Test position bm Bxh2+

peter · Post by **peter** » Mon Apr 13, 2020 8:41 pm

MikeGL wrote: ↑Mon Apr 13, 2020 7:33 pm I don't like to open another thread and bombard the front page with test positions.
So I will just append this one here, more difficult I guess since this one requires double R sac for a mating attack on Kg1 using the light squares.

Black to play and win
[d]1k1r2r1/pppbqN2/1n1b1n1p/4p3/1P5P/PB1PP3/1BQN1PP1/2R2RK1 b - - 0 21

bm Nfd5!! (setting up a trap) if white plays Nxd8 then ... Qxh4! with a mating attack (threat Rxg2+)
I am not sure if there are other alternate mating lines than the text move.

This time a little more smp variance of new Crystal. Best trial 1", second best 6", worst 27"

Here's second best, again with 24 threads of 12x3GHz, 32G hash

1k1r2r1/pppbqN2/1n1b1n1p/4p3/1P5P/PB1PP3/1BQN1PP1/2R2RK1 b - - 0 1

Analysis by Crystal 080420 64 POPCNT:

Code: Select all

21...Rc8 22.e4 Rg7 23.Nxd6 cxd6 24.Qd1 Bh3 
  +-  (2.22)   Depth: 7/10   00:00:00  138kN
21...Bh3 22.g3 Rc8 23.Rfd1 Rg7 24.Nxd6 cxd6 25.Qb1 Qd7 26.Rxc8+ Qxc8 
  +-  (2.37)   Depth: 8/12   00:00:00  294kN
21...Rc8 22.Nf3 Bh3 23.g3 Nbd5 24.N7xe5 Nxe3 25.fxe3 Rxg3+ 26.Kh1 Bxf1 27.Rxf1 
  +-  (1.74)   Depth: 9/14   00:00:00  489kN
21...Rc8 22.Nxd6 cxd6 23.Qb1 Rg7 24.Rxc8+ Bxc8 25.f4 exf4 26.Bxf6 Qxf6 27.Rxf4 Qg6 
  +-  (2.06)   Depth: 10/20   00:00:00  666kN
21...Rc8 22.Nxd6 cxd6 23.Qd1 Rxc1 24.Qxc1 Nfd5 25.Nc4 Bh3 26.g3 Bxf1 
  +/-  (1.38)   Depth: 11/23   00:00:00  1298kN
21...Rc8 22.Nxd6 cxd6 23.Qd1 Rxc1 24.Qxc1 Nfd5 25.Ne4 Qxh4 26.Qd2 Rg7 27.f3 Ba4 28.Ba2 Qd8 
  +-  (1.71)   Depth: 12/23   00:00:00  2251kN
21...Rc8 22.Nxd6 cxd6 23.Qd1 Rxc1 24.Qxc1 Rg7 25.g3 Nfd5 26.Ne4 Qxh4 27.Qa1 Qh5 28.Nxd6 Nxe3 29.Nf5 Ng4 30.Nh4 Bb5 
  +/-  (1.55)   Depth: 13/26   00:00:00  3984kN
21...Rc8 22.Nxd6 cxd6 23.Qd1 Rxc1 24.Bxc1 Bg4 25.f3 Be6 26.Ne4 Nbd5 27.Qc2 Nxe4 28.fxe4 Nc7 29.Bxe6 Nxe6 30.Qf2 Qg7 
  +/-  (1.45)   Depth: 14/30   00:00:00  7197kN
