Detects a king on a square with few (0-2) friendly defenders and no enemy attackers, typically cornered and facing imminent mate.
SAE concept sae_23934 fires when detects a king on a square with few (0-2) friendly defenders and no enemy attackers, typically cornered and facing imminent mate.. It appears in 1,813 of 9,950 Climbchess puzzles (18.2%), spanning ELO 610–2698 (median 1466).
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This page documents Detects a king on a square with few (0-2)…, 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:
Detects a king on a square with few (0-2) friendly defenders and no enemy attackers, typically cornered and facing imminent mate.
This pattern fires in 1,813 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 610 to 2698, with a median rating of 1466. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_23934 |
|---|---|
| Puzzles where it fires | 1,813 |
| Min ELO | 610 |
| Median ELO | 1466 |
| Max ELO | 2698 |
| Coverage | 18.22% 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 zXEls — ELO 610, themes: mate, mateIn1, oneMove, side to move: White
- Puzzle zLyPG_M — ELO 802, themes: doubleBishopMate, kingsideAttack, mate, side to move: Black
- Puzzle xKGoC_F — ELO 899, themes: endgame, epauletteMate, hookMate, side to move: Black
- Puzzle kxMjO — ELO 1027, themes: doubleBishopMate, endgame, mate, side to move: White
- Puzzle 77B2N_F — ELO 1212, themes: doubleBishopMate, endgame, mate, side to move: White
- Puzzle yy3Gx — ELO 1466, themes: endgame, hookMate, mate, side to move: White
- Puzzle zxEtJ — ELO 1661, themes: endgame, long, mate, side to move: Black
- Puzzle lpfBX — ELO 1888, themes: mate, mateIn1, middlegame, side to move: White
- Puzzle zx6ya_F — ELO 2152, themes: crushing, discoveredAttack, discoveredCheck, side to move: Black
- Puzzle zvyFt — ELO 2370, themes: endgame, long, mate, 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_23934?
Detects a king on a square with few (0-2) friendly defenders and no enemy attackers, typically cornered and facing imminent mate. 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 1,813 tagged puzzles (18.2% of the set), spanning Lichess ELO 610 to 2698 with a median of 1466.
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.