Passed pawn endgame with at least one pawn on the 5th or 6th rank threatening promotion.
SAE concept sae_15987 fires when passed pawn endgame with at least one pawn on the 5th or 6th rank threatening promotion.. It appears in 22 of 9,950 Climbchess puzzles (0.2%), spanning ELO 967–2436 (median 1497).
Free forever · no email · no signup · delete data anytime.
This page documents Passed pawn endgame with at least one pawn on…, 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:
Passed pawn endgame with at least one pawn on the 5th or 6th rank threatening promotion.
This pattern fires in 22 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 967 to 2436, with a median rating of 1497. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_15987 |
|---|---|
| Puzzles where it fires | 22 |
| Min ELO | 967 |
| Median ELO | 1497 |
| Max ELO | 2436 |
| Coverage | 0.22% 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 zvotQ — ELO 967, themes: advancedPawn, endgame, exposedKing, side to move: Black
- Puzzle zvotQ_M — ELO 967, themes: advancedPawn, endgame, exposedKing, side to move: Black
- Puzzle zjyU4_F — ELO 1185, themes: attraction, endgame, mate, side to move: Black
- Puzzle zyx8W — ELO 1304, themes: endgame, mate, mateIn2, side to move: White
- Puzzle zyx8W_M — ELO 1304, themes: endgame, mate, mateIn2, side to move: White
- Puzzle 00KSB — ELO 1497, themes: crushing, endgame, short, side to move: Black
- Puzzle 00KSB_M — ELO 1497, themes: crushing, endgame, short, side to move: Black
- Puzzle DUayU — ELO 2106, themes: doubleBishopMate, long, mate, side to move: Black
- Puzzle ze9cp_M — ELO 2117, themes: clearance, crushing, deflection, side to move: Black
- Puzzle zw24M_F — ELO 2396, themes: clearance, crushing, long, 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_15987?
Passed pawn endgame with at least one pawn on the 5th or 6th rank threatening promotion. 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 22 tagged puzzles (0.2% of the set), spanning Lichess ELO 967 to 2436 with a median of 1497.
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.