A mate suite to test multi-pv and new engines

[Uri Blass]

Analyzed the positions by the mate solver chest
They include all the positions of all the pieces against the following pieces in their initial position

1)king(1 position)
2)king and a pawn(8 positions)
3)king and 2 pawns(28 positions)
4)king and 3 pawns(56 positions)
5)king and a knight or bishop(4 positions)
6)king and 4 pawns that include a7,b7 when the solution is mate in not more than 8 moves

Ordered the positions based on number of nodes to see the mate.

I think that it may be good if new engines can beat chest (meaning finding all the solutions in multi-pv with smaller number of nodes)
Note that i used for chest 1024 mbytes hash and I think chest that use only one core is deterministic in the number of nodes to solve a problem

4k3/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #6; 00:00; 1.e4 747149 nodes
4k3/5p2/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; Duals(2); 00:14; bm 1.e4 1.d4 13535690 nodes
4k3/2p5/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; Duals(2); 00:14;bm 1.e4 1.d4 13749556 nodes
4k3/3p4/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; Duals(2); 00:15;bm 1.e4 1.d4 14414332 nodes
4k3/4p1p1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; 00:20; bm 1.e4 16615280 nodes
4k3/4p3/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; Duals(2); 00:18;bm 1.e4 1.d4 17483475 nodes
4k3/6p1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; Duals(4); 00:19;bm 1.e3 1.e4 1.d4 1.Nc3 17856637 nodes
4k3/7p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; Duals(6); 00:19; bm 1.e3 1.e4 1.d4 1.b3 1.b4 1.Nc3 18044233 nodes
4k3/1p6/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; Duals(3); 00:19; bm 1.e4 1.d4 1.Nc3 18324223 nodes
4k3/p3p3/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; 00:19; bm 1.e4 18378753 nodes
4k3/p4p2/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; Duals(2); 00:22; bm 1.e4 1.d4 19173511 nodes
4k3/p7/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; Duals(5); 00:20; bm 1.e3 1.e4 1.d4 1.b3 1.Nc3 19297707 nodes
4k3/6pp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; 00:23; bm 1.e4 19310617 nodes
4k3/1p5p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; Duals(2); 00:21;bm 1.e4 1.d4 19416286 nodes
4k3/p1p5/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; Duals(2); 00:21; bm 1.e4 1.d4 19710378 nodes
4k3/p5p1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; Duals(2); 00:23; bm 1.e4 1.d4 21096678 nodes
4k3/5p1p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; 00:31; 1.e4 21923196 nodes
4k3/4p2p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; Duals(2); 00:26; bm 1.e4 1.d4 22021054 nodes
4k3/pp6/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; 00:27; bm 1.d4 24748495 nodes
4k3/p2p4/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; Duals(2); 00:29; bm 1.e4 1.d4 27823342 nodes
4k3/p6p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; Duals(5); 00:32; bm 1.e3 1.e4 1.d4 1.b3 1.Nc3 30173389 nodes
4k3/p5pp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; 00:34; bm 1.e4 32220381 nodes
4k3/pp5p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; 00:38; bm 1.d4 33724811 nodes
1n2k3/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; 02:50; bm 1.e4 144653840 nodes
4kb2/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(2); 04:22; 1.e3 1.e4 231934358 nodes
4k1n1/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(2); 06:11; 1.e4 1.d4 265643243 nodes
4k3/2pp2p1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(2); 06:04; 1.e4 1.d4 325729588 nodes
4k3/1p2pp2/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(2); 07:38; bm 1.e4 1.d4 363643253 nodes
4k3/1p3p2/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(7); 06:55; bm 1.e3 1.e4 1.d3 1.d4 1. b4 1.Na3 1.Nc3 380569315 nodes
4k3/2p2p2/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(4); 06:47; bm 1.e3 1.e4 1.d4 1.Nc3 383568904 nodes
4k3/3ppp2/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; 07:32; bm 1.e4 394314169 nodes
4k3/3p2p1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(7); 07:11; bm 1.e3 1.e4 1.d4 1.b3 1.b4 1.Nh3 1.Nc3 411883333 nodes
4k3/3p1p2/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(5); 07:50; bm 1.e3 1.e4 1.d4 1.b3 1.Nc3 424043968 nodes
