1.f4 and now (a)1… Bxf5 2.Bxf6 gxf6 3.Qe4 wins B because of mate threat at h7. (b)1… Bd6 2.Bxf6 gxf6 3.Qd3 again wins a piece. (c)1…g4 2.fxe5 again wins a piece.
One can see immediately that taking the knigt on f6 would be advantageous for white, if Black could be forced to take back with Pg7. So my suggestion is 1. f4 and no matter where the bishop goes, Black loses a piece: 1. … Bd6 1. … Bxf4 2. Bxf6 gxf6 3. Qe4 (threatens Qh7#) f5 4. Qxf4 +- 2. Bxf6 gxf6 3. Qd6 f5 4. Qxd6 +-
1.f4! >A-1…Bxf4.2.Bxf6!.gxf6.3.Qe4!.f5 (forced else 4.Qh7#).4.Qxf4 wins a piece with a continuing attack against the black king. >B-1…Bd6.2.Bxf6!.gxf6.3.Qd3!.f5 forced else mate.4.Qxd6 winning a piece and the game. >C-1…g5.2.fxe5!.gxh.3.exf6! again a piece up with a deadly attack.
f4 followed by Bf6 and Qe4
1. f4 Bf4 (if … Bd6, 2. Bf6 gf6 3. Qd3+-)
2. Bf6 gf6
3. Qe4+-
1.f4
and now
(a)1… Bxf5 2.Bxf6 gxf6 3.Qe4 wins B because of mate threat at h7.
(b)1… Bd6 2.Bxf6 gxf6 3.Qd3 again wins a piece.
(c)1…g4 2.fxe5 again wins a piece.
1. f4 Bxf4
2. Qe4
threatens mate on h7 and wins the bishop
1. f4! Bxf4 (1. …Bd6 2. Bxf6 gxf6 3. Qd3 f5 5. Qxd6 +-)
2. Bxf6 gxf6
3. Qe4 f5
4. Qxf4 +-
One can see immediately that taking the knigt on f6 would be advantageous for white, if Black could be forced to take back with Pg7. So my suggestion is
1. f4 and no matter where the bishop goes, Black loses a piece:
1. … Bd6
1. … Bxf4
2. Bxf6 gxf6
3. Qe4 (threatens Qh7#) f5
4. Qxf4 +-
2. Bxf6 gxf6
3. Qd6 f5
4. Qxd6 +-
1. f4!
If 1…Bxf4
2. Bxf6 gxf6
3. Qe4 (threatening Qh7#) and winning the bishop.
If 1…Bd6
2. Bxf6 gxf6
3. Qd3 (again threatening Qh7#) and winning the bishop
1.f4!
>A-1…Bxf4.2.Bxf6!.gxf6.3.Qe4!.f5 (forced else 4.Qh7#).4.Qxf4 wins a piece with a continuing attack against the black king.
>B-1…Bd6.2.Bxf6!.gxf6.3.Qd3!.f5 forced else mate.4.Qxd6 winning a piece and the game.
>C-1…g5.2.fxe5!.gxh.3.exf6! again a piece up with a deadly attack.
Harry
1.f4! wins a piece:
1…Bxf4 2.Bxf6 gf 3.Qe4, or
1…Bd6 2.Bxf6 gf 3.Qd3
what happens after 1. rd7 ?