The king has at least one adjacent empty square available as an escape or manoeuvring route.
SAE concept sae_20358 fires when the king has at least one adjacent empty square available as an escape or manoeuvring route.. It appears in 77 of 9,950 Climbchess puzzles (0.8%), spanning ELO 663–2608 (median 1653).
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This page documents The king has at least one adjacent empty square…, 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 has at least one adjacent empty square available as an escape or manoeuvring route.
This pattern fires in 77 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 663 to 2608, with a median rating of 1653. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_20358 |
|---|---|
| Puzzles where it fires | 77 |
| Min ELO | 663 |
| Median ELO | 1653 |
| Max ELO | 2608 |
| Coverage | 0.77% 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 z9HTk_M — ELO 663, themes: advancedPawn, advantage, defensiveMove, side to move: White
- Puzzle Csw7L — ELO 886, themes: crushing, endgame, exposedKing, side to move: Black
- Puzzle zlrEp_M — ELO 1107, themes: crushing, endgame, master, side to move: White
- Puzzle 01OfD_F — ELO 1313, themes: advancedPawn, crushing, endgame, side to move: White
- Puzzle zypSs — ELO 1427, themes: crushing, endgame, exposedKing, side to move: White
- Puzzle 01NZA — ELO 1653, themes: crushing, defensiveMove, endgame, side to move: Black
- Puzzle zyxDV — ELO 1746, themes: advancedPawn, advantage, deflection, side to move: Black
- Puzzle zys4h_F — ELO 1918, themes: crushing, defensiveMove, endgame, side to move: Black
- Puzzle zzIE3_M — ELO 2016, themes: advancedPawn, crushing, endgame, side to move: White
- Puzzle zzoX2_F — ELO 2101, themes: crushing, defensiveMove, endgame, 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_20358?
The king has at least one adjacent empty square available as an escape or manoeuvring route. 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 77 tagged puzzles (0.8% of the set), spanning Lichess ELO 663 to 2608 with a median of 1653.
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.