Detects a piece (king, knight, or bishop) on a corner square (typically h1 or h8) in tactical positions, often connected to smothered mate or corner king motifs.
SAE concept sae_351 fires when detects a piece (king, knight, or bishop) on a corner square (typically h1 or h8) in tactical positions, often connected to smothered mate or corner king motifs.. It appears in 593 of 9,950 Climbchess puzzles (6.0%), spanning ELO 610–2697 (median 1481).
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This page documents Detects a piece (king, knight, or bishop) on a…, 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 a piece (king, knight, or bishop) on a corner square (typically h1 or h8) in tactical positions, often connected to smothered mate or corner king motifs.
This pattern fires in 593 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 610 to 2697, with a median rating of 1481. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_351 |
|---|---|
| Puzzles where it fires | 593 |
| Min ELO | 610 |
| Median ELO | 1481 |
| Max ELO | 2697 |
| Coverage | 5.96% 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 zXEls — ELO 610, themes: mate, mateIn1, oneMove, side to move: White
- Puzzle znXLk_M — ELO 831, themes: crushing, deflection, endgame, side to move: White
- Puzzle 01SLc — ELO 960, themes: crushing, deflection, endgame, side to move: Black
- Puzzle zx8XN_M — ELO 1157, themes: crushing, deflection, middlegame, side to move: White
- Puzzle zuVwb_M — ELO 1260, themes: advantage, interference, middlegame, side to move: White
- Puzzle zMGTG_F — ELO 1481, themes: clearance, kingsideAttack, mate, side to move: Black
- Puzzle zypFw_M — ELO 1674, themes: advantage, master, middlegame, side to move: White
- Puzzle zzpAZ_M — ELO 1812, themes: mate, mateIn1, middlegame, side to move: Black
- Puzzle 00FF5 — ELO 1981, themes: attackingF2F7, crushing, middlegame, side to move: Black
- Puzzle zqd7g_F — ELO 2271, themes: crushing, deflection, exposedKing, 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_351?
Detects a piece (king, knight, or bishop) on a corner square (typically h1 or h8) in tactical positions, often connected to smothered mate or corner king motifs. 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 593 tagged puzzles (6.0% of the set), spanning Lichess ELO 610 to 2697 with a median of 1481.
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.