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Pterodactyl Defense: Eastern, Anhanguera

186K games from Lichess · Updated January 2026

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Analyze this line move by move

White expected score · All ratings · All speeds

50.0%

45%55%
Floor49.8%

the worst score you would still get, 90% confident. At best 50.2%.

Measured over 186K games at this level and clock.

Playablewins about as often as it loses at this level

Roughly even — the middlegame decides more than this opening choice does.

Outcomes for White

Draw 3.8 · Score = win + ½ of the draws · 186K games

Rank among the families White can choose here
not ranked — this is a variation, not a family
Games in this context
186K
Best context
54.3% at 1200-1399 Blitz
Worst context
47.7% at 1200-1399 Bullet
Average game length
35 moves
Games that end decisively
96.2%
Draws
3.8%

Best and worst are the strongest and weakest squares with at least 500 games behind them. The table further down shows every square, including thinner ones.

Extra Analysis

Deep-dive datasets for this opening

Time-Control Swing

Max swing: 11.1% · Classical best · Blitz worst

Where it holds · White score by rating × clock

Green is clearly ahead for White, grey is around even, red is behind. Tap a cell to measure there, and again to clear. It holds about the same all the way up, near 52.0%.

RatingUBBulleBlitzRapidClass
0-999——
1000-1199—
1200-1399
1400-1599
1600-1799
1800-1999
2000-2199
2200-2499
2500+—

Expected score matrix by rating bracket and time control

  • 0-999 rating, Bullet: 48.7% expected score (38 games)
  • 0-999 rating, Blitz: 40.1% expected score (59 games)
  • 0-999 rating, Rapid: 67.3% expected score (13 games)
  • 1000-1199 rating, UltraBullet: 30.0% expected score (1 games)
  • 1000-1199 rating, Bullet: 53.4% expected score (195 games)
  • 1000-1199 rating, Blitz: 56.7% expected score (165 games)
  • 1000-1199 rating, Rapid: 35.5% expected score (40 games)
  • 1200-1399 rating, UltraBullet: 29.0% expected score (8 games)
  • 1200-1399 rating, Bullet: 47.7% expected score (607 games)
  • 1200-1399 rating, Blitz: 54.3% expected score (583 games)
  • 1200-1399 rating, Rapid: 50.4% expected score (113 games)
  • 1200-1399 rating, Classical: 76.7% expected score (6 games)
  • 1400-1599 rating, UltraBullet: 49.2% expected score (63 games)
  • 1400-1599 rating, Bullet: 48.6% expected score (1,713 games)
  • 1400-1599 rating, Blitz: 51.1% expected score (1,799 games)
  • 1400-1599 rating, Rapid: 52.5% expected score (362 games)
  • 1400-1599 rating, Classical: 43.6% expected score (14 games)
  • 1600-1799 rating, UltraBullet: 55.9% expected score (212 games)
  • 1600-1799 rating, Bullet: 48.7% expected score (4,881 games)
  • 1600-1799 rating, Blitz: 49.7% expected score (5,434 games)
  • 1600-1799 rating, Rapid: 52.0% expected score (926 games)
  • 1600-1799 rating, Classical: 66.0% expected score (36 games)
  • 1800-1999 rating, UltraBullet: 48.3% expected score (87 games)
  • 1800-1999 rating, Bullet: 49.3% expected score (15,027 games)
  • 1800-1999 rating, Blitz: 51.0% expected score (14,035 games)
  • 1800-1999 rating, Rapid: 51.1% expected score (1,580 games)
  • 1800-1999 rating, Classical: 59.3% expected score (58 games)
  • 2000-2199 rating, UltraBullet: 62.6% expected score (70 games)
  • 2000-2199 rating, Bullet: 49.3% expected score (31,100 games)
  • 2000-2199 rating, Blitz: 49.4% expected score (19,941 games)
  • 2000-2199 rating, Rapid: 53.5% expected score (1,646 games)
  • 2000-2199 rating, Classical: 60.2% expected score (43 games)
  • 2200-2499 rating, UltraBullet: 45.6% expected score (44 games)
  • 2200-2499 rating, Bullet: 49.8% expected score (52,575 games)
  • 2200-2499 rating, Blitz: 50.6% expected score (11,710 games)
  • 2200-2499 rating, Rapid: 54.2% expected score (657 games)
  • 2200-2499 rating, Classical: 77.3% expected score (15 games)
  • 2500+ rating, UltraBullet: 46.3% expected score (12 games)
  • 2500+ rating, Bullet: 51.2% expected score (19,586 games)
  • 2500+ rating, Blitz: 52.9% expected score (648 games)
  • 2500+ rating, Rapid: 59.7% expected score (14 games)

