Detects a king on the back rank in a position with active mating threats from an enemy piece, regardless of whether friendly pieces are adjacent.
SAE concept sae_14042 fires when detects a king on the back rank in a position with active mating threats from an enemy piece, regardless of whether friendly pieces are adjacent.. It appears in 406 of 9,950 Climbchess puzzles (4.1%), spanning ELO 668–2668 (median 1512).
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This page documents Detects a king on the back rank in a position…, 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:
Detects a king on the back rank in a position with active mating threats from an enemy piece, regardless of whether friendly pieces are adjacent.
This pattern fires in 406 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 668 to 2668, with a median rating of 1512. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_14042 |
|---|---|
| Puzzles where it fires | 406 |
| Min ELO | 668 |
| Median ELO | 1512 |
| Max ELO | 2668 |
| Coverage | 4.08% 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 zywqE — ELO 668, themes: attackingF2F7, mate, mateIn1, side to move: White
- Puzzle 00f1D_M — ELO 805, themes: kingsideAttack, mate, mateIn1, side to move: Black
- Puzzle zz5rM_M — ELO 916, themes: endgame, hookMate, mate, side to move: Black
- Puzzle zvgCL_M — ELO 1067, themes: anastasiaMate, endgame, mate, side to move: White
- Puzzle zzgY8_F — ELO 1274, themes: crushing, discoveredAttack, discoveredCheck, side to move: White
- Puzzle sm7Ra_F — ELO 1512, themes: kingsideAttack, long, mate, side to move: Black
- Puzzle v2kpd — ELO 1783, themes: arabianMate, discoveredAttack, discoveredCheck, side to move: White
- Puzzle zpxsS — ELO 1987, themes: backRankMate, fork, long, side to move: Black
- Puzzle zsjxJ_M — ELO 2111, themes: advantage, attraction, intermezzo, side to move: Black
- Puzzle fRCrD — ELO 2421, themes: mate, mateIn2, middlegame, 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_14042?
Detects a king on the back rank in a position with active mating threats from an enemy piece, regardless of whether friendly pieces are adjacent. 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 406 tagged puzzles (4.1% of the set), spanning Lichess ELO 668 to 2668 with a median of 1512.
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.