A black minor piece (bishop or knight) on the 6th or 7th rank with no white attackers.
SAE concept sae_26743 fires when a black minor piece (bishop or knight) on the 6th or 7th rank with no white attackers.. It appears in 73 of 9,950 Climbchess puzzles (0.7%), spanning ELO 615–2479 (median 1866).
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This page documents A black minor piece (bishop or knight) on 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:
A black minor piece (bishop or knight) on the 6th or 7th rank with no white attackers.
This pattern fires in 73 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 615 to 2479, with a median rating of 1866. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_26743 |
|---|---|
| Puzzles where it fires | 73 |
| Min ELO | 615 |
| Median ELO | 1866 |
| Max ELO | 2479 |
| Coverage | 0.73% 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 zLpuK — ELO 615, themes: attraction, kingsideAttack, mate, side to move: White
- Puzzle zyjKX_F — ELO 690, themes: backRankMate, mate, mateIn2, side to move: Black
- Puzzle zzap4 — ELO 846, themes: kingsideAttack, mate, mateIn2, side to move: White
- Puzzle zy5aE_F — ELO 874, themes: mate, mateIn2, middlegame, side to move: White
- Puzzle zvfu5_M — ELO 1041, themes: advancedPawn, crushing, endgame, side to move: White
- Puzzle ymiA2 — ELO 1866, themes: backRankMate, deflection, fork, side to move: Black
- Puzzle zd3A9_F — ELO 1938, themes: endgame, hookMate, mate, side to move: White
- Puzzle TZvyG_M — ELO 2174, themes: backRankMate, long, mate, side to move: Black
- Puzzle zzofI — ELO 2248, themes: crushing, long, master, side to move: Black
- Puzzle AChc6_F — ELO 2424, themes: attraction, deflection, discoveredAttack, 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_26743?
A black minor piece (bishop or knight) on the 6th or 7th rank with no white attackers. 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 73 tagged puzzles (0.7% of the set), spanning Lichess ELO 615 to 2479 with a median of 1866.
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.