Contested or passed pawn in an endgame where pawn structure determines the outcome.
SAE concept sae_1636 fires when contested or passed pawn in an endgame where pawn structure determines the outcome.. It appears in 9 of 9,950 Climbchess puzzles (0.1%), spanning ELO 849–2623 (median 2572).
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This page documents Contested or passed pawn in an endgame where…, 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:
Contested or passed pawn in an endgame where pawn structure determines the outcome.
This pattern fires in 9 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 849 to 2623, with a median rating of 2572. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_1636 |
|---|---|
| Puzzles where it fires | 9 |
| Min ELO | 849 |
| Median ELO | 2572 |
| Max ELO | 2623 |
| Coverage | 0.09% 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 9 puzzles spanning the rating distribution. Each links to its own page with full move list and related concepts.
- Puzzle zxT4U — ELO 849, themes: crushing, endgame, fork, side to move: White
- Puzzle zxT4U_F — ELO 849, themes: crushing, endgame, fork, side to move: Black
- Puzzle zxT4U_M — ELO 849, themes: crushing, endgame, fork, side to move: White
- Puzzle 011jz — ELO 2572, themes: advantage, endgame, long, side to move: Black
- Puzzle 011jz_F — ELO 2572, themes: advantage, endgame, long, side to move: White
- Puzzle 011jz_M — ELO 2572, themes: advantage, endgame, long, side to move: Black
- Puzzle zhioD — ELO 2623, themes: crushing, defensiveMove, endgame, side to move: Black
- Puzzle zhioD_F — ELO 2623, themes: crushing, defensiveMove, endgame, side to move: White
- Puzzle zhioD_M — ELO 2623, themes: crushing, defensiveMove, 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_1636?
Contested or passed pawn in an endgame where pawn structure determines the outcome. 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 9 tagged puzzles (0.1% of the set), spanning Lichess ELO 849 to 2623 with a median of 2572.
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.