A lone rook in an endgame position separated from its king, typically on the back rank or second rank.
SAE concept sae_25092 fires when a lone rook in an endgame position separated from its king, typically on the back rank or second rank.. It appears in 71 of 9,950 Climbchess puzzles (0.7%), spanning ELO 632–2683 (median 1329).
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This page documents A lone rook in an endgame position separated…, 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 lone rook in an endgame position separated from its king, typically on the back rank or second rank.
This pattern fires in 71 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 632 to 2683, with a median rating of 1329. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_25092 |
|---|---|
| Puzzles where it fires | 71 |
| Min ELO | 632 |
| Median ELO | 1329 |
| Max ELO | 2683 |
| Coverage | 0.71% 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 zujzx — ELO 632, themes: crushing, endgame, hangingPiece, side to move: Black
- Puzzle zzf0W_F — ELO 849, themes: backRankMate, endgame, mate, side to move: White
- Puzzle zEzmn — ELO 910, themes: doubleBishopMate, mate, mateIn1, side to move: Black
- Puzzle zAuJY_F — ELO 1021, themes: crushing, defensiveMove, endgame, side to move: Black
- Puzzle zn7Ji — ELO 1086, themes: crushing, defensiveMove, endgame, side to move: White
- Puzzle zzE0P_F — ELO 1329, themes: advantage, endgame, hangingPiece, side to move: White
- Puzzle zx1EE_M — ELO 1460, themes: crushing, defensiveMove, endgame, side to move: Black
- Puzzle zitA3_F — ELO 2030, themes: crushing, defensiveMove, endgame, side to move: Black
- Puzzle zxwPa_M — ELO 2083, themes: crushing, defensiveMove, endgame, side to move: Black
- Puzzle zyjjC_F — ELO 2487, themes: crushing, endgame, hangingPiece, 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_25092?
A lone rook in an endgame position separated from its king, typically on the back rank or second rank. 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 71 tagged puzzles (0.7% of the set), spanning Lichess ELO 632 to 2683 with a median of 1329.
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.