A black rook is under white attack and defended by black, commonly on or near the 8th rank but not restricted to c8 or d8.
SAE concept sae_4805 fires when a black rook is under white attack and defended by black, commonly on or near the 8th rank but not restricted to c8 or d8.. It appears in 82 of 9,950 Climbchess puzzles (0.8%), spanning ELO 798–2470 (median 1784).
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This page documents A black rook is under white attack and defended…, 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 black rook is under white attack and defended by black, commonly on or near the 8th rank but not restricted to c8 or d8.
This pattern fires in 82 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 798 to 2470, with a median rating of 1784. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_4805 |
|---|---|
| Puzzles where it fires | 82 |
| Min ELO | 798 |
| Median ELO | 1784 |
| Max ELO | 2470 |
| Coverage | 0.82% 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 yuxMM — ELO 798, themes: crushing, discoveredAttack, kingsideAttack, side to move: White
- Puzzle zwMAl_F — ELO 908, themes: advantage, discoveredAttack, master, side to move: White
- Puzzle 021YZ — ELO 1229, themes: crushing, discoveredAttack, discoveredCheck, side to move: Black
- Puzzle zu3eF_M — ELO 1398, themes: crushing, master, middlegame, side to move: White
- Puzzle zox1E — ELO 1547, themes: advantage, attraction, master, side to move: Black
- Puzzle 01Z93_F — ELO 1784, themes: crushing, middlegame, short, side to move: White
- Puzzle 01Yo5_F — ELO 1978, themes: advantage, long, middlegame, side to move: Black
- Puzzle zxtvg — ELO 2222, themes: advantage, attraction, fork, side to move: Black
- Puzzle zxMFO_M — ELO 2274, themes: crushing, long, middlegame, side to move: White
- Puzzle JHYam_F — ELO 2381, themes: anastasiaMate, attraction, mate, 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_4805?
A black rook is under white attack and defended by black, commonly on or near the 8th rank but not restricted to c8 or d8. 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 82 tagged puzzles (0.8% of the set), spanning Lichess ELO 798 to 2470 with a median of 1784.
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.