help bot wrote:
On Jun 26, 11:12 am, Taylor Kingston
wrote:

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 O-O 5. e5 {
I'm not sure if I have seen this before. I suppose it'll just
transpose.}

Last I checked, 5.e5 is considered premature and inferior

It doesn't have a particularly good record in match play either with a
score of only 35% out of 24 games. Engines do seem to like it though.

Most of the popular book lines have a 60% score.

Interestingly, my older version of Rybka likes
5. e5 better than any of the alternatives, and
follows up essentially as in the game. (The
engine is thinking on its own, with no book
installed.)

Shredder at 17 ply also prefers 5. e5 0.81/17 to the normal book lines.
But only by a massive 2cp and decreasing so

5. Nf3 and 5. Be2 at 0.79/17 are very close behind and in line with
classical theory. 10cp behind them is

5. Bg5 0.71/17
Then
5. h3 0.58
5. Bd3 0.58 (both of these have been played with decent results)

And then the first novelty which isn't in my database.

5. Rb1 (though I can't see the point of this)

26/40 moves score positive.

At 18 ply it prefers 5. Nf3 0.84 then 5. Be2 0.84 with 5. e5 0.78
trailing and the same order occurs at ply 19 after an hour.

How deep did you let Rybka go?

Rather than see this as White's center quick-
ly collapsing (as described by one fellow here),
Rybka sees it as merely trading one advantage
for another. Without p-f4, White's massive
wall of central pawns must collapse.

Matches where 5. e5 have been played have not generally gone well for
white. The popular choices yield 60% score (vs 35% for e5). As a pure
curiosity 5. g5 manages 100% out of just 2 games played.

Regards,
Martin Brown

Martin Brown wrote:

Apologies for following up my own post but the engine is still running
and at ply 20 after 3 hours the results are looking increasingly like
the conventional wisdom. Namely

0.79 Nf3
0.79 Be2
0.71 Bg5
0.61 Be3
0.60 e5
0.59 Bf4

(AFAIK Bf4 has not been played so is a potential novelty here)

At 18 ply it prefers 5. Nf3 0.84 then 5. Be2 0.84 with 5. e5 0.78
trailing and the same order occurs at ply 19 after an hour.

How deep did you let Rybka go?

Rather than see this as White's center quick-
ly collapsing (as described by one fellow here),
Rybka sees it as merely trading one advantage
for another. Without p-f4, White's massive
wall of central pawns must collapse.

Matches where 5. e5 have been played have not generally gone well for
white. The popular choices yield 60% score (vs 35% for e5). As a pure
curiosity 5. g5 manages 100% out of just 2 games played.

g5 is well down the list now. Scoring 0.17 and ranked 23/47

Regards,
Martin Brown