STS (v7.0) - "Offer of Simplification"

Eelco de Groot · Post by **Eelco de Groot** » Sun Nov 08, 2009 11:54 am

Dann Corbit wrote: This is some interesting analysis, and I will look into it. Since the key idea remains valid (offer of simplification) it may be an excellent alternative. The score also seems similar to the value I have stored for the key move.

Thanks Dann and Swami! I would be interested in the results also for my own testing of the Rainbow Serpent

I hope the result can be verified. I ran the position again with build No. 5 which finds Bd2 a bit later and Bb2 earlier. It keeps this, all through 28 plies deep. Bd2 however seems to drop from the first choices to somewhere halfway on the movelist, but this is not very accurate information about what the actual evaluation is, the null window search may just take relatively little nodes because the moves are well ordered.

1r2r1k1/5pp1/R2p3n/3P1P1p/2p2PP1/1qb2B1P/Q7/2BR1K2 b - -

Engine: Rainbow Serpent 1.5 Build 005 (Athlon 2009 MHz, 128 MB)
by Romstad, Costalba, Kiiski, De Groot

7.01 0:08 +0.76 1...hxg4 2.hxg4 Qxa2 3.Rxa2 Bb4
4.Kg2 c3 5.Ra7 (31.483) 3

7.38 0:08 +1.05++ 1...Bd4 2.Qxb3 Rxb3 3.Be2 Rxh3
4.Rxd4 Rh1+ (62.255) 7

8.01 0:08 +1.09 1...Bd4 2.Qxb3 Rxb3 3.Rxd4 Rxf3+
4.Kg2 hxg4 5.hxg4 Rc3 6.Bd2 Re2+
7.Kf1 (75.174) 8

9.01 0:08 +1.09 1...Bd4 2.Qxb3 Rxb3 3.Rxd4 Rxf3+
4.Kg2 hxg4 5.hxg4 Rc3 6.Bd2 Re2+
7.Kf1 (110.148) 12

10.01 0:08 +1.29++ 1...Bd4 2.Qxb3 Rxb3 3.Rxd4 Rxf3+
4.Kg2 Rc3 5.Bd2 Rb3 6.Rxd6 c3 (179.605) 20

11.01 0:08 +0.88 1...Bd4 2.Qxb3 Rxb3 3.Ra3 Rxa3
4.Bxa3 Re3 5.Kf2 Bb6 6.Bc1 Re8+
7.Kg3 c3 8.Ba3 hxg4 9.hxg4 (350.889) 39

12.01 0:10 +0.92 1...Bd4 2.Ra3 Qb4 3.Qd2 Qxd2 4.Bxd2 Rb2
5.Be1 Re3 6.Ra8+ Kh7 7.Bg2 Rbe2
8.Bf3 (1.112.320) 108

13.01 0:13 +0.72 1...Bd4 2.Ra3 Qb4 3.Qd2 Bc5 4.Qxb4 Bxb4
5.Re3 Kf8 6.Rd4 Rxe3 7.Bxe3 Bc5
8.Re4 Bxe3 9.Rxe3 hxg4 10.hxg4 (2.731.296) 207

13.02 0:13 +0.88 1...Ba5 2.Qxb3 Rxb3 3.Be2 Bb4 4.Rb6 Re4
5.Rb8+ Kh7 6.Rb6 hxg4 7.hxg4 Bc5
8.Rxb3 cxb3 9.Ke1 (3.036.814) 222

14.01 0:18 +0.72 1...Ba5 2.Qxb3 Rxb3 3.Kg2 Bb4 4.Ra2 c3
5.Rc2 Ba5 6.Rd3 hxg4 7.hxg4 Kf8
8.Kg3 Rb1 (5.998.104) 320

15.01 0:33 +0.56 1...Ba5 2.Qxb3 Rxb3 3.Kg2 Bb4 4.Ra2 c3
5.Rc2 Kf8 6.Kg3 Ng8 7.Rd3 hxg4
8.hxg4 Nf6 9.Re3 (14.548.790) 431

16.01 1:22 +0.44 1...Ba5 2.Qxb3 Rxb3 3.Kg2 Bb4 4.Ra2 c3
5.Rc2 Ba5 6.Rd3 f6 7.Kg3 Kf7 8.Be3 hxg4
9.hxg4 Rb2 (42.423.017) 511

17.01 3:11 +0.44 1...Ba5 2.Qxb3 Rxb3 3.Kg2 Bb4 4.Ra2 c3
5.Rc2 Kf8 6.Be2 Re7 7.Kf3 Ba5 8.Rh1 Kg8
9.Bc4 Rb1 10.Rd1 (104.006.093) 542

17.03 3:34 +0.56 1...Bd2 2.Kg2 Re3 3.Qxd2 Rxf3 4.Ra3 Rd3
5.Rxb3 Rxd2+ 6.Rxd2 Rxb3 7.Rc2 hxg4
8.hxg4 Nxg4 9.Rxc4 Nf6 10.Rc8+ Kh7
11.Rc7 Nxd5 12.Rxf7 (117.196.278) 547

18.01 5:19 +0.64 1...Bd2 2.Kg2 Re3 3.Qxd2 Rxf3 4.Ra3 Rd3
5.Rxb3 Rxd2+ 6.Rxd2 Rxb3 7.Rc2 hxg4
8.hxg4 Nxg4 9.Rxc4 Kf8 10.Rc7 Nf6
11.Rc8+ Ke7 12.Rc7+ Nd7 (177.666.894) 555

19.01 6:53 +0.68 1...Bd2 2.Kg2 Re3 3.Qxd2 Rxf3 4.Ra3 Rd3
5.Rxb3 Rxd2+ 6.Rxd2 Rxb3 7.Rc2 hxg4
8.hxg4 Nxg4 9.Rxc4 Kf8 10.Rc7 Nf6
11.Rc8+ Ke7 12.Rc7+ Ke8 13.Rc8+ Kd7 (234.665.740) 566

20.01 9:23 +0.88++ 1...Bd2 (325.041.997) 576

21.01 12:54 +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 (463.649.063) 598

21.14 23:15 +1.21 1...Bb2 2.Qxb3 Rxb3 3.Kf2 Bxc1
4.Rxc1 Rb2+ 5.Kg3 Re3 6.Ra8+ Kh7
7.Rf1 c3 8.Raa1 c2 9.Rac1 Rc3 10.Rf2 Ng8
11.Kg2 hxg4 12.hxg4 Nf6 13.g5 Nd7
14.Kg3 (829.960.747) 594

