King actively centralised in a late endgame (pawn or minor piece), not constrained to a specific rank or file.
SAE concept sae_2049 fires when king actively centralised in a late endgame (pawn or minor piece), not constrained to a specific rank or file.. It appears in 1,543 of 9,950 Climbchess puzzles (15.5%), spanning ELO 605–2698 (median 1584).
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This page documents King actively centralised in a late 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 actively centralised in a late endgame (pawn or minor piece), not constrained to a specific rank or file.
This pattern fires in 1,543 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 605 to 2698, with a median rating of 1584. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_2049 |
|---|---|
| Puzzles where it fires | 1,543 |
| Min ELO | 605 |
| Median ELO | 1584 |
| Max ELO | 2698 |
| Coverage | 15.51% 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 QEesa — ELO 829, themes: crushing, defensiveMove, endgame, side to move: White
- Puzzle zmqww_F — ELO 947, themes: crushing, defensiveMove, endgame, side to move: Black
- Puzzle zxCq4_F — ELO 1144, themes: crushing, endgame, long, side to move: Black
- Puzzle zyKSX_F — ELO 1303, themes: endgame, mate, mateIn2, side to move: Black
- Puzzle zs3s4 — ELO 1584, themes: backRankMate, endgame, mate, side to move: White
- Puzzle zyxDV_F — ELO 1746, themes: advancedPawn, advantage, deflection, side to move: White
- Puzzle zyv2u_M — ELO 1969, themes: advancedPawn, crushing, endgame, side to move: White
- Puzzle MHY5R — ELO 2178, themes: doubleBishopMate, endgame, mate, side to move: White
- Puzzle zp3Hc_F — ELO 2404, themes: crushing, endgame, long, 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_2049?
King actively centralised in a late endgame (pawn or minor piece), not constrained to a specific rank or file. 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 1,543 tagged puzzles (15.5% of the set), spanning Lichess ELO 605 to 2698 with a median of 1584.
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.