Detects a back-rank square contested by a white rook or queen and the black king, typically in hook-mate or Anastasia-mate build-up patterns.
SAE concept sae_29552 fires when detects a back-rank square contested by a white rook or queen and the black king, typically in hook-mate or Anastasia-mate build-up patterns.. It appears in 7 of 9,950 Climbchess puzzles (0.1%), spanning ELO 702–2087 (median 744).
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This page documents Detects a back-rank square contested by a white…, 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 back-rank square contested by a white rook or queen and the black king, typically in hook-mate or Anastasia-mate build-up patterns.
This pattern fires in 7 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 702 to 2087, with a median rating of 744. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_29552 |
|---|---|
| Puzzles where it fires | 7 |
| Min ELO | 702 |
| Median ELO | 744 |
| Max ELO | 2087 |
| Coverage | 0.07% 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 7 puzzles spanning the rating distribution. Each links to its own page with full move list and related concepts.
- Puzzle zx2zu — ELO 702, themes: blindSwineMate, endgame, mate, side to move: White
- Puzzle zx2zu_F — ELO 702, themes: blindSwineMate, endgame, mate, side to move: Black
- Puzzle zx2zu_M — ELO 702, themes: blindSwineMate, endgame, mate, side to move: White
- Puzzle rViFX_M — ELO 744, themes: endgame, hookMate, mate, side to move: Black
- Puzzle wM7wj — ELO 1508, themes: discoveredAttack, discoveredCheck, endgame, side to move: White
- Puzzle wM7wj_F — ELO 1508, themes: discoveredAttack, discoveredCheck, endgame, side to move: Black
- Puzzle o1GHU_M — ELO 2087, themes: anastasiaMate, endgame, exposedKing, 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_29552?
Detects a back-rank square contested by a white rook or queen and the black king, typically in hook-mate or Anastasia-mate build-up patterns. 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 7 tagged puzzles (0.1% of the set), spanning Lichess ELO 702 to 2087 with a median of 744.
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.