Black knight advanced to ranks 6–8, uncontested by white, in a middlegame or endgame context.
SAE concept sae_23542 fires when black knight advanced to ranks 6–8, uncontested by white, in a middlegame or endgame context.. It appears in 85 of 9,950 Climbchess puzzles (0.9%), spanning ELO 652–2606 (median 1811).
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This page documents Black knight advanced to ranks 6–8, uncontested…, 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 advanced to ranks 6–8, uncontested by white, in a middlegame or endgame context.
This pattern fires in 85 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 652 to 2606, with a median rating of 1811. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_23542 |
|---|---|
| Puzzles where it fires | 85 |
| Min ELO | 652 |
| Median ELO | 1811 |
| Max ELO | 2606 |
| Coverage | 0.85% 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 zwxd2 — ELO 652, themes: kingsideAttack, mate, mateIn1, side to move: White
- Puzzle zzap4 — ELO 846, themes: kingsideAttack, mate, mateIn2, side to move: White
- Puzzle 01OE9_F — ELO 1081, themes: advantage, long, master, side to move: White
- Puzzle 00dCs_F — ELO 1338, themes: advantage, middlegame, short, side to move: White
- Puzzle 01Shz_F — ELO 1570, themes: crushing, endgame, short, side to move: Black
- Puzzle zyt7o_F — ELO 1811, themes: crushing, master, middlegame, side to move: White
- Puzzle zvDnw_M — ELO 1975, themes: crushing, discoveredAttack, middlegame, side to move: White
- Puzzle zTimH — ELO 2059, themes: endgame, long, mate, side to move: White
- Puzzle zrdxh — ELO 2191, themes: crushing, discoveredAttack, opening, side to move: White
- Puzzle 1u4gJ — ELO 2479, themes: backRankMate, master, mate, 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_23542?
Black knight advanced to ranks 6–8, uncontested by white, in a middlegame or endgame context. 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 85 tagged puzzles (0.9% of the set), spanning Lichess ELO 652 to 2606 with a median of 1811.
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.