An advanced pawn (5th rank or beyond) for either side that is not directly attacked by an opponent's piece.
SAE concept sae_2857 fires when an advanced pawn (5th rank or beyond) for either side that is not directly attacked by an opponent's piece.. It appears in 115 of 9,950 Climbchess puzzles (1.2%), spanning ELO 684–2665 (median 1395).
Free forever · no email · no signup · delete data anytime.
This page documents An advanced pawn (5th rank or beyond) for either…, 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:
An advanced pawn (5th rank or beyond) for either side that is not directly attacked by an opponent's piece.
This pattern fires in 115 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 684 to 2665, with a median rating of 1395. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_2857 |
|---|---|
| Puzzles where it fires | 115 |
| Min ELO | 684 |
| Median ELO | 1395 |
| Max ELO | 2665 |
| Coverage | 1.16% 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 zunH0 — ELO 684, themes: crushing, endgame, short, side to move: Black
- Puzzle 01HXY — ELO 884, themes: crushing, endgame, master, side to move: White
- Puzzle zzVJf — ELO 1101, themes: crushing, endgame, master, side to move: Black
- Puzzle zdyQ6_F — ELO 1165, themes: crushing, endgame, pawnEndgame, side to move: Black
- Puzzle 023GF — ELO 1318, themes: advancedPawn, crushing, endgame, side to move: White
- Puzzle yrGId_F — ELO 1395, themes: crushing, defensiveMove, endgame, side to move: White
- Puzzle zsKzr_F — ELO 1641, themes: advantage, defensiveMove, endgame, side to move: White
- Puzzle 012wW_M — ELO 1825, themes: crushing, endgame, pawnEndgame, side to move: Black
- Puzzle 01cxS_M — ELO 2067, themes: bishopEndgame, crushing, endgame, side to move: White
- Puzzle zqnQp — ELO 2501, themes: crushing, endgame, pawnEndgame, 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_2857?
An advanced pawn (5th rank or beyond) for either side that is not directly attacked by an opponent's 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 115 tagged puzzles (1.2% of the set), spanning Lichess ELO 684 to 2665 with a median of 1395.
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.