A white pawn on the 4th or 5th rank that is attacked by at least one black piece and defended by at most one white piece.
SAE concept sae_5573 fires when a white pawn on the 4th or 5th rank that is attacked by at least one black piece and defended by at most one white piece.. It appears in 53 of 9,950 Climbchess puzzles (0.5%), spanning ELO 1078–2598 (median 1580).
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This page documents A white pawn on the 4th or 5th rank that is…, 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 white pawn on the 4th or 5th rank that is attacked by at least one black piece and defended by at most one white piece.
This pattern fires in 53 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 1078 to 2598, with a median rating of 1580. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_5573 |
|---|---|
| Puzzles where it fires | 53 |
| Min ELO | 1078 |
| Median ELO | 1580 |
| Max ELO | 2598 |
| Coverage | 0.53% 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 01kSp — ELO 1078, themes: bishopEndgame, crushing, discoveredAttack, side to move: White
- Puzzle zLhD5_M — ELO 1190, themes: crushing, middlegame, short, side to move: White
- Puzzle 01gGh_M — ELO 1201, themes: advancedPawn, crushing, endgame, side to move: Black
- Puzzle zu4ol_M — ELO 1422, themes: advancedPawn, advantage, deflection, side to move: White
- Puzzle 01m2g_F — ELO 1494, themes: crushing, endgame, short, side to move: Black
- Puzzle zzZcn — ELO 1580, themes: crushing, intermezzo, master, side to move: Black
- Puzzle zkPWg — ELO 1673, themes: crushing, endgame, pawnEndgame, side to move: White
- Puzzle zkE7f — ELO 1814, themes: crushing, endgame, pawnEndgame, side to move: White
- Puzzle 00XbN — ELO 2093, themes: advancedPawn, advantage, endgame, side to move: Black
- Puzzle za3nZ_F — ELO 2274, themes: crushing, defensiveMove, 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_5573?
A white pawn on the 4th or 5th rank that is attacked by at least one black piece and defended by at most one white piece. 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 53 tagged puzzles (0.5% of the set), spanning Lichess ELO 1078 to 2598 with a median of 1580.
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.