21...Rc8 22.Nxd6 cxd6 23.Qd1 Rxc1 24.Bxc1 d5 25.Nf3 Bh3 26.Ne1 Nfd7 27.e4 Qxh4 28.Qf3 Rc8 29.Qxh3 Qxh3 30.gxh3 Rxc1 31.Nc2 Rxf1+ 32.Kxf1 dxe4 33.dxe4 Nf6 34.f3 Nh5 35.Ne3 Nf4 36.h4 
  +-  (1.74)   Depth: 15/34   00:00:01  9332kN
21...Rc8 22.Nxd6 cxd6 23.Qd1 Rxc1 24.Bxc1 d5 25.Nf3 Bh3 26.Ne1 Nfd7 27.e4 Qxh4 28.Qf3 Rc8 29.Qxh3 Qxh3 30.gxh3 Rxc1 31.Nc2 Rxf1+ 32.Kxf1 dxe4 
  +-  (1.75)   Depth: 16/34   00:00:01  9410kN
21...Nbd5 22.Nxd6 cxd6 23.g3 Qe6 24.d4 Rc8 25.Bxd5 Qxd5 26.Qb3 Qxb3 27.Nxb3 e4 28.d5 Nxd5 29.Nd2 Bf5 30.Kg2 b5 31.Bd4 Kb7 32.Rh1 Rxc1 
  +/-  (1.41)   Depth: 17/36   00:00:02  27351kN
21...Nfd5 22.Nxd8 Qg7 23.g3 Nxe3 24.Qb1 Nxf1 25.Rxf1 Rxd8 26.Ne4 Bc6 27.Rc1 Rf8 28.Rxc6 bxc6 29.Qc2 Kb7 30.Bc1 Qg6 31.Qd2 Rh8 32.Qa2 Rf8 33.Be3 Be7 34.Bc5 Bxc5 35.Nxc5+ Ka8 36.Ne6 
  +/-  (1.46)   Depth: 18/36   00:00:02  39072kN
21...Nbd5 22.Bxd5 Nxd5 23.Nxd8 Qg7 24.g3 Nxe3 25.Qb3 Nxf1 26.Rxf1 Rxd8 27.Ne4 Rf8 28.f3 Qg6 29.Qc2 Bh3 30.Rf2 Be6 31.Bc3 Bf5 32.Kh2 Qe6 33.Qd2 Bxe4 34.dxe4 
  +/-  (1.00)   Depth: 19/36   00:00:03  47269kN
21...Nbd5 22.Bxd5 
  +/-  (1.09 --)   Depth: 20/33   00:00:03  56087kN
21...Nbd5 
  +/-  (0.94 ++)   Depth: 20/46   00:00:04  64242kN
21...Nbd5 
  +/-  (0.74 ++)   Depth: 20/46   00:00:04  67613kN
21...Nbd5 
  +/=  (0.47 ++)   Depth: 20/46   00:00:04  73509kN
21...Nbd5 
  =  (0.11 ++)   Depth: 20/46   00:00:05  77027kN
21...Nfd5 
  =/+  (-0.36 ++)   Depth: 20/46   00:00:06  93247kN
21...Nfd5 
  -/+  (-0.97 ++)   Depth: 20/46   00:00:06  101MN
21...Nfd5 
  -+  (-1.76 ++)   Depth: 20/46   00:00:07  112MN
21...Nfd5 22.Nxd8 Qxh4 23.Nf3 Rxg2+ 24.Kxg2 Qg4+ 25.Kh2 Qxf3 26.Nf7 Qxf7 27.Rh1 Qg6 28.e4 Qh5+ 29.Kg1 Qg4+ 30.Kf1 Qf3 31.Bxd5 Qxh1+ 32.Ke2 Qg2 33.Ke3 Bg4 34.Kd2 Nxd5 35.exd5 Qf3 36.Qc4 Qxf2+ 37.Kc3 Bf3 38.a4 Qg2 39.Qh4 
  -/+  (-1.06)   Depth: 20/54   00:00:08  130MN
21...Nfd5 22.Nxd8 
  -/+  (-0.96 --)   Depth: 21/49   00:00:08  139MN
21...Nfd5 22.Nxd8 
  -/+  (-0.86 --)   Depth: 21/49   00:00:08  140MN
21...Nfd5 
  -/+  (-0.96 ++)   Depth: 21/52   00:00:08  141MN
21...Nfd5 
  -/+  (-1.16 ++)   Depth: 21/53   00:00:09  143MN
