Detects squares under sole black pawn control in endgames, typically corresponding to black's space advantage or a passed pawn advance.
SAE concept sae_18305 fires when detects squares under sole black pawn control in endgames, typically corresponding to black's space advantage or a passed pawn advance.. It appears in 12 of 9,950 Climbchess puzzles (0.1%), spanning ELO 1814–2680 (median 2598).
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This page documents Detects squares under sole black pawn control 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 squares under sole black pawn control in endgames, typically corresponding to black's space advantage or a passed pawn advance.
This pattern fires in 12 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 1814 to 2680, with a median rating of 2598. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_18305 |
|---|---|
| Puzzles where it fires | 12 |
| Min ELO | 1814 |
| Median ELO | 2598 |
| Max ELO | 2680 |
| Coverage | 0.12% 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 zkE7f — ELO 1814, themes: crushing, endgame, pawnEndgame, side to move: White
- Puzzle zkE7f_F — ELO 1814, themes: crushing, endgame, pawnEndgame, side to move: Black
- Puzzle zyc2q — ELO 1854, themes: crushing, endgame, long, side to move: White
- Puzzle zyc2q_F — ELO 1854, themes: crushing, endgame, long, side to move: Black
- Puzzle zeHle — ELO 2586, themes: crushing, discoveredAttack, endgame, side to move: Black
- Puzzle zoKYM — ELO 2598, themes: bishopEndgame, crushing, endgame, side to move: Black
- Puzzle zoKYM_F — ELO 2598, themes: bishopEndgame, crushing, endgame, side to move: White
- Puzzle zoKYM_M — ELO 2598, themes: bishopEndgame, crushing, endgame, side to move: Black
- Puzzle zzani — ELO 2680, themes: crushing, defensiveMove, endgame, side to move: Black
- Puzzle zzani_F — ELO 2680, themes: crushing, defensiveMove, endgame, 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_18305?
Detects squares under sole black pawn control in endgames, typically corresponding to black's space advantage or a passed pawn advance. 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 12 tagged puzzles (0.1% of the set), spanning Lichess ELO 1814 to 2680 with a median of 2598.
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.