Eelco de Groot wrote:Dann Corbit wrote:
More analysis coming...
I think I have a
new best move for
1r2r1k1/5pp1/R2p3n/3P1P1p/2p2PP1/1qb2B1P/Q7/2BR1K2 b - - bm Bd2; id "STS(v7.0) Simplification.009"; c0 "Bd2=10, Bb2=5, Bb4=5, hxg4=3";
Dann
But still running and I hope it gets to 27 plies because Rainbow Serpent only found the new move at 25.40, 25 plies deep, move 40 from 47 in the move-list. Interested to see if Rybka or Naum agrees with Stockfish or Rainbow Serpent.
Eelco
The new move is 1... Bb4! Chosen by Rainbow Serpent Build 008, it holds even after 29 plies. Build 007 would probably have switched to this move as well, and the evaluation is still all the same as in Stockfish but I did not let build 007 run long enough, I noticed it was pondering this move though after some 1200 minutes.
Not that it means a lot if the leaf-positions also are a draw but the move is likely to be at least as good as the other candidates. The score for the other moves, especially Bd2 in this case seemed to drop a bit faster in this build, it may be just a coincidence but I'm happy with it if it helps detecting a draw earlier or hopefully in this case a positionally bit better move.
If you let Rybka calculate longer I think the 1.11 score for Bd2 should drop and Jarkko's analysis should not be much different from that, the analysis he posted bears out that it is very close to Rybka's
I think -1.08 was from White's point of view.
-Rainbow Serpent compared to Stockfish 1.5.1: only very minor changes in search()
[D]1r2r1k1/5pp1/R2p3n/3P1P1p/2p2PP1/1qb2B1P/Q7/2BR1K2 b - -
Engine: Rainbow Serpent 1.5 Build 008 (Athlon 2009 MHz, 128 MB)
by Romstad, Costalba, Kiiski, De Groot
7.00 0:00 +0.76 1...hxg4 2.hxg4 Qxa2 3.Rxa2 Bb4
4.Kg2 c3 5.Ra7 (31.088) 105
7.00 0:00 +1.05++ 1...Bd4 2.Qxb3 Rxb3 3.Be2 Rxh3
4.Rxd4 Rh1+ (61.042) 177
8.00 0:00 +1.09 1...Bd4 2.Qxb3 Rxb3 3.Rxd4 Rxf3+
4.Kg2 hxg4 5.hxg4 Rc3 6.Bd2 Re2+
7.Kf1 (73.705) 196
