The king is on the back rank and is attacked by at least one enemy piece, with no friendly pieces defending it.
SAE concept sae_598 fires when the king is on the back rank and is attacked by at least one enemy piece, with no friendly pieces defending it.. It appears in 169 of 9,950 Climbchess puzzles (1.7%), spanning ELO 675–2692 (median 1429).
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This page documents The king is on the back rank and is attacked by…, 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:
The king is on the back rank and is attacked by at least one enemy piece, with no friendly pieces defending it.
This pattern fires in 169 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 675 to 2692, with a median rating of 1429. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_598 |
|---|---|
| Puzzles where it fires | 169 |
| Min ELO | 675 |
| Median ELO | 1429 |
| Max ELO | 2692 |
| Coverage | 1.70% 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 zmWwx — ELO 675, themes: advancedPawn, endgame, hangingPiece, side to move: Black
- Puzzle zrmSZ — ELO 851, themes: crushing, defensiveMove, endgame, side to move: White
- Puzzle 01zLs — ELO 1025, themes: endgame, mate, mateIn1, side to move: Black
- Puzzle zwBMB_M — ELO 1211, themes: advantage, defensiveMove, endgame, side to move: White
- Puzzle 01UeQ_M — ELO 1312, themes: advantage, long, middlegame, side to move: White
- Puzzle zuzGu — ELO 1429, themes: advantage, endgame, hangingPiece, side to move: White
- Puzzle yk3fv_F — ELO 1660, themes: crushing, endgame, long, side to move: Black
- Puzzle zymhO — ELO 1766, themes: advantage, defensiveMove, endgame, side to move: White
- Puzzle zxuQL — ELO 2043, themes: crushing, defensiveMove, endgame, side to move: White
- Puzzle zBPbA — ELO 2312, themes: advancedPawn, advantage, defensiveMove, 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_598?
The king is on the back rank and is attacked by at least one enemy piece, with no friendly pieces defending it. 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 169 tagged puzzles (1.7% of the set), spanning Lichess ELO 675 to 2692 with a median of 1429.
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.