Puzzle zkHO1_F — ELO 2578
This is a White-to-move puzzle rated 2578 ELO. The first move is d8d4, tagged with 10 interpretable concepts and Lichess themes: advancedPawn, crushing, endgame.
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Position
White to move. ELO 2578. Themes: advancedPawn, crushing, endgame, promotion, quietMove, veryLong.
FEN: 3Q4/p4pk1/1p4p1/8/4q2p/8/PP6/K2R4 w - - 0 32
Show solution (18 ply)
Try to find the move yourself first — look for the rarest concept firing on this position before peeking. Solution sequence: d8d4 e4d4 d1d4 g6g5 d4d1 g5g4 d1h1 h4h3 a1b1 f7f5 b1c2 f5f4 c2d3 g4g3 h1h3 g3g2 h3h4 g2g1q
Concepts that fire on this position
Our SAE pipeline tagged this position with 10 active features. Each links to a page documenting that pattern in detail.
Why this puzzle is hard
The rarest pattern firing here is Kings are in close proximity in an endgame, with one side having a material or…, which appears in only 189 of our 9,950 puzzles (1.90%). Rare patterns tend to be the bottleneck — players who haven't internalised them will fail this puzzle even when their tactical calculation is otherwise solid.
The puzzle's Lichess ELO of 2578 reflects this: solvers below that rating typically miss the cue entirely.
Similar puzzles
Puzzles sharing the most concept tags with this one — a stronger signal than theme overlap because it reflects the actual patterns Leela recognises.
Train this pattern
Click through to the Climbchess trainer to attempt the position interactively against the same Leela network that tagged it. The trainer adapts difficulty using your live concept-recognition profile — it surfaces puzzles tagged with concepts you've been missing, not random brawls.
If you want the underlying methodology, the how-it-works page walks through the SAE training run, the labelling pipeline, and the puzzle-tagging procedure end-to-end.
Frequently asked
What is the rating of this puzzle?
2578 Lichess ELO. Solvers below that rating typically miss the key cue.
Which side moves first?
White to move; the first move of the solution is d8d4.
What concepts does it train?
10 SAE-derived patterns including A queen on a contested square with White to move, under…; White Queen on the 1st or 2nd rank, unthreatened by black…; A queen actively placed on an open rank or file relative….
Can I attempt it without an account?
Yes — Climbchess requires no signup or email. Click the trainer link to play the position interactively.