Here is another tactic that I got a question about via email.
This problem appears in Tactics Time Newsletter #12.
This game is between Alexander Freeman and Fred Spell, and was played at the East Coast Deli in downtown Colorado Springs in October 2009. Fred published this game in his monthly Colorado Springs Chess Night newsletter, which are really well designed.
I liked this position because white and black both have pawns that
COULD! GO! ALL! THE! WAY!
but currently both sides are preventing that from happening.
Try to figure out the answer for yourself, before reading the question and my response.
It is white to move.
In the newsletter I wrote the answer as:
48… cxd5 or exd5 49. Bxc7 followed by a8=Q
48… Nxd5 49. a8=Q
Here is the question I got:
48 Nxd5 e7!
49 BxN e8(Q)
50 a8(Q) Qa1+
51 K moves QxQ
49 NxN+ Kd7
50 a8(Q) e1(Q)
51 Nb5 maybe the best shot
51 …. Qa1+
52 Na3 Qd1+
53 Kb4 Qd2+
54 Kb3 QxB with a better game.
In the first variation you mention, 49. BxN would be a mistake. The Bishop needs to protect the e1 square, and not allow the black pawn to queen.
48. Nxd5 e2 49. Nxc7+ Bxc7 50. a8=Q+
In the second variation, the bishop just takes the queening pawn
48. Nxd5 e2 49. Nxc7 Kd7 50. a8=Q e1=Q 51. Bxe1
Thanks for the e-mail!
Here is the complete game: