A castled or home-square king under pressure from enemy pieces in a middlegame or endgame attack.
SAE concept sae_29047 fires when a castled or home-square king under pressure from enemy pieces in a middlegame or endgame attack.. It appears in 10 of 9,950 Climbchess puzzles (0.1%), spanning ELO 1386–2249 (median 2123).
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This page documents A castled or home-square king under pressure…, 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:
A castled or home-square king under pressure from enemy pieces in a middlegame or endgame attack.
This pattern fires in 10 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 1386 to 2249, with a median rating of 2123. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_29047 |
|---|---|
| Puzzles where it fires | 10 |
| Min ELO | 1386 |
| Median ELO | 2123 |
| Max ELO | 2249 |
| Coverage | 0.10% 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 00sTO — ELO 1386, themes: crushing, endgame, long, side to move: Black
- Puzzle 00sTO_F — ELO 1386, themes: crushing, endgame, long, side to move: White
- Puzzle zwdQj — ELO 1670, themes: crushing, defensiveMove, long, side to move: White
- Puzzle zwdQj_F — ELO 1670, themes: crushing, defensiveMove, long, side to move: Black
- Puzzle zdnyL — ELO 2123, themes: crushing, defensiveMove, long, side to move: White
- Puzzle zdnyL_F — ELO 2123, themes: crushing, defensiveMove, long, side to move: Black
- Puzzle zdnyL_M — ELO 2123, themes: crushing, defensiveMove, long, side to move: White
- Puzzle yyuoZ — ELO 2249, themes: crushing, discoveredAttack, discoveredCheck, side to move: White
- Puzzle yyuoZ_F — ELO 2249, themes: crushing, discoveredAttack, discoveredCheck, side to move: Black
- Puzzle yyuoZ_M — ELO 2249, themes: crushing, discoveredAttack, discoveredCheck, 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_29047?
A castled or home-square king under pressure from enemy pieces in a middlegame or endgame attack. 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 10 tagged puzzles (0.1% of the set), spanning Lichess ELO 1386 to 2249 with a median of 2123.
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.