Chess960 tactic on b8 (b2)
c9-14496naming tag (square·N)Opens in the app if installed, otherwise downloads the APK.
The tactical motive
Chess960 twist: use the unusual starting setup of the pieces.
Mate: a forcing sequence that ends the game — the king has no escape.
Mate in 4: a forced checkmate in four moves — every reply is covered.
Difficulty 2400 ShuffleRating — expert level — few solve it at first try.
White to move — find the best continuation
How to recognize this tactic
In Chess960 the pieces start on unfamiliar squares, so tactics appear earlier and from unusual angles. Do not trust classical patterns — read the actual lines of the bishops, the rooks and the queen from where they really stand in this position.
This is a forced mating attack. Start from the enemy king: which of its squares are already covered, and which move takes away the rest while keeping the king in check? Forcing moves — checks and captures — are what turn an attack into mate.
A mate in four is a longer forced net: each of your moves is a check or an irresistible threat, and the king is driven step by step to a square where it is finally trapped. Verify that the defender has exactly one reply at every branch.
General method: before you move, list the forcing candidates — every check, every capture, every direct threat — and calculate those first. The solution to a tactic is almost always among them.
Position on the board
White: king g1, queen b2, rook h1, bishop d2, knight f1 e6, pawn g2 d3 f3 h4.
Black: king h8, rook c4, knight f5, pawn f4 a5 h5 g6 g7.
10 white and 8 black pieces are on the board; the puzzle position arises after move 24.
The position in numbers
White are ahead by 14 points of material (27 against 13; pawn = 1, knight and bishop = 3, rook = 5, queen = 9) — the tactic has to convert or outweigh that.
The white king stands on g1, the black king on h8.
It is White to move on move 24, with 43 legal replies to weigh — only the line that keeps the advantage solves the puzzle.
White keeps 4 pawns, Black 5. Files fully open (no pawns of either colour): b, c, e — natural highways for the rooks and queen. Half-open for White: a.
The White king has 2 empty squares to step to right now — the fewer they are, the closer a mating net.
Solution & explanation
Main line
24. Qb8+ Rc8 25. Qxc8+ Kh7 26. Ng5+ Kh6 27. Qh8#
Why it works
- Best move. queen to b8 is exactly what the engine plays (#3).
- Well found: queen to c8 (#2).
- Precise: knight to g5 is the top choice (#1).
- Best move. queen to h8 is exactly what the engine plays (#).
- The line ends in a forced mate in 4.
- If instead Rc8, then Qxc8+ and you win the rook.
Move by move
- 24. Qb8+ — queen to b8 with check
- Rc8 — rook to c8
- 25. Qxc8+ — queen to c8 (capture) with check
- Kh7 — king to h7
- 26. Ng5+ — knight to g5 with check
- Kh6 — king to h6
- 27. Qh8# — queen to h8 and it is checkmate
Types in this puzzle
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.
Win the pinned piece
The pinned piece cannot run — attack it again and win it.
A pinned piece cannot flee, which means you can win it outright by attacking it one more time. Count attackers against defenders: if you outnumber them, the piece is yours. The best extra attacker is a pawn, since it costs less than anything it might capture. Do not rush the capture — build up the pressure first, then harvest.
About this position
These pieces come from starting position #392.
SP-392 · RampartGuard — A b- or g-file king and two knights on inner files (b–g).
The king starts on g1, the rooks on c1 and h1, the queen on a1.
The king already stands on its castled square, so castling short moves only the rook, from h1 to f1.
The bishops stand on b1 and e1; their long diagonals reach h7 and a5 once the c- and d-pawns step aside.
One second-rank pawn starts with no defender at all: e2.
The setup belongs to the RampartGuard family; read right to left it becomes position 765.
The engine's main line opens with Nde3, bringing the knight out to e3.
Morozov Balance Index: 34 of 100 — class C — noticeable edge. Engine evaluation of the starting position: +31 centipawns for White (depth 43, 400 000 000 nodes).
Explore position #392Provenance
Mined from the project's engine self-play games.
Pack 015 · SP-392
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