EvgeniyZh wrote:8/p2k1pp1/r3p1p1/8/1P6/P1R1PKPP/5P2/8 b - - bm Rd6
Does White not still get a big advantage? I can't check with tablebases. This is what our tactical consultant, Tommy Cooper, says, without tablebases:
1...Rd6 2. Ke2 {best four Multi PV}
[D]8/p2k1pp1/3rp1p1/8/1P6/P1R1P1PP/4KP2/8 b - -
Engine: Tommy Cooper_006 MP (512 MB)
by T. Romstad, M. Costalba, J. Kiiski, G. Linscott
28 60:33 +2.16 2...Rb6 3.Kd3 g5 4.Kc4 Kc7 5.a4 a6
6.Kb3+ Kb7 7.Rc4 g6 8.Rg4 Rc6 9.Rxg5 Rc1
10.Rg4 Rb1+ 11.Kc4 Kc6 12.Rf4 f5
13.Rh4 Rc1+ 14.Kd4 Kd6 15.Rh8 Rb1 (19.311.793.873) 5314
28 60:33 +2.22 2...Ra6 3.h4 e5 4.Kd3 Rd6+ 5.Ke4 f6
6.a4 Rb6 7.Rc4 Rd6 8.b5 a6 9.Rb4 axb5
10.axb5 Rd2 11.b6 Kc8 12.Rc4+ Kb7
13.Rc7+ Kxb6 14.Rxg7 Rxf2 15.Rxg6 Kc6 (19.311.793.873) 5314
28 60:33 +2.31 2...Ke8 3.h4 Ra6 4.Kd3 Kd7 5.Kc2 Rb6
6.Kb3 a6 7.a4 e5 8.Rc5 Rf6 9.Rc2 Rb6
10.a5 Rd6 11.b5 axb5 12.Kb4 Rd1
13.Kxb5 Rb1+ 14.Ka6 Ra1 15.Rb2 Kc8 (19.311.793.873) 5314
28 60:33 +5.73 2...a6 3.Rd3 Kc6 4.Rxd6+ Kxd6 5.Kd3 g5
6.a4 Kc7 7.Kc4 Kd6 8.e4 f6 9.Kd4 Kc6
10.e5 f5 11.Kc4 Kb7 12.Kc5 Kc7 13.b5 axb5
14.axb5 Kb7 15.Kd6 Kb8 (19.311.793.873) 5314
_____________________________________________________
29 98:29 +2.11 2...Rb6 3.Kd3 e5 4.h4 a5 5.Kc4 Rc6+
6.Kb3 a4+ 7.Kc2 Rf6 8.f4 Re6 9.Kd2 Rf6
10.Rc5 Rd6+ 11.Ke2 e4 12.Ra5 Rc6
13.Rxa4 Rc2+ 14.Ke1 Rc3 15.Kd2 Rd3+ (31.348.055.141) 5304
29 98:29 +2.29 2...Ra6 3.h4 e5 4.Kd3 Rf6 5.Rc2 Ra6
6.Ra2 Rc6 7.b5 Rc1 8.a4 Rb1 9.Kc2 Rf1
10.Kc3 Kc7 11.Kb4 Kb6 12.a5+ Kb7
13.Kc5 a6 14.Rb2 axb5 15.Rxb5+ Ka6 (31.348.055.141) 5304
29 98:29 +2.37 2...Ke8 3.h4 Ra6 4.Kd3 Kd7 5.Kc2 Rb6
6.Kb3 a6 7.a4 e5 8.Rc5 Rf6 9.Rc2 Rb6
10.a5 Rb8 11.Rc5 Kd6 12.Kc4 f6 13.b5 axb5+
14.Rxb5 Rc8+ 15.Kb4 Rc1 (31.348.055.141) 5304
29 98:29 +6.08 2...Ke7 3.Rc7+ Ke8 4.Rxa7 e5 5.a4 Rf6
6.b5 Kd8 7.a5 Kc8 8.Kd3 Kb8 9.Re7 Rxf2
10.Kc4 Rc2+ 11.Kd5 f5 12.a6 Rc8
13.a7+ Ka8 14.b6 Rg8 15.Kxe5 Rf8 (31.348.055.141) 5304
_____________________________________________________
30 172:22 +2.32 2...Rb6 3.Kd3 g5 4.Kc4 e5 5.Rd3+ Kc8
6.Rd5 Re6 7.a4 Kc7 8.b5 Rf6 9.a5 Rxf2
10.Rxe5 Rc2+ 11.Kb3 Rg2 12.Re7+ Kb8
13.a6 Rf2 14.Kc4 g6 15.Rb7+ Ka8 (54.563.991.409) 5275
30 172:22 +2.38 2...Ra6 3.h4 e5 4.Kd3 Rf6 5.Rc2 Rd6+
6.Kc4 Kc6 7.a4 Kb6 8.a5+ Kb7 9.b5 Rd1
10.Ra2 Kc7 11.Rb2 Ra1 12.b6+ axb6
13.axb6+ Kb7 14.Kc5 Ra8 15.Rd2 Ra5+ (54.563.991.409) 5275
