King in an endgame position with no immediate threats, spanning pure pawn endings, rook endings, and minor-piece endings — likely a general 'safe king' feature across endgame types.
SAE concept sae_5208 fires when king in an endgame position with no immediate threats, spanning pure pawn endings, rook endings, and minor-piece endings — likely a general 'safe king' feature across endgame types.. It appears in 1,089 of 9,950 Climbchess puzzles (10.9%), spanning ELO 605–2698 (median 1609).
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This page documents King in an endgame position with no immediate…, 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:
King in an endgame position with no immediate threats, spanning pure pawn endings, rook endings, and minor-piece endings — likely a general 'safe king' feature across endgame types.
This pattern fires in 1,089 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 605 to 2698, with a median rating of 1609. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_5208 |
|---|---|
| Puzzles where it fires | 1,089 |
| Min ELO | 605 |
| Median ELO | 1609 |
| Max ELO | 2698 |
| Coverage | 10.94% 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 yS8nE — ELO 605, themes: crushing, endgame, long, side to move: Black
- Puzzle xNI7h — ELO 833, themes: crushing, defensiveMove, endgame, side to move: White
- Puzzle 01QgT_M — ELO 975, themes: endgame, mate, mateIn2, side to move: Black
- Puzzle xNepc_M — ELO 1182, themes: crushing, endgame, pawnEndgame, side to move: Black
- Puzzle zpo0D_F — ELO 1368, themes: crushing, endgame, pawnEndgame, side to move: Black
- Puzzle ztFQi — ELO 1609, themes: bishopEndgame, crushing, endgame, side to move: White
- Puzzle zoF42 — ELO 1758, themes: crushing, endgame, pawnEndgame, side to move: Black
- Puzzle 01312 — ELO 1969, themes: crushing, defensiveMove, endgame, side to move: Black
- Puzzle Q9obr — ELO 2162, themes: endgame, hookMate, mate, side to move: Black
- Puzzle zz907_M — ELO 2410, themes: advancedPawn, advantage, defensiveMove, 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_5208?
King in an endgame position with no immediate threats, spanning pure pawn endings, rook endings, and minor-piece endings — likely a general 'safe king' feature across endgame types. 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 1,089 tagged puzzles (10.9% of the set), spanning Lichess ELO 605 to 2698 with a median of 1609.
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.