Related Openings

Parent
Pterodactyl Defense
44.0%
Variations (5)
Pterodactyl Defense: Queen Pterodactyl, Quiet Line
47.7%
Pterodactyl Defense: Eastern, Benoni
49.3%
Pterodactyl Defense: Western, Rhamphorhynchus
48.0%
Pterodactyl Defense: Eastern, Rhamphorhynchus
51.1%
Pterodactyl Defense: Sicilian, Rhamphorhynchus
49.0%
Analyze Pterodactyl Defense: Eastern, Anhanguera PositionsSee what each move is worth at your rating, move by move

Methodology

Across every rating and clock, the Pterodactyl Defense: Eastern, Anhanguera scores 50.0% for White — we are 90% confident the real figure is between 49.8% and 50.2% — from 186K Lichess games. Win rate, draw rate and loss rate come from games played December 2023 to November 2025.

How the figures are made
Whose games these are
186K+ rated games played on Lichess (2023-12 to 2025-11). The games are Lichess’s and free for anyone to use. What is ours is the reading of them. Last rebuilt January 2026.
Which games we count
  • Rated games only — nothing casual.
  • Both players within 200 rating points of each other. A mismatch tells you about the gap, not about the opening.
  • At least 2 moves played.
  • A game is filed under White’s rating.
Why every number comes with a range
A number off a few hundred games is a guess. The same number off millions is a fact. The range is what tells them apart, and it is what the lists rank on — so an opening cannot reach the top on a lucky run of forty games. The more games behind a figure, the narrower its range.
How much we need before we say anything
An opening page needs 100 games. A gambit needs 50 games at a rating before we will say whether it pays there. The chaos and trap lists need 500 games overall and 250 games at one rating or clock.

Frequently Asked Questions

What is the Pterodactyl Defense: Eastern, Anhanguera win rate?

Playing the Pterodactyl Defense: Eastern, Anhanguera, White wins 48.1%, draws 3.8% and loses 48.1%. Counting a draw as half a point, that is an Expected Score of 50.0%. It rests on 186K rated games from Lichess.

At what rating does the Pterodactyl Defense: Eastern, Anhanguera perform best?

The Pterodactyl Defense: Eastern, Anhanguera performs best for White at 2500+, with an Expected Score of 51.3% (20K games) and the highest Floor of any rating with enough games to read.

Is the Pterodactyl Defense: Eastern, Anhanguera better in blitz or rapid?

For White, the Pterodactyl Defense: Eastern, Anhanguera scores higher in Rapid: an Expected Score of 50.2% in Blitz (54K games) against 52.4% in Rapid (5.4K games).

How sharp is the Pterodactyl Defense: Eastern, Anhanguera?

The Pterodactyl Defense: Eastern, Anhanguera has a sharpness score of 96.2 (very decisive), meaning 96.2% of games end decisively. Average game length is 35 moves.

What is the Pterodactyl Defense: Eastern, Anhanguera win rate at 0-999?

At 0-999, White wins 45.3%, draws 2.2% and loses 52.5%. Counting a draw as half a point, that is an Expected Score of 46.4%. It rests on 110 Lichess games, which average 23 moves.

What is the Pterodactyl Defense: Eastern, Anhanguera win rate at 1000-1199?

