The feature detects squares attacked by a black knight, especially when the square is empty and not attacked by white.
SAE concept sae_38690 fires when the feature detects squares attacked by a black knight, especially when the square is empty and not attacked by white.. It appears in 1 of 9,950 Climbchess puzzles (0.0%), spanning ELO 2069–2069 (median 2069).
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This page documents The feature detects squares attacked by a black…, 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:
The feature detects squares attacked by a black knight, especially when the square is empty and not attacked by white.
This pattern fires in 1 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 2069 to 2069, with a median rating of 2069. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_38690 |
|---|---|
| Puzzles where it fires | 1 |
| Min ELO | 2069 |
| Median ELO | 2069 |
| Max ELO | 2069 |
| Coverage | 0.01% 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 1 puzzles spanning the rating distribution. Each links to its own page with full move list and related concepts.
- Puzzle zzm6T_M — ELO 2069, themes: crushing, defensiveMove, 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_38690?
The feature detects squares attacked by a black knight, especially when the square is empty and not attacked by white. 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 1 tagged puzzles (0.0% of the set), spanning Lichess ELO 2069 to 2069 with a median of 2069.
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.