Squares vulnerable to enemy pawn attack with insufficient local defence.
SAE concept sae_26809 fires when squares vulnerable to enemy pawn attack with insufficient local defence.. It appears in 5 of 9,950 Climbchess puzzles (0.1%), spanning ELO 1186–1969 (median 1969).
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This page documents Squares vulnerable to enemy pawn attack with…, 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:
Squares vulnerable to enemy pawn attack with insufficient local defence.
This pattern fires in 5 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 1186 to 1969, with a median rating of 1969. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_26809 |
|---|---|
| Puzzles where it fires | 5 |
| Min ELO | 1186 |
| Median ELO | 1969 |
| Max ELO | 1969 |
| Coverage | 0.05% 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 5 puzzles spanning the rating distribution. Each links to its own page with full move list and related concepts.
- Puzzle zwyZj — ELO 1186, themes: attraction, crushing, endgame, side to move: White
- Puzzle zwyZj_F — ELO 1186, themes: attraction, crushing, endgame, side to move: Black
- Puzzle zyv2u — ELO 1969, themes: advancedPawn, crushing, endgame, side to move: White
- Puzzle zyv2u_F — ELO 1969, themes: advancedPawn, crushing, endgame, side to move: Black
- Puzzle zyv2u_M — ELO 1969, themes: advancedPawn, crushing, endgame, 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_26809?
Squares vulnerable to enemy pawn attack with insufficient local defence. 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 5 tagged puzzles (0.1% of the set), spanning Lichess ELO 1186 to 1969 with a median of 1969.
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.