Problem 0506910

Problem 0506910

Wandle
Wandle
May 12, 2016, 2:01 PM |
2

Problem 0506910 Tactics Analysis Board

White to play. 

White is winning, but what is the quickest way?

Here I think Ncb5 is if anything  stronger than Ndb5 (given as the correct answer), as in some lines it leads to win of Q or mate. Look at these variations:

After 1 Ncb5:

(a) 1 ... axb5  2 Nxb5 gives the same position as 1 Ndb5 axb5;

(b) 1 ... Qb8  2 Nxe6 fxe6  3 Nd6+ Kd8  4 Nf7+ Ke8  5 Nxh8 is no slower than 1 Ndb5 axb5;

(c) 1 ... Qb8  2 Nxe6 axb5  3 Bf4 d6  4 Bxd6 Qa7  5 Nc7+ Ke8  6 Bc5+ wins the Q;

(d) 1 ...Qb6  2 Nf5 Qa5  3 Nbd6+ Kd8  4 Nxf7+ Kc7  5 Qd6#;

(e)  1 ...Qb6  2 Nf5 Qa5  3 Nfd6+ Kd8  4 Nxf7+ Ke8  5 Nbd6#;

(f) 1 ... Qc5  2 Nxe6 forces mate or win of Q;

(g) 1 ... Qe5  2 Bf4 Qxf4  3 Nxe6 fxe6  4 Nd6+ Kd8  5 Qd4 Ng6  6 g3 Qf6  7 Qb6+ Ke7  8 Rad1

 


Black is now two pieces up, but his pieces are stymied and White's attack seems very promising.

Anyone see a flaw in the above analysis?