Rook defending a passed or advanced pawn in a rook endgame under enemy pressure.
SAE concept sae_3020 fires when rook defending a passed or advanced pawn in a rook endgame under enemy pressure.. It appears in 16 of 9,950 Climbchess puzzles (0.2%), spanning ELO 795–2269 (median 2080).
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This page documents Rook defending a passed or advanced pawn in 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:
Rook defending a passed or advanced pawn in a rook endgame under enemy pressure.
This pattern fires in 16 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 795 to 2269, with a median rating of 2080. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_3020 |
|---|---|
| Puzzles where it fires | 16 |
| Min ELO | 795 |
| Median ELO | 2080 |
| Max ELO | 2269 |
| Coverage | 0.16% 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 01xBJ — ELO 795, themes: crushing, endgame, rookEndgame, side to move: Black
- Puzzle 01xBJ_F — ELO 795, themes: crushing, endgame, rookEndgame, side to move: White
- Puzzle 028i3_M — ELO 1133, themes: advantage, endgame, rookEndgame, side to move: White
- Puzzle zXP1P — ELO 1478, themes: endgame, hookMate, mate, side to move: Black
- Puzzle zXP1P_M — ELO 1478, themes: endgame, hookMate, mate, side to move: Black
- Puzzle zyaaG_F — ELO 2080, themes: crushing, endgame, long, side to move: White
- Puzzle zyaaG_M — ELO 2080, themes: crushing, endgame, long, side to move: Black
- Puzzle zHN5Q_F — ELO 2211, themes: defensiveMove, endgame, mate, side to move: Black
- Puzzle zHN5Q_M — ELO 2211, themes: defensiveMove, endgame, mate, side to move: White
- Puzzle zskJP_F — ELO 2269, themes: crushing, endgame, quietMove, 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_3020?
Rook defending a passed or advanced pawn in a rook endgame under enemy pressure. 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 16 tagged puzzles (0.2% of the set), spanning Lichess ELO 795 to 2269 with a median of 2080.
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.