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

PLAYER PAGE

Thalia Anne Costa

2180314648
Eden (WEG)
Personal
Main rating
Rating 1254.7
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 1198.1
Final +/- 0
New Rating
()
Rating 1254.7
K-factor 36
Floor 781.7
Highest 1281.7 (2026-03-01)
Min/Max +/- allowed 147.6
Standard rating
Rating 1255.9
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 1198.1
Final +/- 0
New Rating
()
Rating 1255.9
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 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
2 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
3 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
4 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
5 George Trials 1 2026 (U9 Girls) Standard 2026-01-31 2026-01-31 Eden (WEG) 5 1232 5 3 1379.5 8.7 Details
6 Voories Skaaktoernooi 2025 (O7) Rapid 2025-11-08 2025-11-08 Eden (WEG) 5 1220.7 5 2.5 1313.1 6.3 Details
7 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
8 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
9 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 24
Wins 12
Draws 1
Losses 11
White 10
Black 14
White wins 5
Black wins 7
Score 12.5
Percent 52.1
Dp 17.7
AOR 1249.4
Performance 1267.1
Game statistics (History)
Games 43
Wins 20
Draws 2
Losses 21
White 19
Black 24
White wins 9
Black wins 11
Score 21
Percent 48.8
Dp -9.9
AOR 1246.6
Performance 1236.7
Rankings (Main)
National
Overall 8767
Gender 1701
Age group 437
Gender/Age 113
Provincial
Overall 2516
Gender 577
Age group 172
Gender/Age 49
Regional
Overall 604
Gender 156
Age group 61
Gender/Age 20
Rankings (Standard)
National
Overall 7456
Gender 1533
Age group 396
Gender/Age 107
Provincial
Overall 2120
Gender 539
Age group 154
Gender/Age 48
Regional
Overall 570
Gender 162
Age group 65
Gender/Age 22
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 24
Score 12.5
Percent 52.1
Aor 1249.4
Dp 17.7
Prat 1267.1
Performance (12 months)
Games 34
Score 18
Percent 52.9
Aor 1255.9
Dp 25
Prat 1280.9
Performance (History)
Games 43
Score 21
Percent 48.8
Aor 1246.6
Dp -9.9
Prat 1236.7
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 Stoffels, Z (Zarah) 2 0 2 George Schools Chess Trials 1 2025 (U7 Gils) Eden Chess Trials 2 2026 (U10 Girls) Details
Overall 4 Maarman, R (Ryleigh) 2 1 1 Western Cape Schools - Top Schools 2025 (U7) George Trials 2 2026 (U9 Girls) Details
Overall 5 Anthony, A (Avia) 2 2 0 George Schools Chess Trials 3 2025 (U7 Girls) Voories Skaaktoernooi 2025 (O7) 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 Stoffels, Z (Zarah) 2 0 2 George Schools Chess Trials 1 2025 (U7 Gils) Eden Chess Trials 2 2026 (U10 Girls) Details
Standard 3 Rostoll, C (Chante) 2 2 0 George Schools Chess Trials 1 2025 (U7 Gils) George Schools Chess Trials 3 2025 (U7 Girls) Details
Standard 4 Maarman, R (Ryleigh) 2 1 1 Western Cape Schools - Top Schools 2025 (U7) George Trials 2 2026 (U9 Girls) Details
Standard 5 Ruiters, Z (Zayaan) 2 0 2 George Schools Chess Trials 3 2025 (U7 Girls) Eden Schools Trials 1 2026 (U9 Girls) Details