22.01 27:42 +0.92 1...Bb2 2.Qxb3 Rxb3 3.Kf2 Bxc1
4.Rxc1 Rb2+ 5.Kg3 Re3 6.Rf1 c3
7.Ra8+ Kh7 8.Raa1 Rd2 9.Rae1 Red3
10.Rf2 hxg4 11.hxg4 Nxg4 12.Rxd2 cxd2
13.Rh1+ Nh6 14.Kf2 Kg8 (997.410.657) 600

23.01 42:11 +0.92 1...Bb2 2.Qxb3 Rxb3 3.Kf2 Bxc1
4.Rxc1 Rb2+ 5.Kg3 Re3 6.Rf1 c3
7.Ra8+ Kh7 8.Raa1 Rd2 9.Rae1 Red3
10.Rf2 hxg4 11.hxg4 Nxg4 12.Rxd2 cxd2
13.Rh1+ Nh6 14.Kf2 Kg8 (1.518.801.236) 599

24.01 72:02 +1.09 1...Bb2 2.Qxb3 Rxb3 3.Kf2 Bxc1
4.Rxc1 Rb2+ 5.Kg3 Re3 6.Rf1 c3 7.Rc6 h4+
8.Kxh4 c2 9.Rc8+ Kh7 10.Bh1 f6
11.Rc1 Rb4 12.Rf1 Rb1 13.Bg2 Rxf1
14.Bxf1 Re1 (2.580.742.809) 596

25.01 114:02 +1.05 1...Bb2 2.Qxb3 Rxb3 3.Kf2 Bxc1
4.Rxc1 Rb2+ 5.Kg3 Re3 6.Rf1 c3 7.Rc6 h4+
8.Kxh4 c2 9.Rc8+ Kh7 10.Bh1 f6
11.Rc1 Rb4 12.Rf1 Rb1 13.Bg2 Rxf1
14.Bxf1 Re1 (4.138.059.926) 604

26.01 212:33 +1.17 1...Bb2 2.Qxb3 Rxb3 3.Kf2 Bxc1
4.Rxc1 Rb2+ 5.Kg3 Re3 6.Rf1 c3 7.Ra4 c2
8.Ra8+ Kh7 9.Raa1 Ng8 10.Rac1 Nf6
11.Kf2 Rd3 12.Ke2 Rbb3 13.g5 Nxd5
14.Bxd5 Rxd5 (7.739.760.203) 606

27.01 369:44 +1.13 1...Bb2 2.Qxb3 Rxb3 3.Kf2 Bxc1
4.Rxc1 Rb2+ 5.Kg3 Re3 6.Rf1 c3 7.Ra4 c2
8.Ra8+ Kh7 9.Raa1 Ng8 10.Rac1 Nf6
11.Kf2 Rd3 12.Ke2 Rbb3 13.g5 Nxd5
14.Bxd5 Rxd5 (13.577.863.639) 612

28.01 634:28 +0.92-- 1...Bb2 2.Qxb3 (23.299.711.769) 612

best move: Bc3-b2 time: 2088:39.421 min n/s: 600.242 nodes: 75.221.880.347

I had no patience to wait for iteration 29, it might have taken several hours more for the first result of Bb2 at that depth.

Eelco de Groot · Post by **Eelco de Groot** » Mon Nov 09, 2009 4:12 pm

[D]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";

To help Dann a bit

two more tries at the position, for a while I thought the results were badly influenced because Rainbow Serpent was up to now basically Stockfish 1.5, and I had not yet updated to the 1.5.1 sources which are more different than I thought

I had forgotten there were some problems with the first 1.5 version.

But it now seems that it does not make a great deal of diference here except the 1.5.1 version chooses Bd2 and not Bb2. The two moves seem both to lead to a draw though so in the end the choice is moot. The eval after Bb2 with the latest Stockfish 1.5.1 based Rainbow Serpent is very close to that after Bd2.

Result with Stockfish 1.5

1r2r1k1/5pp1/R2p3n/3P1P1p/2p2PP1/1qb2B1P/Q7/2BR1K2 b - -

Engine: Stockfish 1.5 JA (128 MB)
by Tord Romstad, Marco Costalba, Joona Kiiski

1.00 0:00 +1.33 1...Qb4 (1.479) 4

2.00 0:00 +0.92 1...Qb4 2.Kg2 hxg4 3.hxg4 (1.596) 4

2.00 0:00 +1.21 1...hxg4 2.Qxb3 cxb3 3.hxg4 (1.655) 5

3.00 0:00 +1.21 1...hxg4 2.Qxb3 cxb3 3.hxg4 (2.224) 6

4.00 0:00 +0.92 1...hxg4 2.hxg4 Qb4 3.Kg2 (4.207) 12

4.00 0:00 +0.96 1...Qb5 2.Kg2 hxg4 3.hxg4 (6.638) 20

5.00 0:00 -0.32 1...Qb5 2.Rc6 hxg4 3.hxg4 Rbc8
4.Rxd6 (8.879) 25

5.00 0:00 +0.88 1...hxg4 2.hxg4 Bd4 3.Qxb3 Rxb3
4.Rxd4 Rxf3+ 5.Kg2 (11.435) 33

6.00 0:00 +0.84 1...hxg4 2.hxg4 Be1 3.Qa3 Bg3 4.Qxb3 Rxb3 (17.492) 48

7.00 0:00 +0.76 1...hxg4 2.hxg4 Qxa2 3.Rxa2 Bb4
4.Kg2 c3 5.Ra7 (30.070) 80

7.00 0:00 +1.05++ 1...Qxa2 2.Rxa2 Bb4 3.Kf2 hxg4
4.hxg4 Bc5+ 5.Kg3 c3 (34.505) 92

8.00 0:00 +0.72 1...Qxa2 2.Rxa2 Bb4 3.Bd2 Bxd2
4.Rdxd2 c3 5.Rdc2 hxg4 6.hxg4 Rb1+
7.Kf2 (54.200) 133

8.00 0:00 +0.76 1...Bf6 2.Qxb3 cxb3 3.Ba3 b2 4.Rb1 hxg4
5.hxg4 Rb3 6.Be2 (76.973) 175

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 (143.152) 269

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 (155.610) 284

10.00 0:00 +1.29++ 1...Bd4 2.Qxb3 Rxb3 3.Rxd4 Rxf3+
4.Kg2 Rc3 5.Bd2 Rb3 6.Rxd6 c3 (213.668) 341

11.00 0:00 +0.88 1...Bd4 2.Qxb3 Rxb3 3.Ra3 Rxa3
4.Bxa3 Re3 5.Kf2 Bb6 6.Bc1 Re8+
7.Kg3 c3 8.Ba3 hxg4 9.hxg4 (418.698) 478

