Detects a white pawn in a king-and-pawn endgame on a semi-open or contested file, in positions with zugzwang or critical king-opposition themes.
SAE concept sae_16717 fires when detects a white pawn in a king-and-pawn endgame on a semi-open or contested file, in positions with zugzwang or critical king-opposition themes.. It appears in 102 of 9,950 Climbchess puzzles (1.0%), spanning ELO 668–2695 (median 1998).
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This page documents Detects a white pawn in a king-and-pawn endgame…, 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 a white pawn in a king-and-pawn endgame on a semi-open or contested file, in positions with zugzwang or critical king-opposition themes.
This pattern fires in 102 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 668 to 2695, with a median rating of 1998. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_16717 |
|---|---|
| Puzzles where it fires | 102 |
| Min ELO | 668 |
| Median ELO | 1998 |
| Max ELO | 2695 |
| Coverage | 1.03% 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 wx8cz — ELO 668, themes: crushing, defensiveMove, endgame, side to move: White
- Puzzle yhoJZ_F — ELO 828, themes: crushing, endgame, pawnEndgame, side to move: White
- Puzzle ztZsb_F — ELO 1031, themes: crushing, defensiveMove, endgame, side to move: Black
- Puzzle zzrSi — ELO 1591, themes: crushing, endgame, long, side to move: White
- Puzzle zDffz_F — ELO 1711, themes: crushing, endgame, pawnEndgame, side to move: White
- Puzzle zX4Wb_F — ELO 1998, themes: crushing, defensiveMove, endgame, side to move: Black
- Puzzle zeSQD — ELO 2236, themes: crushing, endgame, long, side to move: White
- Puzzle zfhn1_F — ELO 2295, themes: bishopEndgame, crushing, defensiveMove, side to move: White
- Puzzle zbSJ2_F — ELO 2501, themes: crushing, endgame, long, side to move: Black
- Puzzle zxjqC_M — ELO 2540, themes: crushing, defensiveMove, deflection, 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_16717?
Detects a white pawn in a king-and-pawn endgame on a semi-open or contested file, in positions with zugzwang or critical king-opposition themes. 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 102 tagged puzzles (1.0% of the set), spanning Lichess ELO 668 to 2695 with a median of 1998.
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.