Christmas Card puzzle 2011

--brrb--
--------
p-------
-------Q
-p-kpPp-
-P-pN-P-
---K----
--------

by Sam Loyd, 'Organ Pipes'

Solution in the comments!

Christmas Card puzzle 2011: solution

[Scroll down to see solution]
































1.Qa5!

Black has to move something, but the black pieces interfere with each other's key defensive lines in turn.

(1... Bd7 2. Qd5#)
(1... Be6 2. Qe5#)
(1... Bf5 2. Nxf5#)
(1... Rd6 2. Qxb4#)
(1... Rd5 2. Qxd5#)
(1... Re5 2. Qxe5#)
(1... Bc5 2. Qa1#)
(1... Bb7 2. Nf5#)

Chess Quotes

"The most important feature of the chess position is the activity of the pieces. This is absolutely fundamental in all phases of the game (opening, middlegame and especially endgame). The primary constraint on a piece's activity is the Pawn structure."
— Michael STEAN, in Simple Chess.