White King on e1 or g1, defended by multiple own pieces and not attacked by black, typically an uncastled or freshly castled king in the opening.
SAE concept sae_664 fires when white King on e1 or g1, defended by multiple own pieces and not attacked by black, typically an uncastled or freshly castled king in the opening.. It appears in 97 of 9,950 Climbchess puzzles (1.0%), spanning ELO 610–2533 (median 1217).
Free forever · no email · no signup · delete data anytime.
This page documents White King on e1 or g1, defended by multiple own…, 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 King on e1 or g1, defended by multiple own pieces and not attacked by black, typically an uncastled or freshly castled king in the opening.
This pattern fires in 97 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 610 to 2533, with a median rating of 1217. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_664 |
|---|---|
| Puzzles where it fires | 97 |
| Min ELO | 610 |
| Median ELO | 1217 |
| Max ELO | 2533 |
| Coverage | 0.97% 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 zXEls — ELO 610, themes: mate, mateIn1, oneMove, side to move: White
- Puzzle yvTxr_F — ELO 725, themes: doubleBishopMate, mate, mateIn1, side to move: White
- Puzzle zzrpZ — ELO 907, themes: mate, mateIn1, oneMove, side to move: Black
- Puzzle v1mYz — ELO 1041, themes: doubleBishopMate, hangingPiece, mate, side to move: Black
- Puzzle zuGs4_F — ELO 1138, themes: mate, mateIn1, oneMove, side to move: White
- Puzzle ya2vD_F — ELO 1217, themes: mate, mateIn1, oneMove, side to move: White
- Puzzle ybeGl_F — ELO 1317, themes: mate, mateIn1, oneMove, side to move: White
- Puzzle 01ScQ — ELO 1690, themes: advantage, opening, short, side to move: White
- Puzzle zxk3h — ELO 1822, themes: mate, mateIn2, opening, side to move: Black
- Puzzle zd42X — ELO 2253, themes: advantage, capturingDefender, deflection, 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_664?
White King on e1 or g1, defended by multiple own pieces and not attacked by black, typically an uncastled or freshly castled king in the opening. 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 97 tagged puzzles (1.0% of the set), spanning Lichess ELO 610 to 2533 with a median of 1217.
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.