Black king in a late endgame, frequently near the back rank or in a cornered/restricted position, spanning pawn, rook, and minor-piece endings.
SAE concept sae_10213 fires when black king in a late endgame, frequently near the back rank or in a cornered/restricted position, spanning pawn, rook, and minor-piece endings.. It appears in 3,304 of 9,950 Climbchess puzzles (33.2%), spanning ELO 605–2697 (median 1579).
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This page documents Black king in a late endgame, frequently near…, 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:
Black king in a late endgame, frequently near the back rank or in a cornered/restricted position, spanning pawn, rook, and minor-piece endings.
This pattern fires in 3,304 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 605 to 2697, with a median rating of 1579. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_10213 |
|---|---|
| Puzzles where it fires | 3,304 |
| Min ELO | 605 |
| Median ELO | 1579 |
| Max ELO | 2697 |
| Coverage | 33.21% 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 tnwdm — ELO 830, themes: crushing, exposedKing, long, side to move: White
- Puzzle yD58Q_M — ELO 955, themes: arabianMate, endgame, master, side to move: Black
- Puzzle zz3k8_F — ELO 1161, themes: fork, mate, mateIn2, side to move: White
- Puzzle zzuxX_F — ELO 1363, themes: attraction, crushing, deflection, side to move: Black
- Puzzle 01xyH_M — ELO 1579, themes: crushing, middlegame, pin, side to move: White
- Puzzle zziOo_M — ELO 1795, themes: endgame, mate, mateIn2, side to move: Black
- Puzzle zyQVU_F — ELO 2019, themes: advancedPawn, crushing, deflection, side to move: Black
- Puzzle zwkgx — ELO 2212, themes: advantage, middlegame, pin, side to move: White
- Puzzle uuH2Y_F — ELO 2444, themes: advantage, defensiveMove, endgame, 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_10213?
Black king in a late endgame, frequently near the back rank or in a cornered/restricted position, spanning pawn, rook, and minor-piece endings. 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 3,304 tagged puzzles (33.2% of the set), spanning Lichess ELO 605 to 2697 with a median of 1579.
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.