Player Page

Gemmell, Z (Zac)
Dob: 2009/09/21 (U16)
Gender: Male
Chess SA id: 1090116569
FIDE id:
Region: Ekurhuleni (GE)
Citizen: RSA
Title(s):
Last active: 2024/10/26 (29 days ago)
Ratings
Raw rating=Current rating, Weighted rating (WR)=Weighted average of current/new Raw rating + last 23 published Raw ratings), Weighted performance (WP)=Weighted average of last 5 tournaments
Current Raw rating1523.6
Current Weighted rating1385.3
Current Weighted performance1499.6
Current official/published rating (highest between Raw, WR and WP)1523.6
Current highest rating achieved1543.1
Current floor (min rating allowed)1043.1
Current K-factor32
Games played this month0
Score (S)0.0
Expected score (We)0.00
Difference (S-We)0.00
Current Raw change (no limits, including tournament time weight)0.0
Current min/max change allowed (with limits)±104.6
Current Raw change used (final)0.0
Projected new Raw rating1523.6
Projected new Weighed rating1276.0
Projected new Weighted performance1499.6
Projected new final Raw rating (if new WP > new Raw)1523.6
Projected new highest rating1543.1
Projected new floor1043.1
Projected new K-facor32
Projected new official/published rating (highest between new Raw, new WR and new WP)1523.6
Projected effective change (new Official - current Official)=0.0
Raw rating=Current rating, Weighted rating (WR)=Weighted average of current/new Raw rating + last 23 published Raw ratings), Weighted performance (WP)=Weighted average of last 5 tournaments
Current Raw rating1516.6
Current Weighted rating1373.5
Current Weighted performance1499.6
Current official/published rating (highest between Raw, WR and WP)1516.6
Current highest rating achieved1519.5
Current floor (min rating allowed)1019.5
Current K-factor32
Games played this month0
Score (S)0.0
Expected score (We)0.00
Difference (S-We)0.00
Current Raw change (no limits, including tournament time weight)0.0
Current min/max change allowed (with limits)±105.6
Current Raw change used (final)0.0
Projected new Raw rating1516.6
Projected new Weighed rating1264.8
Projected new Weighted performance1499.6
Projected new final Raw rating (if new WP > new Raw)1516.6
Projected new highest rating1519.5
Projected new floor1019.5
Projected new K-facor32
Projected new official/published rating (highest between new Raw, new WR and new WP)1516.6
Projected effective change (new Official - current Official)=0.0
s
Raw rating=Current rating, Weighted rating (WR)=Weighted average of current/new Raw rating + last 23 published Raw ratings), Weighted performance (WP)=Weighted average of last 5 tournaments
Current Raw rating1304.7
Current Weighted rating1216.1
Current Weighted performance1383.5
Current official/published rating (highest between Raw, WR and WP)1383.5
Current highest rating achieved1304.7
Current floor (min rating allowed)804.7
Current K-factor36
Games played this month0
Score (S)0.0
Expected score (We)0.00
Difference (S-We)0.00
Current Raw change (no limits, including tournament time weight)0.0
Current min/max change allowed (with limits)±142.8
Current Raw change used (final)0.0
Projected new Raw rating1304.7
Projected new Weighed rating1120.7
Projected new Weighted performance1383.5
Projected new final Raw rating (if new WP > new Raw)1383.5
Projected new highest rating1383.5
Projected new floor883.5
Projected new K-facor36
Projected new official/published rating (highest between new Raw, new WR and new WP)1383.5
Projected effective change (new Official - current Official)=0.0
Raw rating=Current rating, Weighted rating (WR)=Weighted average of current/new Raw rating + last 23 published Raw ratings), Weighted performance (WP)=Weighted average of last 5 tournaments
Current Raw rating1200.0
Current Weighted rating1200.0
Current Weighted performance
Current official/published rating (highest between Raw, WR and WP)1200.0
Current highest rating achieved1200.0
Current floor (min rating allowed)700.0
Current K-factor36
Games played this month0
Score (S)0.0
Expected score (We)0.00
Difference (S-We)0.00
Current Raw change (no limits, including tournament time weight)0.0
Current min/max change allowed (with limits)±165.8
Current Raw change used (final)0.0
Projected new Raw rating1200.0
Projected new Weighed rating1104.0
Projected new Weighted performance
Projected new final Raw rating (if new WP > new Raw)
Projected new highest rating1200.0
Projected new floor700.0
Projected new K-facor36
Projected new official/published rating (highest between new Raw, new WR and new WP)1200.0
Projected effective change (new Official - current Official)=0.0
Tournaments
Did not participate this month.
