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Winning blow: rook to f7 (e7·4)

Shuffle Rating 2250Theme: Chess960 twist: use the unusual starting setup of the pieces.
White to move — find the best continuation

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The tactical motive

Chess960 twist: use the unusual starting setup of the pieces.

Mate in 4: a forced checkmate in four moves — every reply is covered.

Winning tactic: there is a move that gains a decisive advantage — find it.

Difficulty 2250 ShuffleRating — expert level — few solve it at first try.

White to move — find the best continuation

Position on the board

White: king c2, rook c6 e7, bishop f4, pawn b2 f3 a4 g4.

Black: king h7, rook f7, bishop f2, pawn b5 a7.

8 white and 5 black pieces are on the board; the puzzle position arises after move 37.

Solution & explanation

Main line

37. Rxf7+ Kg8 38. Rd7 Bh4 39. Rc8+ Bd8 40. Rcxd8#

Why it works

  • Great move! rook to f7 keeps the pressure (#3).
  • rook to d7 develops smoothly.
  • Precise: rook to c8 is the top choice (#1).
  • Best move. rook to d8 is exactly what the engine plays (#).
  • The line ends in a forced mate in 4.
  • If instead Kg8, then Rd7 and you win the rook.

Types in this puzzle

Ladder mate

Two heavy pieces climb line by line, cutting off every retreat.

The ladder mate uses two heavy pieces climbing rung by rung: one cuts the king off along a line, the other checks on the next line, driving him toward the edge. It is the classic two-rook technique — check, the king retreats one rank, the other rook checks, until mate on the last rank. The only danger is the king creeping close enough to attack one of your rooks. If it does, simply slide that rook to the far side of the same line.

Mate in 4+

A long forced mating combination.

Mate in four or longer is a marathon of forcing moves where the grip must never loosen. The tools are the same: checks, double threats and sacrifices that deny the opponent a single free tempo. Do not juggle the whole tree at once — walk the main line all the way to mate first, then verify the side branches. If somewhere the defender finds one quiet move that holds, your very first move was wrong.

Endgame tactic

Tactics live in the endgame too — strike while material is scarce.

Tactics do not retire when the queens come off: forks, pins and double attacks live on in the endgame. With so little material left, every tactical loss is almost always decisive. The signs are the usual ones — undefended pieces, king and piece on one line, a pawn about to promote. Even in a "technical" ending, scan for a shot before every move, both yours and your opponent's.

About this position

These pieces come from starting position #708.

SP-708 · ThroneGuard — King on a central file (d/e) with both knights on inner files — the classic-type setup.

The king starts on d1, the rooks on a1 and h1, the queen on e1.

Castling ends where it always does: king to g1 and rook to f1 on the short side, king to c1 and rook to d1 on the long one.

The bishops stand on b1 and c1; their long diagonals reach h7 and h6 once the c- and d-pawns step aside.

One second-rank pawn starts with no defender at all: g2.

The setup belongs to the ThroneGuard family; read right to left it becomes position 446.

The engine's main line opens with d4, putting a pawn straight into the centre.

Morozov Balance Index: 51 of 100 — class B — balanced. Engine evaluation of the starting position: +26 centipawns for White (depth 50, 400 000 000 nodes).

Explore position #708

Provenance

Mined from the project's engine self-play games.

Pack 015 · SP-708

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