Black king on e8 with key adjacent squares defended by black pieces and no white attackers.
SAE concept sae_5459 fires when black king on e8 with key adjacent squares defended by black pieces and no white attackers.. It appears in 41 of 9,950 Climbchess puzzles (0.4%), spanning ELO 650–2676 (median 1968).
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This page documents Black king on e8 with key adjacent squares…, 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 on e8 with key adjacent squares defended by black pieces and no white attackers.
This pattern fires in 41 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 650 to 2676, with a median rating of 1968. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_5459 |
|---|---|
| Puzzles where it fires | 41 |
| Min ELO | 650 |
| Median ELO | 1968 |
| Max ELO | 2676 |
| Coverage | 0.41% 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 zqC5Y — ELO 650, themes: hangingPiece, mate, mateIn1, side to move: Black
- Puzzle 01GXf_F — ELO 1126, themes: crushing, endgame, fork, side to move: White
- Puzzle zndUa_F — ELO 1204, themes: backRankMate, long, mate, side to move: White
- Puzzle zxCNN_F — ELO 1480, themes: advantage, middlegame, pin, side to move: Black
- Puzzle 01iYr_F — ELO 1611, themes: crushing, middlegame, short, side to move: White
- Puzzle zbalK_F — ELO 1968, themes: advantage, clearance, long, side to move: Black
- Puzzle zy5ec_F — ELO 2062, themes: crushing, long, middlegame, side to move: Black
- Puzzle zwwzr_F — ELO 2181, themes: crushing, fork, middlegame, side to move: White
- Puzzle 01xdR_F — ELO 2322, themes: crushing, long, middlegame, side to move: Black
- Puzzle xf87P_F — ELO 2412, themes: advantage, master, 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_5459?
Black king on e8 with key adjacent squares defended by black pieces and no white attackers. 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 41 tagged puzzles (0.4% of the set), spanning Lichess ELO 650 to 2676 with a median of 1968.
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.