Detects a rook on an open file or rank that is directly opposed by an enemy rook, in rook-endgame or heavy-piece positions.
SAE concept sae_9960 fires when detects a rook on an open file or rank that is directly opposed by an enemy rook, in rook-endgame or heavy-piece positions.. It appears in 67 of 9,950 Climbchess puzzles (0.7%), spanning ELO 668–2547 (median 1300).
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This page documents Detects a rook on an open file or rank that is…, 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 rook on an open file or rank that is directly opposed by an enemy rook, in rook-endgame or heavy-piece positions.
This pattern fires in 67 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 668 to 2547, with a median rating of 1300. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_9960 |
|---|---|
| Puzzles where it fires | 67 |
| Min ELO | 668 |
| Median ELO | 1300 |
| Max ELO | 2547 |
| Coverage | 0.67% 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 wx8cz — ELO 668, themes: crushing, defensiveMove, endgame, side to move: White
- Puzzle xxINJ — ELO 832, themes: advantage, clearance, endgame, side to move: White
- Puzzle yHJ1k_F — ELO 855, themes: advantage, attraction, endgame, side to move: Black
- Puzzle rALi1_F — ELO 881, themes: advantage, clearance, endgame, side to move: Black
- Puzzle 01Cq8 — ELO 1173, themes: advantage, endgame, fork, side to move: White
- Puzzle 00DBP_F — ELO 1300, themes: advantage, endgame, master, side to move: White
- Puzzle ylFpP_F — ELO 1443, themes: crushing, endgame, rookEndgame, side to move: White
- Puzzle 00XTV_F — ELO 1566, themes: crushing, endgame, master, side to move: Black
- Puzzle zzXZD_F — ELO 1707, themes: advancedPawn, crushing, deflection, side to move: White
- Puzzle zyArK_M — ELO 2161, themes: crushing, endgame, long, 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_9960?
Detects a rook on an open file or rank that is directly opposed by an enemy rook, in rook-endgame or heavy-piece positions. 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 67 tagged puzzles (0.7% of the set), spanning Lichess ELO 668 to 2547 with a median of 1300.
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.