King on rank 2 or 7 in a simplified endgame, often with passed pawns or mating threats nearby.
SAE concept sae_2860 fires when king on rank 2 or 7 in a simplified endgame, often with passed pawns or mating threats nearby.. It appears in 333 of 9,950 Climbchess puzzles (3.3%), spanning ELO 613–2680 (median 1184).
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This page documents King on rank 2 or 7 in a simplified 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:
King on rank 2 or 7 in a simplified endgame, often with passed pawns or mating threats nearby.
This pattern fires in 333 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 613 to 2680, with a median rating of 1184. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_2860 |
|---|---|
| Puzzles where it fires | 333 |
| Min ELO | 613 |
| Median ELO | 1184 |
| Max ELO | 2680 |
| Coverage | 3.35% 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 xbPL4 — ELO 613, themes: anastasiaMate, endgame, mate, side to move: White
- Puzzle y4XuQ — ELO 778, themes: endgame, hookMate, mate, side to move: Black
- Puzzle yELhy — ELO 875, themes: crushing, defensiveMove, endgame, side to move: Black
- Puzzle z4Zgo — ELO 949, themes: advancedPawn, clearance, crushing, side to move: Black
- Puzzle zvZgm_F — ELO 996, themes: crushing, endgame, short, side to move: White
- Puzzle xwNOy — ELO 1184, themes: bishopEndgame, doubleBishopMate, endgame, side to move: Black
- Puzzle 02AeY — ELO 1343, themes: advantage, endgame, fork, side to move: White
- Puzzle 00k2Z — ELO 1574, themes: endgame, mate, mateIn2, side to move: White
- Puzzle x04fe_M — ELO 1893, themes: discoveredAttack, endgame, hookMate, side to move: Black
- Puzzle zzNGa_M — ELO 2174, themes: attraction, 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_2860?
King on rank 2 or 7 in a simplified endgame, often with passed pawns or mating threats nearby. 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 333 tagged puzzles (3.3% of the set), spanning Lichess ELO 613 to 2680 with a median of 1184.
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.