21...Nfd5 22.Nxd8 Qxh4 23.Bxd5 Nxd5 24.Nf3 Rxg2+ 25.Kxg2 Qg4+ 26.Kh2 Qxf3 27.Nf7 Qxf7 28.Rh1 Qg6 29.e4 Qh5+ 30.Kg1 Qg4+ 31.Kf1 Qf3 32.exd5 Qxh1+ 33.Ke2 Bg4+ 34.Kd2 Qf3 35.Qc4 Qxf2+ 36.Kc3 h5 37.Kb3 Bf3 38.Qb5 a6 39.Qc4 Qg2 
  -/+  (-1.19)   Depth: 21/53   00:00:09  144MN
21...Nfd5 22.Nxd8 Qxh4 23.Bxd5 Nxd5 24.Nf3 Rxg2+ 25.Kxg2 Qg4+ 26.Kh2 Qxf3 27.Nf7 Qxf7 28.Rh1 Qg6 29.e4 Qh5+ 30.Kg1 Qg4+ 31.Kf1 Qf3 32.exd5 Qxh1+ 33.Ke2 Bg4+ 34.Kd2 Qf3 35.Qc4 Qxf2+ 36.Kc3 h5 37.Kb3 Bf3 38.Qb5 a6 39.Qe8+ Ka7 40.Bxe5 Qe3 
  -/+  (-1.21)   Depth: 22/39   00:00:09  149MN
21...Nfd5 22.Nxd8 
  -/+  (-1.11 --)   Depth: 23/50   00:00:10  160MN
21...Nfd5 
  -/+  (-1.21 ++)   Depth: 23/52   00:00:10  162MN
21...Nfd5 
  -/+  (-1.36 ++)   Depth: 23/60   00:00:10  167MN
21...Nfd5 
  -/+  (-1.56 ++)   Depth: 23/60   00:00:11  182MN
21...Nfd5 22.Nxd8 Qxh4 23.Nf3 Rxg2+ 24.Kxg2 Qg4+ 25.Kh2 Qxf3 26.Nf7 Qxf7 27.Rh1 Qg6 28.e4 Qh5+ 29.Kg1 Qg4+ 30.Kf1 Qf3 31.Bxd5 Nxd5 32.exd5 Qxh1+ 33.Ke2 Bg4+ 34.Kd2 Qf3 35.Qc4 Qxf2+ 36.Kc3 h5 37.Qb5 h4 38.Rc2 Qg3 39.Qe8+ Bc8 40.Rd2 h3 41.Kc2 h2 
  -/+  (-1.34)   Depth: 23/60   00:00:11  184MN
21...Nfd5 
  -/+  (-1.44 ++)   Depth: 24/53   00:00:12  193MN
21...Nfd5 22.Nxd8 
  -/+  (-1.24 --)   Depth: 24/57   00:00:12  201MN
21...Nfd5 22.Nxd8 
  -/+  (-1.09 --)   Depth: 24/57   00:00:13  209MN
21...Nfd5 22.Nxd8 
  -/+  (-0.89 --)   Depth: 24/57   00:00:14  234MN
21...Nfd5 
  -/+  (-1.07 ++)   Depth: 24/64   00:00:15  246MN
21...Nfd5 22.Nxd8 Qxh4 23.Nf3 Rxg2+ 24.Kxg2 Qg4+ 25.Kh2 Qxf3 26.Nf7 Qxf7 27.f3 Qh5+ 28.Kg1 e4 29.Bxd5 Nxd5 30.fxe4 Nxe3 31.Rf8+ Bc8 32.Qd2 Qg5+ 33.Kf2 Ng4+ 34.Ke2 Qxd2+ 35.Kxd2 Bxf8 36.Rf1 Bd6 37.Rf7 b6 38.d4 Bg3 39.Rf3 Bh4 40.d5 
  -/+  (-1.09)   Depth: 24/64   00:00:15  247MN
21...Nfd5 
  -/+  (-1.19 ++)   Depth: 25/54   00:00:16  258MN
21...Nfd5 
  -/+  (-1.29 ++)   Depth: 25/54   00:00:16  260MN
21...Nfd5 
  -/+  (-1.43 ++)   Depth: 25/54   00:00:16  266MN
21...Nfd5 22.Nxd8 Qxh4 23.Nf3 Rxg2+ 24.Kxg2 Qh3+ 25.Kg1 Qg4+ 26.Kh2 Qxf3 27.Nf7 Qxf7 28.f3 Qh5+ 29.Kg1 e4 30.Bxd5 Nxd5 31.Qg2 Nxe3 32.Qg8+ Bc8 33.Rf2 exf3 34.Re1 Ng4 35.Re8 Bh2+ 36.Kf1 Qh3+ 37.Ke1 Nxf2 38.Kxf2 Bd6 39.Bd4 b6 40.Ke3 Qf5 41.Kf2 Kb7 42.Rxc8 Qxc8 43.Qd5+ Kb8 44.Qxf3 