4k3/4pp2/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(6); 08:34; bm 1.e3 1.e4 1.d4 1.b3 1.b4 1.Nc3 427150786 nodes
4k3/1pp2p2/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(2); 08:08; 1.e4 1.d4 446630214 nodes
4k3/3pp3/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(6); 07:54; bm 1.e3 1.e4 1.d4 1.b3 1.Na3 1.Nc3 452514368 nodes
4k3/2p2pp1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; 08:06; bm 1.e3 453284579 nodes
4k3/1p2p3/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(10); 08:19; bm 1.h4 1.e3 1.e4 1.d3 1.d4 1.b3 1.b4 1.a4 1.Na3 1.Nc3 463111148 nodes
4k3/5pp1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(5); 09:48; bm 1.e3 1.e4 1.d4 1.b3 1.b4 467123774 nodes
4k3/1p1p2p1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(4); 11:05; bm 1.e3 1.e4 1.d4 1.Nc3 508493406 nodes
4k3/3p2pp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(5); 11:43; bm 1.e3 1.e4 1.d4 1.b3 1.Nc3 523731683 nodes
4k3/1p4p1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(13); 09:33; am 1.h3 1.f3 1.f4 1.c4 1.a3 1.Nh3 1.Nf3 529173862 nodes
4k3/pp2p1p1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; 10:06; bm 1.e4 539567365 nodes
4k3/1pp3p1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(2); 10:36; bm 1.e4 1.d4 540147105 nodes
4k3/3p1p1p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(4); 10:33; bm 1.e4 1.d4 1.b3 1.Nc3 542327119 nodes
4k3/2pp3p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(2); 10:17; bm 1.e4 1.d4 544280256 nodes
4k3/1p1pp3/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; 11:23; bm 1.e4 577882868 nodes
4k3/1p2p1p1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(4); 10:32; bm 1.e3 1.e4 1.Na3 1.Nc3 577957939 nodes
4k3/1p3p1p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(4); 10:49; bm 1.e3 1.e4 1.d4 1.Nc3 580471647 nodes
4k3/2p3p1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(15); 10:13; am 1.h3 1.f3 1.f4 1.d3 1.a3 580526492 nodes
4k3/1p3pp1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(3); 11:35; bm 1.e3 1.e4 1.d4 580939945 nodes
4k3/p2p2p1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(5); 12:08; bm 1.e3 1.e4 1.d4 1.b3 1.Nc3 584331662 nodes
4k3/p3pp2/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(3); 12:22; bm 1.e3 1.e4 1.d4 587285032 nodes
4k3/2pp4/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(5); 10:13; bm 1.g3 1.e3 1.e4 1.d4 1.Nc3 596041645 nodes
4k3/3pp1p1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; 11:39; bm 1.e4 606809942 nodes
4k3/1p1p1p2/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(3); 12:31; bm 1.e4 1.d4 1.Nc3 607187811 nodes
4k3/2p2p1p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(4); 10:49; bm 1.e3 1.e4 1.d4 1.Nc3 610234093 nodes
4k3/4ppp1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; 11:47; bm 1.e3 610379804 nodes
4k3/1p1p4/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(7); 10:59; bm 1.e3 1.e4 1.d4 1.b4 1.a4 1.Na3 1.Nc3 624267773 nodes
4k3/1ppp4/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(2); 12:12; bm 1.e4 1.d4 631906180 nodes
4k3/pp2p3/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(3); 11:27; bm 1.e3 1.e4 1.d4 645107943 nodes
4k3/1pp5/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(9); 11:12; bm 1.g3 1.g4 1.e3 1.e4 1.d3 1.d4 1.a4 1.Na3 1.Nc3 648343211 nodes
4k3/p2pp3/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(4); 12:17; bm 1.e3 1.e4 1.d4 1.b3 649885576 nodes
4k3/3p3p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(14); 11:17; am 1.h3 1.g4 1.f3 1.f4 1.c3 1.a3 653387096 nodes
4k3/p1p2p2/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(3); 15:18; bm 1.e3 1.e4 1.d4 657427917 nodes
4k3/2p1p3/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(9); 11:21; bm 1.e3 1.e4 1.d4 1.b3 1.b4 1.a4 1.Nh3 1.Na3 1.Nc3 657739805 nodes
4k3/1pp1p3/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; 11:31; bm 1.e4 663096104 nodes
4k3/1p2p2p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(8); 12:16; bm 1.h4 1.e3 1.e4 1.d4 1.b4 1.a4 1.Na3 1.Nc3 665226787 nodes
4k3/3pp2p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(3); 12:53; bm 1.e3 1.e4 1.d4 669511606 nodes
4k3/4pp1p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(5); 14:01; bm 1.e3 1.e4 1.d4 1.b3 1.b4 670444406 nodes
4k3/p4pp1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(4); 12:39; bm 1.e3 1.e4 1.d4 1.b3 676491845 nodes
