White king on the back rank (c1–h1 range), defended by own pieces, in a tactical endgame or mating sequence.
SAE concept sae_5930 fires when white king on the back rank (c1–h1 range), defended by own pieces, in a tactical endgame or mating sequence.. It appears in 75 of 9,950 Climbchess puzzles (0.8%), spanning ELO 644–2612 (median 1385).
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This page documents White king on the back rank (c1–h1 range)…, 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:
White king on the back rank (c1–h1 range), defended by own pieces, in a tactical endgame or mating sequence.
This pattern fires in 75 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 644 to 2612, with a median rating of 1385. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_5930 |
|---|---|
| Puzzles where it fires | 75 |
| Min ELO | 644 |
| Median ELO | 1385 |
| Max ELO | 2612 |
| Coverage | 0.75% 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 zVlCK — ELO 644, themes: anastasiaMate, endgame, mate, side to move: Black
- Puzzle zJYxP_F — ELO 918, themes: anastasiaMate, mate, mateIn2, side to move: Black
- Puzzle zwyKz_F — ELO 959, themes: attraction, mate, mateIn2, side to move: Black
- Puzzle zcL1i — ELO 1149, themes: anastasiaMate, master, mate, side to move: White
- Puzzle zyF98_F — ELO 1317, themes: exposedKing, long, mate, side to move: White
- Puzzle zzU3k_M — ELO 1385, themes: clearance, kingsideAttack, master, side to move: White
- Puzzle zpPJm — ELO 1511, themes: kingsideAttack, mate, mateIn2, side to move: Black
- Puzzle zgLUW_F — ELO 1711, themes: crushing, discoveredAttack, discoveredCheck, side to move: White
- Puzzle zsCt4_M — ELO 2135, themes: mate, mateIn2, middlegame, side to move: White
- Puzzle oafaf_M — ELO 2441, themes: kingsideAttack, long, mate, 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_5930?
White king on the back rank (c1–h1 range), defended by own pieces, in a tactical endgame or mating sequence. 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 75 tagged puzzles (0.8% of the set), spanning Lichess ELO 644 to 2612 with a median of 1385.
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.