A king in a vulnerable position, typically on or near the back rank, with limited defensive resources and exposed to a mating threat.
SAE concept sae_28176 fires when a king in a vulnerable position, typically on or near the back rank, with limited defensive resources and exposed to a mating threat.. It appears in 1,159 of 9,950 Climbchess puzzles (11.6%), spanning ELO 639–2658 (median 1624).
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This page documents A king in a vulnerable position, typically on or…, 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:
A king in a vulnerable position, typically on or near the back rank, with limited defensive resources and exposed to a mating threat.
This pattern fires in 1,159 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 639 to 2658, with a median rating of 1624. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_28176 |
|---|---|
| Puzzles where it fires | 1,159 |
| Min ELO | 639 |
| Median ELO | 1624 |
| Max ELO | 2658 |
| Coverage | 11.65% 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 zy3cc_M — ELO 639, themes: advantage, discoveredAttack, endgame, side to move: Black
- Puzzle zs2pp — ELO 923, themes: advantage, deflection, discoveredAttack, side to move: Black
- Puzzle zzr60_F — ELO 1215, themes: advantage, hangingPiece, middlegame, side to move: Black
- Puzzle zolAB_F — ELO 1361, themes: attraction, crushing, discoveredAttack, side to move: White
- Puzzle zzg77_M — ELO 1491, themes: advantage, endgame, short, side to move: Black
- Puzzle zcAWl_F — ELO 1624, themes: clearance, crushing, deflection, side to move: White
- Puzzle zeSAU — ELO 1805, themes: advantage, hangingPiece, master, side to move: White
- Puzzle yzTAz_F — ELO 1969, themes: advantage, endgame, fork, side to move: White
- Puzzle 00lvf_F — ELO 2122, themes: advantage, long, middlegame, side to move: Black
- Puzzle zuSZJ_M — ELO 2359, themes: advancedPawn, crushing, kingsideAttack, 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_28176?
A king in a vulnerable position, typically on or near the back rank, with limited defensive resources and exposed to a mating threat. 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 1,159 tagged puzzles (11.6% of the set), spanning Lichess ELO 639 to 2658 with a median of 1624.
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.