#TournamentStartEndHostTypeTimeWeightRnsGmsScrMainTypeAnalysis
25 CPH Boksburg Open 2024 (A) 2024/10/25 2024/10/26 Ekurhuleni (GE) Standard 90 0.94 5 4 0.0 1543.1 1519.5 Analysis
24 2024 Tshwane Chess Club Clash (Open) 2024/10/12 2024/10/12 Tshwane (GTP) Standard 60 0.83 5 5 3.0 1543.1 1519.5 Analysis
23 2024 Gauteng North Open Chess Tournament (A) 2024/10/05 2024/10/06 Tshwane (GTP) Standard 90 0.94 5 5 2.0 1543.1 1519.5 Analysis
22 Ekurhuleni Closed 2024 (U16) 2024/09/21 2024/09/21 Ekurhuleni (GE) Standard 60 0.83 5 5 4.5 1483.5 1436.7 Analysis
21 Mzansi Spring Open 2024 (Intermediate) 2024/09/07 2024/09/07 Johannesburg Metro (GJM) Standard 60 0.83 5 5 3.5 1483.5 1436.7 Analysis
20 JCC Khelo India 1st Annual Chess Tournament 2024 (B) 2024/08/31 2024/08/31 Johannesburg Metro (GJM) Standard 60 0.83 5 5 3.5 1483.5 1436.7 Analysis
19 Ekurhuleni Trails 3 2024 (U16) 2024/08/24 2024/08/24 Ekurhuleni (GE) Standard 60 0.83 5 5 3.0 1483.5 1436.7 Analysis
18 Bojanala's FIDE In The Sparkling Waters 2024 (Prestige) 2024/08/16 2024/08/18 Bojanala Platina (NBR) Standard 120 1.00 6 6 3.0 1429.4 1381.0 Analysis
17 Ekurhuleni Trails 2 2024 (U16) 2024/07/27 2024/07/27 Ekurhuleni (GE) Standard 60 0.83 5 5 3.0 1395.8 1416.5 Analysis
16 Chess Power House July Open 2024 (B) 2024/07/20 2024/07/20 Johannesburg Metro (GJM) Standard 60 0.83 5 4 1.5 1395.8 1416.5 Analysis
15 Midvaal Winter Classic 13 July 2024 (A) 2024/07/13 2024/07/13 Sedibeng (GSV) Rapid 30 0.60 7 7 4.0 1395.8 1210.4 Analysis
14 South African Open Chess Championship 2024 (B) 2024/06/29 2024/07/07 Ethekwini (KED) Standard 120 1.00 11 10 6.0 1395.8 1416.5 Analysis
13 Chess Power House June Open 2024 (B) 2024/06/23 2024/06/23 Ekurhuleni (GE) Standard 60 0.83 5 5 2.0 1272.7 1250.2 Analysis
12 Second Knight Riders Juniors Open Chess Tournament 2024 (A+B) 2024/06/08 2024/06/08 Johannesburg Metro (GJM) Standard 60 0.83 5 5 3.0 1272.7 1250.2 Analysis
11 JMC Trinityhouse Little Falls 2024 (C) 2024/06/02 2024/06/02 Johannesburg Metro (GJM) Standard 60 0.83 5 5 3.0 1272.7 1250.2 Analysis
10 Ekurhuleni Trails 1 2024 (U16) 2024/06/01 2024/06/01 Ekurhuleni (GE) Standard 62 0.84 5 5 3.5 1272.7 1250.2 Analysis
9 Chess Power House May Open 2024 (B) 2024/05/25 2024/05/25 Johannesburg Metro (GJM) Standard 60 0.83 5 5 2.0 1304.8 1297.6 Analysis
8 D6 High School Individual Final 2024 (U15 Boys) 2024/05/18 2024/05/18 Ekurhuleni (GE) Standard 60 0.83 5 5 2.5 1304.8 1297.6 Analysis
7 Boksburg Rapid 2024 (A) 2024/05/14 2024/06/11 Ekurhuleni (GE) Rapid 30 0.60 5 5 1.5 1272.7 1192.8 Analysis
6 JMC Crawford International Sandton 2024 (C) 2024/05/11 2024/05/11 Johannesburg Metro (GJM) Standard 60 0.83 5 5 2.0 1304.8 1297.6 Analysis
12
#TournamentStartEndHostTypeTimeWeightRoundsGamesScoreMainTypeAnalysis