4k3/2p4p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(16); 11:33; am 1.h3 1.f3 1.f4 1.a3 677782692 nodes
4k3/2p3pp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(6); 12:37; bm 1.e3 1.e4 1.d4 1.b3 1.b4 1.Nc3 680998122 nodes
4k3/5ppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(5); 13:31; bm 1.e3 1.e4 1.d4 1.b3 1.b4 682341819 nodes
4k3/pp2p2p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; 13:10; bm 1.e4 710955024 nodes
4k3/pp3p2/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(4); 14:05; bm 1.e3 1.e4 1.d4 1.Nc3 712106359 nodes
4k3/4p1pp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(8); 15:17; bm 1.e3 1.e4 1.d4 1.b3 1.b4 1.Nf3 1.Na3 1.Nc3 714871494 nodes
4k3/p2p1p2/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(4); 13:23; bm 1.e3 1.e4 1.d4 1.Nc3 732385653 nodes
4k3/2p1p1p1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(2); 13:12;bm 1.e3 1.e4 734249687 nodes
2b1k3/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(2); 13:38; bm 1.e4 1.d4 742282007 nodes
4k3/1p4pp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(8); 14:27; bm 1.h4 1.e3 1.e4 1.d4 1.c3 1.b4 1.Na3 1.Nc3 768536324 nodes
4k3/p1pp4/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(2); 14:03; bm 1.e4 1.d4 780674354 nodes
4k3/pp1p1p2/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(2); 15:35; bm 1.e4 1.Nc3 785384620 nodes
4k3/pp1p4/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(4); 15:45; bm 1.e3 1.e4 1.d4 1.Nc3 822328044 nodes
4k3/p3p1p1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(8); 15:09; bm 1.e3 1.e4 1.d4 1.c3 1.b3 1.Nf3 1.Nh3 1.Nc3 822416150 nodes
4k3/1p1p3p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(4); 16:21; bm 1.e3 1.e4 1.d4 1.Nc3 827972542 nodes
4k3/2p1p2p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(4); 14:53; bm 1.e3 1.e4 1.d4 1.b3 842166529 nodes
4k3/pp1p2p1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(4); 16:30;bm 1.e3 1.e4 1.d4 1.Nc3 854584919 nodes
4k3/ppp3p1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(2); 15:58; bm 1.e4 1.d4 887122087 nodes
4k3/p4p1p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(7); 16:02; bm 1.e3 1.e4 1.d4 1.b3 1.b4 1.Nh3 1.Nc3 898181002 nodes
4k3/p1p3p1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(10); 18:41;bm 1.h4 1.g3 1.g4 1.e3 1.e4 1.d4 1.c3 1.b3 1.Nf3 1.Nc3 934633651 nodes
4k3/pppp4/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(2); 20:03; bm 1.e4 1.d4 957543458 nodes
4k3/pp4p1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(7); 18:34; bm 1.h4 1.e3 1.e4 1.d4 1.c3 1.a4 1.Nc3 1005276320 nodes
4k3/p3p2p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(13); 21:06; am 1.h3 1.g4 1.f3 1.d3 1.c3 1.a3 1.Nh3 1009378534 nodes
4k3/1pp4p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(7); 18:57; bm 1.g3 1.e3 1.e4 1.d4 1.a4 1.Na3 1.Nc3 1041272615 nodes
4k3/pp3p1p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(4); 20:15; bm 1.e3 1.e4 1.d4 1.Nc3 1049370753 nodes
4k3/p2p3p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(7); 20:26; bm 1.h4 1.e3 1.e4 1.d4 1.c4 1.b3 1.Nc3 1051088324 nodes
4k3/pp4pp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(4); 21:15; bm 1.e3 1.e4 1.d4 1.Nc3 1052750689 nodes
4k3/ppp5/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(7); 19:50; bm 1.g3 1.e3 1.e4 1.d3 1.d4 1.a4 1.Nc3 1054780915 nodes
4k3/pp1p3p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(4); 21:18; bm 1.e3 1.e4 1.d4 1.Nc3 1071675207 nodes
4k3/p1p1p3/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(6); 20:14; bm 1.e3 1.e4 1.d4 1.b3 1.b4 1.Na3 1125713108 nodes
4k3/p1p4p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(15); 24:53; am 1.h3 1.f3 1.f4 1.a3 1.Na3 1293301528 nodes
4k3/ppp4p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(6); 27:20; bm 1.g3 1.e3 1.e4 1.d3 1.d4 1.Nc3 1475520423 nodes
4k3/3p1pp1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #9; Duals(9); 6:25:03; bm 1.h4 1.e3 1.e4 1.d4 1.b3 1.b4 1.a4 1.Nh3 1.Nc3 19917184920 nodes
4k3/2pp1p2/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #9; Duals(12); 6:34:29; am 1.h3 1.g4 1.f3 1.f4 1.c3 1.c4 1.a3 1.Nc3 1.Nf3 20834157525 nodes
4k3/2ppp3/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #9; Duals(16); 6:40:17 am 1.g4 1.f3 1.f4 1.d3 21655345472 nodes
4k3/2p1pp2/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #9; Duals(12); 6:57:05; am 1.h3 1.g4 1.f3 1.f4 1.d3 1.c4 1.a3 1.Nh3 22427378976 nodes

