[Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Mate in 5"]
[Black "?"]
[Result "*"]
[Annotator "peter"]
[SetUp "1"]
[FEN "n1rb4/1p3p1p/1p6/1R5K/8/p3p1PN/1PP1R3/N6k w - - 0 1"]
[PlyCount "9"]
[EventDate "1861.??.??"]
[SourceVersionDate "2020.04.01"]
{White would like to play Rd5/f5 to set up a quick mate with Rd1/f1 but Rc5
slows white down and prevents mate in 5 so....} 1. b4 ({White wanted to play}
1. Rf5 $2 {(or 1.Rd5) and then mate with 1.Rd1/Rf1. But} Rc5 {refutes this.
After 1.b4 the threat is real.}) 1... Rc5+ (1... f6 2. Rd5 Rc5 3. bxc5 bxc5 4.
Rd1# {illustrates the idea}) 2. bxc5 {Threatening 3.Rb1 mate} a2 3. c6 {
Re-instating the Rd5/Rf5 idea} Bc7 {this will delay the Rd5/f5 idea by a move,
leaving white with only mate in 6} 4. cxb7 {but the bishop has trapped the
knight in the corner} (4. Rf5 Bf4) (4. Rd5 Bxg3) 4... Bxg3 {or any other move}
5. bxa8=Q# *