King under direct attack with no defensive pieces nearby, across various endgame material configurations.
SAE concept sae_16177 fires when king under direct attack with no defensive pieces nearby, across various endgame material configurations.. It appears in 19 of 9,950 Climbchess puzzles (0.2%), spanning ELO 858–2351 (median 1086).
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This page documents King under direct attack with no defensive…, 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 under direct attack with no defensive pieces nearby, across various endgame material configurations.
This pattern fires in 19 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 858 to 2351, with a median rating of 1086. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_16177 |
|---|---|
| Puzzles where it fires | 19 |
| Min ELO | 858 |
| Median ELO | 1086 |
| Max ELO | 2351 |
| Coverage | 0.19% 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 zx4cw — ELO 858, themes: advancedPawn, crushing, endgame, side to move: White
- Puzzle zx4cw_F — ELO 858, themes: advancedPawn, crushing, endgame, side to move: Black
- Puzzle zdAkQ — ELO 878, themes: advancedPawn, crushing, endgame, side to move: White
- Puzzle zdAkQ_M — ELO 878, themes: advancedPawn, crushing, endgame, side to move: White
- Puzzle zn7Ji — ELO 1086, themes: crushing, defensiveMove, endgame, side to move: White
- Puzzle zn7Ji_M — ELO 1086, themes: crushing, defensiveMove, endgame, side to move: White
- Puzzle 028i3_F — ELO 1133, themes: advantage, endgame, rookEndgame, side to move: Black
- Puzzle zwxp4 — ELO 1817, themes: crushing, defensiveMove, endgame, side to move: Black
- Puzzle zwxp4_M — ELO 1817, themes: crushing, defensiveMove, endgame, side to move: Black
- Puzzle zyiRr_F — ELO 2351, themes: crushing, defensiveMove, endgame, 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_16177?
King under direct attack with no defensive pieces nearby, across various endgame material configurations. 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 19 tagged puzzles (0.2% of the set), spanning Lichess ELO 858 to 2351 with a median of 1086.
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.