[zullil]

Analyzed the positions by the mate solver chest
They include all the positions of all the pieces against the following pieces in their initial position

1)king(1 position)
2)king and a pawn(8 positions)
3)king and 2 pawns(28 positions)
4)king and 3 pawns(56 positions)
5)king and a knight or bishop(4 positions)
6)king and 4 pawns that include a7,b7 when the solution is mate in not more than 8 moves

Ordered the positions based on number of nodes to see the mate.

I think that it may be good if new engines can beat chest (meaning finding all the solutions in multi-pv with smaller number of nodes)
Note that i used for chest 1024 mbytes hash and I think chest that use only one core is deterministic in the number of nodes to solve a problem

4k3/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #6; 00:00; 1.e4 747149 nodes

[d]4k3/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ -

Chest crushes Cfish-dev (1 thread, 1024 MB hash) on position one:

info depth 46 seldepth 14 multipv 1 score mate 6 nodes 22070937 nps 4487787 hashfull 69 tbhits 0 time 4918 pv e2e4 e8e7 d1g4 e7f6 g4d7 f6g6 d2d4 g6f6 f1c4 f6g6 d7f7

[MikeB]

Analyzed the positions by the mate solver chest
They include all the positions of all the pieces against the following pieces in their initial position

1)king(1 position)
2)king and a pawn(8 positions)
3)king and 2 pawns(28 positions)
4)king and 3 pawns(56 positions)
5)king and a knight or bishop(4 positions)
6)king and 4 pawns that include a7,b7 when the solution is mate in not more than 8 moves

Ordered the positions based on number of nodes to see the mate.

