A king on the back rank exposed to at least one enemy attacker with no friendly piece directly defending the king's square.
SAE concept sae_2076 fires when a king on the back rank exposed to at least one enemy attacker with no friendly piece directly defending the king's square.. It appears in 2,330 of 9,950 Climbchess puzzles (23.4%), spanning ELO 610–2696 (median 1585).
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This page documents A king on the back rank exposed to at least one…, 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 on the back rank exposed to at least one enemy attacker with no friendly piece directly defending the king's square.
This pattern fires in 2,330 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 610 to 2696, with a median rating of 1585. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_2076 |
|---|---|
| Puzzles where it fires | 2,330 |
| Min ELO | 610 |
| Median ELO | 1585 |
| Max ELO | 2696 |
| Coverage | 23.42% 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 xRhy5 — ELO 610, themes: advantage, endgame, master, side to move: Black
- Puzzle zze9h_M — ELO 849, themes: kingsideAttack, mate, mateIn1, side to move: White
- Puzzle zxCGr_F — ELO 1008, themes: backRankMate, endgame, hangingPiece, side to move: White
- Puzzle zwBMB_F — ELO 1211, themes: advantage, defensiveMove, endgame, side to move: Black
- Puzzle zzmu6_F — ELO 1421, themes: advancedPawn, advantage, endgame, side to move: White
- Puzzle zjppA — ELO 1585, themes: advantage, long, middlegame, side to move: Black
- Puzzle zx6hI_M — ELO 1809, themes: mate, mateIn2, middlegame, side to move: White
- Puzzle 7eBEC_F — ELO 2007, themes: endgame, long, mate, side to move: Black
- Puzzle zc80c_F — ELO 2185, themes: endgame, mate, mateIn1, side to move: White
- Puzzle UXV0Y — ELO 2409, themes: attraction, hookMate, 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_2076?
A king on the back rank exposed to at least one enemy attacker with no friendly piece directly defending the king's square. 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 2,330 tagged puzzles (23.4% of the set), spanning Lichess ELO 610 to 2696 with a median of 1585.
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.