White pawn on the 3rd rank that is defended by at least one white piece.
SAE concept sae_28964 fires when white pawn on the 3rd rank that is defended by at least one white piece.. It appears in 26 of 9,950 Climbchess puzzles (0.3%), spanning ELO 1508–2506 (median 2187).
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This page documents White pawn on the 3rd rank that is defended by…, 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:
White pawn on the 3rd rank that is defended by at least one white piece.
This pattern fires in 26 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 1508 to 2506, with a median rating of 2187. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_28964 |
|---|---|
| Puzzles where it fires | 26 |
| Min ELO | 1508 |
| Median ELO | 2187 |
| Max ELO | 2506 |
| Coverage | 0.26% 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 xbz0L — ELO 1508, themes: crushing, hangingPiece, long, side to move: Black
- Puzzle xbz0L_M — ELO 1508, themes: crushing, hangingPiece, long, side to move: Black
- Puzzle yQHDy_M — ELO 1594, themes: endgame, hookMate, master, side to move: White
- Puzzle zx46C_F — ELO 1959, themes: attraction, kingsideAttack, long, side to move: Black
- Puzzle ztFY2 — ELO 2111, themes: crushing, endgame, pawnEndgame, side to move: Black
- Puzzle zvXtA — ELO 2187, themes: crushing, deflection, endgame, side to move: White
- Puzzle zvXtA_M — ELO 2187, themes: crushing, deflection, endgame, side to move: White
- Puzzle zfvCd_F — ELO 2299, themes: crushing, endgame, long, side to move: Black
- Puzzle zKJvp — ELO 2428, themes: crushing, endgame, long, side to move: Black
- Puzzle zYrYh — ELO 2506, themes: bishopEndgame, crushing, discoveredAttack, 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_28964?
White pawn on the 3rd rank that is defended by at least one white piece. 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 26 tagged puzzles (0.3% of the set), spanning Lichess ELO 1508 to 2506 with a median of 2187.
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.