Detects a black rook on or near its starting square in an endgame, often contesting a back rank or open file against white's attacking pieces.
SAE concept sae_25982 fires when detects a black rook on or near its starting square in an endgame, often contesting a back rank or open file against white's attacking pieces.. It appears in 44 of 9,950 Climbchess puzzles (0.4%), spanning ELO 688–2536 (median 1194).
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This page documents Detects a black rook on or near its starting…, 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 black rook on or near its starting square in an endgame, often contesting a back rank or open file against white's attacking pieces.
This pattern fires in 44 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 688 to 2536, with a median rating of 1194. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_25982 |
|---|---|
| Puzzles where it fires | 44 |
| Min ELO | 688 |
| Median ELO | 1194 |
| Max ELO | 2536 |
| Coverage | 0.44% 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 zutuc_M — ELO 688, themes: endgame, long, mate, side to move: White
- Puzzle st8SM_M — ELO 724, themes: crushing, endgame, interference, side to move: Black
- Puzzle zzlB3_F — ELO 870, themes: endgame, mate, mateIn2, side to move: Black
- Puzzle zw7Eb — ELO 920, themes: advantage, endgame, master, side to move: White
- Puzzle zysAd — ELO 1184, themes: advancedPawn, crushing, endgame, side to move: Black
- Puzzle zwand_M — ELO 1194, themes: advancedPawn, crushing, endgame, side to move: White
- Puzzle 02551 — ELO 1408, themes: advantage, endgame, quietMove, side to move: Black
- Puzzle zyded_F — ELO 1536, themes: attraction, crushing, endgame, side to move: White
- Puzzle zwd4v_F — ELO 1758, themes: endgame, epauletteMate, master, side to move: Black
- Puzzle zzHWv — ELO 2389, themes: advantage, defensiveMove, endgame, 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_25982?
Detects a black rook on or near its starting square in an endgame, often contesting a back rank or open file against white's attacking pieces. 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 44 tagged puzzles (0.4% of the set), spanning Lichess ELO 688 to 2536 with a median of 1194.
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.