Active black rook in an endgame, often on an open file or rank, participating in interference, skewer, or mating threats.
SAE concept sae_3095 fires when active black rook in an endgame, often on an open file or rank, participating in interference, skewer, or mating threats.. It appears in 93 of 9,950 Climbchess puzzles (0.9%), spanning ELO 723–2611 (median 1626).
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This page documents Active black rook in an endgame, often on 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:
Active black rook in an endgame, often on an open file or rank, participating in interference, skewer, or mating threats.
This pattern fires in 93 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 723 to 2611, with a median rating of 1626. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_3095 |
|---|---|
| Puzzles where it fires | 93 |
| Min ELO | 723 |
| Median ELO | 1626 |
| Max ELO | 2611 |
| Coverage | 0.93% 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 zqkRF — ELO 723, themes: crushing, endgame, rookEndgame, side to move: Black
- Puzzle zy4u4_M — ELO 854, themes: advantage, endgame, fork, side to move: White
- Puzzle zZ6pr — ELO 1146, themes: advantage, attraction, deflection, side to move: Black
- Puzzle zs69b — ELO 1256, themes: crushing, endgame, hangingPiece, side to move: White
- Puzzle 01LsE_F — ELO 1407, themes: crushing, endgame, long, side to move: Black
- Puzzle znTAQ_M — ELO 1626, themes: advancedPawn, attraction, crushing, side to move: White
- Puzzle 01d0S_F — ELO 2021, themes: crushing, endgame, long, side to move: Black
- Puzzle zu4Fn_F — ELO 2210, themes: crushing, deflection, endgame, side to move: Black
- Puzzle zntZe_F — ELO 2328, themes: advantage, discoveredAttack, endgame, side to move: White
- Puzzle rstax_F — ELO 2449, 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_3095?
Active black rook in an endgame, often on an open file or rank, participating in interference, skewer, or mating threats. 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 93 tagged puzzles (0.9% of the set), spanning Lichess ELO 723 to 2611 with a median of 1626.
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.