Detects king-and-pawn endgames with kings in opposition or near-opposition, where one king is making a breakthrough.
SAE concept sae_13689 fires when detects king-and-pawn endgames with kings in opposition or near-opposition, where one king is making a breakthrough.. It appears in 375 of 9,950 Climbchess puzzles (3.8%), spanning ELO 625–2688 (median 1321).
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This page documents Detects king-and-pawn endgames with kings in…, 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 king-and-pawn endgames with kings in opposition or near-opposition, where one king is making a breakthrough.
This pattern fires in 375 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 625 to 2688, with a median rating of 1321. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_13689 |
|---|---|
| Puzzles where it fires | 375 |
| Min ELO | 625 |
| Median ELO | 1321 |
| Max ELO | 2688 |
| Coverage | 3.77% 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 00aU5 — ELO 625, themes: crushing, endgame, master, side to move: Black
- Puzzle sbKXF — ELO 791, themes: anastasiaMate, endgame, mate, side to move: White
- Puzzle ziM3H — ELO 896, themes: crushing, endgame, rookEndgame, side to move: White
- Puzzle zskNw — ELO 1059, themes: crushing, endgame, short, side to move: Black
- Puzzle zxpxD — ELO 1188, themes: crushing, endgame, short, side to move: Black
- Puzzle zx5ld — ELO 1321, themes: crushing, endgame, long, side to move: White
- Puzzle yQHDy — ELO 1594, themes: endgame, hookMate, master, side to move: White
- Puzzle 01AcF_M — ELO 1908, themes: crushing, endgame, rookEndgame, side to move: White
- Puzzle zHN5Q_F — ELO 2211, themes: defensiveMove, endgame, mate, side to move: Black
- Puzzle z0N0m_F — ELO 2457, themes: endgame, long, mate, 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_13689?
Detects king-and-pawn endgames with kings in opposition or near-opposition, where one king is making a breakthrough. 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 375 tagged puzzles (3.8% of the set), spanning Lichess ELO 625 to 2688 with a median of 1321.
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.