Detects an active knight (either colour) in the middlegame or endgame, regardless of rank or attack status.
SAE concept sae_25060 fires when detects an active knight (either colour) in the middlegame or endgame, regardless of rank or attack status.. It appears in 24 of 9,950 Climbchess puzzles (0.2%), spanning ELO 746–2615 (median 1134).
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This page documents Detects an active knight (either colour) in the…, 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 an active knight (either colour) in the middlegame or endgame, regardless of rank or attack status.
This pattern fires in 24 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 746 to 2615, with a median rating of 1134. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_25060 |
|---|---|
| Puzzles where it fires | 24 |
| Min ELO | 746 |
| Median ELO | 1134 |
| Max ELO | 2615 |
| Coverage | 0.24% 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 zxwfn_M — ELO 746, themes: backRankMate, endgame, long, side to move: Black
- Puzzle zpUAK_F — ELO 758, themes: attraction, backRankMate, long, side to move: White
- Puzzle zx1ag — ELO 843, themes: backRankMate, mate, mateIn2, side to move: White
- Puzzle ztH6n — ELO 918, themes: endgame, hangingPiece, mate, side to move: Black
- Puzzle 01vYY — ELO 1046, themes: advantage, middlegame, short, side to move: White
- Puzzle zq87z — ELO 1134, themes: attraction, endgame, long, side to move: White
- Puzzle zq87z_M — ELO 1134, themes: attraction, endgame, long, side to move: White
- Puzzle gl3da_F — ELO 1393, themes: doubleBishopMate, kingsideAttack, mate, side to move: White
- Puzzle ysuvU_F — ELO 1897, themes: fork, long, mate, side to move: Black
- Puzzle ztLJl — ELO 2615, themes: crushing, fork, middlegame, 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_25060?
Detects an active knight (either colour) in the middlegame or endgame, regardless of rank or attack status. 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 24 tagged puzzles (0.2% of the set), spanning Lichess ELO 746 to 2615 with a median of 1134.
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.