Detects a square attacked by at least one black piece, where white has fewer attackers than black, and the square is empty.
SAE concept sae_15034 fires when detects a square attacked by at least one black piece, where white has fewer attackers than black, and the square is empty.. It appears in 39 of 9,950 Climbchess puzzles (0.4%), spanning ELO 1153–2652 (median 1748).
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This page documents Detects a square attacked by at least one 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:
Detects a square attacked by at least one black piece, where white has fewer attackers than black, and the square is empty.
This pattern fires in 39 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 1153 to 2652, with a median rating of 1748. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_15034 |
|---|---|
| Puzzles where it fires | 39 |
| Min ELO | 1153 |
| Median ELO | 1748 |
| Max ELO | 2652 |
| Coverage | 0.39% 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 yS6kj_M — ELO 1153, themes: crushing, endgame, pawnEndgame, side to move: White
- Puzzle zxO1P_F — ELO 1262, themes: crushing, defensiveMove, endgame, side to move: Black
- Puzzle zyebe_M — ELO 1347, themes: crushing, endgame, pawnEndgame, side to move: White
- Puzzle 01vQy — ELO 1571, themes: crushing, endgame, master, side to move: White
- Puzzle 015JV — ELO 1719, themes: advantage, endgame, pawnEndgame, side to move: Black
- Puzzle yuAEu_F — ELO 1748, themes: crushing, defensiveMove, endgame, side to move: White
- Puzzle zoF42_M — ELO 1758, themes: crushing, endgame, pawnEndgame, side to move: Black
- Puzzle zbSJ2 — ELO 2501, themes: crushing, endgame, long, side to move: White
- Puzzle zoKYM_F — ELO 2598, themes: bishopEndgame, crushing, endgame, side to move: White
- Puzzle tpe98_M — ELO 2614, themes: crushing, endgame, veryLong, 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_15034?
Detects a square attacked by at least one black piece, where white has fewer attackers than black, and the square is empty. 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 39 tagged puzzles (0.4% of the set), spanning Lichess ELO 1153 to 2652 with a median of 1748.
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.