a difficult test opening position

[PauloSoare]

New game
r1bqkb1r/pp3ppp/2p2n2/2p1N3/4P3/2N5/PPPP1PPP/R1BQK2R b KQkq - 0 1

Analysis by Rybka 3:

1...Bf8-d6 2.Ne5-c4 0-0
+/= (0.29) Depth: 6 00:00:00 3kN
1...Bf8-d6 2.Ne5-c4 0-0 3.0-0 Bd6-c7
+/= (0.31) Depth: 7 00:00:00 7kN
1...Bf8-d6 2.Ne5-f3 0-0 3.0-0
+/= (0.41) Depth: 8 00:00:00 11kN
1...Bf8-d6 2.Ne5-f3 0-0 3.0-0 Qd8-c7 4.d2-d3 Bc8-e6
+/= (0.53) Depth: 9 00:00:00 19kN
1...Bf8-d6 2.Ne5-f3 0-0 3.0-0 Rf8-e8 4.d2-d3 h7-h6 5.h2-h3 Qd8-c7 6.Qd1-e2
+/= (0.51) Depth: 10 00:00:00 58kN
1...Bf8-d6 2.Ne5-f3 0-0 3.0-0 Rf8-e8 4.d2-d3 h7-h6 5.h2-h3 Qd8-c7 6.Qd1-e2
+/= (0.51) Depth: 11 00:00:01 107kN
1...Nf6xe4 2.Nc3xe4[] Qd8-d4 3.0-0 Qd4xe5 4.Rf1-e1 Bc8-e6 5.d2-d3
+/= (0.33) Depth: 11 00:00:02 228kN
1...Nf6xe4 2.Nc3xe4[] Qd8-d4 3.0-0 Qd4xe5 4.Rf1-e1 Bf8-e7 5.Ne4-g3 Qe5-c7 6.d2-d3 Bc8-e6
+/= (0.30) Depth: 12 00:00:02 320kN
1...Nf6xe4 2.Nc3xe4[] Qd8-d4 3.0-0 Qd4xe5 4.Rf1-e1 Bc8-e6 5.d2-d3 0-0-0 6.Ne4-g5 Qe5-f5 7.Ng5xe6 f7xe6 8.Qd1-e2 Rd8-e8
+/= (0.44) Depth: 13 00:00:03 421kN
1...Nf6xe4 2.Nc3xe4[] Qd8-d4 3.0-0 Qd4xe5 4.Rf1-e1 Bc8-e6 5.d2-d3 0-0-0 6.Ne4-g5 Qe5-f5 7.Ng5xe6 f7xe6 8.Qd1-e2 Rd8-e8 9.Bc1-d2 Bf8-d6 10.Bd2-c3 e6-e5 11.Qe2-e4
+/= (0.51) Depth: 14 00:00:04 649kN
1...Nf6xe4 2.Nc3xe4[] Qd8-d4 3.0-0 Qd4xe5 4.Rf1-e1 Bc8-e6 5.d2-d3 0-0-0 6.Ne4-g5 Qe5-f5 7.Ng5xe6 f7xe6 8.Qd1-e2 Rd8-e8 9.a2-a4 Bf8-d6 10.a4-a5 a7-a6 11.Bc1-d2 Rh8-f8
+/= (0.42) Depth: 15 00:00:10 1521kN
1...Nf6xe4 2.Nc3xe4[] Qd8-d4 3.0-0 Qd4xe5 4.Rf1-e1 Bc8-e6 5.d2-d3 0-0-0 6.Ne4-g5 Qe5-f5 7.Ng5xe6 f7xe6 8.Qd1-e2 Rd8-e8 9.a2-a4 Bf8-d6 10.a4-a5 a7-a6 11.Bc1-d2 Rh8-f8
+/= (0.42) Depth: 16 00:00:14 2225kN
1...Nf6xe4 2.Nc3xe4[] Qd8-d4 3.0-0 Qd4xe5 4.Rf1-e1 Bc8-e6 5.d2-d3 0-0-0 6.Ne4-g5 Qe5-f5 7.Ng5xe6 f7xe6 8.Qd1-e2 Rd8-e8 9.a2-a4 Bf8-d6 10.a4-a5 a7-a6 11.Bc1-d2 Rh8-f8
+/= (0.42) Depth: 17 00:00:24 3881kN
1...Nf6xe4 2.Nc3xe4[] Qd8-d4 3.0-0 Qd4xe5 4.Rf1-e1 Bc8-e6 5.d2-d3 0-0-0 6.Ne4-g5 Qe5-f5 7.Ng5xe6 f7xe6 8.Qd1-e2 Rd8-e8 9.a2-a4 Bf8-d6 10.a4-a5 a7-a6 11.Bc1-d2 Rh8-f8
+/= (0.42) Depth: 18 00:00:46 7427kN
1...Nf6xe4 2.Nc3xe4[] Qd8-d4 3.0-0 Qd4xe5[] 4.Rf1-e1 Bf8-e7 5.Ne4-g3 Qe5-d6 6.b2-b3 0-0 7.Bc1-b2 Rf8-e8 8.d2-d3 f7-f6 9.Qd1-d2 Bc8-e6 10.Re1-e2 Qd6-d7
+/= (0.28) Depth: 19 00:02:38 28855kN
1...Nf6xe4 2.Nc3xe4[] Qd8-d4 3.0-0 Qd4xe5[] 4.Rf1-e1 Bf8-e7 5.Ne4-g3 Qe5-d6 6.b2-b3 0-0 7.Bc1-b2 Rf8-e8 8.d2-d3 f7-f6 9.Qd1-d2 Bc8-e6 10.Re1-e2 Qd6-d7
+/= (0.28) Depth: 20 00:04:08 45830kN

