A queen is actively contested — under threat from an enemy piece and relying on a single defender, creating tactical tension.
SAE concept sae_27655 fires when a queen is actively contested — under threat from an enemy piece and relying on a single defender, creating tactical tension.. It appears in 168 of 9,950 Climbchess puzzles (1.7%), spanning ELO 639–2516 (median 1567).
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This page documents A queen is actively contested — under threat…, 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 queen is actively contested — under threat from an enemy piece and relying on a single defender, creating tactical tension.
This pattern fires in 168 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 639 to 2516, with a median rating of 1567. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_27655 |
|---|---|
| Puzzles where it fires | 168 |
| Min ELO | 639 |
| Median ELO | 1567 |
| Max ELO | 2516 |
| Coverage | 1.69% 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 zy3cc — ELO 639, themes: advantage, discoveredAttack, endgame, side to move: Black
- Puzzle znUgd — ELO 859, themes: crushing, discoveredAttack, kingsideAttack, side to move: White
- Puzzle zZ6pr_M — ELO 1146, themes: advantage, attraction, deflection, side to move: Black
- Puzzle zy3iJ — ELO 1241, themes: attraction, crushing, endgame, side to move: White
- Puzzle 00gsT — ELO 1454, themes: crushing, middlegame, short, side to move: White
- Puzzle zzMSU_M — ELO 1567, themes: kingsideAttack, mate, mateIn2, side to move: White
- Puzzle zyPyI_M — ELO 1734, themes: crushing, deflection, endgame, side to move: Black
- Puzzle zOe8h_F — ELO 1887, themes: crushing, middlegame, short, side to move: Black
- Puzzle zgzDk_F — ELO 2081, themes: clearance, endgame, mate, side to move: Black
- Puzzle zyduE_M — ELO 2305, themes: attraction, crushing, endgame, side to move: White
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_27655?
A queen is actively contested — under threat from an enemy piece and relying on a single defender, creating tactical tension. 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 168 tagged puzzles (1.7% of the set), spanning Lichess ELO 639 to 2516 with a median of 1567.
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.