A contested square on the 5th rank where white has or is about to place a piece, with black applying pressure.
SAE concept sae_18946 fires when a contested square on the 5th rank where white has or is about to place a piece, with black applying pressure.. It appears in 41 of 9,950 Climbchess puzzles (0.4%), spanning ELO 1077–2598 (median 2011).
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This page documents A contested square on the 5th rank where white…, 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 contested square on the 5th rank where white has or is about to place a piece, with black applying pressure.
This pattern fires in 41 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 1077 to 2598, with a median rating of 2011. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_18946 |
|---|---|
| Puzzles where it fires | 41 |
| Min ELO | 1077 |
| Median ELO | 2011 |
| Max ELO | 2598 |
| Coverage | 0.41% 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 zzbZA — ELO 1077, themes: crushing, discoveredAttack, endgame, side to move: White
- Puzzle 01YpY_F — ELO 1196, themes: advantage, discoveredAttack, endgame, side to move: White
- Puzzle 00Bp0_M — ELO 1234, themes: advantage, capturingDefender, middlegame, side to move: Black
- Puzzle zys4h — ELO 1918, themes: crushing, defensiveMove, endgame, side to move: White
- Puzzle 01312 — ELO 1969, themes: crushing, defensiveMove, endgame, side to move: Black
- Puzzle zzTv6_M — ELO 2011, themes: advancedPawn, crushing, deflection, side to move: White
- Puzzle 01nj2 — ELO 2066, themes: advantage, long, middlegame, side to move: White
- Puzzle 00ZSu_M — ELO 2143, themes: advantage, endgame, rookEndgame, side to move: Black
- Puzzle za3nZ_M — ELO 2274, themes: crushing, defensiveMove, endgame, side to move: Black
- Puzzle zytyZ — ELO 2332, themes: crushing, long, middlegame, 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_18946?
A contested square on the 5th rank where white has or is about to place a piece, with black applying pressure. 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 41 tagged puzzles (0.4% of the set), spanning Lichess ELO 1077 to 2598 with a median of 2011.
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.