King on or near the back rank in an endgame with active minor pieces and passed or advanced pawns.
SAE concept sae_911 fires when king on or near the back rank in an endgame with active minor pieces and passed or advanced pawns.. It appears in 117 of 9,950 Climbchess puzzles (1.2%), spanning ELO 671–2586 (median 1160).
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This page documents King on or near the back rank in an endgame with…, 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 on or near the back rank in an endgame with active minor pieces and passed or advanced pawns.
This pattern fires in 117 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 671 to 2586, with a median rating of 1160. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_911 |
|---|---|
| Puzzles where it fires | 117 |
| Min ELO | 671 |
| Median ELO | 1160 |
| Max ELO | 2586 |
| Coverage | 1.18% 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 zh89F — ELO 671, themes: backRankMate, endgame, mate, side to move: White
- Puzzle yqvPr_M — ELO 755, themes: advantage, bishopEndgame, deflection, side to move: White
- Puzzle yHJ1k — ELO 855, themes: advantage, attraction, endgame, side to move: White
- Puzzle zGDfP_F — ELO 991, themes: endgame, hookMate, mate, side to move: Black
- Puzzle zz3Gp — ELO 1061, themes: advantage, endgame, hangingPiece, side to move: White
- Puzzle zxcsE_M — ELO 1160, themes: advantage, master, middlegame, side to move: Black
- Puzzle zv8dc_F — ELO 1330, themes: attraction, crushing, endgame, side to move: White
- Puzzle zhYkR_F — ELO 1465, themes: crushing, endgame, exposedKing, side to move: Black
- Puzzle zzq18 — ELO 2030, themes: crushing, kingsideAttack, long, side to move: Black
- Puzzle JHYam — ELO 2381, themes: anastasiaMate, attraction, mate, 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_911?
King on or near the back rank in an endgame with active minor pieces and passed or advanced pawns. 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 117 tagged puzzles (1.2% of the set), spanning Lichess ELO 671 to 2586 with a median of 1160.
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.