the library · reviewed 2026-08-24

Fedoseev – Alekseev

Jerusalem Masters 2025 · 2025.12.01 · Elo 2717/2508 · tactic · ★★★★

The daily position for Saturday 22 August 2026. It is still open to solve — the grader reads your whole line, sidelines and evaluation included, before anything here is shown. Cover the solution and solve it first →

White to move. the model gives this to 1 in 11 at this level.

The solution

42.♕︎f3! (not 42.♕︎c2? ♕︎d7 43.♖︎f1 ♖︎h8 44.♗︎g5 ♗︎b8 ⩱) 42…♘︎xd4 43.♕︎h5+ ♔︎e7 44.♖︎e1+ ♔︎d8 45.♗︎g5 (not 45.♘︎xd5? ♗︎xd5 46.♕︎xd5+ ♕︎d7 47.♕︎h5 ♖︎xc5 ⩱) 45…♗︎xc5 46.♗︎xf6+ ±

42.♕︎f3 — most players miss this
43.♕︎h5+ — the standard move
44.♖︎e1+ — the natural move
45.♗︎g5 — almost nobody finds this · worth +1
46.♗︎xf6+ — the natural move

“hard to find”, “the natural move” and the rest describe how often this move is played by Maia-2, weighted across the 1500/1900/2000 audience the difficulty model is fitted on — a model of human play, not a count of anyone who solved this position.

Members can take this away as a PGN — the diagram, the verified line and their own analysis in one file, for a database, Anki or Chessable.

What happened at the board

Fedoseev found it · 0-1

the game went on 42…♘︎xh6 43.♕︎h5+ ♔︎e7 44.♖︎e1+ ♔︎d7 45.♕︎xh6 ♖︎e8 46.♕︎g7+ ♔︎c8 47.♘︎e6 ♕︎d7 48.♕︎xf6… on to move 60 · 0-1full game ↗

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