[Event "?"] [Site "?"] [Round "0"] [White "Philidor"] [Black "?"] [FEN "r5k1/1R6/8/5PK1/8/8/8/8 b - - 0 1"] {Black has to stop the White king from advancing, so} 1... Ra6 $1 {Diagram #} ( {Doing nothing is no good for Black} 1... Rc8 $2 2. Kg6 Rc6+ 3. f6 Rc8 (3... Rc1 4. Rb8+ Rc8 5. Rxc8#) 4. Rg7+ Kh8 (4... Kf8 5. Rh7 Kg8 6. f7+ Kf8 7. Rh8+ Ke7 8. Rxc8 {winning}) 5. Rh7+ Kg8 6. f7+ Kf8 7. Rh8+ Ke7 8. Rxc8 {winning}) 2. f6 {If White does nothing, then so can Black. This is the only chance for White to make progress} 2... Ra1 $1 { This puts distance between Black's rook and White's king.} 3. Kg6 (3. Rb8+ Kf7 4. Rb7+ Kg8 {gives White nothing}) 3... Rg1+ { Now White's king cannot hide from the checks of the Black rook} 4. Kf5 Rf1+ 5. Ke6 Re1+ $11 *