Saturday Telegraph GK X word 22,10.05

[tobergill]

27 down 5 letters,

Mountain ridge that separates the heads of opposing glacial valleys.

43 down. 7 letters.

One of the Ionian Islands opposite Peloponnese.

52 across 5 letters

Something desirable or perfect but not likely to become a reality.

21 across 4 letters.

.............Thought series of chess playing programs that later become known as BLUE.

[jan1956]

27d arete

21a ideal

[edgar stocks]

43d    kithera

21a   deep

[tobergill]

Thank you Jan 1956 and Edgar Stocks.

[BruceBP]

Kithera, but Mike has his geography in a twist again, its to the West of the Peloponnese

[Mrs Grandy]

Can Kithera also be shown as Kythera?