most engines do not play ECO code E itself

[Matthias Gemuh]

E eco is when white plays pawn C2-C4 early.

http://en.wikipedia.org/wiki/List_of_chess_openings

no engine played after 1.e4 the move 1...c5.
at this short timecontrol.

An early c2-c4 without book is hardly played because it neither develops a piece, nor gets engine closer to O-O. It basically just wastes time and makes O-O-O unattractive.

Matthias.

[Togga]

but some engines can play early c4 like philou, tytan, nesik, gosu ect.

[Matthias Gemuh]

but some engines can play early c4 like philou, tytan, nesik, gosu ect.

The reason can be that the authors don't care much about opening rules and/or expect opening books to be used.

[Togga]

it is not wrong to play early c4. ask Kasparov. look at an opening book, look at the games of chess grandmasters.

[Togga]

what about the chess opening 1.c4 english?!

http://en.wikipedia.org/wiki/English_Opening

[Dann Corbit]

i made some engines matches at timecontrol 1min + 1sec without openings books. most engines did not play the opening code E itself.
{snip}

Hence the need for an 'opening book' because despite their mighty brains, sometimes we know better than they do, especially at fast time control.

At correspondence time control, the strongest engines rarely do anything dumb, even in the opening but will occasionally meander aimlessly in locked positions.