Arabian mate is a rook check beside a cornered king, with a knight protecting the rook and covering the king's remaining escape square. In this position, 1.Rh7# works because the knight on f6 guards h7 and g8. A rook move that looks almost the same can instead give Black a draw.
Use Back and Forward to compare the start with the finish. Copy either FEN to examine the position yourself. Then continue from the exact starting setup on the full Play Positions board. The lesson has one verified move; open practice starts at the beginning and does not prescribe an opponent's reply.
Interactive lesson
Find the protected rook check
White to move: which rook move is mate?
The black king is on h8. The knight on f6 covers h7 and g8, but the rook still needs to give check. Compare Rh7 with the tempting moves Rc7 and Rg7 before pressing Forward.
7k/1R6/5N2/8/8/8/8/K7 w - - 0 1Finish the corner position
Continue from the starting setup and calculate the game from the board in front of you. Choose a supported opponent and play to the natural result.
What does the knight do in Arabian mate?
Look at the three squares beside Black's king on h8: g8, g7, and h7. White's knight on f6 attacks g8 and h7. The rook can reach h7 from b7 along the open seventh rank. After Rh7#, that rook checks the king on the h-file and controls g7. Together, the two pieces cover every exit.
The knight has two different jobs. Its attack on g8 prevents an escape. Its attack on h7 protects the rook, so the black king cannot capture the checking piece. This protection is the detail to check before calling a corner rook move mate. The white king on a1 is present to make a legal position; it does not help the local mating net.
Starting FEN: 7k/1R6/5N2/8/8/8/8/K7 w - - 0 1. This is a composed four-piece teaching setup, not a historical game. Chess.js verifies 1.Rh7# and the terminal checkmate. Lichess Syzygy classifies the start as a White win and lists Rh7# as mate in one.
Check the move, then check every reply
From the start, trace the rook's clear route from b7 to h7. On h7 it attacks h8 directly. Black cannot step to g8 because the knight controls that square, cannot step to g7 because the rook controls it, and cannot capture on h7 because the knight protects the rook. Chess.js gives Black zero legal moves while in check, so the result is checkmate.
A name is not proof of mate. If the knight were moved or captured before the rook arrived, its protection and escape-square control would have to be counted again. In a fuller game, also ask whether a defender can block the rook's route or capture the rook before it lands. This four-piece position isolates the geometry; it does not claim that every rook-and-knight attack is forced.
Two rook moves that fail the test
1.Rc7? forgets the check
The rook on c7 still controls g7, and the knight still covers g8 and h7. Black has no legal king move, but the rook does not attack h8. Black is not in check. Chess.js and Syzygy both classify this as stalemate, a draw. Before celebrating a trapped king, ask whether your move actually gives check.
1.Rg7? leaves the rook loose
The rook on g7 is next to the corner, but the knight on f6 does not defend g7. Black can play 1...Kxg7. Syzygy classifies that rook move as a draw. Check the rook's landing square, not just the king's flight squares.
Even a check may fall short: 1.Rb8+ allows 1...Kg7. The useful question is not simply "Can my rook check?" It is "After this check, can the king move, capture, or block?"
Corner, knight, protected rook. Count the two flight squares, then make sure the checking rook lands on a square the knight guards. Finally verify that the king is in check and has no legal reply.
Practise the finish
Go Back to the starting board and name the knight's two target squares without using Forward. Try to explain why Rc7 draws and Rg7 allows a capture. Then choose Defender Bot or Beginner Teacher and play White from the original FEN. The full Play Positions board keeps its normal opponent controls and ends the game if checkmate or a draw occurs. Respond to the position you see; no bot line is promised.
Compare this corner finish with Anastasia's mate, where the knight locks an edge king and a sacrifice clears a rook file. The back-rank mate lesson asks a different escape-square question. For mixed positions, visit the tactics trainer or set up a position in Play Positions.
Verification: Olivers Grants wrote this lesson and Uldis Briedis reviewed its technical implementation. Chess.js 1.4.0 loaded the starting FEN, replayed the mate, and checked the alternatives. The four-piece positions are eligible for exact Lichess Syzygy checks. Source links below explain the named pattern and provide the tablebase result.