A white knight on a stable central or near-central square, participating in an attack or controlling key squares.
SAE concept sae_19500 fires when a white knight on a stable central or near-central square, participating in an attack or controlling key squares.. It appears in 897 of 9,950 Climbchess puzzles (9.0%), spanning ELO 613–2683 (median 1466).
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This page documents A white knight on a stable central or…, 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 white knight on a stable central or near-central square, participating in an attack or controlling key squares.
This pattern fires in 897 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 613 to 2683, with a median rating of 1466. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_19500 |
|---|---|
| Puzzles where it fires | 897 |
| Min ELO | 613 |
| Median ELO | 1466 |
| Max ELO | 2683 |
| Coverage | 9.02% 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 xbPL4 — ELO 613, themes: anastasiaMate, endgame, mate, side to move: White
- Puzzle sgNLg_M — ELO 820, themes: endgame, hookMate, mate, side to move: Black
- Puzzle zxuJW — ELO 958, themes: advantage, middlegame, short, side to move: White
- Puzzle zcL1i — ELO 1149, themes: anastasiaMate, master, mate, side to move: White
- Puzzle z7bOm — ELO 1307, themes: mate, mateIn2, middlegame, side to move: Black
- Puzzle yy3Gx_F — ELO 1466, themes: endgame, hookMate, mate, side to move: Black
- Puzzle yGpbg_F — ELO 1608, themes: discoveredAttack, discoveredCheck, endgame, side to move: White
- Puzzle rfaRc — ELO 1873, themes: endgame, hookMate, mate, side to move: Black
- Puzzle 01jTV_F — ELO 2131, themes: crushing, master, middlegame, side to move: White
- Puzzle etLeX_F — ELO 2357, themes: discoveredCheck, doubleCheck, kingsideAttack, 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_19500?
A white knight on a stable central or near-central square, participating in an attack or controlling key squares. 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 897 tagged puzzles (9.0% of the set), spanning Lichess ELO 613 to 2683 with a median of 1466.
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.