At 1000-1199, White wins 51.8%, draws 1.9% and loses 46.3%. Counting a draw as half a point, that is an Expected Score of 52.8%. It rests on 401 Lichess games, which average 25 moves.

What is the Pterodactyl Defense: Eastern, Anhanguera win rate at 1200-1399?

At 1200-1399, White wins 50.1%, draws 1.6% and loses 48.4%. Counting a draw as half a point, that is an Expected Score of 50.9%. It rests on 1.3K Lichess games, which average 27 moves.

What is the Pterodactyl Defense: Eastern, Anhanguera win rate at 1400-1599?

At 1400-1599, White wins 48.9%, draws 2.4% and loses 48.7%. Counting a draw as half a point, that is an Expected Score of 50.1%. It rests on 4.0K Lichess games, which average 28 moves.

What is the Pterodactyl Defense: Eastern, Anhanguera win rate at 1600-1799?

At 1600-1799, White wins 48.2%, draws 2.7% and loses 49.1%. Counting a draw as half a point, that is an Expected Score of 49.6%. It rests on 11K Lichess games, which average 31 moves.

What is the Pterodactyl Defense: Eastern, Anhanguera win rate at 1800-1999?

At 1800-1999, White wins 48.7%, draws 3.0% and loses 48.3%. Counting a draw as half a point, that is an Expected Score of 50.2%. It rests on 31K Lichess games, which average 32 moves.

What is the Pterodactyl Defense: Eastern, Anhanguera win rate at 2000-2199?

At 2000-2199, White wins 47.7%, draws 3.6% and loses 48.7%. Counting a draw as half a point, that is an Expected Score of 49.5%. It rests on 53K Lichess games, which average 34 moves.

What is the Pterodactyl Defense: Eastern, Anhanguera win rate at 2200-2499?

At 2200-2499, White wins 47.9%, draws 4.2% and loses 47.9%. Counting a draw as half a point, that is an Expected Score of 50.0%. It rests on 65K Lichess games, which average 36 moves.

What is the Pterodactyl Defense: Eastern, Anhanguera win rate at 2500+?

At 2500+, White wins 48.3%, draws 5.9% and loses 45.8%. Counting a draw as half a point, that is an Expected Score of 51.3%. It rests on 20K Lichess games, which average 40 moves.

What is the Pterodactyl Defense: Eastern, Anhanguera win rate in UltraBullet?

In UltraBullet, White wins 51.5%, draws 2.9% and loses 45.6%. Counting a draw as half a point, that is an Expected Score of 53.0%. It rests on 497 Lichess games.

What is the Pterodactyl Defense: Eastern, Anhanguera win rate in Bullet?

In Bullet, White wins 48.0%, draws 3.5% and loses 48.5%. Counting a draw as half a point, that is an Expected Score of 49.8%. It rests on 126K Lichess games.

What is the Pterodactyl Defense: Eastern, Anhanguera win rate in Blitz?

In Blitz, White wins 48.0%, draws 4.4% and loses 47.6%. Counting a draw as half a point, that is an Expected Score of 50.2%. It rests on 54K Lichess games.

What is the Pterodactyl Defense: Eastern, Anhanguera win rate in Rapid?

In Rapid, White wins 49.9%, draws 4.9% and loses 45.2%. Counting a draw as half a point, that is an Expected Score of 52.4%. It rests on 5.4K Lichess games.

What is the Pterodactyl Defense: Eastern, Anhanguera win rate in Classical?

In Classical, White wins 59.1%, draws 6.6% and loses 34.3%. Counting a draw as half a point, that is an Expected Score of 62.4%. It rests on 172 Lichess games.

Is the Pterodactyl Defense: Eastern, Anhanguera a good opening?

The Pterodactyl Defense: Eastern, Anhanguera is about level. Across all ratings, White wins 48.1% of its games and loses 48.1%. It performs best at 2500+. Your results depend on your rating, time control, and how well you know the typical plans.