An advanced passed pawn close to promotion in an endgame, with both sides manoeuvring to support or stop it.
SAE concept sae_7953 fires when an advanced passed pawn close to promotion in an endgame, with both sides manoeuvring to support or stop it.. It appears in 62 of 9,950 Climbchess puzzles (0.6%), spanning ELO 1054–2572 (median 2199).
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This page documents An advanced passed pawn close to promotion in an…, 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 passed pawn close to promotion in an endgame, with both sides manoeuvring to support or stop it.
This pattern fires in 62 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 1054 to 2572, with a median rating of 2199. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_7953 |
|---|---|
| Puzzles where it fires | 62 |
| Min ELO | 1054 |
| Median ELO | 2199 |
| Max ELO | 2572 |
| Coverage | 0.62% 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 00Qo8 — ELO 1054, themes: endgame, side to move: Black
- Puzzle zqpr5 — ELO 1167, themes: advancedPawn, advantage, defensiveMove, side to move: Black
- Puzzle zyFs4_M — ELO 1415, themes: advancedPawn, crushing, deflection, side to move: White
- Puzzle zkkgE_M — ELO 1682, themes: advancedPawn, crushing, endgame, side to move: Black
- Puzzle zP4Oi_M — ELO 2015, themes: advancedPawn, crushing, endgame, side to move: White
- Puzzle zmeoN_M — ELO 2199, themes: advancedPawn, crushing, endgame, side to move: White
- Puzzle zBPbA_M — ELO 2312, themes: advancedPawn, advantage, defensiveMove, side to move: Black
- Puzzle zpmNy_M — ELO 2383, themes: advancedPawn, crushing, endgame, side to move: White
- Puzzle zz5DR_F — ELO 2458, themes: advancedPawn, crushing, endgame, side to move: Black
- Puzzle zgWr1_F — ELO 2475, themes: advancedPawn, crushing, endgame, 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_7953?
An advanced passed pawn close to promotion in an endgame, with both sides manoeuvring to support or stop it. 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 62 tagged puzzles (0.6% of the set), spanning Lichess ELO 1054 to 2572 with a median of 2199.
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.