An uncastled rook on the back rank that retains castling rights, with no immediate threats targeting it.
SAE concept sae_1774 fires when an uncastled rook on the back rank that retains castling rights, with no immediate threats targeting it.. It appears in 1,255 of 9,950 Climbchess puzzles (12.6%), spanning ELO 629–2685 (median 1551).
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This page documents An uncastled rook on the back rank that retains…, 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 uncastled rook on the back rank that retains castling rights, with no immediate threats targeting it.
This pattern fires in 1,255 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 629 to 2685, with a median rating of 1551. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_1774 |
|---|---|
| Puzzles where it fires | 1,255 |
| Min ELO | 629 |
| Median ELO | 1551 |
| Max ELO | 2685 |
| Coverage | 12.61% 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 zyuwl — ELO 629, themes: mate, mateIn1, middlegame, side to move: Black
- Puzzle 01ngC — ELO 850, themes: mate, mateIn1, middlegame, side to move: White
- Puzzle 00nZE_F — ELO 984, themes: mate, mateIn2, middlegame, side to move: White
- Puzzle zfRFt_M — ELO 1184, themes: advantage, attraction, exposedKing, side to move: White
- Puzzle zoRQP_F — ELO 1367, themes: capturingDefender, crushing, discoveredAttack, side to move: White
- Puzzle vXFf8_F — ELO 1551, themes: deflection, doubleBishopMate, mate, side to move: White
- Puzzle zyuOW — ELO 1681, themes: crushing, fork, middlegame, side to move: Black
- Puzzle zwkAl_M — ELO 1899, themes: advantage, deflection, long, side to move: White
- Puzzle z5aBt — ELO 2123, themes: discoveredAttack, discoveredCheck, intermezzo, side to move: Black
- Puzzle 01iTZ_M — ELO 2353, themes: advantage, opening, short, 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_1774?
An uncastled rook on the back rank that retains castling rights, with no immediate threats targeting it. 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 1,255 tagged puzzles (12.6% of the set), spanning Lichess ELO 629 to 2685 with a median of 1551.
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.