11.11 0:01 +1.05 1...Ba5 2.Qxb3 Rxb3 3.Kg2 Bb4 4.Rh1 c3
5.f6 gxf6 6.g5 fxg5 7.fxg5 (775.556) 584

12.01 0:01 +1.05 1...Ba5 2.Qxb3 Rxb3 3.Kg2 Bb4 4.Rh1 c3
5.f6 gxf6 6.g5 Nf5 7.Bxh5 Bc5 (998.654) 620

13.01 0:02 +0.96 1...Ba5 2.Qxb3 Rxb3 3.Kg2 Bb4 4.Rf1 Bc5
5.f6 hxg4 6.hxg4 gxf6 7.Rh1 Kg7
8.Bd2 (1.808.300) 684

14.01 0:04 +0.76-- 1...Ba5 2.Qxb3 Rxb3 3.Kg2 Bb4 4.Ra2 c3
5.Rc2 Bc5 6.Rd3 (3.432.678) 734

15.01 0:15 +0.60 1...Ba5 2.Qxb3 Rxb3 3.Kg2 Bb4 4.Ra2 c3
5.Rc2 hxg4 6.hxg4 Ba5 7.Kg3 Kf8
8.Rh1 Bb6 9.f6 (11.841.706) 774

16.01 0:42 +0.48 1...Ba5 2.Qxb3 Rxb3 3.Kg2 Bb4 4.Ra2 c3
5.Rc2 Kf8 6.Rd3 hxg4 7.hxg4 Ng8
8.Re3 Nf6 9.Rxe8+ Kxe8 10.g5 Nd7 (32.541.185) 768

16.06 1:13 +0.60 1...Bd2 2.Kg2 Bxc1 3.Qxb3 Rxb3
4.Rxc1 Ree3 5.Rf1 c3 6.Rxd6 c2
7.Rd8+ Kh7 8.Rc8 Rb1 9.g5 Nxf5
10.Bxh5 g6 11.Rxc2 Rxf1 12.Kxf1 gxh5 (56.626.509) 772

17.01 1:46 +0.80++ 1...Bd2 (82.283.870) 769

18.01 2:36 +0.36 1...Bd2 2.Qxb3 Rxb3 3.Ra3 Rxa3
4.Bxa3 Bxf4 5.Rd4 Bh2 6.Rxc4 Re3
7.Bb4 Rxf3+ 8.Kg2 hxg4 9.hxg4 Rf4
10.Rc8+ Kh7 11.Bxd6 Nxg4 12.Bxf4 Bxf4
13.Kf3 (123.138.145) 789

18.03 3:47 +0.44 1...Bf6 2.Kg2 Qc3 3.Qd2 Rb3 4.Qxc3 Rxc3
5.Ra2 Rb8 6.Bd2 Rcb3 7.Bc1 Bh4 8.Ra6 R3b6
9.Rxb6 Rxb6 10.Bd2 Rb2 11.g5 Nxf5
12.Bxh5 (177.260.786) 778

18.19 7:12 +1.21 1...Bb2 2.Qxb3 Rxb3 3.Kf2 Bxc1
4.Rxc1 Rb2+ 5.Kg3 Re3 6.Rf1 c3 7.Rc6 Kh7
8.Rc7 hxg4 9.hxg4 Rd2 10.Rc8 Rxd5
11.Rc1 Rdd3 (332.605.351) 769

19.01 7:44 +1.21 1...Bb2 2.Qxb3 Rxb3 3.Kf2 Bxc1
4.Rxc1 Rb2+ 5.Kg3 Re3 6.Rf1 c3 7.Rf2 hxg4
8.hxg4 Nxg4 9.Rxb2 cxb2 10.Rb6 Nh2
11.Kxh2 Rxf3 12.Rxb2 Rxf4 13.Rb8+ Kh7
14.Rb6 Rxf5 (358.554.479) 772

20.01 9:29 +1.21 1...Bb2 2.Qxb3 Rxb3 3.Kf2 Bxc1
4.Rxc1 Rb2+ 5.Kg3 Re3 6.Rf1 c3 7.Rf2 hxg4
8.hxg4 Nxg4 9.Rxb2 cxb2 10.Rb6 Nh2
11.Kxh2 Rxf3 12.Rxb2 Rxf4 13.Rb8+ Kh7
14.Rb6 Rxf5 (441.106.194) 775

21.01 13:11 +1.01-- 1...Bb2 2.Qxb3 (619.153.855) 782

22.01 25:09 +1.01 1...Bb2 2.Qxb3 Rxb3 3.Kf2 Bxc1
4.Rxc1 Rb2+ 5.Kg3 Re3 6.Rf1 c3 7.Rc6 Kh7
8.Rf2 hxg4 9.hxg4 Nxg4 10.Rxc3 Rxf2
11.Rxe3 Nxe3 12.Kxf2 Nxf5 13.Bh5 g6
14.Be2 Kg7 (1.186.180.989) 786

23.01 51:07 +1.05 1...Bb2 2.Qxb3 Rxb3 3.Kf2 Bxc1
4.Rxc1 Rb2+ 5.Kg3 Re3 6.Rf1 c3 7.Rc6 h4+
8.Kxh4 c2 9.Rc8+ Kh7 10.Bh1 Rb1
11.Bg2 Rxf1 12.Bxf1 Re1 13.Rxc2 Rxf1
14.Rc6 Rxf4 (2.432.921.732) 793

24.01 96:28 +0.92 1...Bb2 2.Qxb3 Rxb3 3.Kf2 Bxc1
4.Rxc1 Rb2+ 5.Kg3 Re3 6.Rf1 c3 7.Rc6 h4+
8.Kxh4 c2 9.Rc4 Rb1 10.Rc8+ Kh7
11.Bg2 Rxf1 12.Bxf1 Re1 13.Rxc2 Rxf1
14.Rc6 f6 (4.634.563.160) 800

25.01 260:54 +0.64-- 1...Bb2 2.Qxb3 (12.586.112.536) 804

best move: Bc3-b2 time: 423:44.094 min n/s: 789.903 nodes: 20.082.540.274

And with Rainbow Serpent Build 006 now based on Stockfish 1.5.1:

1r2r1k1/5pp1/R2p3n/3P1P1p/2p2PP1/1qb2B1P/Q7/2BR1K2 b - -

Engine: Rainbow Serpent 1.5 Build 006 (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 (31.504) 118

7.00 0:00 +1.05++ 1...Bd4 2.Qxb3 Rxb3 3.Be2 Rxh3
4.Rxd4 Rh1+ (62.278) 189

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 (75.205) 218

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 (110.185) 271

10.00 0:00 +1.29++ 1...Bd4 2.Qxb3 Rxb3 3.Rxd4 Rxf3+
4.Kg2 Rc3 5.Bd2 Rb3 6.Rxd6 c3 (177.152) 343

