Detects a king on the back rank (rank 1 or 8) with no friendly pieces defending it and no enemy pieces attacking it.
SAE concept sae_2704 fires when detects a king on the back rank (rank 1 or 8) with no friendly pieces defending it and no enemy pieces attacking it.. It appears in 86 of 9,950 Climbchess puzzles (0.9%), spanning ELO 734–2680 (median 1405).
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This page documents Detects a king on the back rank (rank 1 or 8)…, 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 back rank (rank 1 or 8) with no friendly pieces defending it and no enemy pieces attacking it.
This pattern fires in 86 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 734 to 2680, with a median rating of 1405. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_2704 |
|---|---|
| Puzzles where it fires | 86 |
| Min ELO | 734 |
| Median ELO | 1405 |
| Max ELO | 2680 |
| Coverage | 0.86% 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 zyx20_M — ELO 734, themes: crushing, endgame, fork, side to move: Black
- Puzzle ztci8_F — ELO 931, themes: advantage, defensiveMove, endgame, side to move: Black
- Puzzle 00XCT_M — ELO 998, themes: endgame, equality, queenRookEndgame, side to move: White
- Puzzle zx040_F — ELO 1125, themes: advancedPawn, crushing, endgame, side to move: White
- Puzzle 00neh_F — ELO 1303, themes: advancedPawn, crushing, endgame, side to move: White
- Puzzle zzwh2_F — ELO 1405, themes: crushing, deflection, endgame, side to move: White
- Puzzle zvEtF — ELO 1681, themes: bishopEndgame, crushing, deflection, side to move: White
- Puzzle zlbkl_F — ELO 1909, themes: advancedPawn, crushing, endgame, side to move: White
- Puzzle zZBQa — ELO 2223, themes: crushing, endgame, long, side to move: White
- Puzzle zu7Ox — ELO 2516, themes: crushing, endgame, long, 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_2704?
Detects a king on the back rank (rank 1 or 8) with no friendly pieces defending it and no enemy pieces attacking 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 86 tagged puzzles (0.9% of the set), spanning Lichess ELO 734 to 2680 with a median of 1405.
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.