I think that it may be good if new engines can beat chest (meaning finding all the solutions in multi-pv with smaller number of nodes)
Note that i used for chest 1024 mbytes hash and I think chest that use only one core is deterministic in the number of nodes to solve a problem

4k3/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #6; 00:00; 1.e4 747149 nodes
4k3/5p2/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; Duals(2); 00:14; bm 1.e4 1.d4 13535690 nodes
4k3/2p5/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; Duals(2); 00:14;bm 1.e4 1.d4 13749556 nodes
4k3/3p4/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; Duals(2); 00:15;bm 1.e4 1.d4 14414332 nodes
4k3/4p1p1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; 00:20; bm 1.e4 16615280 nodes
4k3/4p3/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; Duals(2); 00:18;bm 1.e4 1.d4 17483475 nodes
4k3/6p1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; Duals(4); 00:19;bm 1.e3 1.e4 1.d4 1.Nc3 17856637 nodes
4k3/7p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; Duals(6); 00:19; bm 1.e3 1.e4 1.d4 1.b3 1.b4 1.Nc3 18044233 nodes
4k3/1p6/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; Duals(3); 00:19; bm 1.e4 1.d4 1.Nc3 18324223 nodes
4k3/p3p3/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; 00:19; bm 1.e4 18378753 nodes
4k3/p4p2/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; Duals(2); 00:22; bm 1.e4 1.d4 19173511 nodes
4k3/p7/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; Duals(5); 00:20; bm 1.e3 1.e4 1.d4 1.b3 1.Nc3 19297707 nodes
4k3/6pp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; 00:23; bm 1.e4 19310617 nodes
4k3/1p5p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; Duals(2); 00:21;bm 1.e4 1.d4 19416286 nodes
4k3/p1p5/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; Duals(2); 00:21; bm 1.e4 1.d4 19710378 nodes
4k3/p5p1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; Duals(2); 00:23; bm 1.e4 1.d4 21096678 nodes
4k3/5p1p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; 00:31; 1.e4 21923196 nodes
4k3/4p2p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; Duals(2); 00:26; bm 1.e4 1.d4 22021054 nodes
4k3/pp6/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; 00:27; bm 1.d4 24748495 nodes
4k3/p2p4/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; Duals(2); 00:29; bm 1.e4 1.d4 27823342 nodes
4k3/p6p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; Duals(5); 00:32; bm 1.e3 1.e4 1.d4 1.b3 1.Nc3 30173389 nodes
4k3/p5pp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; 00:34; bm 1.e4 32220381 nodes
4k3/pp5p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #7; 00:38; bm 1.d4 33724811 nodes
1n2k3/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; 02:50; bm 1.e4 144653840 nodes
4kb2/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(2); 04:22; 1.e3 1.e4 231934358 nodes
4k1n1/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(2); 06:11; 1.e4 1.d4 265643243 nodes
4k3/2pp2p1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(2); 06:04; 1.e4 1.d4 325729588 nodes
4k3/1p2pp2/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(2); 07:38; bm 1.e4 1.d4 363643253 nodes
4k3/1p3p2/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(7); 06:55; bm 1.e3 1.e4 1.d3 1.d4 1. b4 1.Na3 1.Nc3 380569315 nodes
4k3/2p2p2/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(4); 06:47; bm 1.e3 1.e4 1.d4 1.Nc3 383568904 nodes
4k3/3ppp2/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; 07:32; bm 1.e4 394314169 nodes
4k3/3p2p1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(7); 07:11; bm 1.e3 1.e4 1.d4 1.b3 1.b4 1.Nh3 1.Nc3 411883333 nodes
4k3/3p1p2/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(5); 07:50; bm 1.e3 1.e4 1.d4 1.b3 1.Nc3 424043968 nodes
4k3/4pp2/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(6); 08:34; bm 1.e3 1.e4 1.d4 1.b3 1.b4 1.Nc3 427150786 nodes
4k3/1pp2p2/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(2); 08:08; 1.e4 1.d4 446630214 nodes
4k3/3pp3/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(6); 07:54; bm 1.e3 1.e4 1.d4 1.b3 1.Na3 1.Nc3 452514368 nodes
4k3/2p2pp1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; 08:06; bm 1.e3 453284579 nodes