11.00 0:00 +0.88 1...Bd4 2.Qxb3 Rxb3 3.Ra3 Rxa3
4.Bxa3 Re3 5.Kf2 Bb6 6.Bc1 Re8+
7.Kg3 c3 8.Ba3 hxg4 9.hxg4 (321.301) 437

12.01 0:01 +0.80 1...Bd4 2.Ra3 Qb4 3.Qd2 Bc5 4.Qxb4 Bxb4
5.Ra4 c3 6.Re1 Bc5 7.Rxe8+ Rxe8
8.Be2 hxg4 9.hxg4 (897.361) 531

13.01 0:04 +0.32 1...Bd4 2.Ra3 Qxa2 3.Rxa2 hxg4
4.hxg4 Bc5 5.Re1 Kf8 6.Rxe8+ Kxe8
7.Ke2 Kd7 8.Bb2 f6 (2.792.846) 587

13.02 0:05 +0.88 1...Ba5 2.Qxb3 Rxb3 3.Be2 Bb4 4.Rb6 Re4
5.Rb8+ Kh7 6.Rb7 Bc5 7.Rxb3 cxb3
8.Ke1 hxg4 9.hxg4 (3.044.806) 594

14.01 0:09 +0.92 1...Ba5 2.Qxb3 Rxb3 3.Kg2 Bb6 4.Ra4 c3
5.Rd3 hxg4 6.hxg4 Rc8 7.Rd1 Rb8
8.Re1 Bc5 (6.093.129) 612

15.01 0:15 +0.72-- 1...Ba5 2.Qxb3 Rxb3 3.Kg2 Bb6 4.Ra3 hxg4
5.hxg4 Bc5 6.Rxb3 cxb3 7.Kg3 Kh7
8.Kg2 (9.597.277) 619

16.01 0:43 +0.48 1...Ba5 2.Qxb3 Rxb3 3.Kg2 Bb4 4.Ra4 Rc8
5.Ra2 Bc5 6.Re1 c3 7.Bd1 Rb4 8.Kf3 Rd4
9.Bc2 hxg4+ 10.hxg4 Rxd5 (26.864.263) 624

16.02 0:46 +0.72 1...Bd2 2.Kg2 Bxc1 3.Qxb3 Rxb3
4.Rxc1 Ree3 5.Rf1 c3 6.Rc6 Kh7 7.Kg3 Rb2
8.Rf2 hxg4 9.hxg4 Nxg4 10.Rxc3 Rxf2
11.Rxe3 Nxe3 12.Kxf2 Nxf5 (29.256.484) 626

17.01 1:09 +0.72 1...Bd2 2.Kg2 Bxc1 3.Qxb3 Rxb3
4.Rxc1 Ree3 5.Rf1 c3 6.Rc6 Kh7 7.Kg3 Rb2
8.Rf2 hxg4 9.hxg4 Nxg4 10.Rxc3 Rxf2
11.Rxe3 Nxe3 12.Kxf2 Nxf5 (43.323.615) 622

18.01 1:55 +0.52-- 1...Bd2 2.Kg2 (71.872.006) 621

19.01 5:20 +1.21 1...Bd2 2.Kg2 Bxc1 3.Qxb3 Rxb3
4.Rxc1 Rb2+ 5.Kg3 Re3 6.Rf1 c3 7.Rc6 Kh7
8.Rf2 Ng8 9.Rxc3 h4+ 10.Kxh4 Rxc3
11.Rxb2 Rxf3 12.Rb6 Nf6 13.Rxd6 Rxf4 (196.890.085) 615

20.01 6:35 +1.05 1...Bd2 2.Kg2 Bxc1 3.Qxb3 Rxb3
4.Rxc1 Rb2+ 5.Kg3 Re3 6.Rf1 c3 7.Rc6 Kh7
8.Rf2 hxg4 9.hxg4 Nxg4 10.Rxc3 Rxf2
11.Rxe3 Nxe3 12.Kxf2 Nxf5 13.Be4 Kg6 (243.332.323) 615

21.01 10:44 +1.09 1...Bd2 2.Kg2 Bxc1 3.Qxb3 Rxb3
4.Rxc1 Rb2+ 5.Kg3 Re3 6.Rf1 c3 7.Rc6 Rd2
8.Rf2 Rxd5 9.Re2 Rxe2 10.Bxe2 hxg4
11.Rc8+ Kh7 12.hxg4 Rc5 13.Rxc5 dxc5
14.Bd3 Ng8 (400.494.777) 620

22.01 15:48 +1.01 1...Bd2 2.Kg2 Bxc1 3.Qxb3 Rxb3
4.Rxc1 Rb2+ 5.Kg3 Re3 6.Rf1 c3 7.Rc6 Rd2
8.Rf2 Rxd5 9.Re2 Rxe2 10.Bxe2 Rc5
11.Rxc5 dxc5 12.Bd3 hxg4 13.hxg4 Kf8
14.Bc2 Ke7 (590.810.362) 622

23.01 28:20 +1.01 1...Bd2 2.Kg2 Bxc1 3.Qxb3 Rxb3
4.Rxc1 Rb2+ 5.Kg3 Re3 6.Rf1 c3 7.Rc6 Rd2
8.Rf2 Rxd5 9.Re2 Rxe2 10.Bxe2 Rc5
11.Rxc5 dxc5 12.Bd3 hxg4 13.hxg4 Kf8
14.g5 Ng8 (1.051.734.344) 618

24.01 46:37 +0.80-- 1...Bd2 2.Kg2 (1.722.332.591) 615

25.01 116:43 +0.84 1...Bd2 2.Kg2 Bxc1 3.Qxb3 Rxb3
4.Rxc1 Rb2+ 5.Kg3 Re3 6.Rf1 c3 7.Rc6 Kh7
8.Rf2 hxg4 9.hxg4 Nxg4 10.Rxc3 Rxf2
11.Rxe3 Nxe3 12.Kxf2 Nxf5 13.Bh5 g6
14.Bg4 Ne7 (4.297.474.609) 613

26.01 191:25 +0.84 1...Bd2 2.Kg2 Bxc1 3.Qxb3 Rxb3
4.Rxc1 Rb2+ 5.Kg3 Re3 6.Rf1 c3 7.Rc6 Kh7
8.Rf2 hxg4 9.hxg4 Nxg4 10.Rxc3 Rxf2
11.Rxe3 Nxe3 12.Kxf2 Nxf5 13.Bh5 g6
14.Bg4 Ne7 (7.065.706.898) 615

27.01 408:33 +0.60-- 1...Bd2 2.Qxb3 Rxb3 3.Kg2 hxg4
4.hxg4 Ree3 5.Rxd2 (15.359.022.445) 626

best move: Bc3-d2 time: 1229:35.000 min n/s: 414.993 nodes: 30.616.140.267

And running in parallel the position after 1... Bb2, the score fluctuates but in the end is very similar to that for 1... Bd2.

