[Event "?"] [Site "ICCF"] [Date "2021.07.11"] [Round "?"] [White "B+ e&f pawns vs B win"] [Black "?"] [Result "*"] [Annotator "peter"] [SetUp "1"] [FEN "8/5k2/8/4PP2/5K2/1bB5/8/8 w - - 0 1"] [PlyCount "23"] [EventDate "2011.??.??"] [SourceVersionDate "2021.06.11"] {[#]} 1. Be1 {rerouting the bishop to its best diagonal} Ba2 ({This line shows the difference between e&f pawns and f&g pawns} 1... Ke7 2. Bh4+ {this forces Black to pick which side his king goes} Kd7 {trying to block White playing Kd6 but now he heads in the other direction} (2... Kf7 3. Ke3 {is similar to the mainline}) 3. Kg5 Bf7 {This is all very staightfoward for White. But imagine the equivalent position with everything moved a file to the right - the bishop could not be on the equalivalent square so would have to be next to the pawns (on h5) or in front of the right hand pawn (on g6). Either way the king does not have an entry square, so he can't make any progress} (3... Ke7 4. Kg6+) 4. Kf6 {and White can force through e6 after which it is easy}) 2. Bh4 {when the pawns are side by side it is normally optimal to put the bishop on the diagonal that controls a square immediately in front of the pawns (in this case f6), where it also controls the critical sqaure two in front on the other pawn (in this case e7).} Bb3 3. Ke3 (3. Ke4 Bc2+ 4. Kf4 Bb3 {just repeats}) 3... Ba2 4. Kd4 Bb3 5. Kc5 Ke8 6. Kd6 Bd1 {heading for h5 so it can sac itself on f7} (6... Ba2 7. e6 Bb3 8. f6 Ba2) 7. e6 Bh5 8. f6 Bg6 9. Be1 Bh5 10. Bb4 { now the pawns have advanced, this is the correct diagonal, controlling e7 and f8} Bg6 (10... Kf8 11. Kd7+) 11. Ke5 Bh5 12. Kf5 {now Black has to give up control of f7 and it is all over.} *