4k3/1p2p3/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(10); 08:19; bm 1.h4 1.e3 1.e4 1.d3 1.d4 1.b3 1.b4 1.a4 1.Na3 1.Nc3 463111148 nodes
4k3/5pp1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(5); 09:48; bm 1.e3 1.e4 1.d4 1.b3 1.b4 467123774 nodes
4k3/1p1p2p1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(4); 11:05; bm 1.e3 1.e4 1.d4 1.Nc3 508493406 nodes
4k3/3p2pp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(5); 11:43; bm 1.e3 1.e4 1.d4 1.b3 1.Nc3 523731683 nodes
4k3/1p4p1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(13); 09:33; am 1.h3 1.f3 1.f4 1.c4 1.a3 1.Nh3 1.Nf3 529173862 nodes
4k3/pp2p1p1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; 10:06; bm 1.e4 539567365 nodes
4k3/1pp3p1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(2); 10:36; bm 1.e4 1.d4 540147105 nodes
4k3/3p1p1p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(4); 10:33; bm 1.e4 1.d4 1.b3 1.Nc3 542327119 nodes
4k3/2pp3p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(2); 10:17; bm 1.e4 1.d4 544280256 nodes
4k3/1p1pp3/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; 11:23; bm 1.e4 577882868 nodes
4k3/1p2p1p1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(4); 10:32; bm 1.e3 1.e4 1.Na3 1.Nc3 577957939 nodes
4k3/1p3p1p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(4); 10:49; bm 1.e3 1.e4 1.d4 1.Nc3 580471647 nodes
4k3/2p3p1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(15); 10:13; am 1.h3 1.f3 1.f4 1.d3 1.a3 580526492 nodes
4k3/1p3pp1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(3); 11:35; bm 1.e3 1.e4 1.d4 580939945 nodes
4k3/p2p2p1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(5); 12:08; bm 1.e3 1.e4 1.d4 1.b3 1.Nc3 584331662 nodes
4k3/p3pp2/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(3); 12:22; bm 1.e3 1.e4 1.d4 587285032 nodes
4k3/2pp4/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(5); 10:13; bm 1.g3 1.e3 1.e4 1.d4 1.Nc3 596041645 nodes
4k3/3pp1p1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; 11:39; bm 1.e4 606809942 nodes
4k3/1p1p1p2/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(3); 12:31; bm 1.e4 1.d4 1.Nc3 607187811 nodes
4k3/2p2p1p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(4); 10:49; bm 1.e3 1.e4 1.d4 1.Nc3 610234093 nodes
4k3/4ppp1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; 11:47; bm 1.e3 610379804 nodes
4k3/1p1p4/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(7); 10:59; bm 1.e3 1.e4 1.d4 1.b4 1.a4 1.Na3 1.Nc3 624267773 nodes
4k3/1ppp4/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(2); 12:12; bm 1.e4 1.d4 631906180 nodes
4k3/pp2p3/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(3); 11:27; bm 1.e3 1.e4 1.d4 645107943 nodes
4k3/1pp5/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(9); 11:12; bm 1.g3 1.g4 1.e3 1.e4 1.d3 1.d4 1.a4 1.Na3 1.Nc3 648343211 nodes
4k3/p2pp3/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(4); 12:17; bm 1.e3 1.e4 1.d4 1.b3 649885576 nodes
4k3/3p3p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(14); 11:17; am 1.h3 1.g4 1.f3 1.f4 1.c3 1.a3 653387096 nodes
4k3/p1p2p2/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(3); 15:18; bm 1.e3 1.e4 1.d4 657427917 nodes
4k3/2p1p3/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(9); 11:21; bm 1.e3 1.e4 1.d4 1.b3 1.b4 1.a4 1.Nh3 1.Na3 1.Nc3 657739805 nodes
4k3/1pp1p3/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; 11:31; bm 1.e4 663096104 nodes
4k3/1p2p2p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(8); 12:16; bm 1.h4 1.e3 1.e4 1.d4 1.b4 1.a4 1.Na3 1.Nc3 665226787 nodes
4k3/3pp2p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(3); 12:53; bm 1.e3 1.e4 1.d4 669511606 nodes
4k3/4pp1p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(5); 14:01; bm 1.e3 1.e4 1.d4 1.b3 1.b4 670444406 nodes
4k3/p4pp1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(4); 12:39; bm 1.e3 1.e4 1.d4 1.b3 676491845 nodes
4k3/2p4p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(16); 11:33; am 1.h3 1.f3 1.f4 1.a3 677782692 nodes
4k3/2p3pp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(6); 12:37; bm 1.e3 1.e4 1.d4 1.b3 1.b4 1.Nc3 680998122 nodes
