White has pieces defending the king's starting zone (back rank) while black has no attackers on that zone.
SAE concept sae_12759 fires when white has pieces defending the king's starting zone (back rank) while black has no attackers on that zone.. It appears in 637 of 9,950 Climbchess puzzles (6.4%), spanning ELO 615–2649 (median 1468).
Free forever · no email · no signup · delete data anytime.
This page documents White has pieces defending the king's starting…, 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:
White has pieces defending the king's starting zone (back rank) while black has no attackers on that zone.
This pattern fires in 637 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 615 to 2649, with a median rating of 1468. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_12759 |
|---|---|
| Puzzles where it fires | 637 |
| Min ELO | 615 |
| Median ELO | 1468 |
| Max ELO | 2649 |
| Coverage | 6.40% 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 zLpuK — ELO 615, themes: attraction, kingsideAttack, mate, side to move: White
- Puzzle 01YhI_F — ELO 816, themes: crushing, endgame, fork, side to move: Black
- Puzzle zzqqd_F — ELO 933, themes: kingsideAttack, mate, mateIn2, side to move: White
- Puzzle zvJAx_M — ELO 1109, themes: long, mate, mateIn3, side to move: White
- Puzzle zzxaZ_M — ELO 1230, themes: advantage, endgame, fork, side to move: White
- Puzzle zg1Ce — ELO 1468, themes: advantage, master, middlegame, side to move: Black
- Puzzle zy1zG_F — ELO 1709, themes: advantage, defensiveMove, middlegame, side to move: White
- Puzzle zYcJS_F — ELO 1918, themes: advancedPawn, crushing, middlegame, side to move: White
- Puzzle q9WCD — ELO 2110, themes: arabianMate, endgame, mate, side to move: Black
- Puzzle wSpLi — ELO 2311, themes: endgame, hookMate, mate, 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_12759?
White has pieces defending the king's starting zone (back rank) while black has no attackers on that zone. 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 637 tagged puzzles (6.4% of the set), spanning Lichess ELO 615 to 2649 with a median of 1468.
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.