Bb2 gets -0.56 from White's point of view, compared to +0.60-- for Bd2, Black point of view.

[D]1r2r1k1/5pp1/R2p3n/3P1P1p/2p2PP1/1q3B1P/Qb6/2BR1K2 w - -

Engine: Rainbow Serpent 1.5 Build 006 (Athlon 2009 MHz, 128 MB)
by Romstad, Costalba, Kiiski, De Groot

7.00 0:00 -0.12++ 2.Qxb3 Rxb3 3.Kf2 Bxc1 4.Rxc1 Rb2+
5.Kg3 hxg4 6.hxg4 (29.513) 48

8.00 0:00 -0.12 2.Qxb3 Rxb3 3.Kf2 hxg4 4.hxg4 Rd8
5.Bxb2 Rxb2+ 6.Ke3 Re8+ 7.Kd4 (56.312) 81

9.00 0:00 -0.04 2.Qxb3 Rxb3 3.Kf2 Rd8 4.Be3 c3 5.Rc6 Re8
6.Re1 hxg4 7.hxg4 (114.214) 130

10.00 0:01 -0.04 2.Qxb3 Rxb3 3.Kf2 Rd8 4.Rc6 c3 5.Be3 Re8
6.Re1 hxg4 7.hxg4 (219.909) 178

11.01 0:01 +0.04 2.Qxb3 Rxb3 3.Kf2 Rd8 4.Rc6 c3 5.Be3 Re8
6.Re1 hxg4 7.hxg4 Ba3 (379.539) 224

12.01 0:02 +0.24++ 2.Qxb3 Rxb3 3.Kf2 Rd8 4.Rc6 c3 5.Re1 Bxc1
6.Rxc1 hxg4 7.hxg4 Rb2+ 8.Kf1 (777.910) 264

13.01 0:05 +0.24 2.Qxb3 Rxb3 3.Kf2 Bxc1 4.Rxc1 Ree3
5.Bd1 Rxh3 6.Bxb3 cxb3 7.gxh5 Nxf5
8.Ke2 Rxh5 9.Kd2 Rh2+ 10.Kc3 (1.675.122) 298

14.01 0:09 -0.44 2.Qxb3 Rxb3 3.Kf2 Bxc1 4.Rxc1 Rb2+
5.Kg3 Re3 6.Rxd6 h4+ 7.Kxh4 Rxf3
8.Rxc4 Rbb3 9.Kg5 Rxh3 10.Rd8+ Kh7
11.f6 gxf6+ 12.Kxf6 Nxg4+ 13.Kxf7 Ne3 (2.890.549) 314

15.01 0:15 -0.36 2.Qxb3 Rxb3 3.Kf2 Bxc1 4.Rxc1 Rb2+
5.Kg3 Re3 6.Rxd6 h4+ 7.Kxh4 Rxf3
8.Rxc4 Rbb3 9.Kg5 Rxh3 10.f6 Rb8
11.fxg7 Kxg7 12.Ra6 (5.055.773) 326

16.01 0:20 -1.21-- 2.Qxb3 Rxb3 3.Kg1 Bxc1 (6.731.285) 331

17.01 1:07 -1.09 2.Qxb3 Rxb3 3.Kf2 Bxc1 4.Rxc1 Rb2+
5.Kg3 Re3 6.Rf1 c3 7.Rc6 Kh7 8.f6 gxf6
9.f5 h4+ 10.Kf4 Re8 11.Be4 Re2
12.Bd3 (22.385.561) 333

18.01 1:35 -0.96 2.Qxb3 Rxb3 3.Kf2 Bxc1 4.Rxc1 Rb2+
5.Kg3 Re3 6.Rf1 c3 7.Rc6 Kh7 8.f6 gxf6
9.f5 c2 10.Rf2 Nxg4 11.hxg4 hxg4
12.Rfxc2 Rxc2 13.Rxc2 gxf3 14.Kf2 (31.979.271) 334

19.01 2:34 -1.01 2.Qxb3 Rxb3 3.Kf2 Bxc1 4.Rxc1 Rb2+
5.Kg3 Re3 6.Rf1 c3 7.Rc6 Rd2 8.Rf2 Rxd5
9.Re2 Rxe2 10.Bxe2 Rc5 11.Rxc5 dxc5
12.Bd3 Kf8 13.gxh5 Ke7 14.Kf3 (51.723.404) 334

20.01 4:34 -0.92 2.Qxb3 Rxb3 3.Kf2 Bxc1 4.Rxc1 Rb2+
5.Kg3 Re3 6.Rf1 c3 7.Rc6 Rd2 8.f6 g6
9.Rc7 Kh7 10.Re7 Red3 11.Rc7 c2
12.Rf2 hxg4 13.hxg4 Rxf2 14.Kxf2 (91.532.327) 333

21.01 6:17 -1.13-- 2.Qxb3 Rxb3 3.Be3 Rexe3 (125.656.813) 332

22.01 32:07 -0.24++ 2.Qxb3 (632.016.305) 327

23.01 53:53 -0.28 2.Qxb3 Rxb3 3.Kf2 Bxc1 4.Rxc1 Rb2+
5.Kg3 Re3 6.Rxc4 Kh7 7.Rc8 Rbb3
8.Raa8 Rxf3+ 9.Kg2 Rg3+ 10.Kf2 Nxf5
11.gxf5 Rgf3+ 12.Kg1 g6 13.f6 Rg3+
14.Kf2 g5 15.fxg5 (1.054.466.158) 326

24.01 253:44 -0.60 2.Qxb3 Rxb3 3.Kg2 c3 4.Ra2 Kh7 5.Rg1 Rb4
6.Kg3 Ng8 7.Kg2 Ne7 8.Kf2 Rc8 9.f6 Bxc1
10.Rxc1 Ng6 11.Rac2 Rbc4 12.Ke3 Kg8
13.fxg7 Nxf4 14.Be4 Re8 15.Kxf4 (5.022.910.754) 329

25.01 364:48 -0.68 2.Qxb3 Rxb3 3.Kg2 c3 4.Ra2 Kh7 5.Rg1 Rb4
6.Kg3 Ng8 7.Kg2 Rd4 8.g5 h4 9.Kf2 Rd3
10.Bh5 g6 11.fxg6+ fxg6 12.Bf3 Ne7
13.Be2 Rd4 14.Bxb2 Rxf4+ 15.Kg2 (7.210.883.183) 329