(Paulo, Internet 22.02.2010)

[Togga]

hi paulo !:)

so rybka 3 is much better than 2.3.2a? i wait for rybka 4 and 5.

[PauloSoare]

hi paulo !:)

so rybka 3 is much better than 2.3.2a? i wait for rybka 4 and 5.

Yes Paul, Rybka 3 is more than 100 elo stronger than Rybka 2.3.2a.

[Togga]

can someone show the analysis of commercial chess engines?

[metax]

I think the problem is the evaluation. The engines think that White has enough compensation for the pawn (which he probably has).

Code: Select all

FEN: r1bqkb1r/pp3ppp/2p2n2/2p1N3/4P3/2N5/PPPP1PPP/R1BQK2R b KQkq - 0 6 

ChessMind:
  7/19	00:00	      59.810	127.000	+0,08	Lf8d6 Se5f3 OO OO Lc8g4 d2d3 Lg4xf3
  8/23	00:01	     178.665	165.000	+0,18	Lf8d6 d2d4 Ld6c7 Se5f3 c5xd4 Dd1xd4 OO Dd4xd8
  8/24	00:01	     321.963	187.000	+0,16	Sf6xe4 Sc3xe4 Dd8d5 OO Dd5xe4 Dd1e1 De4xe1 Tf1xe1 Lf8d6
  9/25	00:02	     510.193	200.000	+0,13	Sf6xe4 Sc3xe4 Dd8d5 Dd1e2 Dd5xe5 f2f4 De5e6 f4f5 De6e5
 10/25	00:08	   1.895.491	218.000	+0,02	Sf6xe4 Dd1e2 Se4xc3 d2xc3 Lc8e6 OO Dd8f6 Tf1d1 Ta8d8 Td1xd8+ Df6xd8

ChessMind takes the pawn but evaluates the position as balanced. You can see how narrow the difference between Bd6 and Nxe4 is (at least at depth 8): by 0.02 pawns it chooses Nxe4.

[rightrook]

Junior 5......finds it in 2 seconds

Ruffian 1.0.5....takes 25 seconds

Junior 10 does not find it.

Thanks...

Good test move..

Robert

[Togga]

do you mean black not white?

not taking the pawn is lost chess game for black.

i think some engines needs more calculating time for this very tactical position, but look at alaric 707, it plays immediately Nxe4. why? after 0 till1 second time.

[Togga]

i found this position as i played some engines tests with robbolitoo without opening book, or the position: 1.e4 c5.