King actively centralised or advancing toward a critical square in a simplified endgame.
SAE concept sae_26052 fires when king actively centralised or advancing toward a critical square in a simplified endgame.. It appears in 59 of 9,950 Climbchess puzzles (0.6%), spanning ELO 931–2698 (median 1900).
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This page documents King actively centralised or advancing toward a…, 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 actively centralised or advancing toward a critical square in a simplified endgame.
This pattern fires in 59 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 931 to 2698, with a median rating of 1900. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_26052 |
|---|---|
| Puzzles where it fires | 59 |
| Min ELO | 931 |
| Median ELO | 1900 |
| Max ELO | 2698 |
| Coverage | 0.59% 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 ztci8 — ELO 931, themes: advantage, defensiveMove, endgame, side to move: White
- Puzzle zzqP5_M — ELO 1028, themes: crushing, endgame, fork, side to move: White
- Puzzle 015fL_F — ELO 1206, themes: endgame, mate, mateIn2, side to move: Black
- Puzzle zypSs_M — ELO 1427, themes: crushing, endgame, exposedKing, side to move: White
- Puzzle 01hHF_M — ELO 1611, themes: bishopEndgame, crushing, endgame, side to move: Black
- Puzzle zTHBT_M — ELO 1900, themes: crushing, defensiveMove, endgame, side to move: Black
- Puzzle zvG5k_F — ELO 2038, themes: crushing, endgame, short, side to move: Black
- Puzzle 00ZSu — ELO 2143, themes: advantage, endgame, rookEndgame, side to move: Black
- Puzzle zy8Ar — ELO 2249, themes: crushing, defensiveMove, endgame, side to move: Black
- Puzzle yqA7A — ELO 2417, themes: crushing, endgame, hangingPiece, 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_26052?
King actively centralised or advancing toward a critical square in a simplified endgame. 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 59 tagged puzzles (0.6% of the set), spanning Lichess ELO 931 to 2698 with a median of 1900.
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.