White King near a corner square (a1, h1, a2, h2) in an endgame or mating-net position.
SAE concept sae_27762 fires when white King near a corner square (a1, h1, a2, h2) in an endgame or mating-net position.. It appears in 2,362 of 9,950 Climbchess puzzles (23.7%), spanning ELO 610–2696 (median 1481).
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This page documents White King near a corner square (a1, h1, a2, h2)…, 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:
White King near a corner square (a1, h1, a2, h2) in an endgame or mating-net position.
This pattern fires in 2,362 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 610 to 2696, with a median rating of 1481. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_27762 |
|---|---|
| Puzzles where it fires | 2,362 |
| Min ELO | 610 |
| Median ELO | 1481 |
| Max ELO | 2696 |
| Coverage | 23.74% 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 zzccg — ELO 815, themes: crushing, endgame, long, side to move: Black
- Puzzle zJYxP — ELO 918, themes: anastasiaMate, mate, mateIn2, side to move: White
- Puzzle 00L84_F — ELO 1107, themes: advancedPawn, crushing, endgame, side to move: Black
- Puzzle zzFKT — ELO 1260, themes: attraction, endgame, mate, side to move: Black
- Puzzle zzgS0_M — ELO 1481, themes: endgame, mate, mateIn1, side to move: White
- Puzzle zuSLU — ELO 1686, themes: discoveredAttack, discoveredCheck, master, side to move: Black
- Puzzle x04fe_M — ELO 1893, themes: discoveredAttack, endgame, hookMate, side to move: Black
- Puzzle j9ePJ — ELO 2126, themes: endgame, mate, mateIn1, 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_27762?
White King near a corner square (a1, h1, a2, h2) in an endgame or mating-net position. 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 2,362 tagged puzzles (23.7% of the set), spanning Lichess ELO 610 to 2696 with a median of 1481.
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.