The white king is on the first rank, trapped in a corner or edge square, with a mating attack imminent from the black side.
SAE concept sae_2615 fires when the white king is on the first rank, trapped in a corner or edge square, with a mating attack imminent from the black side.. It appears in 57 of 9,950 Climbchess puzzles (0.6%), spanning ELO 724–2612 (median 1816).
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This page documents The white king is on the first rank, trapped in…, 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 white king is on the first rank, trapped in a corner or edge square, with a mating attack imminent from the black side.
This pattern fires in 57 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 724 to 2612, with a median rating of 1816. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_2615 |
|---|---|
| Puzzles where it fires | 57 |
| Min ELO | 724 |
| Median ELO | 1816 |
| Max ELO | 2612 |
| Coverage | 0.57% 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 yl8i2 — ELO 724, themes: crushing, middlegame, short, side to move: Black
- Puzzle zzxWX_M — ELO 757, themes: master, mate, mateIn1, side to move: Black
- Puzzle zwDlz_M — ELO 912, themes: arabianMate, mate, mateIn1, side to move: Black
- Puzzle 00glf — ELO 1280, themes: advantage, endgame, long, side to move: Black
- Puzzle yCOvy_M — ELO 1447, themes: doubleBishopMate, kingsideAttack, mate, side to move: White
- Puzzle 029k3_F — ELO 1816, themes: crushing, discoveredAttack, discoveredCheck, side to move: White
- Puzzle ymiA2_M — ELO 1866, themes: backRankMate, deflection, fork, side to move: Black
- Puzzle zOSzQ_F — ELO 1934, themes: advantage, middlegame, skewer, side to move: Black
- Puzzle zzlly — ELO 2086, themes: advantage, defensiveMove, endgame, side to move: White
- Puzzle 01JEA — ELO 2254, themes: advantage, middlegame, sacrifice, 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_2615?
The white king is on the first rank, trapped in a corner or edge square, with a mating attack imminent from the black side. 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 57 tagged puzzles (0.6% of the set), spanning Lichess ELO 724 to 2612 with a median of 1816.
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.