4k3/5ppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(5); 13:31; bm 1.e3 1.e4 1.d4 1.b3 1.b4 682341819 nodes
4k3/pp2p2p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; 13:10; bm 1.e4 710955024 nodes
4k3/pp3p2/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(4); 14:05; bm 1.e3 1.e4 1.d4 1.Nc3 712106359 nodes
4k3/4p1pp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(8); 15:17; bm 1.e3 1.e4 1.d4 1.b3 1.b4 1.Nf3 1.Na3 1.Nc3 714871494 nodes
4k3/p2p1p2/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(4); 13:23; bm 1.e3 1.e4 1.d4 1.Nc3 732385653 nodes
4k3/2p1p1p1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(2); 13:12;bm 1.e3 1.e4 734249687 nodes
2b1k3/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(2); 13:38; bm 1.e4 1.d4 742282007 nodes
4k3/1p4pp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(8); 14:27; bm 1.h4 1.e3 1.e4 1.d4 1.c3 1.b4 1.Na3 1.Nc3 768536324 nodes
4k3/p1pp4/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(2); 14:03; bm 1.e4 1.d4 780674354 nodes
4k3/pp1p1p2/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(2); 15:35; bm 1.e4 1.Nc3 785384620 nodes
4k3/pp1p4/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(4); 15:45; bm 1.e3 1.e4 1.d4 1.Nc3 822328044 nodes
4k3/p3p1p1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(8); 15:09; bm 1.e3 1.e4 1.d4 1.c3 1.b3 1.Nf3 1.Nh3 1.Nc3 822416150 nodes
4k3/1p1p3p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(4); 16:21; bm 1.e3 1.e4 1.d4 1.Nc3 827972542 nodes
4k3/2p1p2p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(4); 14:53; bm 1.e3 1.e4 1.d4 1.b3 842166529 nodes
4k3/pp1p2p1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(4); 16:30;bm 1.e3 1.e4 1.d4 1.Nc3 854584919 nodes
4k3/ppp3p1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(2); 15:58; bm 1.e4 1.d4 887122087 nodes
4k3/p4p1p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(7); 16:02; bm 1.e3 1.e4 1.d4 1.b3 1.b4 1.Nh3 1.Nc3 898181002 nodes
4k3/p1p3p1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(10); 18:41;bm 1.h4 1.g3 1.g4 1.e3 1.e4 1.d4 1.c3 1.b3 1.Nf3 1.Nc3 934633651 nodes
4k3/pppp4/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(2); 20:03; bm 1.e4 1.d4 957543458 nodes
4k3/pp4p1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(7); 18:34; bm 1.h4 1.e3 1.e4 1.d4 1.c3 1.a4 1.Nc3 1005276320 nodes
4k3/p3p2p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(13); 21:06; am 1.h3 1.g4 1.f3 1.d3 1.c3 1.a3 1.Nh3 1009378534 nodes
4k3/1pp4p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(7); 18:57; bm 1.g3 1.e3 1.e4 1.d4 1.a4 1.Na3 1.Nc3 1041272615 nodes
4k3/pp3p1p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(4); 20:15; bm 1.e3 1.e4 1.d4 1.Nc3 1049370753 nodes
4k3/p2p3p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(7); 20:26; bm 1.h4 1.e3 1.e4 1.d4 1.c4 1.b3 1.Nc3 1051088324 nodes
4k3/pp4pp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(4); 21:15; bm 1.e3 1.e4 1.d4 1.Nc3 1052750689 nodes
4k3/ppp5/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(7); 19:50; bm 1.g3 1.e3 1.e4 1.d3 1.d4 1.a4 1.Nc3 1054780915 nodes
4k3/pp1p3p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(4); 21:18; bm 1.e3 1.e4 1.d4 1.Nc3 1071675207 nodes
4k3/p1p1p3/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(6); 20:14; bm 1.e3 1.e4 1.d4 1.b3 1.b4 1.Na3 1125713108 nodes
4k3/p1p4p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(15); 24:53; am 1.h3 1.f3 1.f4 1.a3 1.Na3 1293301528 nodes
4k3/ppp4p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #8; Duals(6); 27:20; bm 1.g3 1.e3 1.e4 1.d3 1.d4 1.Nc3 1475520423 nodes
4k3/3p1pp1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #9; Duals(9); 6:25:03; bm 1.h4 1.e3 1.e4 1.d4 1.b3 1.b4 1.a4 1.Nh3 1.Nc3 19917184920 nodes
4k3/2pp1p2/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #9; Duals(12); 6:34:29; am 1.h3 1.g4 1.f3 1.f4 1.c3 1.c4 1.a3 1.Nc3 1.Nf3 20834157525 nodes
4k3/2ppp3/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #9; Duals(16); 6:40:17 am 1.g4 1.f3 1.f4 1.d3 21655345472 nodes
4k3/2p1pp2/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - bm #9; Duals(12); 6:57:05; am 1.h3 1.g4 1.f3 1.f4 1.d3 1.c4 1.a3 1.Nh3 22427378976 nodes

