A black rook is under attack by a white piece and defended by a black piece, often but not exclusively on the back rank.
SAE concept sae_12398 fires when a black rook is under attack by a white piece and defended by a black piece, often but not exclusively on the back rank.. It appears in 43 of 9,950 Climbchess puzzles (0.4%), spanning ELO 798–2634 (median 1287).
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This page documents A black rook is under attack by a white 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 black rook is under attack by a white piece and defended by a black piece, often but not exclusively on the back rank.
This pattern fires in 43 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 798 to 2634, with a median rating of 1287. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_12398 |
|---|---|
| Puzzles where it fires | 43 |
| Min ELO | 798 |
| Median ELO | 1287 |
| Max ELO | 2634 |
| Coverage | 0.43% 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 pWWrk — ELO 853, themes: advancedPawn, advantage, endgame, side to move: White
- Puzzle 00eNe_F — ELO 885, themes: kingsideAttack, mate, mateIn2, side to move: Black
- Puzzle zMjwr — ELO 1062, themes: backRankMate, endgame, fork, side to move: Black
- Puzzle zytIA_M — ELO 1134, themes: advantage, endgame, fork, side to move: White
- Puzzle ziENm — ELO 1287, themes: crushing, endgame, master, side to move: Black
- Puzzle zu4ol_F — ELO 1422, themes: advancedPawn, advantage, deflection, side to move: Black
- Puzzle zzmYF_F — ELO 1997, themes: advantage, deflection, endgame, side to move: Black
- Puzzle LIBm6 — ELO 2159, themes: cornerMate, endgame, mate, side to move: Black
- Puzzle UXV0Y_F — ELO 2409, themes: attraction, hookMate, 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_12398?
A black rook is under attack by a white piece and defended by a black piece, often but not exclusively on the back rank. 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 43 tagged puzzles (0.4% of the set), spanning Lichess ELO 798 to 2634 with a median of 1287.
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.