[Event "?"] [Site "?"] [Date "2020.??.??"] [Round "?"] [White "Endgame study"] [Black "Mate in 11!"] [Result "*"] [Annotator "DH"] [SetUp "1"] [FEN "8/8/8/1B6/6p1/8/4KPpp/3N2kr w - - 0 1"] [PlyCount "21"] [EventDate "2020.??.??"] [SourceVersionDate "2020.05.04"] {[%evp 0,21,0,0,0,0,0,0,0,0,0,0,0,0,0,29992,29993,29994,29995,29996,29997, 29998,29999,-30000]} 1. Kd3 $1 {White's only winning move. The tricky part of this puzzle is avoiding any stalemates.} g3 (1... Kf1 {is similar to the main line, but with some different branches:} 2. Kd2+ Kg1 3. f4 (3. f3 $2 g3 $11) 3... gxf3 (3... g3 4. Bd7 $1 {transposes to the main line below:} Kf1 5. Bh3 Rg1 6. Bg4 Rh1 (6... h1=Q 7. Be2#) 7. Be2+ Kg1 8. Nc3 Kf2 9. Ne4+ Kg1 10. Ng5 Kf2 11. Nh3#) 4. Nc3 Kf2 (4... f2 5. Ne2+ Kf1 6. Nd4+ Kg1 7. Nf3#) 5. Ne4+ Kg1 {and White wins beautifully by losing a move with his king. This puts Black in zugzwang:} 6. Kc3 $1 (6. Kc2 {also works.}) (6. Bc4 {wins too, but more slowly: } f2 7. Ng5 f1=N+ $1 8. Ke1 {and checkmate next on h3.}) 6... f2 7. Ng5 f1=Q 8. Nh3#) 2. f4 ({After} 2. fxg3 $2 Kf1 {there is no way to make progress.}) 2... Kf1 3. Kd2+ Kg1 4. Bd7 $3 {The key idea. White manoeuvres the bishop around to e2 (via h3 to lose a tempo) and this keeps Black's king in a cage.} Kf1 5. Bh3 {Pinning the g2-pawn.} Rg1 {The most challenging.} (5... Kg1 {is the same:} 6. Bg4 (6. f5 {wins in a more cynical fashion.}) 6... Kf1 7. Be2+ Kg1 8. Nc3 Kf2 9. Ne4+ Kg1 10. Ng5 Kf2 11. Nh3#) 6. Bg4 Rh1 (6... h1=Q 7. Be2#) 7. Be2+ Kg1 8. Nc3 {The beginning of the next step: White's knight dances around to h3, from where it will deliver checkmate.} Kf2 9. Ne4+ Kg1 10. Ng5 Kf2 11. Nh3# *
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