Originally posted by Varenka25.Nb5 allows 25...Rc6 so it's hardly better.
For position 3, 25.Nb5 is even better (though Bb5 is winning too)
Originally posted by Varenka25.Bb5 Rd5 26.Rxe5 Rd6 27.Qa8+ Qd8 28.Bxd7+ Rxd7 29.Qxa6 Qxf6 30.Qa8+ Qd8 31.Qxa4
This gives White significantly more of an advantage compared to 25.Bb5 Rd5.
25.Nb5 has the benefit of opening the d-file for White's rook.
Originally posted by tomtom232Black can do better than that against 25.Bb5...
25.Bb5 Rd5 26.Rxe5 Rd6 27.Qa8+ Qd8 28.Bxd7+ Rxd7 29.Qxa6 Qxf6 30.Qa8+ Qd8 31.Qxa4
Originally posted by Varenka26...Qxb5 27.Re1!
Black can do better than that against 25.Bb5...
25.Bb5 Rd5 26.Rxe5 Qxb5
White is winning. But in the following line, Black is getting killed more directly...
25.Nb5! Rc6 26.Rg8 axb5 27.Qg2! (threat of mate in 3)
Originally posted by tomtom23225.Bb5 Rd5 26.Rxe5 Qxb5 27.Re1 Qb7
The point is that it's not better.
Originally posted by Varenkablack will probably play ...Rxb5 in both and ...Rc8 is maybe a better defense than ...Rc6.
25.Bb5 Rd5 26.Rxe5 Qxb5 27.Re1 Qb7
25.Nb5 Rc6 26.Rg8 axb5 27.Qg2 Rg6
The first line has an eval of about 2, and the second line has an eval of 5. And you say that it's not better?
Yes, both win, but in objective analysis it's better to find more decisive lines.
Originally posted by tomtom232Check these with a good engine and you'll see some significant refutations.
black will probably play ...Rxb5 in both and ...Rc8 is maybe a better defense than ...Rc6.