## Sunday, January 04, 2009

### The twelve puzzles of Xmas

White to play and mate in:

(a) half a move
(b) a third of a move
(c) a fifth of a move

Anonymous said...

The only 1/2-move problem I have seen before involved removing the captured en-passant pawn. On those lines:
(a) 1. Qb7# - releasing the queen which was previously picked up.
(b) 1. Qd8# - replacing the pawn which advanced from d7.
(c) 1. Qd8# - replacing the pawn which captured from e7.

But I don't like my (b), as using the same mathematics as (a) and (c) gives a different result: Pick up the d7-pawn, release on d8, pick up the d8-pawn, finally releasing the new queen is 1/4 of a move and not 1/3.

Maybe someone else has a better answer?

Anonymous said...

Completely and utterly confused.

Neill Cooper said...

I think this one is a bit too under-speciifed for me to solve. The only half moves I know are Castles. I could say a) Qd8 (from f6); b) Qd8 (from g5) c) Qd8 (from d3).

Still, thanks for all the 12problems, which I have enjoyed

Anonymous said...

Absorbing puzzle series, EJH.

Like Neill I am flummoxed by this one. Can you tell us the answer?

Angus

ejh said...

Yes, sorry, I've been ill for a few days but I'll try and get my act together tomorrow and give the solution and sources.

(I should note that it's not a very serious solution.)

Anonymous said...

Well, I guess 2-piece puzzles are a little short on the ground...

Angus

ejh said...