9.00 0:00 +1.09 1...Bd4 2.Qxb3 Rxb3 3.Rxd4 Rxf3+
4.Kg2 hxg4 5.hxg4 Rc3 6.Bd2 Re2+
7.Kf1 (106.358) 243
10.00 0:00 +1.29++ 1...Bd4 2.Qxb3 Rxb3 3.Rxd4 Rxf3+
4.Kg2 Rc3 5.Bd2 Rb3 6.Rxd6 c3 (168.334) 308
11.00 0:00 +0.68 1...Bd4 2.Qxb3 Rxb3 3.Ra3 hxg4
4.hxg4 Rxa3 5.Bxa3 Re3 6.Kf2 Rd3+
7.Ke2 Rxa3 8.Rxd4 c3 (309.405) 404
11.11 0:01 +0.80 1...Bd2 2.Kg2 Qxa2 3.Rxa2 Bb4 4.Be2 c3
5.Rd3 hxg4 6.hxg4 Ba5 7.Rh3 (757.606) 505
12.01 0:02 +0.68 1...Bd2 2.Kg2 Qxa2 3.Rxa2 Bb4 4.Be2 c3
5.Rd3 hxg4 6.hxg4 Re4 7.Rh3 Ba5 (1.060.608) 526
12.21 0:04 +0.88 1...Ba5 2.Qxb3 Rxb3 3.Be2 Bb4 4.Rb6 Re4
5.Rb8+ Kh7 6.Rb5 Bc5 7.Rxb3 cxb3
8.Ke1 hxg4 9.hxg4 (2.284.959) 562
13.01 0:04 +0.92 1...Ba5 2.Qxb3 Rxb3 3.Be2 Bb4 4.Rb6 Re4
5.Rb8+ Kh7 6.Rb5 hxg4 7.hxg4 c3
8.Rb8 Rb1 (2.569.423) 569
14.01 0:06 +0.72-- 1...Ba5 2.Qxb3 Rxb3 3.Kg2 Bb4 4.Ra2 c3
5.Rc2 hxg4 6.hxg4 Bc5 7.Rd3 (3.924.099) 588
14.47 0:17 +0.84 1...Bd4 2.Ra3 Qb4 3.Qd2 Qxd2 4.Bxd2 Rb2
5.Re1 Kf8 6.Rxe8+ Kxe8 7.Ke1 Kd7
8.Be2 Bc5 9.Ra6 hxg4 10.hxg4 (10.324.306) 601
15.01 0:19 +0.64-- 1...Bd4 2.Ra3 Qb4 3.Qc2 hxg4 4.hxg4 Bc5
5.g5 (11.654.638) 602
16.01 0:42 +0.40 1...Bd4 2.Ra3 Qxa2 3.Rxa2 Rb3 4.Kg2 Bb6
5.Rc2 c3 6.Rd3 Rc8 7.Kg3 Rc4 8.Be3 Bc5
9.Bxc5 hxg4 10.hxg4 Rxc5 (25.907.569) 602
16.04 1:05 +0.72 1...Bd2 2.Qxb3 Rxb3 3.Ra3 Rxa3
4.Bxa3 hxg4 5.Bxg4 Nxg4 6.hxg4 c3
7.Bc1 Re4 8.Bxd2 cxd2 9.Rxd2 Rxf4+
10.Ke2 Rxg4 11.Ke3 Rg3+ 12.Kd4 Rb3 (40.144.065) 617
17.01 1:17 +0.88 1...Bd2 2.Qxb3 Rxb3 3.Ra3 Rxa3
4.Bxa3 hxg4 5.Bxg4 Nxg4 6.hxg4 c3
7.Bc1 Re4 8.Bxd2 cxd2 9.Rxd2 Rxf4+
10.Ke2 Rxg4 11.Ke3 Kf8 12.Re2 Ra4 (47.898.839) 617
18.01 1:39 +0.84 1...Bd2 2.Qxb3 Rxb3 3.Ra3 Rxa3
4.Bxa3 hxg4 5.Bxg4 Nxg4 6.hxg4 c3
7.Bc1 Re4 8.Bxd2 cxd2 9.Rxd2 Rxf4+
10.Ke2 Rxg4 11.Ke3 Kf8 12.Re2 Ra4
13.Rb2 (61.784.323) 619
19.01 2:12 +0.60-- 1...Bd2 2.Qxb3 Rxb3 3.Bxd2 Rxf3+
4.Kg2 hxg4 (80.915.369) 611
20.01 7:39 +0.64 1...Bd2 2.Qxb3 Rxb3 3.Ra3 Rxa3
4.Bxa3 Bxf4 5.Rd4 Bh2 6.Rxc4 Re3
7.Bb4 Rxf3+ 8.Kg2 Rf4 9.Rc8+ Kh7
10.Bxd6 Rxf5 11.Bxh2 Rxd5 12.gxh5 Rd2+
