The feature detects a pawn on the 6th or 7th rank that is attacked by the side to move, often with a queen or bishop, and defended by the opponent.
SAE concept sae_27808 fires when the feature detects a pawn on the 6th or 7th rank that is attacked by the side to move, often with a queen or bishop, and defended by the opponent.. It appears in 31 of 9,950 Climbchess puzzles (0.3%), spanning ELO 663–1894 (median 1317).
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This page documents The feature detects a pawn on the 6th or 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:
The feature detects a pawn on the 6th or 7th rank that is attacked by the side to move, often with a queen or bishop, and defended by the opponent.
This pattern fires in 31 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 663 to 1894, with a median rating of 1317. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_27808 |
|---|---|
| Puzzles where it fires | 31 |
| Min ELO | 663 |
| Median ELO | 1317 |
| Max ELO | 1894 |
| Coverage | 0.31% 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 zb8en — ELO 663, themes: kingsideAttack, mate, mateIn1, side to move: White
- Puzzle yb1cQ — ELO 894, themes: clearance, endgame, mate, side to move: Black
- Puzzle zuGs4 — ELO 1138, themes: mate, mateIn1, oneMove, side to move: Black
- Puzzle zotn8_F — ELO 1197, themes: attraction, mate, mateIn2, side to move: Black
- Puzzle zutEF_F — ELO 1260, themes: attraction, endgame, mate, side to move: Black
- Puzzle ybeGl_F — ELO 1317, themes: mate, mateIn1, oneMove, side to move: White
- Puzzle zniKh_M — ELO 1426, themes: attraction, endgame, kingsideAttack, side to move: Black
- Puzzle xqxW0_M — ELO 1462, themes: anastasiaMate, attraction, endgame, side to move: Black
- Puzzle yZEGz_M — ELO 1489, themes: anastasiaMate, attraction, endgame, side to move: Black
- Puzzle sE6fl_M — ELO 1531, themes: anastasiaMate, attraction, kingsideAttack, 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_27808?
The feature detects a pawn on the 6th or 7th rank that is attacked by the side to move, often with a queen or bishop, and defended by the opponent. 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 31 tagged puzzles (0.3% of the set), spanning Lichess ELO 663 to 1894 with a median of 1317.
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.