Detects a king on the 7th or 8th rank, with the target square being a corner square on the 8th rank, often with a pawn on the 7th rank.
SAE concept sae_18683 fires when detects a king on the 7th or 8th rank, with the target square being a corner square on the 8th rank, often with a pawn on the 7th rank.. It appears in 76 of 9,950 Climbchess puzzles (0.8%), spanning ELO 614–2698 (median 1514).
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This page documents Detects a king on the 7th or 8th rank, with the…, 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 7th or 8th rank, with the target square being a corner square on the 8th rank, often with a pawn on the 7th rank.
This pattern fires in 76 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 614 to 2698, with a median rating of 1514. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_18683 |
|---|---|
| Puzzles where it fires | 76 |
| Min ELO | 614 |
| Median ELO | 1514 |
| Max ELO | 2698 |
| Coverage | 0.76% 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 zzNuy — ELO 614, themes: advancedPawn, crushing, endgame, side to move: White
- Puzzle ztYSC_F — ELO 715, themes: crushing, defensiveMove, endgame, side to move: White
- Puzzle zt9Jj_M — ELO 891, themes: advancedPawn, crushing, endgame, side to move: Black
- Puzzle zx040_M — ELO 1125, themes: advancedPawn, crushing, endgame, side to move: Black
- Puzzle zy06M_F — ELO 1247, themes: crushing, endgame, rookEndgame, side to move: White
- Puzzle 01BUa_F — ELO 1514, themes: advancedPawn, crushing, endgame, side to move: Black
- Puzzle 00ieR_M — ELO 1609, themes: advantage, endgame, long, side to move: Black
- Puzzle 01sMU_F — ELO 1816, themes: endgame, side to move: Black
- Puzzle z7RmR_F — ELO 2206, themes: advancedPawn, crushing, endgame, side to move: Black
- Puzzle zHUbg_F — ELO 2608, themes: advancedPawn, crushing, endgame, 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_18683?
Detects a king on the 7th or 8th rank, with the target square being a corner square on the 8th rank, often with a pawn on the 7th 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 76 tagged puzzles (0.8% of the set), spanning Lichess ELO 614 to 2698 with a median of 1514.
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.