Pawn endgame with king opposition or zugzwang, where king proximity to key pawn squares determines the outcome.
SAE concept sae_9926 fires when pawn endgame with king opposition or zugzwang, where king proximity to key pawn squares determines the outcome.. It appears in 7 of 9,950 Climbchess puzzles (0.1%), spanning ELO 799–1616 (median 891).
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This page documents Pawn endgame with king opposition or zugzwang…, 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:
Pawn endgame with king opposition or zugzwang, where king proximity to key pawn squares determines the outcome.
This pattern fires in 7 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 799 to 1616, with a median rating of 891. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_9926 |
|---|---|
| Puzzles where it fires | 7 |
| Min ELO | 799 |
| Median ELO | 891 |
| Max ELO | 1616 |
| Coverage | 0.07% 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 7 puzzles spanning the rating distribution. Each links to its own page with full move list and related concepts.
- Puzzle zv7SO_M — ELO 799, themes: advancedPawn, crushing, endgame, side to move: Black
- Puzzle zt9Jj — ELO 891, themes: advancedPawn, crushing, endgame, side to move: Black
- Puzzle zt9Jj_F — ELO 891, themes: advancedPawn, crushing, endgame, side to move: White
- Puzzle zt9Jj_M — ELO 891, themes: advancedPawn, crushing, endgame, side to move: Black
- Puzzle zc5Ea — ELO 1616, themes: advancedPawn, crushing, endgame, side to move: Black
- Puzzle zc5Ea_F — ELO 1616, themes: advancedPawn, crushing, endgame, side to move: White
- Puzzle zc5Ea_M — ELO 1616, themes: advancedPawn, crushing, endgame, 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_9926?
Pawn endgame with king opposition or zugzwang, where king proximity to key pawn squares determines the outcome. 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 7 tagged puzzles (0.1% of the set), spanning Lichess ELO 799 to 1616 with a median of 891.
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.