A passed pawn on the 5th rank is defended by a friendly piece and not under immediate attack.
SAE concept sae_12282 fires when a passed pawn on the 5th rank is defended by a friendly piece and not under immediate attack.. It appears in 60 of 9,950 Climbchess puzzles (0.6%), spanning ELO 666–2680 (median 1497).
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This page documents A passed pawn on the 5th rank is defended by 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:
A passed pawn on the 5th rank is defended by a friendly piece and not under immediate attack.
This pattern fires in 60 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 666 to 2680, 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_12282 |
|---|---|
| Puzzles where it fires | 60 |
| Min ELO | 666 |
| Median ELO | 1497 |
| Max ELO | 2680 |
| Coverage | 0.60% 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 z8Zl7 — ELO 666, themes: crushing, deflection, endgame, side to move: Black
- Puzzle 01xXd — ELO 867, themes: crushing, endgame, fork, side to move: White
- Puzzle zAE7m — ELO 936, themes: crushing, endgame, pawnEndgame, side to move: White
- Puzzle zkkBO — ELO 1187, themes: crushing, defensiveMove, endgame, side to move: White
- Puzzle zx7wb — ELO 1385, themes: crushing, endgame, short, side to move: White
- Puzzle zzpR3_F — ELO 1497, themes: crushing, defensiveMove, endgame, side to move: Black
- Puzzle zxSVI_F — ELO 1741, themes: crushing, endgame, master, side to move: White
- Puzzle zPT0y — ELO 2070, themes: crushing, endgame, long, side to move: White
- Puzzle zX40f — ELO 2349, themes: crushing, endgame, long, side to move: Black
- Puzzle zzfwZ — ELO 2526, themes: crushing, defensiveMove, 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_12282?
A passed pawn on the 5th rank is defended by a friendly piece and not under immediate attack. 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 60 tagged puzzles (0.6% of the set), spanning Lichess ELO 666 to 2680 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.