White has a contested back-rank rook or a defended piece on the first rank under pressure from black.
SAE concept sae_10439 fires when white has a contested back-rank rook or a defended piece on the first rank under pressure from black.. It appears in 18 of 9,950 Climbchess puzzles (0.2%), spanning ELO 615–1980 (median 1488).
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This page documents White has a contested back-rank rook or 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:
White has a contested back-rank rook or a defended piece on the first rank under pressure from black.
This pattern fires in 18 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 615 to 1980, with a median rating of 1488. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_10439 |
|---|---|
| Puzzles where it fires | 18 |
| Min ELO | 615 |
| Median ELO | 1488 |
| Max ELO | 1980 |
| Coverage | 0.18% 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 zLpuK_M — ELO 615, themes: attraction, kingsideAttack, mate, side to move: White
- Puzzle zyyi1_M — ELO 664, themes: endgame, mate, mateIn2, side to move: Black
- Puzzle z8lkX_F — ELO 793, themes: doubleBishopMate, mate, mateIn1, side to move: White
- Puzzle zvMo3_M — ELO 1099, themes: advantage, endgame, hangingPiece, side to move: White
- Puzzle zuVwb_F — ELO 1260, themes: advantage, interference, middlegame, side to move: Black
- Puzzle yt677 — ELO 1488, themes: advantage, interference, middlegame, side to move: Black
- Puzzle yt677_F — ELO 1488, themes: advantage, interference, middlegame, side to move: White
- Puzzle 01EPu_F — ELO 1701, themes: advantage, long, middlegame, side to move: Black
- Puzzle zomJR_F — ELO 1947, themes: advantage, endgame, interference, side to move: White
- Puzzle zaa8g — ELO 1980, themes: advantage, middlegame, short, 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_10439?
White has a contested back-rank rook or a defended piece on the first rank under pressure from black. 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 18 tagged puzzles (0.2% of the set), spanning Lichess ELO 615 to 1980 with a median of 1488.
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.