Onno-Movei, G. Banks 2009

[jdart]

from one of Graham Banks' tournaments
(http://talkchess.com/forum/viewtopic.ph ... 24&t=30075)

[d] 2r1kb1r/1p2n3/pqn1PR1p/3p2p1/3N3N/2P3Q1/PP4PP/R1B3K1 w - -

bm Be3. Arasan gets this but it takes a looong time (Crafty seems to be slow on this too). Onno played it with a score of +2.99.

--Jon

[Edsel Apostol]

Twisted Logic at default favors Qf2 here with a 1.x+ score though increasing King Attacks Aggression Level from 4 to 9 finds Be3 immediately. Note that the default has Be3 as the second best move in the root. This means engines will find this with a higher king attacks scoring.

Code: Select all

FEN: 2r1kb1r/1p2n3/pqn1PR1p/3p2p1/3N3N/2P3Q1/PP4PP/R1B3K1 w - - 0 1 
T20091008:
  8/29	00:00	     218.234	0	+3.37	Bc1e3 Nc6xd4 Be3xd4 g5xh4 Qg3f2 Qb6d6 Rf6f7 Qd6xe6 Ra1f1 Rh8g8 Bd4c5
  9/27	00:00	     381.181	0	+2.30	Bc1e3 Qb6xb2 Ra1f1 Qb2xc3 Nd4e2 Qc3b4 Nh4g6 Ne7xg6 Rf6xg6 d5d4 Be3c1
 10/23	00:00	     541.654	0	+2.54	Bc1e3 Qb6xb2 Ra1f1 Qb2xc3 Nd4e2 Qc3b4 Qg3f2 Bf8g7 Be3c5 Qb4xh4 g2g3 Bg7xf6 g3xh4
 11/31	00:01	     966.627	651.365	+2.78	Bc1e3 Qb6xb2 Ra1f1 Qb2xc3 Nd4e2 Qc3b4 Qg3f2 Bf8g7 Be3c5 Qb4xh4 g2g3 Bg7xf6 g3xh4 Rh8f8 h4xg5 h6xg5
 12/30	00:03	   2.103.163	679.755	+3.29	Bc1e3 Qb6xb2 Ra1f1 Qb2xc3 Nd4e2 Qc3b4 Qg3f2 Bf8g7 Be3c5 Qb4xc5 Qf2xc5 Bg7xf6 Rf1xf6 g5xh4 Ne2f4 b7b5
 13/37	00:05	   3.633.785	688.086	+2.19	Bc1e3 Qb6xb2 Ra1f1 Qb2xc3 Nd4e2 Qc3b4 Qg3f2 Bf8g7 Be3c5 Qb4xh4 g2g3 Qh4h5 Rf6f7 Ke8d8 Bc5b6+ Rc8c7 Bb6xc7+ Kd8xc7 Rf7xg7
 14/46	00:18	  13.117.854	726.268	+2.68	Bc1e3 Qb6xb2 Rf6f1 Qb2xc3 Qg3f2 Nc6e5 Ra1c1 Qc3d3 Nh4f5 Rc8xc1 Nf5d6+ Ke8d8 Rf1xc1 Ne5c4 Nd6f7+ Kd8e8 Be3xg5 h6xg5 Nf7xh8 Qd3e3 Qf2xe3 Nc4xe3 Nh8f7

[Eelco de Groot]

I can't show a very good result but at least can confirm what Edsel says, that Be3 should get high marks for King Safety I tried to bring down the nodecounts for the first move tried 1.Qd6 but so far this not a success because of the effect on later iterations these then get worse for unknown reasons. But Be3 seems to be a good move!

Eelco

2r1kb1r/1p2n3/pqn1PR1p/3p2p1/3N3N/2P3Q1/PP4PP/R1B3K1 w - -

Engine: Ancalagon 1.3 Weak Squares 180 Board Control middlegame 50 endgame 50
Build 377 (Athlon 2009 MHz, 256 MB) by Romstad, Costalba, Kiiski, de Groot

2.01 0:28 +0.17 1.Qd6 Rd8 2.Qg3 Nxd4 3.cxd4 gxh4
4.Qg4 Rd6 5.Be3 h5 6.Qh3 Kd8 7.Raf1 (11.775.171) 409

2.04 0:47 +7.01 1.Be3 gxh4 2.Qf2 Nxd4 3.Bxd4 Qc6
4.Rf7 Rg8 5.Rf1 Qxe6 (20.024.893) 424

3.01 2:02 +6.64 1.Be3 gxh4 2.Nf5 hxg3 3.Nd6+ Kd8
4.Bxb6+ Rc7 5.Nf7+ Kc8 6.Nxh8 Bg7
7.Rf7 gxh2+ 8.Kh1 Nd8 9.Rxg7 Nxe6
10.Bxc7 Nxg7 11.Be5 Ne6 12.Kxh2 (53.447.737) 436

4.01 4:22 +5.53 1.Be3 Nxd4 2.Bxd4 gxh4 3.Qxh4 Qd6
4.Qh5+ Kd8 5.Rf7 Rg8 6.Raf1 Qxe6
7.Rxf8+ Rxf8 8.Rxf8+ Kd7 9.Rf6 Qe1+
10.Rf1 Qe6 11.Be5 Ng6 12.Bf6 Ne7 (112.830.216) 430

5.01 6:16 +5.16 1.Be3 Nxd4 2.Bxd4 gxh4 3.Qxh4 Qd6
4.Rf7 Rg8 5.Re1 Ng6 6.Qh5 Be7 7.Bg7 Qc5+
8.Kh1 Kd8 9.Rd1 Kc7 10.Rxd5 (162.458.003) 431

6.01 11:18 +5.09 1.Be3 Qxb2 2.Raf1 Qxc3 3.Nxc6 Qxc6
4.Qf2 (286.071.619) 421

7.01 12:51 +5.60 1.Be3 (327.630.623) 424

8.01 31:00 +6.00 1.Be3 Nxd4 2.Bxd4 gxh4 3.Qg4 Qd6
4.Raf1 Kd8 5.Rxf8+ Rxf8 6.Rxf8+ Kc7
7.Rf7 Re8 8.Qxh4 Qxe6 9.Rf6 Qd7
10.Qf4+ Kc8 11.Bb6 Nc6 12.Rxh6 Re1+
13.Kf2 Re8 (781.039.116) 419

best move: Bc1-e3 time: 34:09.031 min n/s: 421.112 nodes: 862.860.111

[jdart]

Some multi-pv analysis from Arasan, 1 hr/move:

found 5-man tablebases in directory c:\chess\tb
bm Be3
result: Be3 score: +2.50 ++ solved in 867.35 sec. (2182.76M nodes
)
Be3 Qxb2 Rff1 Qxc3 Nxc6 bxc6 Qf2 Qg7 Bd4 Qg8 Bxh8 gxh4 Bc3 c5 Rae1 h3 g3 Rc6 Qf6
d4
result(2): Qf2 score: +1.65 ** not solved in 3600.13 secs. (
9062.18M nodes)
Qf2 Bg7 Nhf5 Nxf5 Rxf5 Bxd4
result(3): Nhf5 score: +1.12 ** not solved in 3600.09 secs. (
9270.07M nodes)
Nhf5 Nxf5 Rxf5 Nxd4 cxd4 Qxd4+ Be3 Qxe3+ Qxe3 Bc5 Qxc5 Rxc5 Rf7 Rf8 Rxb7 Rc2 Rf1
Rxf1+ Kxf1 Rc6 Rd7 Rc1+ Ke2 Rc2+ Kf3 Rxb2 Rxd5 Rxa2