Surname or Chess SA id..
Chess SA Region AOC

PLAYER PAGE

Zac Gemmell

1090116569
Johannesburg Metro (GJM)
Personal
Main rating
Rating 1585.9
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 1566.4
Final +/- 0
New Rating
()
Rating 1585.9
K-factor 28
Floor 1236.7
Highest 1736.7 (2025-03-01)
Min/Max +/- allowed 77.2
Standard rating
Rating 1595.1
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 1566.4
Final +/- 0
New Rating
()
Rating 1595.1
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 1194.1
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 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
2 MCA Tshwane Welcome 2026 (B) Standard 2026-01-24 2026-01-24 Tshwane (GTP) 5 1563.3 5 3 1597.6 1.6 Details
3 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
4 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
5 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
6 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
7 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
8 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
9 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
10 South African Open 2025 (Blitz) Blitz 2025-07-02 2025-07-02 Johannesburg Metro (GJM) 9 1592.9 9 5 1518.2 -3 Details
11 JMC Helpmekaar 2025 (A) Standard 2025-06-01 2025-06-01 Johannesburg Metro (GJM) 5 1620.4 5 1.5 1608 -2 Details
12 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
13 Ekurhuleni Trials 2025 (A) Standard 2025-05-24 2025-05-24 Ekurhuleni (GE) 5 1687.1 4 1.5 1741.1 2.8 Details
14 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
15 CPH May 2025 (A) Standard 2025-05-03 2025-05-03 Johannesburg Metro (GJM) 5 1687.1 4 0.5 1445 -18.9 Details
16 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
17 Lubowski Open 2025 (A) Standard 2025-03-21 2025-03-22 Tshwane (GTP) 5 1736.7 4 0.5 1425.9 -27.4 Details
18 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
19 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
20 MCA Welcome 2025 (Expert) Standard 2025-02-15 2025-02-15 Johannesburg Metro (GJM) 5 1628.3 4 2 1822 14.9 Details
21 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
22 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
23 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
24 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
25 CPH Boksburg Open 2024 (A) Standard 2024-10-25 2024-10-26 Ekurhuleni (GE) 5 1543.1 4 0 1291.2 -22.3 Details
26 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
27 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
28 Ekurhuleni Closed 2024 (U16) Standard 2024-09-21 2024-09-21 Ekurhuleni (GE) 5 1483.5 5 4.5 1741.2 24.7 Details
29 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
30 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
31 Ekurhuleni Trails 3 2024 (U16) Standard 2024-08-24 2024-08-24 Ekurhuleni (GE) 5 1483.5 5 3 1454.6 -2 Details
32 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
33 Ekurhuleni Trails 2 2024 (U16) Standard 2024-07-27 2024-07-27 Ekurhuleni (GE) 5 1395.8 5 3 1314.4 -7.3 Details
34 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
35 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
36 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
37 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
38 Boksburg Rapid 2024 (A) Rapid 2024-05-14 2024-06-11 Ekurhuleni (GE) 5 1272.7 5 1.5 1422.4 8.6 Details
39 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
40 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
41 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
42 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
43 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
44 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
45 Ekurhuleni Open 2024 (B) Standard 2024-04-06 2024-04-06 Ekurhuleni (GE) 5 1344.1 3 0 912.9 -24.6 Details
46 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
47 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
48 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
49 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
50 Ekurhuleni Chess Spring Tournament 2023 (C) Standard 2023-09-23 2023-09-23 Ekurhuleni (GE) 5 1349.8 5 1 1072.4 -27.7 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 14
Wins 9
Draws 0
Losses 5
White 8
Black 6
White wins 7
Black wins 2
Score 9
Percent 64.3
Dp 121.4
AOR 1493.9
Performance 1615.3
Game statistics (History)
Games 332
Wins 157
Draws 33
Losses 142
White 166
Black 166
White wins 80
Black wins 77
Score 173.5
Percent 52.3
Dp 19.2
AOR 1440.8
Performance 1460
Rankings (Main)
National
Overall 1096
Gender 1002
Age group 116
Gender/Age 99
Provincial
Overall 385
Gender 350
Age group 40
Gender/Age 36
Regional
Overall 145
Gender 130
Age group 14
Gender/Age 13
Rankings (Standard)
National
Overall 962
Gender 880
Age group 100
Gender/Age 84
Provincial
Overall 356
Gender 324
Age group 36
Gender/Age 31
Regional
Overall 130
Gender 116
Age group 12
Gender/Age 10
Rankings (Rapid)
National
Overall 1876
Gender 1556
Age group 244
Gender/Age 205
Provincial
Overall 325
Gender 272
Age group 37
Gender/Age 32
Regional
Overall 136
Gender 122
Age group 15
Gender/Age 14
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 14
Score 9
Percent 64.3
Aor 1493.9
Dp 121.4
Prat 1615.3
Performance (12 months)
Games 84
Score 40
Percent 47.6
Aor 1548.4
Dp -20.2
Prat 1528.1
Performance (History)
Games 332
Score 173.5
Percent 52.3
Aor 1440.8
Dp 19.2
Prat 1460
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 Tshetlo, T (Tshepo) 3 2 1 Midvaal Winter Classic 13 July 2024 (A) Tshwane Chess Club Clash 2025 (Open) 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 Saunders, W (Wayde) 4 2 2 Ekurhuleni Trials 2 2023 (U16) JMC - Trinity Randpark Ridge 2025 (B) Details
Standard 4 Shen Yu, F (Frank) 4 1 3 Ekurhuleni Trials 2 2023 (U16) Gauteng Inter-Region at Emerald Resort 2025 (U18 Championship) 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