Pawn on a light square, on the 2nd, 3rd, or 4th rank, with no white attackers and no black attackers, and a black king nearby.
SAE concept sae_9536 fires when pawn on a light square, on the 2nd, 3rd, or 4th rank, with no white attackers and no black attackers, and a black king nearby.. It appears in 18 of 9,950 Climbchess puzzles (0.2%), spanning ELO 802–2188 (median 1758).
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This page documents Pawn on a light square, on the 2nd, 3rd, or 4th…, 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:
Pawn on a light square, on the 2nd, 3rd, or 4th rank, with no white attackers and no black attackers, and a black king nearby.
This pattern fires in 18 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 802 to 2188, with a median rating of 1758. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_9536 |
|---|---|
| Puzzles where it fires | 18 |
| Min ELO | 802 |
| Median ELO | 1758 |
| Max ELO | 2188 |
| Coverage | 0.18% 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 zZGI0_M — ELO 802, themes: crushing, endgame, pawnEndgame, side to move: Black
- Puzzle yzDK2 — ELO 1415, themes: crushing, endgame, long, side to move: Black
- Puzzle yzDK2_M — ELO 1415, themes: crushing, endgame, long, side to move: Black
- Puzzle 015JV_F — ELO 1719, themes: advantage, endgame, pawnEndgame, side to move: White
- Puzzle zoF42 — ELO 1758, themes: crushing, endgame, pawnEndgame, side to move: Black
- Puzzle zoF42_M — ELO 1758, themes: crushing, endgame, pawnEndgame, side to move: Black
- Puzzle zpW9Z — ELO 1851, themes: crushing, endgame, long, side to move: White
- Puzzle zyc2q — ELO 1854, themes: crushing, endgame, long, side to move: White
- Puzzle zyc2q_M — ELO 1854, themes: crushing, endgame, long, side to move: White
- Puzzle zRiv6_F — ELO 2188, 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_9536?
Pawn on a light square, on the 2nd, 3rd, or 4th rank, with no white attackers and no black attackers, and a black king nearby. 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 18 tagged puzzles (0.2% of the set), spanning Lichess ELO 802 to 2188 with a median of 1758.
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.