A rook or queen is outnumbered on a contested square, often preceding a tactical exchange or sacrifice.
SAE concept sae_4709 fires when a rook or queen is outnumbered on a contested square, often preceding a tactical exchange or sacrifice.. It appears in 44 of 9,950 Climbchess puzzles (0.4%), spanning ELO 877–2480 (median 1407).
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This page documents A rook or queen is outnumbered on a contested…, 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 rook or queen is outnumbered on a contested square, often preceding a tactical exchange or sacrifice.
This pattern fires in 44 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 877 to 2480, with a median rating of 1407. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_4709 |
|---|---|
| Puzzles where it fires | 44 |
| Min ELO | 877 |
| Median ELO | 1407 |
| Max ELO | 2480 |
| Coverage | 0.44% 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 01sr1 — ELO 877, themes: endgame, mate, mateIn2, side to move: Black
- Puzzle 00vKn — ELO 1130, themes: endgame, mate, mateIn2, side to move: White
- Puzzle zwmQc — ELO 1185, themes: endgame, kingsideAttack, mate, side to move: Black
- Puzzle 0293j — ELO 1253, themes: crushing, endgame, long, side to move: White
- Puzzle ztpnJ_F — ELO 1311, themes: endgame, mate, mateIn2, side to move: White
- Puzzle 01LsE — ELO 1407, themes: crushing, endgame, long, side to move: White
- Puzzle xneYF — ELO 1512, themes: endgame, hookMate, mate, side to move: Black
- Puzzle r80K1_M — ELO 1571, themes: endgame, hookMate, mate, side to move: Black
- Puzzle zzTZ8_M — ELO 1754, themes: crushing, defensiveMove, long, side to move: Black
- Puzzle zfji4_M — ELO 2037, themes: advantage, attraction, deflection, 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_4709?
A rook or queen is outnumbered on a contested square, often preceding a tactical exchange or sacrifice. 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 44 tagged puzzles (0.4% of the set), spanning Lichess ELO 877 to 2480 with a median of 1407.
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.