An active black rook on a rank where it cannot be immediately captured, typically the 8th, 7th, or a central rank — contributing to back-rank pressure or a rook lift.
SAE concept sae_36566 fires when an active black rook on a rank where it cannot be immediately captured, typically the 8th, 7th, or a central rank — contributing to back-rank pressure or a rook lift.. It appears in 58 of 9,950 Climbchess puzzles (0.6%), spanning ELO 738–2652 (median 1212).
Free forever · no email · no signup · delete data anytime.
This page documents An active black rook on a rank where it cannot…, 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:
An active black rook on a rank where it cannot be immediately captured, typically the 8th, 7th, or a central rank — contributing to back-rank pressure or a rook lift.
This pattern fires in 58 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 738 to 2652, with a median rating of 1212. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_36566 |
|---|---|
| Puzzles where it fires | 58 |
| Min ELO | 738 |
| Median ELO | 1212 |
| Max ELO | 2652 |
| Coverage | 0.58% 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 zSU6V — ELO 738, themes: anastasiaMate, endgame, mate, side to move: White
- Puzzle zfT9H_M — ELO 744, themes: doubleBishopMate, endgame, hangingPiece, side to move: White
- Puzzle zxLMx_M — ELO 786, themes: endgame, mate, mateIn2, side to move: White
- Puzzle yt8Fy — ELO 903, themes: anastasiaMate, endgame, mate, side to move: Black
- Puzzle zQVCa_F — ELO 1128, themes: endgame, hookMate, long, side to move: White
- Puzzle 77B2N_F — ELO 1212, themes: doubleBishopMate, endgame, mate, side to move: White
- Puzzle zzn4f — ELO 1363, themes: endgame, mate, mateIn2, side to move: Black
- Puzzle zwCaO_F — ELO 1495, themes: attraction, exposedKing, long, side to move: White
- Puzzle 00dRh_F — ELO 1829, themes: crushing, middlegame, short, side to move: Black
- Puzzle wOj8V — ELO 2061, themes: endgame, hookMate, 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_36566?
An active black rook on a rank where it cannot be immediately captured, typically the 8th, 7th, or a central rank — contributing to back-rank pressure or a rook lift. 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 58 tagged puzzles (0.6% of the set), spanning Lichess ELO 738 to 2652 with a median of 1212.
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.