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

PLAYER PAGE

Thalia Anne Costa

2180314648
Eden (WEG)
Personal
Main rating
Rating 1253.9
K-factor 36
Floor 781.7
Highest 1281.7 (2026-03-01)
Min/Max +/- allowed 148
Rating Change
()
Games 0
Score 0
We 0
SWe 0
Temp +/- 0
Penalties 0
Weight perform 1186.9
Final +/- 0
New Rating
()
Rating 1253.9
K-factor 36
Floor 781.7
Highest 1281.7 (2026-03-01)
Min/Max +/- allowed 147.6
Standard rating
Rating 1254.6
K-factor 36
Floor 789.8
Highest 1289.8 (2026-03-01)
Min/Max +/- allowed 145.9
Rating Change
()
Games 0
Score 0
We 0
SWe 0
Temp +/- 0
Penalties 0
Weight perform 1186.9
Final +/- 0
New Rating
()
Rating 1254.6
K-factor 36
Floor 789.8
Highest 1289.8 (2026-03-01)
Min/Max +/- allowed 145.9
Rapid rating
Rating 1201.8
K-factor 36
Floor 701.8
Highest 1201.8 (2025-11-30)
Min/Max +/- allowed 165.4
Rating Change
()
Games 0
Score 0
We 0
SWe 0
Temp +/- 0
Penalties 0
Weight perform 0
Final +/- 0
New Rating
()
Rating 1201.8
K-factor 36
Floor 701.8
Highest 1201.8 (2025-11-30)
Min/Max +/- allowed 165.4
Blitz rating
Rating 1200
K-factor 36
Floor 700
Highest 1200 (2025-03-01)
Min/Max +/- allowed 165.8
Rating Change
()
Games 0
Score 0
We 0
SWe 0
Temp +/- 0
Penalties 0
Weight perform 0
Final +/- 0
New Rating
()
Rating 1200
K-factor 36
Floor 700
Highest 1200 (2025-03-01)
Min/Max +/- allowed 165.8
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 George Top Schools 2026 (U9 Girls) Standard 2026-07-25 2026-07-25 Eden (WEG) 5 1253.9 4 3 1230.2 -0.8 Details
2 Eden Chess Trials 2 2026 (U10 Girls) Standard 2026-05-23 2026-05-23 Eden (WEG) 5 1281.7 5 2 1120.4 -26.9 Details
3 Eden Schools Trials 1 2026 (U9 Girls) Standard 2026-03-14 2026-03-14 Eden (WEG) 5 1246.5 5 3 1330.4 16 Details
4 George Trials 3 2026 (U9 Girls) Standard 2026-02-28 2026-02-28 Eden (WEG) 5 1246.5 5 3 1337.1 17.2 Details
5 George Trials 2 2026 (U9 Girls) Standard 2026-02-14 2026-02-14 Eden (WEG) 5 1232 4 1.5 1143.4 -6.8 Details
6 George Trials 1 2026 (U9 Girls) Standard 2026-01-31 2026-01-31 Eden (WEG) 5 1232 5 3 1379.5 8.7 Details
7 Voories Skaaktoernooi 2025 (O7) Rapid 2025-11-08 2025-11-08 Eden (WEG) 5 1220.7 5 2.5 1313.1 6.3 Details
8 Western Cape Schools - Top Schools 2025 (U7) Standard 2025-09-06 2025-09-07 Overberg (WOS) 6 1199.7 5 3 1314.8 10.5 Details
9 George Schools Chess Trials 3 2025 (U7 Girls) Standard 2025-03-01 2025-03-01 Eden (WEG) 5 1198.8 4 1 1013.3 -14.4 Details
10 George Schools Chess Trials 1 2025 (U7 Gils) Standard 2025-02-01 2025-02-01 Eden (WEG) 5 1200 5 2 1115 -7.6 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 28
Wins 15
Draws 1
Losses 12
White 12
Black 16
White wins 6
Black wins 9
Score 15.5
Percent 55.4
Dp 45.5
AOR 1216.3
Performance 1261.9
Game statistics (History)
Games 47
Wins 23
Draws 2
Losses 22
White 21
Black 26
White wins 10
Black wins 13
Score 24
Percent 51.1
Dp 9
AOR 1227.1
Performance 1236.2
Rankings (Main)
National
Overall 8402
Gender 1647
Age group 443
Gender/Age 105
Provincial
Overall 2417
Gender 558
Age group 172
Gender/Age 43
Regional
Overall 589
Gender 150
Age group 58
Gender/Age 17
Rankings (Standard)
National
Overall 7147
Gender 1477
Age group 410
Gender/Age 102
Provincial
Overall 2035
Gender 518
Age group 149
Gender/Age 44
Regional
Overall 556
Gender 153
Age group 61
Gender/Age 18
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 28
Score 15.5
Percent 55.4
Aor 1216.3
Dp 45.5
Prat 1261.9
Performance (12 months)
Games 33
Score 18
Percent 54.5
Aor 1231
Dp 38.6
Prat 1269.6
Performance (History)
Games 47
Score 24
Percent 51.1
Aor 1227.1
Dp 9
Prat 1236.2
Top 5 opponents most often played
Type # Opponent Games White Black First tournament Last tournament Details
Overall 1 Ruiters, Z (Zayaan) 3 1 2 George Schools Chess Trials 3 2025 (U7 Girls) Eden Schools Trials 1 2026 (U9 Girls) Details
Overall 2 Vlietstra, L (Lily) 3 1 2 George Schools Chess Trials 1 2025 (U7 Gils) Eden Schools Trials 1 2026 (U9 Girls) Details
Overall 3 Maarman, R (Ryleigh) 2 1 1 Western Cape Schools - Top Schools 2025 (U7) George Trials 2 2026 (U9 Girls) Details
Overall 4 Anthony, A (Avia) 2 2 0 George Schools Chess Trials 3 2025 (U7 Girls) Voories Skaaktoernooi 2025 (O7) Details
Overall 5 Rostoll, C (Chante) 2 2 0 George Schools Chess Trials 1 2025 (U7 Gils) George Schools Chess Trials 3 2025 (U7 Girls) Details
Standard 1 Vlietstra, L (Lily) 3 1 2 George Schools Chess Trials 1 2025 (U7 Gils) Eden Schools Trials 1 2026 (U9 Girls) Details
Standard 2 Rostoll, C (Chante) 2 2 0 George Schools Chess Trials 1 2025 (U7 Gils) George Schools Chess Trials 3 2025 (U7 Girls) Details
Standard 3 Kock, R (Reese) 2 1 1 George Schools Chess Trials 1 2025 (U7 Gils) George Top Schools 2026 (U9 Girls) Details
Standard 4 Stoffels, Z (Zarah) 2 0 2 George Schools Chess Trials 1 2025 (U7 Gils) Eden Chess Trials 2 2026 (U10 Girls) Details
Standard 5 Nduku, N (Nathiera) 2 2 0 George Trials 1 2026 (U9 Girls) George Trials 3 2026 (U9 Girls) Details