latest dev-McB - 1 thread, 1024 hash
[d]4kb2/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - 0 1
info depth 28 seldepth 18 multipv 1 score mate 8 nodes 11644647 nps 2737984 hashfull 62 tbhits 0 time 4253 pv e2e3 e8e7 d1g4 f8h6 f1b5 e7f7 b2b3 h6f4 e3f4 f7f6 c1b2 f6e7 g4d7 e7f8 d7g7

[d]4k1n1/8/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ -
info depth 33 seldepth 20 multipv 1 score mate 8 nodes 46754757 nps 3021113 hashfull 245 tbhits 0 time 15476 pv e2e4 g8f6 d1f3 e8e7 d2d4 e7e6 c1g5 e6e7 f3f6 e7d7 f6e7 d7c6 g5f4 c6b6 e7c7

[d]4k3/3p1pp1/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ -
info depth 28 seldepth 26 multipv 1 score mate 9 nodes 20130345 nps 2846082 hashfull 132 tbhits 0 time 7073 pv e2e3 d7d6 d1g4 e8f8 f1c4 f8e7 g4g7 d6d5 c4d5 e7d6 g7f7 d6c5 b1c3 c5b6 f7b7 b6c5 c3e4

[d]4k3/ppp4p/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ -
info depth 34 seldepth 18 multipv 1 score mate 8 nodes 103547646 nps 2935523 hashfull 563 tbhits 0 time 35274 pv e2e4 c7c6 d1h5 e8d7 d2d4 a7a6 c1f4 b7b5 h5h7 d7e8 f4d6 e8d8 h7c7 d8e8 c7e7

I tested a few others , but they took longer ( more nodes that chest) All of these were run with multipv = 1. Did not try other multipv's.