7th Yerevan Open A 2025 · 2025.12.08 · Elo 2474/2527 · tactic · ★
The daily position for Monday 24 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 predicts 77% at this level.
The solution
49.♖︎xb8!△♖︎a8+(not49.♖︎e6?d450.♘︎d7♔︎xa651.♘︎xb8+♔︎xb7=)49…♔︎xb850.♘︎d7+(not50.♔︎g2?♖︎xc551.bxc5b4−+)50…♔︎c7(if50…♔︎a7then51.b8=♕︎+♔︎xa652.♕︎b6#)51.b8=♕︎+♔︎xd752.a7♖︎a3(52…♖︎c1+is as good:53.♔︎g2♖︎a154.a8=♕︎+−)53.a8=♕︎+−
49.♖︎xb8 — almost nobody finds this · the threat is ♖︎a8+ — what it plays next if the defence does nothing
50.♘︎d7+ — the natural move
51.b8=♕︎+ — the standard move
51…♔︎xd7 — forced — the only legal move
52.a7 — the standard move · the fair stop: the line may end here
53.a8=♕︎ — routine — shown for completeness, never demanded
“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
Davtyan found it · 1-0
the game ended inside the printed line — full game ↗
The field
88% of the 82 committed lines here found the key move — the model predicted 77% at this level.