Pawn on the 3rd or 4th rank (from its side) that is undefended by its own side and attacked by the opponent.
SAE concept sae_1054 fires when pawn on the 3rd or 4th rank (from its side) that is undefended by its own side and attacked by the opponent.. It appears in 38 of 9,950 Climbchess puzzles (0.4%), spanning ELO 614–2683 (median 1690).
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This page documents Pawn on the 3rd or 4th rank (from its side) that…, 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:
Pawn on the 3rd or 4th rank (from its side) that is undefended by its own side and attacked by the opponent.
This pattern fires in 38 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 614 to 2683, with a median rating of 1690. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_1054 |
|---|---|
| Puzzles where it fires | 38 |
| Min ELO | 614 |
| Median ELO | 1690 |
| Max ELO | 2683 |
| Coverage | 0.38% 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 zzNuy — ELO 614, themes: advancedPawn, crushing, endgame, side to move: White
- Puzzle znflB — ELO 994, themes: bishopEndgame, crushing, defensiveMove, side to move: Black
- Puzzle zyIZH_F — ELO 1055, themes: endgame, long, mate, side to move: White
- Puzzle z6Ytb_F — ELO 1460, themes: endgame, hookMate, mate, side to move: White
- Puzzle zc5Ea_F — ELO 1616, themes: advancedPawn, crushing, endgame, side to move: White
- Puzzle zkFtz — ELO 1690, themes: crushing, endgame, long, side to move: White
- Puzzle 01SN2 — ELO 1693, themes: crushing, endgame, master, side to move: Black
- Puzzle zqwAV_F — ELO 1853, themes: advancedPawn, clearance, crushing, side to move: Black
- Puzzle zpqQS_F — ELO 2213, themes: advancedPawn, crushing, endgame, side to move: Black
- Puzzle zzoES — ELO 2418, themes: advancedPawn, advantage, endgame, side to move: Black
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_1054?
Pawn on the 3rd or 4th rank (from its side) that is undefended by its own side and attacked by the opponent. 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 38 tagged puzzles (0.4% of the set), spanning Lichess ELO 614 to 2683 with a median of 1690.
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.