[Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "White to play and win"]
[Black "?"]
[Result "*"]
[Annotator "peter"]
[SetUp "1"]
[FEN "8/1Pr5/1R5P/8/8/8/p7/k5K1 w - - 0 1"]
[PlyCount "21"]
[EventType "team-tourn"]
[EventRounds "15"]
[SourceVersionDate "2020.04.01"]
{[#]} {Black's defence is based on stalemate, so White must avoid that whilst
being able to stop the a-pawn from queening.} 1. b8=B $1 (1. h7 $11 {This is
perhaps the best try apart from the solution, aiming to reach the a-file with
the king. However, even this does not avoid stalemate.} Rxh7 2. b8=Q Rh1+ 3.
Kf2 Rf1+ 4. Ke3 Re1+ 5. Kd4 Rd1+ 6. Kc5 Rc1+ 7. Kb5 Rc5+ 8. Ka6 (8. Ka4 Ra5+ 9.
Kb3 Ra3+ 10. Kc2 Rc3+) 8... Ra5+) (1. b8=Q $11 Rc1+ 2. Kf2 Rc2+ 3. Ke3 Rc3+ 4.
Kd4 Rc4+ 5. Kd5 Rc5+ 6. Kd6 Rc6+ {etc}) (1. b8=R $11 Rc1+ {etc}) 1... Rc1+ 2.
Kf2 Rc2+ 3. Ke3 Rc3+ 4. Kd4 Rc4+ 5. Kd5 {And now there are several lines but
White can always wriggle out of the stalemate, e.g.} Rc5+ (5... Rd4+ 6. Ke6
Re4+ 7. Kd7 Re7+ 8. Kc6 Rc7+ 9. Kd5 Rc5+ 10. Ke6) 6. Kd6 Rd5+ (6... Rc6+ 7.
Rxc6 $18) 7. Ke7 Rd7+ (7... Re5+ 8. Bxe5#) 8. Ke6 Re7+ 9. Kd5 Rd7+ (9... Re5+
10. Bxe5#) 10. Bd6 Rd8 11. h7 $18 *