Players
Fiona Sieber
Photo: Stefan64, CC BY-SA 3.0, via Wikimedia Commons
WGM

Fiona Sieber

GermanyBorn 2000 (age 26)FIDE ID 12902373

Luft classical

210022002300240025002023202420252026
Monthly Luft ratings, now 2265
FIDE

FIDE classical

200022002400201620182020202220242026
Monthly FIDE ratings, now 2273
Luft

Flair

Fiona Sieber's classical flairs

2 of 19 earned over the last 12 months

  • Black Belt4½/8 with black (56%), against 44% with white
  • Underdog4 wins against players rated 50+ higher
  • TitanLuft classical rating averaging 2800+ over the last 4 years
  • Serial WinnerWon 2+ elite events in the last 12 months
  • Fortress25+ games in a row without a loss
  • IronmanPlayed 50+ games over the last 12 months
  • RisingAged 18 or under, Luft rating up 40+ over the last 12 months
  • Endgame SpecialistEndgame 90+: converting, saving and not throwing endgames
  • TacticianTactics 90+: sharp, tactical games they made sharp
  • LightningTop 20 at speed chess (mostly blitz, some rapid)
  • Hot StreakAt least 6 points from 7 straight games against strong opposition
  • SignatureSticks to one defence with black far more than most
  • ChameleonPlays a wide range of defences with black
  • WildcardBrilliant one event, off the next: hard to predict
  • ReliableConsistent across all top events
  • FighterRarely draws, and wins far more than they lose
  • AdaptableTactics and Positional both 90+
  • PositionalPositional 90+: slow, quiet games they steered
  • PodiumTop 3 in at least half of their elite events
  • Black Belt
  • Underdog

Trophy cabinet

Fiona Sieber's classical titles

1 classical title, newest first

  • German Championship 20241st
  • German Championship 

Attributes

Tactics 54Positional 64Endgame 70Openings 61Composure 54Defence 62Speed 47Consistency 48

Luft classical rating

2265No. 480

From 16 classical games in top events over the last year, playing at a 2336 level.

ResultsPlayed at a 2336 level, blended with their FIDE rating+5
Tournament winsNone in the last year0
FormThe last 3 months against the whole year−10
ConsistencyHow steady they are from event to event+2
Activity16 classical games in top events−5

Openings

Their most-played, from 28 classical games in top events over the last 4 years

OpeningGamesScore
Sicilian Defense750%
French Defense250%
Ruy Lopez20%
Modern Defense1100%
English Opening150%

Sicilian Defense

With White: 7 games, won 1, drew 5, lost 1 · 50%

VariationGamesScore
Nyezhmetdinov-Rossolimo Attack250%
Moscow Variation1100%
Löwenthal Variation150%
Kalashnikov Variation150%
Pin Variation150%
Godiva Variation10%

French Defense

With White: 2 games, won 0, drew 2, lost 0 · 50%

VariationGamesScore
Tarrasch Variation150%
Advance Variation150%

Ruy Lopez

With White: 2 games, won 0, drew 0, lost 2 · 0%

VariationGamesScore
Morphy Defense10%
Closed10%

Modern Defense

With White: 1 game, won 1, drew 0, lost 0 · 100%

VariationGamesScore
Lizard Defense1100%

English Opening

With White: 1 game, won 0, drew 1, lost 0 · 50%

VariationGamesScore
King's English Variation150%

Sicilian Defense

With Black: 5 games, won 2, drew 0, lost 3 · 40%

VariationGamesScore
Closed250%
Delayed Alapin Variation20%
Chekhover Variation1100%

English Opening

With Black: 3 games, won 0, drew 1, lost 2 · 17%

VariationGamesScore
Agincourt Defense150%
King's English Variation10%
Anglo-Indian Defense10%

Italian Game

With Black: 1 game, won 1, drew 0, lost 0 · 100%

VariationGamesScore
Two Knights Defense1100%

Catalan Opening

With Black: 1 game, won 1, drew 0, lost 0 · 100%

VariationGamesScore
Open Defense1100%

Ruy Lopez

With Black: 1 game, won 0, drew 1, lost 0 · 50%

VariationGamesScore
Open150%

Recent events

See all
EventPlace+/−+/−
German Bundesliga 2026/274 Oct 2026½/1−1−1
25th European Chess Championship 20265 Jun 2026=30th+49+49
German Bundesliga 2025/2618 Apr 20262/6−5−4
German Championships & Masters 202425 Aug 20242½/3+26+24
German Masters der Frauen 202318 Dec 20231½/8−41−40

Best wins

OpponentRating
IMR. Padmini30 Apr 2023 · Bundesliga 20222390
IMS. Milliet3 Jun 2026 · 25th European Chess Championship 20262373
WGMH. Klek30 Nov 2025 · German Bundesliga 2025/262357
IMM. Brunello28 May 2026 · 25th European Chess Championship 20262346
WIMK. Dolzhykova19 Aug 2024 · German Championships & Masters 20242340

Most played

OpponentGamesWDL
WGMH. KlekLast 26 May 2026 · 25th European Chess Championship 20263120
FML. SchulzeLast 25 Aug 2024 · German Championships & Masters 20242101
WGMJ. SafarliLast 18 Apr 2026 · German Bundesliga 2025/262002
IMD. WagnerLast 4 Jun 2026 · 25th European Chess Championship 20262011
IMM. ArabidzeLast 5 Jun 2026 · 25th European Chess Championship 20262002

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How attributes are calculated

From their games in top events over the last 12 months, each judged against the opponent's rating

  • TacticsHow well they score in sharp games they chose to make sharp.
  • PositionalHow well they score in quiet, manoeuvring games they steered.
  • EndgameHow they do in endgames against what the position promised when it began: converting a winning one earns a little, saving a losing one earns a lot, and throwing a winning one costs a lot.
  • OpeningsThe engine's verdict on their position around moves 15 to 20, against what's normal for that colour, as the score it points to. Over the last 4 years, with older games counting less.
  • ComposureHow well they score under pressure: the game straight after a loss, and the last 3 games of an event while they can still win it. Over the last 4 years.
  • DefenceHow they do in games where they were 0.8 pawns or more worse after move 18, against what that position usually scores: holding the draw earns, turning it around earns more, and losing costs a little.
  • SpeedTheir Luft rapid and blitz ratings. With neither, an estimate a little below their classical level.
  • ConsistencyTheir Luft rating, less their off days: tournaments (5+ games each) over the last 4 years where they played 50+ below it. Anything better never counts against them.

  • "How well they score" is a performance rating: the opponent's rating, plus 400 for a win and minus 400 for a loss, averaged. So it's always judged against who they played.

    The score out of 100: 80 is a 2600 level, and each 13 rating points adds one, so 2860 and up is 100.

    Fair to everyone: with only a few games of a kind, the result leans towards their overall Luft rating. Strengths and weaknesses are measured against their overall level and compared with the top 100, so a specialist's best side stands out. A little recent form is added to all but Speed.