White pawn on the 3rd or 4th rank in a passed-pawn endgame, with both kings actively contesting the promotion path.
SAE concept sae_5279 fires when white pawn on the 3rd or 4th rank in a passed-pawn endgame, with both kings actively contesting the promotion path.. It appears in 43 of 9,950 Climbchess puzzles (0.4%), spanning ELO 676–2652 (median 2045).
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This page documents White pawn on the 3rd or 4th rank in a…, 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 or 4th rank in a passed-pawn endgame, with both kings actively contesting the promotion path.
This pattern fires in 43 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 676 to 2652, with a median rating of 2045. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_5279 |
|---|---|
| Puzzles where it fires | 43 |
| Min ELO | 676 |
| Median ELO | 2045 |
| Max ELO | 2652 |
| Coverage | 0.43% 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 xOcXH — ELO 676, themes: crushing, endgame, long, side to move: White
- Puzzle zAE7m_F — ELO 936, themes: crushing, endgame, pawnEndgame, side to move: Black
- Puzzle zpo0D — ELO 1368, themes: crushing, endgame, pawnEndgame, side to move: White
- Puzzle zzrSi_F — ELO 1591, themes: crushing, endgame, long, side to move: Black
- Puzzle zzIE3 — ELO 2016, themes: advancedPawn, crushing, endgame, side to move: White
- Puzzle zeTro_F — ELO 2045, themes: crushing, defensiveMove, endgame, side to move: White
- Puzzle zxl4E_M — ELO 2072, themes: advancedPawn, advantage, endgame, side to move: White
- Puzzle zzMhe_F — ELO 2142, themes: advancedPawn, bishopEndgame, crushing, side to move: White
- Puzzle zpmQR_F — ELO 2252, themes: crushing, endgame, master, side to move: Black
- Puzzle zuZWg — ELO 2531, themes: crushing, endgame, long, 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_5279?
White pawn on the 3rd or 4th rank in a passed-pawn endgame, with both kings actively contesting the promotion path. 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 43 tagged puzzles (0.4% of the set), spanning Lichess ELO 676 to 2652 with a median of 2045.
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.