Detects an uncastled white king on e1 with the h1 rook still on its starting square and kingside castling rights intact.
SAE concept sae_25149 fires when detects an uncastled white king on e1 with the h1 rook still on its starting square and kingside castling rights intact.. It appears in 46 of 9,950 Climbchess puzzles (0.5%), spanning ELO 668–2401 (median 1600).
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This page documents Detects an uncastled white king on e1 with the…, 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 an uncastled white king on e1 with the h1 rook still on its starting square and kingside castling rights intact.
This pattern fires in 46 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 668 to 2401, with a median rating of 1600. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_25149 |
|---|---|
| Puzzles where it fires | 46 |
| Min ELO | 668 |
| Median ELO | 1600 |
| Max ELO | 2401 |
| Coverage | 0.46% 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 ztbom — ELO 668, themes: crushing, discoveredAttack, middlegame, side to move: Black
- Puzzle zzY87 — ELO 1015, themes: advantage, discoveredAttack, kingsideAttack, side to move: Black
- Puzzle 00s16_F — ELO 1168, themes: crushing, fork, opening, side to move: White
- Puzzle zefJw_F — ELO 1256, themes: bodenMate, master, mate, side to move: White
- Puzzle zxCNN — ELO 1480, themes: advantage, middlegame, pin, side to move: White
- Puzzle 021Dc_F — ELO 1600, themes: kingsideAttack, mate, mateIn2, side to move: White
- Puzzle 01ScQ_F — ELO 1690, themes: advantage, opening, short, side to move: Black
- Puzzle 020eU — ELO 1779, themes: advantage, attraction, kingsideAttack, side to move: Black
- Puzzle KZx4g — ELO 1871, themes: doubleBishopMate, mate, mateIn2, side to move: Black
- Puzzle zBHyy_F — ELO 2173, themes: mate, mateIn2, middlegame, 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_25149?
Detects an uncastled white king on e1 with the h1 rook still on its starting square and kingside castling rights intact. 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 46 tagged puzzles (0.5% of the set), spanning Lichess ELO 668 to 2401 with a median of 1600.
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.