The feature detects an empty square on the first rank that is not attacked by white pieces, and is a potential castling square for the king.
SAE concept sae_3570 fires when the feature detects an empty square on the first rank that is not attacked by white pieces, and is a potential castling square for the king.. It appears in 55 of 9,950 Climbchess puzzles (0.6%), spanning ELO 618–2683 (median 1652).
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This page documents The feature detects an empty square on the first…, 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:
The feature detects an empty square on the first rank that is not attacked by white pieces, and is a potential castling square for the king.
This pattern fires in 55 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 618 to 2683, with a median rating of 1652. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_3570 |
|---|---|
| Puzzles where it fires | 55 |
| Min ELO | 618 |
| Median ELO | 1652 |
| Max ELO | 2683 |
| Coverage | 0.55% 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 yZzjp — ELO 618, themes: arabianMate, endgame, mate, side to move: White
- Puzzle zmRyc_M — ELO 866, themes: endgame, hookMate, mate, side to move: Black
- Puzzle zJGoD_M — ELO 1111, themes: advancedPawn, crushing, endgame, side to move: White
- Puzzle 00Mke_F — ELO 1211, themes: crushing, endgame, long, side to move: Black
- Puzzle x568R_F — ELO 1456, themes: endgame, hookMate, master, side to move: White
- Puzzle z6B8C_M — ELO 1652, themes: arabianMate, endgame, long, side to move: White
- Puzzle np7Af — ELO 1947, themes: arabianMate, endgame, mate, side to move: Black
- Puzzle zP4Oi_F — ELO 2015, themes: advancedPawn, crushing, endgame, side to move: Black
- Puzzle zjiQj_F — ELO 2250, themes: endgame, long, master, side to move: White
- Puzzle zWdty_M — ELO 2655, themes: endgame, long, mate, 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_3570?
The feature detects an empty square on the first rank that is not attacked by white pieces, and is a potential castling square for the king. 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 55 tagged puzzles (0.6% of the set), spanning Lichess ELO 618 to 2683 with a median of 1652.
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.