30 172:22 +2.52 2...Ke8 3.h4 Rb6 4.Kd3 Kd8 5.Kc4 a6
6.a4 e5 7.Rd3+ Kc7 8.Rd5 Re6 9.Rc5+ Kb7
10.Kd5 e4 11.Rc2 g5 12.hxg5 Rg6
13.Rc4 Rxg5+ 14.Kxe4 Rh5 15.Kf3 Rh8 (54.563.991.409) 5275
30 172:22 +6.53 2...Ke7 3.Rc7+ Kf6 4.Rxa7 Ke5 5.b5 f6
6.a4 Rb6 7.Rxg7 Rb8 8.Rxg6 Kf5 9.Rg4 Ke5
10.h4 Kd6 11.Rg6 Ra8 12.Rxf6 Rxa4
13.h5 Rb4 14.h6 Rxb5 15.g4 Rb8 (54.563.991.409) 5275
1...Rd6 2. Ke2 Rb6 3. Kd3
[D]8/p2k1pp1/1r2p1p1/8/1P6/P1RKP1PP/5P2/8 b - -
Engine: Tommy Cooper MP 006 (Latest Stockfish Master from 2016-06-18 with some added Retro extensions, i7 6700, Family 6, Model 94, Stepping 3, 3408MHz, No Overclock, 512 MB TT)
by T. Romstad, M. Costalba, J. Kiiski, G. Linscott
17/40 0:01 +1.49 3...g5 4.Kc4 Kc7 5.Kb3+ Kb7 6.Rd3 Kc7
7.a4 a6 8.Rc3+ Kb7 9.Rc5 f6 10.b5 Rd6
11.a5 axb5 12.Rxb5+ Ka6 13.Kb4 (12.362.171) 7451
18/52 0:02 +1.56 3...g5 4.Kc4 Rc6+ 5.Kb3 Rd6 6.a4 Rd5
7.b5 Rd2 8.Rc6 Rxf2 9.Ra6 Kc7
10.Rxa7+ Kb6 11.Rd7 Re2 12.Kb4 Rb2+
13.Kc4 Ra2 14.Rd6+ Kc7 15.Ra6 Kb7
16.Kc5 Rc2+ (17.516.125) 7507
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30/66 7:31 +2.06 3...Kd6 4.Kc4 Kc6 5.a4 a6 6.h4 Rb8
7.Kb3+ Kb7 8.Rc4 Ra8 9.Kc3 Rh8
10.Rf4 Rc8+ 11.Kd3 Rf8 12.Rd4 Kc7
13.Kc4 Rc8 14.Rf4 Kb6+ 15.Kd3 Rf8
16.Ke4 f6 (3.494.415.008) 7740
31/66 9:35 +2.11 3...Rd6+ 4.Kc2 Rb6 5.Kb3 a5 6.Rc5 axb4
7.axb4 Kd6 8.Kc4 Ra6 9.Ra5 Rc6+
10.Kd4 e5+ 11.Rxe5 Rc2 12.f4 Rd2+
13.Ke4 Rb2 14.Rd5+ Kc7 15.b5 Rb1
16.h4 Rg1 (4.451.644.996) 7732
32/82 17:22 +2.17 3...g5 4.Kc4 Rc6+ 5.Kb3 Rd6 6.a4 Rd2
7.Rc2 Rd3+ 8.Kc4 Ra3 9.a5 Kc7 10.b5 Kb8
11.Kb4 Ra1 12.Rc5 Rb1+ 13.Kc4 Rc1+
14.Kd4 Rd1+ 15.Ke4 f6 16.Rc6 Rd5 (8.073.795.804) 7742
33/86 25:20 +2.20 3...g5 4.Kc4 Kc6 5.a4 a6 6.Kb3+ Kb7
7.Rc4 Kb8 8.Re4 Kc8 9.Rd4 e5 10.Rg4 f6
11.h4 gxh4 12.gxh4 Rb7 13.Kc4 Rd7
14.Kc5 Kb7 15.Rg6 Kc7 16.h5 Kb7 (11.812.704.732) 7766
34/86 32:55 +2.21 3...Rd6+ 4.Kc2 Rb6 5.Kb3 a5 6.Rc5 axb4
7.axb4 Kd6 8.Kc4 Ra6 9.Ra5 Rc6+
10.Kd4 e5+ 11.Rxe5 Rc2 12.f4 Rd2+
13.Ke4 Rb2 14.Rd5+ Kc7 15.b5 Rb1
16.Rc5+ Kd6 (15.403.852.120) 7799
35/86 45:30 +2.28-- 3...Rd6+ 4.Kc2 (19.732.664.052) 7226
35/86 83:18 +2.35-- 3...Rd6+ 4.Kc2 (31.849.771.467) 6371
35/86 137:16 +2.39 3...a5 4.Kc4 axb4 5.axb4 e5 6.Ra3 e4
7.Ra7+ Ke8 8.h4 Rf6 9.Ra2 Ke7 10.Kd4 Rb6
11.Kc5 Rf6 12.Kd5 Rb6 13.Ra7+ Ke8
14.Ra4 Rf6 15.Ra2 Rb6 16.Kc4 Rf6 (49.089.540.332) 5959
36/86 168:06 +2.46-- 3...a5 4.Kc4 (58.615.809.265) 5811