An active knight in an endgame tactical position, often delivering or enabling a mating attack.
SAE concept sae_5085 fires when an active knight in an endgame tactical position, often delivering or enabling a mating attack.. It appears in 334 of 9,950 Climbchess puzzles (3.4%), spanning ELO 613–2634 (median 1372).
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This page documents An active knight in an endgame tactical…, 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:
An active knight in an endgame tactical position, often delivering or enabling a mating attack.
This pattern fires in 334 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 613 to 2634, with a median rating of 1372. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_5085 |
|---|---|
| Puzzles where it fires | 334 |
| Min ELO | 613 |
| Median ELO | 1372 |
| Max ELO | 2634 |
| Coverage | 3.36% 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 x5nI3_M — ELO 803, themes: endgame, epauletteMate, hookMate, side to move: Black
- Puzzle zy1nq_M — ELO 882, themes: crushing, endgame, fork, side to move: Black
- Puzzle yfVZn_M — ELO 1003, themes: anastasiaMate, endgame, mate, side to move: White
- Puzzle zcL1i_F — ELO 1149, themes: anastasiaMate, master, mate, side to move: Black
- Puzzle zlyu4 — ELO 1372, themes: arabianMate, mate, mateIn2, side to move: White
- Puzzle zFuYm_M — ELO 1556, themes: crushing, fork, long, side to move: Black
- Puzzle zz45R_F — ELO 1712, themes: crushing, deflection, endgame, side to move: Black
- Puzzle zl5vq_M — ELO 2023, themes: crushing, exposedKing, fork, side to move: Black
- Puzzle zu4Fn_M — ELO 2210, themes: crushing, deflection, endgame, 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_5085?
An active knight in an endgame tactical position, often delivering or enabling a mating 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 334 tagged puzzles (3.4% of the set), spanning Lichess ELO 613 to 2634 with a median of 1372.
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.