King on or near the back rank in an exposed position, often with threats of back rank mate or geometric mating patterns.
SAE concept sae_2605 fires when king on or near the back rank in an exposed position, often with threats of back rank mate or geometric mating patterns.. It appears in 126 of 9,950 Climbchess puzzles (1.3%), spanning ELO 626–2695 (median 1230).
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This page documents King on or near the back rank in an exposed…, 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:
King on or near the back rank in an exposed position, often with threats of back rank mate or geometric mating patterns.
This pattern fires in 126 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 626 to 2695, with a median rating of 1230. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_2605 |
|---|---|
| Puzzles where it fires | 126 |
| Min ELO | 626 |
| Median ELO | 1230 |
| Max ELO | 2695 |
| Coverage | 1.27% 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 ze1m3 — ELO 626, themes: endgame, long, mate, side to move: White
- Puzzle xVnVr_M — ELO 698, themes: crushing, defensiveMove, endgame, side to move: Black
- Puzzle xxINJ_M — ELO 832, themes: advantage, clearance, endgame, side to move: White
- Puzzle 00FON_F — ELO 936, themes: crushing, endgame, knightEndgame, side to move: Black
- Puzzle zJGoD — ELO 1111, themes: advancedPawn, crushing, endgame, side to move: White
- Puzzle yKEYq — ELO 1230, themes: arabianMate, endgame, master, side to move: White
- Puzzle 01BUa_M — ELO 1514, themes: advancedPawn, crushing, endgame, side to move: White
- Puzzle zd3A9 — ELO 1938, themes: endgame, hookMate, mate, side to move: Black
- Puzzle zcESo_F — ELO 2060, themes: advancedPawn, crushing, endgame, side to move: Black
- Puzzle zxQ8A — ELO 2317, themes: advantage, endgame, quietMove, 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_2605?
King on or near the back rank in an exposed position, often with threats of back rank mate or geometric mating 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 126 tagged puzzles (1.3% of the set), spanning Lichess ELO 626 to 2695 with a median of 1230.
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.