A square in the central pawn structure attacked by Black with no White defenders, often a weak pawn or outpost.
SAE concept sae_1882 fires when a square in the central pawn structure attacked by Black with no White defenders, often a weak pawn or outpost.. It appears in 46 of 9,950 Climbchess puzzles (0.5%), spanning ELO 794–2652 (median 1673).
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This page documents A square in the central pawn structure attacked…, 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 in the central pawn structure attacked by Black with no White defenders, often a weak pawn or outpost.
This pattern fires in 46 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 794 to 2652, with a median rating of 1673. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_1882 |
|---|---|
| Puzzles where it fires | 46 |
| Min ELO | 794 |
| Median ELO | 1673 |
| Max ELO | 2652 |
| Coverage | 0.46% 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 zTOrn — ELO 794, themes: crushing, endgame, short, side to move: Black
- Puzzle zxAbw_F — ELO 1004, themes: advantage, endgame, long, side to move: White
- Puzzle zkTZL — ELO 1323, themes: crushing, endgame, pawnEndgame, side to move: White
- Puzzle zyebe_M — ELO 1347, themes: crushing, endgame, pawnEndgame, side to move: White
- Puzzle yzDK2_F — ELO 1415, themes: crushing, endgame, long, side to move: White
- Puzzle zkPWg_M — ELO 1673, themes: crushing, endgame, pawnEndgame, side to move: White
- Puzzle zTwNF — ELO 1795, themes: crushing, endgame, long, side to move: Black
- Puzzle zyc2q_M — ELO 1854, themes: crushing, endgame, long, side to move: White
- Puzzle zfMWD_F — ELO 2018, themes: crushing, defensiveMove, endgame, side to move: White
- Puzzle zjbhj — ELO 2235, themes: crushing, defensiveMove, endgame, 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_1882?
A square in the central pawn structure attacked by Black with no White defenders, often a weak pawn or outpost. 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 46 tagged puzzles (0.5% of the set), spanning Lichess ELO 794 to 2652 with a median of 1673.
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.