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1. Rxc8 Qxc8
2. Bxb4 Bxb4
3. Qxd5 Qf8
4. Rd1 Kg7
5. Qxf7+ Qxf7
6. Bxf7 Kxf7
7. Rd7+ it’s a winning endgame for white
One might want to look at 5.Qe5 rather than exchanging queens. A cursory look tells me it wins the b-pawn almost certainly, and black will find it difficult to avoid the exchange of queens later anyway.
1. Rc8 Qc8
2. Bb4 Bb4
3. Qd5 Qf8
4. Rd1 Kg7
5. Qe5 Kh6 [or Rf6 6.Rd7 Kh8 7.Rf7! or even Bf7!; or 6. ….Kh6 7.Qc7 g5 8.Rh7 Kg6 9.h4]
6. Bf7 Qf7
7. Qe3 Kg7
8. Qb6
The only fly in the ointment is that I am not 100% sure of the sidelines with black’s fifth move. I like those lines even better for white, but I might be missing something. Like the problem the other day, there is something to be said for simplicity of exchanging off an opponent’s queen when you have secured a strong material edge.
4.Rc1
Sorry missed 4… Bc5
1. Rxc8 Qxc8
2. Bxb4 Bxb4 (though black could choose to sacrifice its pawn structure with axb4)
3. Qxd5 Qf8
4. Rc1 Kg7
5. Qe5 Kh6
6. Bxf7 Qxf7
7. Qe3 Kg7
8. Qxb6 Kh6 (if K moves to row 8, R checks, Bishop interposes and Queen takes a pawn.)
9. Rc7 Qe1?
10. Qe3+ Qxe3
11.fxe3, Bd2?
12. Ra7?
There are a lot of lines here, but I think I could win with white…
If 2… axb4
3. Qxd4 Qf8
4. Ra1 looks great for white.
1.Rxc8 Qxc8 2.Bxb4 Bxb4 3.Qxd5 Qf8 4.Re6 Kg7 5.Qe5+ Kh6 6.Re8 Qg7 7.Bxf7 Qxf7 8.Re7 Qb3 9.Qg7+ Kg5 10.h4+ Kg4 11.Qd4+ f4 12.f3+ Kf5 (12… Kg3 13.Qf2# or 12…. Kxh4 13.Rxh7+ Kg5 14.Qe5#) 13.Qe5#
Black has 6… Re7, I should have seen that because it’s a good move against other 4.Re6 lines.