13.Kg3 Nf5+ 14.Kf4 Rxh2 (281.771.650) 612
21.01 11:22 +0.64 1...Bd2 2.Qxb3 Rxb3 3.Ra3 Rxa3
4.Bxa3 Bxf4 5.Rd4 Bh2 6.Rxc4 Re3
7.Bb4 Rxf3+ 8.Kg2 Rf4 9.Rc8+ Kh7
10.Bxd6 Rxf5 11.Bxh2 Rxd5 12.gxh5 Rd2+
13.Kg3 Nf5+ 14.Kf4 Rxh2 (415.536.330) 609
22.01 16:50 +0.64 1...Bd2 2.Qxb3 Rxb3 3.Ra3 Rxa3
4.Bxa3 Bxf4 5.Rd4 Bh2 6.Rxc4 Re3
7.Bb4 Rxf3+ 8.Kg2 Rf4 9.Rc8+ Kh7
10.Bxd6 Rxf5 11.Bxh2 Rxd5 12.gxh5 Rd2+
13.Kg1 Nf5 14.Bf4 Re2 (613.837.441) 607
23.01 33:07 +0.84++ 1...Bd2 (1.229.095.560) 618
24.01 39:34 +0.52 1...Bd2 2.Qxb3 Rxb3 3.Ra3 Bxc1
4.Rxb3 cxb3 5.Rxc1 Rb8 6.Kf2 b2
7.Rb1 Rb3 8.Ke2 Kf8 9.f6 hxg4
10.fxg7+ Kxg7 11.hxg4 f6 12.Be4 Nxg4
13.Bd3 Nh2 14.Bc2 Rb4 (1.490.693.346) 627
25.01 156:25 +0.40 {Falling to drawlevels} 1...Bd2 2.Qxb3 Rxb3 3.Ra3 Bxc1
4.Rxb3 cxb3 5.Rxc1 Rb8 6.Kf2 b2
7.Rb1 Rb3 8.f6 hxg4 9.hxg4 gxf6
10.f5 Kf8 11.Be2 Kg7 12.Ke1 Rb4
13.Kd2 Ra4 14.Rxb2 Nxg4 (5.711.537.103) 608
25.40 512:52 +0.72 1...Bb4 2.Kg2 Bc5 3.Qxb3 cxb3 4.Bd2 Ra8
5.Rxa8 Rxa8 6.Kg3 Ra2 7.Be2 b2 8.Rb1 Ra3+
9.Bf3 Rb3 10.f6 hxg4 11.hxg4 Bd4
12.f5 Bxf6 13.Bf4 Be5 14.Bxe5 dxe5 (18.742.922.836) 609
26.01 552:51 +0.72 1...Bb4 2.Kg2 Bc5 3.Qxb3 cxb3 4.Bd2 Ra8
5.Rxa8 Rxa8 6.Kg3 Ra2 7.Be4 hxg4
8.hxg4 b2 9.Rb1 Ra3+ 10.Bf3 Rb3
11.f6 Bd4 12.fxg7 Kxg7 13.Be1 f6
14.Bd2 Bc5 (20.181.834.944) 608
27.01 770:25 +0.64 1...Bb4 2.Kg2 Bc5 3.Qxb3 cxb3 4.Bd2 Ra8
5.Rxa8 Rxa8 6.Kg3 Ra3 7.Be1 b2 8.Rb1 Ra1
9.Be4 hxg4 10.hxg4 Ra3+ 11.Bf3 Ra1
12.Be4 Kf8 13.Bc2 Ra3+ 14.Kh4 Bd4 (28.030.994.772) 606
28.01 1459:35+0.64 1...Bb4 2.Kg2 Bc5 3.Qxb3 cxb3 4.Bd2 Ra8
5.Rxa8 Rxa8 6.Kg3 Ra3 7.Be1 b2 8.Rb1 Ra1
9.Be4 hxg4 10.hxg4 f6 11.Bd2 Ra3+
12.Kg2 Nxg4 13.Rxb2 Ne3+ 14.Kh2 Kh7 (53.398.268.102) 609
29.01 2321:41+0.64 1...Bb4 2.Kg2 Bc5 3.Qxb3 cxb3 4.Bd2 Ra8
5.Rxa8 Rxa8 6.Kg3 f6 7.Rb1 Ra3 8.Be4 hxg4
9.hxg4 b2+ 10.Kg2 Nxg4 11.Rxb2 Ne3+
12.Kh2 Kh7 13.Bc1 Ra4 14.Bd3 Nxd5 (84.605.297.003) 607
best move: Bc3-b4 time: 2465:12.500 min n/s: 609.533 nodes: 90.157.590.229
Eelco