[Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "White to play and win"]
[Black "?"]
[Result "*"]
[Annotator "peter"]
[SetUp "1"]
[FEN "8/8/8/5K2/7p/8/3N4/3B2bk w - - 0 1"]
[PlyCount "11"]
[SourceVersionDate "2020.04.01"]
{[#]} {Study by Troitsky} 1. Bf3+ Kh2 2. Nf1+ Kh3 3. Bh1 {guarding g2 and
setting up a mate} (3. Bb7 Bh2 4. Ke4 Kg2 $11 {the king escapes: bishop is
needed on h1 to gaurd g2}) (3. Ke4 Bb6 4. Bh1 Kg4) 3... Bh2 {White was
threatening Kf4 Kf3 and Bg2 mate, so Black prevents this} (3... Bb6 4. Kf4 Bc7+
5. Kf3) 4. Ke4 {but now that the bishop is on h2 it drops if Black plays Kg4,
so White can take this route to f3} Bb8 (4... Kg4 5. Nxh2+ $18) 5. Kf3 Bc7 6.
Bg2# *