Puzzle zypvQ — ELO 2373
This is a White-to-move puzzle rated 2373 ELO. The first move is b2b3, tagged with 10 interpretable concepts and Lichess themes: crushing, endgame, long.
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Position
White to move. ELO 2373. Themes: crushing, endgame, long.
FEN: 8/8/7p/1p3ppP/p4k2/P1p1rP2/1PB2RK1/8 w - - 0 38
Show solution (6 ply)
Try to find the move yourself first — look for the rarest concept firing on this position before peeking. Solution sequence: b2b3 b5b4 a3b4 a4a3 c2f5 f4f5
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 Detects tactical positions involving a material imbalance or pawn-chain…, which appears in only 83 of our 9,950 puzzles (0.83%). 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 2373 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?
2373 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 b2b3.
What concepts does it train?
10 SAE-derived patterns including King actively centralised in a late endgame (pawn or minor…; Active king in a king-and-pawn endgame, often on the…; Detects tactical positions involving a material imbalance….
Can I attempt it without an account?
Yes — Climbchess requires no signup or email. Click the trainer link to play the position interactively.