  -/+  (-1.24)   Depth: 25/54   00:00:16  267MN
21...Nfd5 22.Nxd8 
  -/+  (-1.14 --)   Depth: 26/64   00:00:18  305MN
21...Nfd5 22.Nxd8 
  -/+  (-1.04 --)   Depth: 26/64   00:00:20  324MN
21...Nfd5 22.Nxd8 
  -/+  (-0.90 --)   Depth: 26/64   00:00:22  364MN
21...Nfd5 22.Nxd8 
  =/+  (-0.69 --)   Depth: 26/64   00:00:25  411MN
21...Nfd5 
  -/+  (-1.03 ++)   Depth: 26/64   00:00:25  411MN
21...Nfd5 
  -/+  (-1.39 ++)   Depth: 26/64   00:00:25  417MN
21...Nfd5 22.Nxd8 Qxh4 23.Nf3 Rxg2+ 24.Kxg2 Qg4+ 25.Kh2 Qxf3 26.Nf7 Qxf7 27.f3 Qh5+ 28.Kg1 Nxe3 29.Qd2 e4 30.Rf2 Bf4 31.fxe4 Qg4+ 32.Rg2 Nxg2 33.Qxg2 Be3+ 34.Kh1 Qh5+ 35.Qh2 Bh3 36.Rf1 Bg2+ 37.Kxg2 Qe2+ 38.Kh3 Qxf1+ 39.Qg2 Qxd3 40.Qg8+ Nc8 41.Bc4 Qxe4 42.Be6 Qh1+ 43.Kg3 Qg1+ 44.Kf3 Qxg8 45.Bxg8 Bg5 46.a4 Ne7 47.Bc4 b6 48.a5 Kb7 49.axb6 axb6 50.b5 
  -/+  (-0.80)   Depth: 26/64   00:00:30  487MN
21...Nfd5 
  -/+  (-0.90 ++)   Depth: 27/37   00:00:30  487MN
21...Nfd5 
  -/+  (-1.00 ++)   Depth: 27/37   00:00:30  487MN
21...Nfd5 
  -/+  (-1.15 ++)   Depth: 27/37   00:00:30  488MN
21...Nfd5 
  -/+  (-1.35 ++)   Depth: 27/44   00:00:30  489MN
21...Nfd5 
  -+  (-1.62 ++)   Depth: 27/50   00:00:31  510MN
21...Nfd5 22.Nxd8 Qxh4 23.g3 Rxg3+ 24.fxg3 Qxg3+ 25.Kh1 Qh3+ 26.Kg1 Nxe3 27.Ne4 Nxc2 28.Rxc2 Qxd3 29.Nxd6 Qxb3 30.Rf8 Qg3+ 31.Kh1 cxd6 32.Nc6+ Kc7 33.Nxe5+ Bc6+ 34.Nxc6 bxc6 35.Rf7+ Nd7 36.Rg2 Qh3+ 37.Kg1 Kb6 38.Rgg7 Qe3+ 39.Kh2 Qe2+ 40.Kh1 Kb5 41.Rxd7 Qxb2 42.Rxa7 Qe2 43.Rgc7 Qf3+ 44.Kg1 h5 45.Rf7 Qe3+ 46.Kg2 h4 47.Rh7 Qg3+ 48.Kf1 h3 
  -+  (-1.61)   Depth: 27/74   00:00:36  593MN
21...Nfd5 
  -+  (-1.71 ++)   Depth: 28/58   00:00:38  626MN
21...Nfd5 
  -+  (-1.81 ++)   Depth: 28/86   00:00:47  767MN
21...Nfd5 
  -+  (-1.96 ++)   Depth: 28/86   00:00:52  852MN
21...Nfd5 22.Nxd8 
  -/+  (-1.52 --)   Depth: 28/86   00:00:52  855MN
21...Nfd5 
  -+  (-1.84 ++)   Depth: 28/86   00:00:52  857MN
