White king on e1 with h1-rook intact, poised to castle kingside, or already castled to g1.
SAE concept sae_2423 fires when white king on e1 with h1-rook intact, poised to castle kingside, or already castled to g1.. It appears in 111 of 9,950 Climbchess puzzles (1.1%), spanning ELO 644–2514 (median 1540).
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This page documents White king on e1 with h1-rook intact, poised to…, 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:
White king on e1 with h1-rook intact, poised to castle kingside, or already castled to g1.
This pattern fires in 111 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 644 to 2514, with a median rating of 1540. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_2423 |
|---|---|
| Puzzles where it fires | 111 |
| Min ELO | 644 |
| Median ELO | 1540 |
| Max ELO | 2514 |
| Coverage | 1.12% 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 zv8GW — ELO 644, themes: mate, mateIn1, middlegame, side to move: White
- Puzzle waLrS_F — ELO 765, themes: doubleBishopMate, kingsideAttack, mate, side to move: White
- Puzzle zyWPX — ELO 922, themes: cornerMate, kingsideAttack, mate, side to move: White
- Puzzle zzkBs_F — ELO 1072, themes: advantage, fork, middlegame, side to move: Black
- Puzzle 022HT — ELO 1377, themes: advantage, discoveredAttack, middlegame, side to move: Black
- Puzzle 00e6Q — ELO 1540, themes: advantage, middlegame, short, side to move: Black
- Puzzle zyai0_F — ELO 1771, themes: advantage, hangingPiece, opening, side to move: White
- Puzzle zzc6l — ELO 1890, themes: advantage, fork, long, side to move: White
- Puzzle znBG9_F — ELO 2040, themes: crushing, kingsideAttack, long, side to move: Black
- Puzzle 6ziym — ELO 2342, themes: doubleBishopMate, 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_2423?
White king on e1 with h1-rook intact, poised to castle kingside, or already castled to g1. 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 111 tagged puzzles (1.1% of the set), spanning Lichess ELO 644 to 2514 with a median of 1540.
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.