The feature detects squares attacked by exactly one white piece and at least two black pieces, often a pawn on the second rank or a king-side square.
SAE concept sae_5030 fires when the feature detects squares attacked by exactly one white piece and at least two black pieces, often a pawn on the second rank or a king-side square.. It appears in 72 of 9,950 Climbchess puzzles (0.7%), spanning ELO 674–2573 (median 1683).
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This page documents The feature detects squares attacked by exactly…, 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:
The feature detects squares attacked by exactly one white piece and at least two black pieces, often a pawn on the second rank or a king-side square.
This pattern fires in 72 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 674 to 2573, with a median rating of 1683. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_5030 |
|---|---|
| Puzzles where it fires | 72 |
| Min ELO | 674 |
| Median ELO | 1683 |
| Max ELO | 2573 |
| Coverage | 0.72% 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 zaid0 — ELO 674, themes: endgame, mate, mateIn2, side to move: Black
- Puzzle zd0M3 — ELO 842, themes: endgame, long, mate, side to move: White
- Puzzle wb93i — ELO 1152, themes: arabianMate, endgame, master, side to move: Black
- Puzzle 01lqX_F — ELO 1337, themes: crushing, endgame, long, side to move: White
- Puzzle zyrlM_F — ELO 1495, themes: mate, mateIn1, middlegame, side to move: White
- Puzzle zz2sQ_M — ELO 1683, themes: endgame, long, mate, side to move: Black
- Puzzle xVkQw_M — ELO 1831, themes: fork, mate, mateIn4, side to move: Black
- Puzzle zoXT6_F — ELO 1933, themes: attraction, long, mate, side to move: White
- Puzzle JnsRf_F — ELO 2298, themes: doubleBishopMate, kingsideAttack, mate, side to move: Black
- Puzzle xymbO_M — ELO 2401, themes: attraction, crushing, middlegame, 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_5030?
The feature detects squares attacked by exactly one white piece and at least two black pieces, often a pawn on the second rank or a king-side square. 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 72 tagged puzzles (0.7% of the set), spanning Lichess ELO 674 to 2573 with a median of 1683.
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.