[Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Puzzle found on Chess Tactics"]
[Black "?"]
[Result "*"]
[Annotator "Hoetmer,Michel"]
[SetUp "1"]
[FEN "8/p3B2p/4p1pb/1R6/P1pk2P1/7r/4KP1P/8 w - - 0 1"]
[PlyCount "21"]
[EventDate "2022.08.25"]
[SourceVersionDate "2022.08.25"]
{[%evp 0,21,-69,50,212,215,215,237,224,239,243,243,266,295,280,305,394,393,372,
389,433,458,476,487] [#]} 1. g5 (1. Bf6+ {The alternative doesn't bring any
dividends} Ke4 (1... e5 $4 {Totally wrong is} 2. Rxe5 $18 {and there is no
escape from the discovered check.}) 2. Rc5 Rxh2 3. Rxc4+ Kd5 4. Rd4+ Kc6 $11)
1... Bg7 2. Bf6+ Bxf6 3. gxf6 Rh4 4. Rf5 $1 {Blocks the black rooks path!} (4.
Kf3 $2 e5 5. Rb7 Rf4+ $19) 4... exf5 5. f7 Re4+ 6. Kd1 {only move for a win.} (
6. Kf1 c3 7. f8=Q c2 8. Qa3 Kc4 9. Qb2 Kd3 10. Qa3+ Kd2 11. Qd6+ $11) (6. Kf3
c3 7. f8=Q c2 8. Qb4+ Kd3 9. Qa3+ Kd2 $11) 6... c3 7. f8=Q a5 {and white wins
because his king controls the promotion square. For instance:} 8. Qd8+ Kc4 9.
Qb8 Kd3 10. Qb5+ Kd4 11. Qxa5 *