26.01 687:26 -0.56 2.Qxb3 Rxb3 3.Kg2 c3 4.Rc6 Ra3
5.Bxb2 cxb2 6.Rb1 Rb8 7.Rc2 Ra2
8.Kf2 Rb3 9.Kg2 hxg4 10.hxg4 Kf8
11.Be2 Rb4 12.Kg3 Ke8 13.Bf3 f6
14.Kf2 Kd7 15.Ke2 (13.594.969.232) 329

best move: Qa2xb3 time: 803:15.922 min n/s: 330.974 nodes: 15.951.630.273

jarkkop · Post by **jarkkop** » Mon Nov 09, 2009 11:52 pm

6: STS(v7.0) Simplification.006, STS 7.0 Offer of Simplification
1q1rb1k1/5p1p/p3pnpb/P1r5/2B1P3/1P3P2/2R1N1PP/R2NQ2K b - - 0 1

After Bb5
2.Nb2 Bxc4 3.bxc4 Qc7 4.Qg3 Rd6 5.Qe1 Bg7 6.Nf4 Nd7 7.Nfd3 Rh5 8.g4 Rh3 9.Qf1 Rh6 10.Rd1 Bd4 11.Qe1 Ne5 12.Qg3
= (-0.06) Depth: 26/62 00:56:06 4931mN

Nd7 even better than Bb5

After Nd7

2.Ndc3 Ne5 3.Bxa6 Nc6 4.Rca2 Nb4 5.Bc4 Nxa2 6.Rxa2 Qb4 7.a6 Ra5 8.Rc2 Rc8 9.h3 Qd6 10.f4 Rxc4 11.bxc4 Qxa6 12.Qh4 Bf8 13.Qd8 Bc6 14.Nd4 Rc5 15.f5 exf5 16.exf5 Rxc4 17.Nxc6 Qxc6
= (-0.13) Depth: 23/57 00:05:38 451mN

Dann Corbit · Post by **Dann Corbit** » Tue Nov 10, 2009 6:57 am

jarkkop wrote:6: STS(v7.0) Simplification.006, STS 7.0 Offer of Simplification
1q1rb1k1/5p1p/p3pnpb/P1r5/2B1P3/1P3P2/2R1N1PP/R2NQ2K b - - 0 1

After Bb5
2.Nb2 Bxc4 3.bxc4 Qc7 4.Qg3 Rd6 5.Qe1 Bg7 6.Nf4 Nd7 7.Nfd3 Rh5 8.g4 Rh3 9.Qf1 Rh6 10.Rd1 Bd4 11.Qe1 Ne5 12.Qg3
= (-0.06) Depth: 26/62 00:56:06 4931mN

Nd7 even better than Bb5

After Nd7

2.Ndc3 Ne5 3.Bxa6 Nc6 4.Rca2 Nb4 5.Bc4 Nxa2 6.Rxa2 Qb4 7.a6 Ra5 8.Rc2 Rc8 9.h3 Qd6 10.f4 Rxc4 11.bxc4 Qxa6 12.Qh4 Bf8 13.Qd8 Bc6 14.Nd4 Rc5 15.f5 exf5 16.exf5 Rxc4 17.Nxc6 Qxc6
= (-0.13) Depth: 23/57 00:05:38 451mN

More analysis coming...
Here is Rybka with 4 CPUs and 2 GB RAM (8 GB on system):

Code: Select all

Analysis from C&#58;\test\sts7questions.epd   
11/9/2009 8&#58;02&#58;23 PM Level&#58; 6750 Seconds
Analyzing engine&#58; Rybka 3

1&#41;                      
    Avoid move&#58; 
    Best move &#40;Rybka 3&#41;&#58; Be8-b5
    Not found in&#58; 1&#58;52&#58;30
      2	00&#58;00	       1.352	86.528	-0.40	Be8c6
      2	00&#58;00	       2.031	129.984	+0.18	Be8b5
      3	00&#58;00	       2.457	157.248	+0.23	Be8b5
      4	00&#58;00	       4.332	138.624	+0.28	Be8b5
      5	00&#58;00	       5.256	168.192	+0.22	Be8b5 Nd1f2
      6	00&#58;00	      15.460	168.415	+0.28	Be8b5 Nd1f2 Bb5xc4
      7	00&#58;00	      23.170	168.270	+0.28	Be8b5 Nd1f2 Bb5xc4 b3xc4 Qb8c7
      8	00&#58;00	      40.573	147.328	+0.25	Be8b5 Qe1g3 Qb8xg3 Ne2xg3 Bb5xc4 Nd1b2 Bh6g7
      9	00&#58;00	      57.484	156.969	+0.25	Be8b5 Qe1g3 Qb8xg3 Ne2xg3 Bb5xc4 Nd1b2 Bh6g7 b3xc4 h7h6
     10	00&#58;01	      99.880	152.198	+0.22	Be8b5 Qe1g3 Qb8xg3 Ne2xg3 Bb5xc4 Nd1b2 Bh6g7 b3xc4 Nf6d7 f3f4 Bg7d4 Ra1d1
     11	00&#58;02	     302.288	156.177	+0.17	Be8b5 Nd1b2 Bb5xc4 b3xc4 Qb8c7 Qe1g3 Rd8d6 Qg3e1 Rd6d7 Qe1c3 Rc5h5
     12	00&#58;02	     373.982	154.356	+0.17	Be8b5 Nd1b2 Bb5xc4 b3xc4 Qb8c7 Qe1g3 Rd8d6 Qg3e1 Rd6d7 Qe1c3 Rc5h5
     13	00&#58;04	     557.650	157.049	+0.15	Be8b5 Nd1b2 Bb5xc4 b3xc4 Qb8c7 Qe1g3 Rd8d6 Qg3e1 Nf6d7 Qe1b4 Rc5h5
     13	00&#58;11	   2.071.940	190.728	+0.16	Nf6d7 Nd1c3 Nd7e5 Bc4xa6 Ne5c6 Rc2b2 Rc5h5 h2h3 Bh6g7 f3f4 Rh5xa5 Ra1xa5 Nc6xa5 b3b4 Qb8b6 Qe1h4
     14	00&#58;14	   2.653.972	191.209	+0.12	Nf6d7 Nd1c3 Nd7e5 Bc4xa6 Ne5c6 Rc2a2 Nc6b4 Ba6c4 Nb4xa2 Ra1xa2 Bh6e3 a5a6 Qb8c7 f3f4
     14	00&#58;17	   3.267.194	195.306	+0.26	Be8b5 Nd1b2 Bb5xc4 b3xc4 Qb8c7 Qe1g3 Rd8d6 Qg3e1 Nf6d7 Qe1b4 Rc5e5 g2g3
     15	00&#58;21	   3.808.455	187.250	+0.17	Be8b5 Nd1b2 Bb5xc4 b3xc4 Qb8c7 Qe1g3 Rd8d6 Qg3e1 Nf6d7 Qe1b4 Rc5e5 g2g3 Re5c5 f3f4
     16	00&#58;27	   4.792.517	178.839	+0.20	Be8b5 Nd1b2 Bb5xc4 b3xc4 Qb8c7 Qe1g3 Rd8d6 Qg3e1 Nf6d7 Qe1b4 Rc5h5 h2h3 Bh6f8 Qb4e1
     17	00&#58;48	   8.268.318	176.670	+0.18	Be8b5 Nd1b2 Bb5xc4 b3xc4 Qb8c7 Qe1g3 Qc7c6 Qg3e1 Nf6d7 Ra1d1 Qc6c7 f3f4 Bh6g7 e4e5 g6g5 f4xg5
     18	02&#58;00	  20.974.710	179.384	+0.25	Be8b5 Nd1b2 Bb5xc4 b3xc4 Qb8c7 Qe1g3 Qc7c6 Qg3e1 Nf6d7 Ra1d1 Qc6c7 f3f4 Bh6g7 e4e5 g6g5 f4xg5 Rc5xe5 Qe1g3 Qc7xa5 Rc2d2 Nd7f8 Rd2xd8 Re5xe2 Rd8xf8+ Bg7xf8 Nb2d3
     19	02&#58;26	  25.976.262	182.011	+0.25	Be8b5 Nd1b2 Bb5xc4 b3xc4 Qb8c7 Qe1g3 Qc7c6 Qg3e1 Nf6d7 Ra1d1 Qc6c7 f3f4 Bh6g7 e4e5 g6g5 f4xg5 Rc5xe5 Qe1g3 Qc7xa5 Rc2d2 Nd7f8 Rd2xd8 Re5xe2 Rd8xf8+ Bg7xf8 Nb2d3
     20	06&#58;50	  72.931.452	182.025	+0.16	Be8b5 Nd1b2 Bb5xc4 b3xc4 Qb8c7 Qe1g3 Qc7c8 Qg3f2 Bh6g7 Ne2f4 Qc8c7 Nf4d3 Rc5xa5 Ra1xa5 Qc7xa5 c4c5 Qa5a3 c5c6 Nf6e8 h2h3 Bg7d4 Qf2e2 Ne8c7 Kh1h2
     21	12&#58;47	 133.726.619	178.517	+0.16	Be8b5 Nd1b2 Bb5xc4 b3xc4 Qb8c7 Qe1g3 Qc7c8 Qg3f2 Bh6g7 Ne2f4 Qc8c7 Nf4d3 Rc5xa5 Ra1xa5 Qc7xa5 c4c5 Qa5a3 c5c6 Nf6e8 h2h3 Bg7d4 Qf2e2 Ne8c7 Kh1h2
     22	24&#58;13	 259.917.726	183.144	+0.20	Be8b5 Nd1b2 Bb5xc4 b3xc4 Qb8c7 Qe1g3 Qc7xg3 Ne2xg3 Nf6e8 Ng3f1 Bh6g7 Nf1d2 Ne8d6 g2g4 f7f5 Kh1g2 f5xg4 f3xg4 h7h5 h2h3 h5xg4 h3xg4 Rc5g5 Kg2h3 Nd6b7 Nd2f3
     23	42&#58;25	 454.825.873	183.003	+0.20	Be8b5 Nd1b2 Bb5xc4 b3xc4 Qb8c7 Qe1g3 Qc7xg3 Ne2xg3 Nf6e8 Ng3f1 Bh6g7 Nf1d2 Ne8d6 g2g4 f7f5 Kh1g2 f5xg4 f3xg4 h7h5 h2h3 h5xg4 h3xg4 Rc5g5 Kg2h3 Nd6b7 Nd2f3
     24	1&#58;18&#58;12	 854.679.113	186.540	+0.22	Be8b5 Nd1b2 Bb5xc4 b3xc4 Qb8c7 Qe1g3 Qc7xg3 Ne2xg3 Nf6e8 Ng3f1 Bh6g7 Nf1d2 Ne8d6 g2g4 f7f5 Kh1g2 f5xg4 f3xg4 h7h5 h2h3 h5xg4 h3xg4 Rc5g5 Kg2h3 Nd6b7 Nd2f3
   11/9/2009 9&#58;54&#58;58 PM, Time for this analysis&#58; 01&#58;52&#58;29, Rated time&#58; 1&#58;52&#58;30

Eelco de Groot · Post by **Eelco de Groot** » Tue Nov 10, 2009 12:55 pm

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

jarkkop · Post by **jarkkop** » Tue Nov 10, 2009 8:19 pm

STS7 pos:009

1r2r1k1/5pp1/R2p3n/3P1P1p/2p2PP1/1qb2B1P/Q7/2BR1K2 b - - 0 1

1...Bd2 2.Qxb3 Rxb3 3.Ra3 Bxc1 4.Rxb3 cxb3 5.Rxc1 b2 6.Rb1 Re3 7.Kg2 Rb3 8.Bd1 Rb4 9.Kf2 Kf8 10.Bf3 hxg4 11.hxg4 Ng8 12.Ke2 Nf6 13.Kd2 Rxf4 14.Ke3 Rb4 15.Kd2 Rb3 16.Bd1 Rb5 17.Be2
µ (-1.08) Depth: 27/67 00:54:21 4527mN

jarkkop · Post by **jarkkop** » Tue Nov 10, 2009 8:41 pm

STS7:position 012
1r4k1/3b1pbp/R2Np1p1/4n3/1P1NP3/3BP3/4K1PP/8 w - - 0 1

1. = (0.00): 1.Nf3 Nxf3 2.gxf3 Bf8 3.e5 Rxb4 4.Kd2 Ra4 5.Kc3 Kg7 6.Rxa4 Bxa4 7.Kd4 Be7 8.f4 Bd8 9.Bb5 Bc2 10.Bc6
2. = (0.00): 1.b5 Bf8 2.Nc4 Nxd3 3.Kxd3 Bxb5 4.Nxb5 Rxb5 5.e5 Rd5+ 6.Ke4 Rc5 7.Kd4 Rd5+ 8.Kc3 Rd1 9.Ra2 g5 10.Rd2 Rc1+ 11.Kd3 Kg7 12.h3 Kg6 13.Ra2 h5 14.Ra7 Rd1+ 15.Ke2 Rb1 16.Kf2 f5

Why Nf3 is so much better than b5? I can't see any big score.

