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Rb7 wins; Black has no good moves and loses at least the Knight.
1.Rb7! Cleans house 1….Rxb7 2.Bxc6+ followed by 3.Bxb7
Kamalakanta
1.Rb7 Rxb7
2.Bxc6 + and Bxb7
1..Ra6 saves the black N but then black is a bishop and a passed pawn down and has a completely losing position.
Discovered checks by the black N achieve nothing.
1. Rb7!
followed by either Rxb6 or Bxc6, must win a piece.
1. … Rxb7 (Ra6 Bxc6+)
2. Bxc6+ Kf7
3. Bxb7
How I found the solution here, was by asking:
“How (other than by moving king) can I avoid to get a discovered check against me (seeming to destroy any plan) when black moves his knight?”
At the same time I wondered if a rook move in 7th rank could possibly threat a mate, this was impossible just because of the mentioned discovered check, but then my rook simply stopped on b7!
This R sack certainly does prevent a discovered check, it’s pretty enforced to take, and this simply wins a piece and the game for white.
1 Rb7 ( Rb7 2 Bc6 +-) ( Rb4 2Bc6 +-) Ra7 2 Bc6 +-
1.Rb7 is winning.
(If 1…RxR 2.BxN+ and 3.BxR)
(If R any other, 2.BxN+ Winning)
Rb7 for sure! But what about the case where, instead of Rxb7, there is a knight move? For example:
[FEN “4k3/5R2/1rnK2p1/3B2P1/4P3/8/8/8 w – – 0 0”]
1. Rb7 Na7+
2. Rxb6 Nc8+
3. Kc7 Nxb6 {White has a decisive advantage. Now, white easily can promote his pawn to a queen, after which there is an easy path to mate. It could play out as follows.}
4. Kxb6 Kd8
5. Kc6 Kc8
6. Kd6 Kb8
7. e5 Ka7
8. e6 Kb6
9. e7 Ka5
10. e8=Q Kb4
11. Qe1+ Kb5
12. Qb1+ Ka4
13. Kc5 Ka5
14. Qb5#