A contested central or pawn-chain square doubly attacked by white pieces with little or no black resistance.

By Climbchess Research · 2026-05-08 · 3 min read · Updated May 8, 2026

SAE concept sae_4347 fires when a contested central or pawn-chain square doubly attacked by white pieces with little or no black resistance.. It appears in 30 of 9,950 Climbchess puzzles (0.3%), spanning ELO 679–1851 (median 1415).

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This page documents A contested central or pawn-chain square doubly…, 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 central or pawn-chain square doubly attacked by white pieces with little or no black resistance.

This pattern fires in 30 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 679 to 1851, with a median rating of 1415. That distribution tells you whether this is a beginner cue or a master-level subtlety.

Pattern statistics

Related concepts

The five concepts most often co-firing alongside this one (Jaccard similarity over the puzzle co-occurrence graph) are:

• King manoeuvring in a pawn endgame, exploiting key squares and opposition to… — similarity 0.141
• Pawn on a light square, on the 2nd, 3rd, or 4th rank, with no white attackers… — similarity 0.116
• A vulnerable back-rank pawn or king position creates a skewer or deflection… — similarity 0.113
• Detects squares where black holds superior pawn control in zugzwang pawn… — similarity 0.100
• A locked pawn structure in a zugzwang endgame where multiple pawns on both… — similarity 0.097

Example puzzles

Below are 10 puzzles spanning the rating distribution. Each links to its own page with full move list and related concepts.

• Puzzle zSwQP_M — ELO 679, themes: crushing, defensiveMove, endgame, side to move: White
• Puzzle zu9s3_M — ELO 808, themes: crushing, discoveredAttack, endgame, side to move: Black
• Puzzle zmkRb_F — ELO 1066, themes: attraction, crushing, deflection, side to move: White
• Puzzle zkJda_F — ELO 1094, themes: crushing, endgame, pawnEndgame, side to move: White
• Puzzle zu4Fq_F — ELO 1143, themes: crushing, defensiveMove, endgame, side to move: Black
• Puzzle yzDK2 — ELO 1415, themes: crushing, endgame, long, side to move: Black
• Puzzle zsKzr — ELO 1641, themes: advantage, defensiveMove, endgame, side to move: Black
• Puzzle zmOkq — ELO 1705, themes: crushing, endgame, pawnEndgame, side to move: Black
• Puzzle zvGt2 — ELO 1765, themes: crushing, endgame, short, side to move: White
• Puzzle zpW9Z — ELO 1851, themes: crushing, endgame, long, 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).