A square contested by at least one white piece and one or more black pieces, commonly arising near a king or in a mating pattern.
SAE concept sae_36204 fires when a square contested by at least one white piece and one or more black pieces, commonly arising near a king or in a mating pattern.. It appears in 56 of 9,950 Climbchess puzzles (0.6%), spanning ELO 823–2557 (median 1671).
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This page documents A square contested by at least one white piece…, 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 square contested by at least one white piece and one or more black pieces, commonly arising near a king or in a mating pattern.
This pattern fires in 56 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 823 to 2557, with a median rating of 1671. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_36204 |
|---|---|
| Puzzles where it fires | 56 |
| Min ELO | 823 |
| Median ELO | 1671 |
| Max ELO | 2557 |
| Coverage | 0.56% 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 zzree — ELO 823, themes: endgame, mate, mateIn2, side to move: White
- Puzzle 00YqR_M — ELO 908, themes: endgame, master, mate, side to move: White
- Puzzle zx6zA — ELO 1029, themes: crushing, deflection, endgame, side to move: Black
- Puzzle zTBtn_M — ELO 1159, themes: endgame, exposedKing, long, side to move: Black
- Puzzle VlN5j_F — ELO 1247, themes: doubleBishopMate, endgame, mate, side to move: Black
- Puzzle 00huW_M — ELO 1671, themes: advantage, endgame, fork, side to move: White
- Puzzle zvGt2_F — ELO 1765, themes: crushing, endgame, short, side to move: Black
- Puzzle zpxsS_M — ELO 1987, themes: backRankMate, fork, long, side to move: Black
- Puzzle zkUPP_F — ELO 2274, themes: advancedPawn, crushing, defensiveMove, side to move: Black
- Puzzle ms3u2 — ELO 2547, themes: advantage, backRankMate, endgame, 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_36204?
A square contested by at least one white piece and one or more black pieces, commonly arising near a king or in a mating pattern. 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 56 tagged puzzles (0.6% of the set), spanning Lichess ELO 823 to 2557 with a median of 1671.
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.