Draws 2
Losses 6
White 11
Black 8
White wins 8
Black wins 3
Score 12
Percent 63.2
Dp 111.8
AOR 1475.7
Performance 1587.5
Game statistics (History)
Games 337
Wins 159
Draws 35
Losses 143
White 169
Black 168
White wins 81
Black wins 78
Score 176.5
Percent 52.4
Dp 20.2
AOR 1440.5
Performance 1460.7
Rankings (Main)
National
Overall 1232
Gender 1117
Age group 136
Gender/Age 119
Provincial
Overall 442
Gender 393
Age group 49
Gender/Age 43
Regional
Overall 167
Gender 146
Age group 18
Gender/Age 16
Rankings (Standard)
National
Overall 1101
Gender 990
Age group 116
Gender/Age 101
Provincial
Overall 399
Gender 353
Age group 44
Gender/Age 38
Regional
Overall 153
Gender 132
Age group 17
Gender/Age 14
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 19
Score 12
Percent 63.2
Aor 1475.7
Dp 111.8
Prat 1587.5
Performance (12 months)
Games 63
Score 33.5
Percent 53.2
Aor 1495.8
Dp 27
Prat 1522.8
Performance (History)
Games 337
Score 176.5
Percent 52.4
Aor 1440.5
Dp 20.2
Prat 1460.7
Top 5 opponents most often played
Type # Opponent Games White Black First tournament Last tournament Details
Overall 1 Combrink, J (Juan-Louis) 9 3 6 Boksburg Chess Club Rapid 2023 South African Open 2025 (Blitz) 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 Marimuthu, S (Shaylen) 3 0 3 Gauteng Inter-Region at UJ 2024 (U16 Open) MCA Tshwane Welcome 2026 (B) Details
Standard 1 Combrink, J (Juan-Louis) 5 2 3 Gauteng Inter-Region at UJ 2024 (U16 Open) CPH May 2025 (A) Details
Standard 2 Grootboom, C (Chante) 4 3 1 Ekurhuleni Trails 1 2024 (U16) East Rand Chess Year end Open 2024 (B) Details
Standard 3 Shen Yu, F (Frank) 4 1 3 Ekurhuleni Trials 2 2023 (U16) Gauteng Inter-Region at Emerald Resort 2025 (U18 Championship) 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