A black piece on a contested square where black retains at least partial control.
SAE concept sae_7930 fires when a black piece on a contested square where black retains at least partial control.. It appears in 101 of 9,950 Climbchess puzzles (1.0%), spanning ELO 643–2655 (median 1608).
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This page documents A black piece on a contested square where black…, 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:
A black piece on a contested square where black retains at least partial control.
This pattern fires in 101 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 643 to 2655, with a median rating of 1608. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_7930 |
|---|---|
| Puzzles where it fires | 101 |
| Min ELO | 643 |
| Median ELO | 1608 |
| Max ELO | 2655 |
| Coverage | 1.02% 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 zrzrE — ELO 643, themes: advantage, fork, master, side to move: Black
- Puzzle zzf0W_F — ELO 849, themes: backRankMate, endgame, mate, side to move: White
- Puzzle zuHxz_M — ELO 898, themes: deflection, endgame, mate, side to move: Black
- Puzzle zsQsJ_M — ELO 1162, themes: advantage, endgame, long, side to move: White
- Puzzle zx1EE — ELO 1460, themes: crushing, defensiveMove, endgame, side to move: Black
- Puzzle yGpbg_M — ELO 1608, themes: discoveredAttack, discoveredCheck, endgame, side to move: Black
- Puzzle zTMep_M — ELO 1913, themes: deflection, kingsideAttack, mate, side to move: Black
- Puzzle vTPG6_F — ELO 2018, themes: endgame, exposedKing, hookMate, side to move: Black
- Puzzle wgl84_M — ELO 2154, themes: arabianMate, endgame, mate, side to move: White
- Puzzle bf444_F — ELO 2400, themes: dovetailMate, endgame, mate, 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_7930?
A black piece on a contested square where black retains at least partial control. 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 101 tagged puzzles (1.0% of the set), spanning Lichess ELO 643 to 2655 with a median of 1608.
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.