Detects a pawn promotion to queen on or near a corner square (a1, c1, f1, h1, a8, h8), typically as the decisive move in a queen endgame.
SAE concept sae_3726 fires when detects a pawn promotion to queen on or near a corner square (a1, c1, f1, h1, a8, h8), typically as the decisive move in a queen endgame.. It appears in 20 of 9,950 Climbchess puzzles (0.2%), spanning ELO 756–2025 (median 1090).
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This page documents Detects a pawn promotion to queen on or near 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:
Detects a pawn promotion to queen on or near a corner square (a1, c1, f1, h1, a8, h8), typically as the decisive move in a queen endgame.
This pattern fires in 20 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 756 to 2025, with a median rating of 1090. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_3726 |
|---|---|
| Puzzles where it fires | 20 |
| Min ELO | 756 |
| Median ELO | 1090 |
| Max ELO | 2025 |
| Coverage | 0.20% 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 016ow — ELO 756, themes: endgame, mate, mateIn1, side to move: Black
- Puzzle 016ow_M — ELO 756, themes: endgame, mate, mateIn1, side to move: Black
- Puzzle x5hEU_F — ELO 804, themes: advancedPawn, deflection, endgame, side to move: Black
- 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 zw25T — ELO 1090, themes: advancedPawn, endgame, exposedKing, side to move: White
- Puzzle zw25T_M — ELO 1090, themes: advancedPawn, endgame, exposedKing, side to move: White
- Puzzle zwtjo — ELO 1987, themes: crushing, endgame, long, side to move: White
- Puzzle zwtjo_M — ELO 1987, themes: crushing, endgame, long, side to move: White
- Puzzle zfaCq — ELO 2025, themes: discoveredAttack, discoveredCheck, 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_3726?
Detects a pawn promotion to queen on or near a corner square (a1, c1, f1, h1, a8, h8), typically as the decisive move in a queen endgame. 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 20 tagged puzzles (0.2% of the set), spanning Lichess ELO 756 to 2025 with a median of 1090.
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.