jarkkop · Post by **jarkkop** » Tue Nov 10, 2009 9:12 pm

STS7, position 020
[D]2q1r1k1/1p2rpp1/p1p3pb/2Pp2n1/3P1R2/1Q2P1P1/PP3NKP/2B2R2 b - - 0 1

No real difference with moves below: Qe6 and Rf8 missing as solutions

1. ³ (-0.60): 1...Nh7 2.Rf3 Qe6 3.Qc2 Qd7 4.Qd3 Ng5 5.Rf4 Ne4 6.Rf3 Qd8 7.Qb3 Ng5 8.Rf4 Nh7 9.Rf3 Qc8 10.Qd3 Ng5 11.Rf4 Ne4 12.Rf3 Qc7 13.Qb3 Ng5 14.Rf4 Nh7 15.Rf3 Qc8
2. ³ (-0.60): 1...Qe6 2.Qc2 Qd7 3.Qd3 Ne4 4.Rf3 Qc7 5.Qb3 Ng5 6.Rf4 Nh7 7.Rf3 Qc8 8.Qd3 Ng5 9.Rf4 Qd7 10.Qb3 Nh7 11.Rf3 Kh8 12.Kg1 f5 13.h4 Nf6 14.Bd2 g5 15.hxg5 Bxg5
3. ³ (-0.60): 1...Qd7 2.Qd3 Ne4 3.Rf3 Qc7 4.Qb3 Ng5 5.Rf4 Nh7 6.Rf3 Qc8 7.Qd3 Ng5 8.Rf4 Ne4 9.Rf3 Qd8 10.Qb3 Ng5 11.Rf4 Nh7 12.Rf3 Qd7 13.Qd3 Nf6 14.Qa3 Qe6 15.Qd3 Qd7
4. ³ (-0.60): 1...Rf8 2.Qd3 Ne4 3.Rf3 Qd7 4.Qc2 Ng5 5.Rf4 Nh7 6.Rf3 Rfe8 7.Qd3
5. ³ (-0.58): 1...Ne4 2.Rf3 Nf6 3.Qd3 Nh7 4.h4 Nf6 5.b4 Ne4 6.Qc2 Nxf2 7.Qxf2 f6 8.Qc2 Re4 9.Qd3 g5 10.hxg5 Bxg5 11.a4 Qe6 12.Re1 Bh6 13.b5 axb5 14.axb5 Qg4 15.bxc6 bxc6

Dann Corbit · Post by **Dann Corbit** » Tue Nov 10, 2009 9:17 pm

jarkkop wrote:STS7:position 012
1r4k1/3b1pbp/R2Np1p1/4n3/1P1NP3/3BP3/4K1PP/8 w - - 0 1

1. = (0.00): 1.Nf3 Nxf3 2.gxf3 Bf8 3.e5 Rxb4 4.Kd2 Ra4 5.Kc3 Kg7 6.Rxa4 Bxa4 7.Kd4 Be7 8.f4 Bd8 9.Bb5 Bc2 10.Bc6
2. = (0.00): 1.b5 Bf8 2.Nc4 Nxd3 3.Kxd3 Bxb5 4.Nxb5 Rxb5 5.e5 Rd5+ 6.Ke4 Rc5 7.Kd4 Rd5+ 8.Kc3 Rd1 9.Ra2 g5 10.Rd2 Rc1+ 11.Kd3 Kg7 12.h3 Kg6 13.Ra2 h5 14.Ra7 Rd1+ 15.Ke2 Rb1 16.Kf2 f5

Why Nf3 is so much better than b5? I can't see any big score.

Here is the primary Epd record and the alternate evals:

[d]1r4k1/3b1pbp/R2Np1p1/4n3/1P1NP3/3BP3/4K1PP/8 w - - acd 24; acn 316286029; acs 1356; bm Nf3; ce 12; id "STS(v7.0) Simplification.082"; pv Nf3 Nxf3 gxf3 Bf8 e5 Rxb4 Ra7 Rb2+ Ke1 Bc6 Be2 Rb1+ Kf2 Rh1 Rc7 Rxh2+ Kf1 Rh1+ Kg2 Rc1 Kg3 Rc5 Ba6 h5 Rc8 Rxe5 Rxc6 Rxe3 Ne4 h4+ Kxh4;

1r4k1/3b1pbp/R2Np1p1/4n3/1P1NP3/3BP3/4K1PP/8 w - - acd 21; acn 374692952; bm Nf3; ce -8; id "STS(v7.0) Simplification.082"; pv Nc4 Nxc4 Bxc4 Rxb4 Ra8+ Bf8 Kd3 Ra4 Rd8 Ra3+ Ke2 Ra7 Bb5 Bxb5+ Nxb5 Ra2+ Kf3;

1r4k1/3b1pbp/R2Np1p1/4n3/1P1NP3/3BP3/4K1PP/8 w - - acd 21; acn 350738172; bm Nf3; ce 0; id "STS(v7.0) Simplification.082"; pv Ra7 Rxb4 Nf3 Ra4 Rc7 Ra2+ Kf1 Nxd3 Rxd7 Bh6 Rd8+ Bf8 Ne8 Nc5 Nf6+ Kg7 e5 h6 Nd2 h5 Nf3 Ra1+ Kf2 Ra2+ Kg3 Rb2 Ng5 Rb3 Ne8+ Kg8;

1r4k1/3b1pbp/R2Np1p1/4n3/1P1NP3/3BP3/4K1PP/8 w - - acd 22; acn 533333542; bm Nf3; ce 0; id "STS(v7.0) Simplification.082"; pv b5 Bf8 Nc4 Nxd3 Kxd3 Bxb5 Nxb5 Rxb5 e5 Rb1 Ra7 Rh1 h3 Rc1 Ra2 g5 Rc2 Ra1 Ke4 h5 Rd2 Ra4 Kd4 Kg7 Rf2;

Eelco de Groot · Post by **Eelco de Groot** » Tue Nov 10, 2009 9:20 pm

Hello Jarkko,

Thanks for all the analysis,
I'm just a little curious, what engine you are using? A modified Toga or something else?

Regards, Eelco

STS (v7.0) - "Offer of Simplification"

Re: STS (v7.0) - "Offer of Simplification"

Re: STS (v7.0) - "Offer of Simplification"

Re: STS (v7.0) - "Offer of Simplification"

Re: STS (v7.0) - "Offer of Simplification"

Re: STS (v7.0) - "Offer of Simplification"

Re: STS (v7.0) - "Offer of Simplification"

Re: STS (v7.0) - "Offer of Simplification"

Re: STS (v7.0) - "Offer of Simplification"

Re: STS (v7.0) - "Offer of Simplification"

Re: STS (v7.0) - "Offer of Simplification"