41 CPH Boksburg Open 2024 (A) 2024/10/25 2024/10/26 Ekurhuleni (GE) Standard 90 0.94 5 4 0.0 1543.1 1519.5 Analysis
40 2024 Tshwane Chess Club Clash (Open) 2024/10/12 2024/10/12 Tshwane (GTP) Standard 60 0.83 5 5 3.0 1543.1 1519.5 Analysis
39 2024 Gauteng North Open Chess Tournament (A) 2024/10/05 2024/10/06 Tshwane (GTP) Standard 90 0.94 5 5 2.0 1543.1 1519.5 Analysis
38 Ekurhuleni Closed 2024 (U16) 2024/09/21 2024/09/21 Ekurhuleni (GE) Standard 60 0.83 5 5 4.5 1483.5 1436.7 Analysis
37 Mzansi Spring Open 2024 (Intermediate) 2024/09/07 2024/09/07 Johannesburg Metro (GJM) Standard 60 0.83 5 5 3.5 1483.5 1436.7 Analysis
36 JCC Khelo India 1st Annual Chess Tournament 2024 (B) 2024/08/31 2024/08/31 Johannesburg Metro (GJM) Standard 60 0.83 5 5 3.5 1483.5 1436.7 Analysis
35 Ekurhuleni Trails 3 2024 (U16) 2024/08/24 2024/08/24 Ekurhuleni (GE) Standard 60 0.83 5 5 3.0 1483.5 1436.7 Analysis
34 Bojanala's FIDE In The Sparkling Waters 2024 (Prestige) 2024/08/16 2024/08/18 Bojanala Platina (NBR) Standard 120 1.00 6 6 3.0 1429.4 1381.0 Analysis
33 Ekurhuleni Trails 2 2024 (U16) 2024/07/27 2024/07/27 Ekurhuleni (GE) Standard 60 0.83 5 5 3.0 1395.8 1416.5 Analysis
32 Chess Power House July Open 2024 (B) 2024/07/20 2024/07/20 Johannesburg Metro (GJM) Standard 60 0.83 5 4 1.5 1395.8 1416.5 Analysis
31 Midvaal Winter Classic 13 July 2024 (A) 2024/07/13 2024/07/13 Sedibeng (GSV) Rapid 30 0.60 7 7 4.0 1395.8 1210.4 Analysis
30 South African Open Chess Championship 2024 (B) 2024/06/29 2024/07/07 Ethekwini (KED) Standard 120 1.00 11 10 6.0 1395.8 1416.5 Analysis
29 Chess Power House June Open 2024 (B) 2024/06/23 2024/06/23 Ekurhuleni (GE) Standard 60 0.83 5 5 2.0 1272.7 1250.2 Analysis
28 Second Knight Riders Juniors Open Chess Tournament 2024 (A+B) 2024/06/08 2024/06/08 Johannesburg Metro (GJM) Standard 60 0.83 5 5 3.0 1272.7 1250.2 Analysis
27 JMC Trinityhouse Little Falls 2024 (C) 2024/06/02 2024/06/02 Johannesburg Metro (GJM) Standard 60 0.83 5 5 3.0 1272.7 1250.2 Analysis
26 Ekurhuleni Trails 1 2024 (U16) 2024/06/01 2024/06/01 Ekurhuleni (GE) Standard 62 0.84 5 5 3.5 1272.7 1250.2 Analysis
25 Chess Power House May Open 2024 (B) 2024/05/25 2024/05/25 Johannesburg Metro (GJM) Standard 60 0.83 5 5 2.0 1304.8 1297.6 Analysis
24 D6 High School Individual Final 2024 (U15 Boys) 2024/05/18 2024/05/18 Ekurhuleni (GE) Standard 60 0.83 5 5 2.5 1304.8 1297.6 Analysis
23 Boksburg Rapid 2024 (A) 2024/05/14 2024/06/11 Ekurhuleni (GE) Rapid 30 0.60 5 5 1.5 1272.7 1192.8 Analysis
22 JMC Crawford International Sandton 2024 (C) 2024/05/11 2024/05/11 Johannesburg Metro (GJM) Standard 60 0.83 5 5 2.0 1304.8 1297.6 Analysis
123
Game History
Colour Games Wins Draws Losses Score % Dp Aor Perform
Main All 130 63 12 55 69.0 53.1 26.2 1406.6 1432.7
