A king on the back rank under direct attack by an enemy piece, in positions where defensive resources are limited or overwhelmed.
SAE concept sae_12194 fires when a king on the back rank under direct attack by an enemy piece, in positions where defensive resources are limited or overwhelmed.. It appears in 31 of 9,950 Climbchess puzzles (0.3%), spanning ELO 895–2690 (median 1147).
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This page documents A king on the back rank under direct attack 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:
A king on the back rank under direct attack by an enemy piece, in positions where defensive resources are limited or overwhelmed.
This pattern fires in 31 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 895 to 2690, with a median rating of 1147. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_12194 |
|---|---|
| Puzzles where it fires | 31 |
| Min ELO | 895 |
| Median ELO | 1147 |
| Max ELO | 2690 |
| Coverage | 0.31% 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 y0yRS — ELO 895, themes: crushing, defensiveMove, middlegame, side to move: Black
- Puzzle 01I8x — ELO 957, themes: crushing, endgame, queenRookEndgame, side to move: White
- Puzzle zipga — ELO 1081, themes: crushing, defensiveMove, endgame, side to move: White
- Puzzle zn7Ji — ELO 1086, themes: crushing, defensiveMove, endgame, side to move: White
- Puzzle 028i3 — ELO 1133, themes: advantage, endgame, rookEndgame, side to move: White
- Puzzle 01vzt_M — ELO 1147, themes: advantage, middlegame, short, side to move: Black
- Puzzle zjkUd_M — ELO 1204, themes: crushing, defensiveMove, fork, side to move: Black
- Puzzle 028i2 — ELO 1598, themes: advantage, endgame, long, side to move: Black
- Puzzle zwdQj — ELO 1670, themes: crushing, defensiveMove, long, side to move: White
- Puzzle 016F4 — ELO 1701, themes: crushing, middlegame, veryLong, 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_12194?
A king on the back rank under direct attack by an enemy piece, in positions where defensive resources are limited or overwhelmed. 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 31 tagged puzzles (0.3% of the set), spanning Lichess ELO 895 to 2690 with a median of 1147.
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.