Black knight in the centre or on the 4th–7th rank, undefended and not attacked by white.
SAE concept sae_24965 fires when black knight in the centre or on the 4th–7th rank, undefended and not attacked by white.. It appears in 173 of 9,950 Climbchess puzzles (1.7%), spanning ELO 666–2658 (median 1636).
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This page documents Black knight in the centre or on the 4th–7th…, 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:
Black knight in the centre or on the 4th–7th rank, undefended and not attacked by white.
This pattern fires in 173 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 666 to 2658, with a median rating of 1636. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_24965 |
|---|---|
| Puzzles where it fires | 173 |
| Min ELO | 666 |
| Median ELO | 1636 |
| Max ELO | 2658 |
| Coverage | 1.74% 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 z8Zl7 — ELO 666, themes: crushing, deflection, endgame, side to move: Black
- Puzzle zy7i9_M — ELO 897, themes: crushing, endgame, long, side to move: White
- Puzzle zzrxN_M — ELO 1053, themes: crushing, discoveredAttack, middlegame, side to move: Black
- Puzzle 00au3_M — ELO 1249, themes: crushing, endgame, master, side to move: Black
- Puzzle 01K12_F — ELO 1385, themes: advantage, kingsideAttack, long, side to move: Black
- Puzzle zzhhc — ELO 1636, themes: crushing, discoveredAttack, long, side to move: Black
- Puzzle zmmst_M — ELO 1774, themes: crushing, endgame, exposedKing, side to move: Black
- Puzzle 3xOgD_F — ELO 2101, themes: attraction, endgame, hookMate, side to move: White
- Puzzle 00fXf — ELO 2228, themes: advantage, master, middlegame, side to move: White
- Puzzle uuH2Y — ELO 2444, themes: advantage, defensiveMove, endgame, 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_24965?
Black knight in the centre or on the 4th–7th rank, undefended and not attacked by white. 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 173 tagged puzzles (1.7% of the set), spanning Lichess ELO 666 to 2658 with a median of 1636.
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.