Detects a king on the back rank or 7th rank in rook endgames, often with the rook controlling the same or adjacent rank.
SAE concept sae_18451 fires when detects a king on the back rank or 7th rank in rook endgames, often with the rook controlling the same or adjacent rank.. It appears in 257 of 9,950 Climbchess puzzles (2.6%), spanning ELO 625–2695 (median 1306).
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This page documents Detects a king on the back rank or 7th rank in…, 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:
Detects a king on the back rank or 7th rank in rook endgames, often with the rook controlling the same or adjacent rank.
This pattern fires in 257 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 625 to 2695, with a median rating of 1306. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_18451 |
|---|---|
| Puzzles where it fires | 257 |
| Min ELO | 625 |
| Median ELO | 1306 |
| Max ELO | 2695 |
| Coverage | 2.58% 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 00aU5 — ELO 625, themes: crushing, endgame, master, side to move: Black
- Puzzle ztNft_M — ELO 850, themes: crushing, defensiveMove, endgame, side to move: White
- Puzzle ziM3H_F — ELO 896, themes: crushing, endgame, rookEndgame, side to move: Black
- Puzzle zyh9U_F — ELO 1009, themes: crushing, defensiveMove, endgame, side to move: White
- Puzzle zv1cI_M — ELO 1202, themes: crushing, endgame, hangingPiece, side to move: Black
- Puzzle 007eS — ELO 1306, themes: advantage, endgame, short, side to move: White
- Puzzle 01kWV_M — ELO 1529, themes: advantage, deflection, endgame, side to move: Black
- Puzzle 01sMU — ELO 1816, themes: endgame, side to move: White
- Puzzle zxeOG — ELO 2136, themes: crushing, deflection, endgame, side to move: Black
- Puzzle yqA7A — ELO 2417, themes: crushing, endgame, hangingPiece, 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_18451?
Detects a king on the back rank or 7th rank in rook endgames, often with the rook controlling the same or adjacent 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 257 tagged puzzles (2.6% of the set), spanning Lichess ELO 625 to 2695 with a median of 1306.
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.