Detects a rook remaining on its starting corner square (a1 or h1) while the king has moved away, indicating a potentially undeveloped or misplaced rook in a middlegame position.
SAE concept sae_6671 fires when detects a rook remaining on its starting corner square (a1 or h1) while the king has moved away, indicating a potentially undeveloped or misplaced rook in a middlegame position.. It appears in 105 of 9,950 Climbchess puzzles (1.1%), spanning ELO 670–2612 (median 1557).
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This page documents Detects a rook remaining on its starting corner…, 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 remaining on its starting corner square (a1 or h1) while the king has moved away, indicating a potentially undeveloped or misplaced rook in a middlegame position.
This pattern fires in 105 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 670 to 2612, with a median rating of 1557. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_6671 |
|---|---|
| Puzzles where it fires | 105 |
| Min ELO | 670 |
| Median ELO | 1557 |
| Max ELO | 2612 |
| Coverage | 1.06% 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 zsJLN_M — ELO 670, themes: mate, mateIn1, middlegame, side to move: Black
- Puzzle zoUgt_F — ELO 812, themes: mate, mateIn1, middlegame, side to move: Black
- Puzzle zqrEi_F — ELO 887, themes: backRankMate, long, mate, side to move: White
- Puzzle zPmNS_M — ELO 1173, themes: backRankMate, mate, mateIn2, side to move: White
- Puzzle 02551 — ELO 1408, themes: advantage, endgame, quietMove, side to move: Black
- Puzzle zw6du_F — ELO 1557, themes: crushing, hangingPiece, middlegame, side to move: White
- Puzzle zxAZu — ELO 1658, themes: attraction, crushing, endgame, side to move: White
- Puzzle zuQ7i — ELO 1949, themes: clearance, crushing, endgame, side to move: White
- Puzzle zdjcH — ELO 2117, themes: advantage, middlegame, queensideAttack, side to move: Black
- Puzzle QTWkf — ELO 2409, themes: discoveredAttack, discoveredCheck, enPassant, 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_6671?
Detects a rook remaining on its starting corner square (a1 or h1) while the king has moved away, indicating a potentially undeveloped or misplaced rook in a middlegame position. 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 105 tagged puzzles (1.1% of the set), spanning Lichess ELO 670 to 2612 with a median of 1557.
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.