A rook is actively placed on a key rank or file where it creates immediate tactical threats, often involving back-rank or invasion motifs.
SAE concept sae_9149 fires when a rook is actively placed on a key rank or file where it creates immediate tactical threats, often involving back-rank or invasion motifs.. It appears in 132 of 9,950 Climbchess puzzles (1.3%), spanning ELO 731–2692 (median 1315).
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This page documents A rook is actively placed on a key rank or file…, 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 rook is actively placed on a key rank or file where it creates immediate tactical threats, often involving back-rank or invasion motifs.
This pattern fires in 132 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 731 to 2692, with a median rating of 1315. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_9149 |
|---|---|
| Puzzles where it fires | 132 |
| Min ELO | 731 |
| Median ELO | 1315 |
| Max ELO | 2692 |
| Coverage | 1.33% 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 x0qbS — ELO 731, themes: anastasiaMate, endgame, mate, side to move: Black
- Puzzle wrNhX_M — ELO 869, themes: advantage, attraction, endgame, side to move: White
- Puzzle wYu8Q — ELO 919, themes: anastasiaMate, endgame, mate, side to move: White
- Puzzle zMjwr_F — ELO 1062, themes: backRankMate, endgame, fork, side to move: White
- Puzzle zx040_M — ELO 1125, themes: advancedPawn, crushing, endgame, side to move: Black
- Puzzle zoZTY_F — ELO 1315, themes: crushing, endgame, hangingPiece, side to move: Black
- Puzzle 00XTV_M — ELO 1566, themes: crushing, endgame, master, side to move: White
- Puzzle zXICC_M — ELO 1610, themes: backRankMate, endgame, mate, side to move: White
- Puzzle zio9w — ELO 1808, themes: crushing, endgame, hangingPiece, side to move: White
- Puzzle zy7yq_F — ELO 2094, themes: endgame, master, masterVsMaster, 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_9149?
A rook is actively placed on a key rank or file where it creates immediate tactical threats, often involving back-rank or invasion motifs. 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 132 tagged puzzles (1.3% of the set), spanning Lichess ELO 731 to 2692 with a median of 1315.
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.