A rook is on a back-rank square and is involved in a back-rank or skewer tactic.
SAE concept sae_12599 fires when a rook is on a back-rank square and is involved in a back-rank or skewer tactic.. It appears in 13 of 9,950 Climbchess puzzles (0.1%), spanning ELO 861–2561 (median 1185).
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This page documents A rook is on a back-rank square and is involved…, 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 rook is on a back-rank square and is involved in a back-rank or skewer tactic.
This pattern fires in 13 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 861 to 2561, with a median rating of 1185. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_12599 |
|---|---|
| Puzzles where it fires | 13 |
| Min ELO | 861 |
| Median ELO | 1185 |
| Max ELO | 2561 |
| Coverage | 0.13% 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 zdysH — ELO 861, themes: advancedPawn, backRankMate, endgame, side to move: White
- Puzzle zdysH_F — ELO 861, themes: advancedPawn, backRankMate, endgame, side to move: Black
- Puzzle zdysH_M — ELO 861, themes: advancedPawn, backRankMate, endgame, side to move: White
- Puzzle zykiH — ELO 1018, themes: endgame, mate, mateIn2, side to move: Black
- Puzzle zykiH_M — ELO 1018, themes: endgame, mate, mateIn2, side to move: Black
- Puzzle zjyU4_M — ELO 1185, themes: attraction, endgame, mate, side to move: White
- Puzzle zx7ry_M — ELO 1555, themes: crushing, endgame, long, side to move: White
- Puzzle zc7hU_M — ELO 1843, themes: advantage, deflection, endgame, side to move: White
- Puzzle zNb5I — ELO 2561, themes: advantage, clearance, middlegame, side to move: White
- Puzzle zNb5I_F — ELO 2561, themes: advantage, clearance, middlegame, 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_12599?
A rook is on a back-rank square and is involved in a back-rank or skewer tactic. 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 13 tagged puzzles (0.1% of the set), spanning Lichess ELO 861 to 2561 with a median of 1185.
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.