This feature detects a white queen on a square where it is not attacked by black pieces, and where it is the only white piece attacking that square.
SAE concept sae_27871 fires when this feature detects a white queen on a square where it is not attacked by black pieces, and where it is the only white piece attacking that square.. It appears in 3,771 of 9,950 Climbchess puzzles (37.9%), spanning ELO 610–2698 (median 1678).
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This page documents This feature detects a white queen on a square…, one of 4,505 interpretable chess concepts extracted from Leela Chess Zero via sparse autoencoders. The full feature description from our SAE labelling pipeline reads:
This feature detects a white queen on a square where it is not attacked by black pieces, and where it is the only white piece attacking that square.
This pattern fires in 3,771 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 610 to 2698, with a median rating of 1678. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_27871 |
|---|---|
| Puzzles where it fires | 3,771 |
| Min ELO | 610 |
| Median ELO | 1678 |
| Max ELO | 2698 |
| Coverage | 37.90% of puzzle set |
Related concepts
The five concepts most often co-firing alongside this one (Jaccard similarity over the puzzle co-occurrence graph) are:
Example puzzles
Below are 10 puzzles spanning the rating distribution. Each links to its own page with full move list and related concepts.
- Puzzle xRhy5 — ELO 610, themes: advantage, endgame, master, side to move: Black
- Puzzle yb1cQ_F — ELO 894, themes: clearance, endgame, mate, side to move: White
- Puzzle zeoXV — ELO 1120, themes: attraction, crushing, deflection, side to move: White
- Puzzle ziV0u_F — ELO 1323, themes: advantage, fork, interference, side to move: White
- Puzzle 00uzT — ELO 1507, themes: advantage, long, middlegame, side to move: White
- Puzzle zv8g7_F — ELO 1678, themes: crushing, endgame, master, side to move: White
- Puzzle zymYs_F — ELO 1885, themes: crushing, long, middlegame, side to move: White
- Puzzle zySyD_M — ELO 2081, themes: advantage, discoveredAttack, fork, side to move: White
- Puzzle zhoDa — ELO 2262, themes: advantage, long, middlegame, side to move: Black
- Puzzle zyAu2 — ELO 2472, themes: advantage, fork, middlegame, side to move: Black
How to use this page
If you want to train this pattern, open the Climbchess trainer and filter for puzzles tagged with this concept. The trainer surfaces them at the right difficulty for your current rating, and tracks how often you spot the cue versus miss it. You can also browse the related concepts above to see neighbouring ideas in feature space.
Climbchess concepts are not heuristics written by a human author. Each one corresponds to a single direction in the residual stream of Leela Chess Zero that activates on a specific board feature, then was labelled by reading the top-activating positions. This makes the catalogue exhaustive (every Leela-detectable pattern is in here somewhere) and falsifiable (you can replay our extraction).
Frequently asked
What is SAE concept sae_27871?
This feature detects a white queen on a square where it is not attacked by black pieces, and where it is the only white piece attacking that square. It is one of 4,505 interpretable features extracted from Leela Chess Zero's residual stream via sparse autoencoders, then labelled by reading the top-activating positions.
Where does this pattern appear?
In 3,771 tagged puzzles (37.9% of the set), spanning Lichess ELO 610 to 2698 with a median of 1678.
How do I train it?
Open the Climbchess trainer and filter for puzzles tagged with this concept. The trainer adapts difficulty using your live recognition profile and tracks how often you spot the cue versus miss it.
Is it free?
Yes. Climbchess is free forever, with no account, email, or signup required. You can delete your data at any time.