White 66 35 5 26 37.5 56.8 58.0 1390.1 1448.1
Black 64 28 7 29 31.5 49.2 -6.6 1423.6 1416.9
Standard All 102 49 11 42 54.5 53.4 29.2 1402.2 1431.3
White 50 27 4 19 29.0 58.0 68.0 1386.0 1454.0
Black 52 22 7 23 25.5 49.0 -8.2 1417.8 1409.6
Rapid All 28 14 1 13 14.5 51.8 15.2 1422.6 1437.8
White 16 8 1 7 8.5 53.1 26.6 1403.0 1429.6
Black 12 6 0 6 6.0 50.0 0.0 1448.7 1448.7
Blitz All 0 0 0 0 0.0 0.0 0.0 0.0 0.0
White 0 0 0 0 0.0 0.0 0.0 0.0 0.0
Black 0 0 0 0 0.0 0.0 0.0 0.0 0.0
Colour Games Wins Draws Losses Score % Dp Aor Perform
Main All 205 102 16 87 110.0 53.7 31.1 1357.7 1388.8
White 101 53 7 41 56.5 55.9 50.5 1348.5 1399.0
Black 104 49 9 46 53.5 51.4 12.3 1366.6 1378.8
Standard All 158 81 14 63 88.0 55.7 48.4 1357.3 1405.7
White 77 43 6 28 46.0 59.7 82.8 1343.4 1426.2
Black 81 38 8 35 42.0 51.9 15.7 1370.5 1386.3
Rapid All 47 21 2 24 22.0 46.8 -27.1 1359.0 1331.8
White 24 10 1 13 10.5 43.8 -53.1 1365.0 1311.9
Black 23 11 1 11 11.5 50.0 0.0 1352.6 1352.6
Blitz All 0 0 0 0 0.0 0.0 0.0 0.0 0.0
White 0 0 0 0 0.0 0.0 0.0 0.0 0.0
Black 0 0 0 0 0.0 0.0 0.0 0.0 0.0
Top 20 opponents most often played
#Chess SA idNameGamesScoreWinsDrawsLosses%AorDpPerformView
1 1090114761 Saunders, W (Wayde) 4 2.5 2 1 1 62.5 1447.9 106.3 1554.2 View list
2 209083780 Grootboom, C (Chante) 3 3.0 3 0 0 100.0 1384.0 425.0 1809.0 View list
3 1090101509 Janse Van Vuuren, A (Alexander) 3 1.0 1 0 2 33.3 1380.5 -141.7 1238.8 View list
4 1100301387 Mashapa, K (Kgotso) 3 1.0 1 0 2 33.3 1440.0 -141.7 1298.4 View list
5 1100151738 Combrink, J (Juan-Louis) 3 0.5 0 1 2 16.7 1359.1 -283.3 1075.8 View list
6 1090119738 Shen Yu, F (Frank) 3 0.0 0 0 3 0.0 1458.3 -425.0 1033.3 View list
7 1110133758 Bloem, J (James) 2 2.0 2 0 0 100.0 1378.1 425.0 1803.1 View list
8 1090111233 Farrell, J (Jonty) 2 2.0 2 0 0 100.0 1228.9 425.0 1653.9 View list
9 2130141410 Van Dyk, T (Tayla) 2 2.0 2 0 0 100.0 1408.0 425.0 1833.0 View list
10 110090820 Voogt, R (Ruan) 2 2.0 2 0 0 100.0 1418.3 425.0 1843.3 View list
11 1090305164 Beifus, A (Aiden) 2 1.5 1 1 0 75.0 1334.3 212.5 1546.8 View list
12 2090155382 Helder, L (Lynette) 2 1.0 1 0 1 50.0 1439.7 0.0 1439.7 View list
13 1090153005 Kutukesidi, R (Raphael) 2 1.0 1 0 1 50.0 1432.1 0.0 1432.1 View list
14 1130300249 Mankena, S (Satvik Ram) 2 1.0 1 0 1 50.0 1272.7 0.0 1272.7 View list
15 109080845 Tsai, R (Ray) 2 1.0 1 0 1 50.0 1349.4 0.0 1349.4 View list
16 1090147797 Chokwe, E (Esaie) 2 0.5 0 1 1 25.0 1218.6 -212.5 1006.1 View list
17 1090135389 Horn, C (Cade) 2 0.0 0 0 2 0.0 1432.1 -425.0 1007.1 View list
18 183068085 Magagula, R (Raymond) 2 0.0 0 0 2 0.0 1407.9 -425.0 982.9 View list
19 2090135221 Monteiro Correia, M (Maya) 2 0.0 0 0 2 0.0 1306.8 -425.0 881.8 View list
20 1130140205 Wessels, T (Theodore) 2 0.0 0 0 2 0.0 1400.3 -425.0 975.3 View list