White king is on the first rank, flanked by white pieces providing cover (typical post-castling king safety structure).
SAE concept sae_21787 fires when white king is on the first rank, flanked by white pieces providing cover (typical post-castling king safety structure).. It appears in 145 of 9,950 Climbchess puzzles (1.5%), spanning ELO 658–2649 (median 1633).
Free forever · no email · no signup · delete data anytime.
This page documents White king is on the first rank, flanked by…, 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 is on the first rank, flanked by white pieces providing cover (typical post-castling king safety structure).
This pattern fires in 145 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 658 to 2649, with a median rating of 1633. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_21787 |
|---|---|
| Puzzles where it fires | 145 |
| Min ELO | 658 |
| Median ELO | 1633 |
| Max ELO | 2649 |
| Coverage | 1.46% 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 zvNYI — ELO 658, themes: crushing, endgame, fork, side to move: White
- Puzzle zzxhB — ELO 965, themes: endgame, mate, mateIn1, side to move: Black
- Puzzle 00Q4m_F — ELO 1097, themes: advantage, middlegame, short, side to move: Black
- Puzzle zzO1x — ELO 1294, themes: advantage, middlegame, short, side to move: Black
- Puzzle zg1Ce_M — ELO 1468, themes: advantage, master, middlegame, side to move: Black
- Puzzle 00y0m_F — ELO 1633, themes: advancedPawn, advantage, endgame, side to move: White
- Puzzle zmJq6 — ELO 1784, themes: kingsideAttack, mate, mateIn2, side to move: White
- Puzzle zzu4x_M — ELO 1951, themes: advantage, endgame, fork, side to move: White
- Puzzle zydUd_M — ELO 2117, themes: backRankMate, mate, mateIn4, side to move: White
- Puzzle z9w2U — ELO 2274, 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_21787?
White king is on the first rank, flanked by white pieces providing cover (typical post-castling king safety structure). 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 145 tagged puzzles (1.5% of the set), spanning Lichess ELO 658 to 2649 with a median of 1633.
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.