A square attacked by at least one black piece and zero white pieces, often near the white king or a white queen.
SAE concept sae_24253 fires when a square attacked by at least one black piece and zero white pieces, often near the white king or a white queen.. It appears in 35 of 9,950 Climbchess puzzles (0.4%), spanning ELO 676–2418 (median 1644).
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This page documents A square attacked by at least one black piece…, 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 square attacked by at least one black piece and zero white pieces, often near the white king or a white queen.
This pattern fires in 35 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 676 to 2418, with a median rating of 1644. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_24253 |
|---|---|
| Puzzles where it fires | 35 |
| Min ELO | 676 |
| Median ELO | 1644 |
| Max ELO | 2418 |
| Coverage | 0.35% 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 zzlXr — ELO 676, themes: crushing, endgame, fork, side to move: White
- Puzzle 01R6L_F — ELO 835, themes: endgame, mate, mateIn1, side to move: Black
- Puzzle zz6mG — ELO 948, themes: endgame, hangingPiece, mate, side to move: Black
- Puzzle 00xWX — ELO 1145, themes: crushing, endgame, queenEndgame, side to move: Black
- Puzzle zvPgZ_F — ELO 1508, themes: attraction, kingsideAttack, long, side to move: Black
- Puzzle rfuxq_F — ELO 1644, themes: arabianMate, endgame, mate, side to move: White
- Puzzle zEr24 — ELO 1891, themes: hookMate, kingsideAttack, master, side to move: Black
- Puzzle ziCkd — ELO 2020, themes: mate, mateIn2, middlegame, side to move: Black
- Puzzle zz3th — ELO 2335, themes: crushing, defensiveMove, endgame, side to move: White
- Puzzle zw5sB_M — ELO 2342, themes: endgame, long, 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_24253?
A square attacked by at least one black piece and zero white pieces, often near the white king or a white queen. 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 35 tagged puzzles (0.4% of the set), spanning Lichess ELO 676 to 2418 with a median of 1644.
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.