A bishop on d3 (or d6 for black), unattacked by the opponent and defended by at least one friendly piece.
SAE concept sae_3227 fires when a bishop on d3 (or d6 for black), unattacked by the opponent and defended by at least one friendly piece.. It appears in 26 of 9,950 Climbchess puzzles (0.3%), spanning ELO 714–2484 (median 1353).
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This page documents A bishop on d3 (or d6 for black), unattacked 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 bishop on d3 (or d6 for black), unattacked by the opponent and defended by at least one friendly piece.
This pattern fires in 26 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 714 to 2484, with a median rating of 1353. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_3227 |
|---|---|
| Puzzles where it fires | 26 |
| Min ELO | 714 |
| Median ELO | 1353 |
| Max ELO | 2484 |
| Coverage | 0.26% 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 zX7OX — ELO 714, themes: mate, mateIn1, oneMove, side to move: Black
- Puzzle yvTxr — ELO 725, themes: doubleBishopMate, mate, mateIn1, side to move: Black
- Puzzle znaIc_F — ELO 761, themes: crushing, discoveredAttack, middlegame, side to move: Black
- Puzzle zvar7_F — ELO 793, themes: deflection, kingsideAttack, mate, side to move: Black
- Puzzle zebg4 — ELO 1095, themes: mate, mateIn1, oneMove, side to move: Black
- Puzzle 01KFo_F — ELO 1353, themes: crushing, discoveredAttack, discoveredCheck, side to move: Black
- Puzzle zlkoP_F — ELO 1766, themes: advantage, clearance, discoveredAttack, side to move: White
- Puzzle zmNts — ELO 2016, themes: clearance, crushing, middlegame, side to move: Black
- Puzzle zmNts_M — ELO 2016, themes: clearance, crushing, middlegame, side to move: Black
- Puzzle zoFFJ — ELO 2484, themes: crushing, master, 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_3227?
A bishop on d3 (or d6 for black), unattacked by the opponent and defended by at least one friendly 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 26 tagged puzzles (0.3% of the set), spanning Lichess ELO 714 to 2484 with a median of 1353.
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.