A black queen on a central or open file, not attacked by white pieces, with at least one friendly piece nearby.
SAE concept sae_4199 fires when a black queen on a central or open file, not attacked by white pieces, with at least one friendly piece nearby.. It appears in 4,317 of 9,950 Climbchess puzzles (43.4%), spanning ELO 610–2697 (median 1624).
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This page documents A black queen on a central or open file, not…, 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:
A black queen on a central or open file, not attacked by white pieces, with at least one friendly piece nearby.
This pattern fires in 4,317 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 610 to 2697, with a median rating of 1624. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_4199 |
|---|---|
| Puzzles where it fires | 4,317 |
| Min ELO | 610 |
| Median ELO | 1624 |
| Max ELO | 2697 |
| Coverage | 43.39% 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 zrPJf — ELO 860, themes: endgame, exposedKing, long, side to move: Black
- Puzzle zyvr0 — ELO 1051, themes: kingsideAttack, mate, mateIn1, side to move: Black
- Puzzle zz52z — ELO 1248, themes: crushing, fork, opening, side to move: White
- Puzzle yCOvy — ELO 1447, themes: doubleBishopMate, kingsideAttack, mate, side to move: White
- Puzzle zcAWl_M — ELO 1624, themes: clearance, crushing, deflection, side to move: Black
- Puzzle xK8TV_F — ELO 1827, themes: backRankMate, deflection, endgame, side to move: White
- Puzzle zHDHG — ELO 2024, themes: endgame, mate, mateIn1, side to move: White
- Puzzle zxZMI_M — ELO 2217, themes: advantage, clearance, discoveredAttack, side to move: Black
- Puzzle zzbdo_M — ELO 2444, themes: crushing, master, 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_4199?
A black queen on a central or open file, not attacked by white pieces, with at least one friendly piece nearby. 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 4,317 tagged puzzles (43.4% of the set), spanning Lichess ELO 610 to 2697 with a median of 1624.
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.