Format
KS
Kostolansky, Sebastian Lukas
IM🇸🇰FIDE 14950596· Male· Slovakia· Born in 2006
Follow Sebastian Lukas KostolanskyTrack his monthly FIDE ratings, games, tournaments and more.
Sebastian Lukas Kostolansky, a 20-year-old Slovak International Master, is rated 2427 — just 17 short of his peak of 2444 (Nov 2025, age 19) and ranked 11th among Slovak players, and in the top 1% worldwide. He is on a steady climb with +25 Elo over the past 12 months. 69 rated games in the past year (≈64/year long-term). Recent standard appearances include 2026 NY Marshall Winter Invitational - IM C, 2026 Pan-American Intercollegiate Championship, and 2025 Cornerstone Thanksgiving Invitationals - IM A. He reached Slovak #9 in Mar 2026.
Awarded IM in 2023 (age 17) and FM in 2018 (age 12). Earned a GM norm at 2025 National Open. At junior level, he reached World #46 in U20, World #42 in U18, World #23 in U16, World #10 in U14, World #6 in U12 and World #8 in U10.
Current rating
2427
Standard
Rpd2313·Blz2244
All-time high
2444
−17 pts below
Nov 2025 · age 19
Nov 2025 · age 19
Activity
51
games / yr avg. · ≈4/mo
69 past 12 mo · ≈6/mo
classical only
Active
classical only
Active
Signature stat
#11
#11 · Slovak players · of 3,025
Career timeline
28 entries2026
Peak Slovak rank: #9
at age 20 · rated 2427
Mar 2026
2025
All-time peak 2444
at age 19 · −17 from today
Nov 2025
46th U20 player worldwide
at age 19 · rated 2437
Jul 2025
2023
42nd U18 player worldwide
at age 17 · rated 2425
Aug 2023
IM title awardedIM
at age 17 · 2023 2nd FIDE Council
Aug 2023
Re-crossed 2400
at age 17
May 2023
Standard rating history
Activity & highlights
Evolution
+11
2416 → 2427
Tournaments
8
60 games
Score
41.5/ 6069.2%
30W23D7L
Top 3 wins
Top 3 losses
Last 12 months — tournaments
8 events| Event | Date | Score | Rank | Perf | Δ Elo |
|---|---|---|---|---|---|
Round-Robin | Jan 2026 | 6.5/9 | #2 | 2438 | +1.5 |
Open Swiss | Jan 2026 | 3/5 | #65 | 2351 | -3.2 |
Round-Robin | Nov 2025 | 5.5/9 | #3 | 2292 | -14.3 |
Team | Oct 2025 | 2/4 | #16 | 2484 | +2.4 |
Open Swiss | Aug 2025 | 5/6 | #2 | 2505 | +7.7 |
Round-Robin | Jul 2025 | 7/9 | #1 | 2435 | +1.4 |
Open Swiss | Jul 2025 | 6/9 | #27 | 2371 | -5.4 |
Open Swiss | Jun 2025 | 6.5/9 | #5 | 2591 | +22.0 |
Most-Played Opponents
vsSamir SahidiIM
🇸🇰SVK·2491
+4 −11 =13
28 games·last met Jun 2024
View head-to-head →
vsMartin JablonickyIM
🇸🇰SVK·2358
+2 −3 =8
13 games·last met Jul 2023
View head-to-head →
vsMilan PacherGM
🇸🇰SVK·2298
+3 −5 =4
12 games·last met Jul 2023
View head-to-head →
vsSimon RybkaFM
🇸🇰SVK·2354
+9 −0 =2
11 games·last met Jul 2024
View head-to-head →
vsSimon Salgovic
🇸🇰SVK·2157
+7 −1 =1
9 games·last met Jun 2021
View head-to-head →
Rankings
/
Slovakia
#11
out of 3,170 players
Europe
#784
in continent
World
#1,274
out of 400,000+
National ranking
Europe & World
Europe
World
Slovakia
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