Black king in an active endgame position, frequently but not exclusively on the 7th or 8th rank, with no immediate attackers.
SAE concept sae_3459 fires when black king in an active endgame position, frequently but not exclusively on the 7th or 8th rank, with no immediate attackers.. It appears in 357 of 9,950 Climbchess puzzles (3.6%), spanning ELO 605–2695 (median 1481).
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This page documents Black king in an active endgame position…, 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:
Black king in an active endgame position, frequently but not exclusively on the 7th or 8th rank, with no immediate attackers.
This pattern fires in 357 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 605 to 2695, with a median rating of 1481. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_3459 |
|---|---|
| Puzzles where it fires | 357 |
| Min ELO | 605 |
| Median ELO | 1481 |
| Max ELO | 2695 |
| Coverage | 3.59% 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 yS8nE — ELO 605, themes: crushing, endgame, long, side to move: Black
- Puzzle zs2Bj_M — ELO 773, themes: backRankMate, endgame, mate, side to move: Black
- Puzzle zx0VA_M — ELO 869, themes: backRankMate, endgame, mate, side to move: White
- Puzzle ztZsb — ELO 1031, themes: crushing, defensiveMove, endgame, side to move: White
- Puzzle zxO1P — ELO 1262, themes: crushing, defensiveMove, endgame, side to move: White
- Puzzle zett3_F — ELO 1481, themes: crushing, defensiveMove, endgame, side to move: White
- Puzzle 01RxX_M — ELO 1714, themes: advantage, endgame, long, side to move: Black
- Puzzle zyQVU_M — ELO 2019, themes: advancedPawn, crushing, deflection, side to move: White
- Puzzle zjbhj — ELO 2235, themes: crushing, defensiveMove, endgame, side to move: Black
- Puzzle zt74O_M — ELO 2352, themes: crushing, defensiveMove, 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_3459?
Black king in an active endgame position, frequently but not exclusively on the 7th or 8th rank, with no immediate attackers. 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 357 tagged puzzles (3.6% of the set), spanning Lichess ELO 605 to 2695 with a median of 1481.
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.