21...Nfd5 22.Nxd8 Qxh4 23.Nf3 Rxg2+ 24.Kxg2 Qg4+ 25.Kh2 Qxf3 26.Nf7 Qxf7 27.Rh1 Qg6 28.e4 Qh5+ 29.Kg1 Qg4+ 30.Kf1 Qf3 31.Bxd5 Nxd5 32.exd5 Qxh1+ 33.Ke2 Bg4+ 34.Kd2 Qf3 35.Qa4 a6 36.Kc2 h5 37.Bc3 Qe2+ 38.Kb1 Qxd3+ 39.Kb2 Bf3 40.Rg1 Bxd5 41.Rd1 Qc4 42.Rxd5 Qxd5 43.Qe8+ Ka7 44.Qxh5 
  -/+  (-1.48)   Depth: 28/86   00:00:52  857MN
21...Nfd5 
  -/+  (-1.58 ++)   Depth: 29/63   00:00:56  914MN
21...Nfd5 
  -+  (-1.68 ++)   Depth: 29/63   00:00:56  915MN
21...Nfd5 
  -+  (-1.83 ++)   Depth: 29/63   00:00:58  950MN
21...Nfd5 22.Nxd8 Qxh4 23.Nf3 Rxg2+ 24.Kxg2 Qg4+ 25.Kh2 Qxf3 26.Nf7 Qxf7 27.Rh1 Qg6 28.e4 Qh5+ 29.Kg1 Qg4+ 30.Kf1 Qf3 31.Bxd5 Nxd5 32.exd5 Qxh1+ 33.Ke2 Bg4+ 34.Kd2 Qf3 35.Qc4 Qxf2+ 36.Kc3 h5 37.a4 Bf3 38.a5 h4 39.a6 bxa6 40.b5 a5 41.Qc6 Qd4+ 42.Kc2 Qxd5 43.Qxd5 Bxd5 44.Re1 h3 45.Bxe5 Kb7 46.Bxd6 cxd6 
  -+  (-2.02)   Depth: 29/63   00:01:02  1009MN
21...Nfd5 22.Nxd8 
  -+  (-1.92 --)   Depth: 30/56   00:01:04  1039MN
21...Nfd5 22.Nxd8 
  -+  (-1.83 --)   Depth: 30/76   00:01:06  1068MN
21...Nfd5 22.Nxd8 
  -+  (-1.68 --)   Depth: 30/76   00:01:07  1096MN
21...Nfd5 
  -+  (-1.80 ++)   Depth: 30/76   00:01:08  1100MN
21...Nfd5 22.Nxd8 Qxh4 23.Nf3 Rxg2+ 24.Kxg2 Qh3+ 25.Kg1 Qg4+ 26.Kh2 Qxf3 27.Nf7 Qxf7 28.Rh1 Qg6 29.e4 Qh5+ 30.Kg1 Qg4+ 31.Kf1 Qf3 32.Bxd5 Nxd5 33.exd5 Qxh1+ 34.Ke2 Bg4+ 35.Kd2 Qf3 36.Qc4 Qxf2+ 37.Kc3 h5 38.Rc2 Qe1+ 39.Rd2 Bf3 40.Kc2 a6 41.Bc3 e4 42.Kb2 e3 43.Rc2 Qg3 44.Qd4 Bd1 45.Rc1 e2 46.Qe4 b6 47.Qe8+ Ka7 48.d4 Qg5 
  -+  (-1.89)   Depth: 30/76   00:01:10  1145MN
21...Nfd5 
  -+  (-1.99 ++)   Depth: 31/76   00:01:19  1277MN
21...Nfd5 22.Nxd8 Qxh4 23.Nf3 Rxg2+ 24.Kxg2 Qg4+ 25.Kh2 Qxf3 26.Nf7 Qxf7 27.Rh1 Qg6 28.e4 Qh5+ 29.Kg1 Qg4+ 30.Kf1 Qf3 31.Bxd5 Nxd5 32.exd5 Qxh1+ 33.Ke2 Bg4+ 34.Kd2 Qf3 35.Qa4 a6 36.Kc2 h5 37.Bc3 h4 38.Kb2 h3 39.b5 axb5 40.Qxb5 h2 41.Bb4 h1Q 42.Rxh1 Qxh1 43.Bxd6 cxd6 44.Qb4 Qf3 45.Qxd6+ Kc8 46.Qxe5 Qxf2+ 47.Kc3 Qc5+ 48.Kb3 Bd1+ 49.Kb2 Qc2+ 50.Ka1 Qxd3 51.Qh8+ Kd7 52.Qg7+ Kd6 53.Qxb7 Qxa3+ 54.Kb1 
  -+  (-2.00)   Depth: 31/76   00:01:37  1581MN
21...Nfd5 22.Nxd8 
  -+  (-1.91 --)   Depth: 32/66   00:01:48  1755MN
21...Nfd5 22.Nxd8 
  -+  (-1.81 --)   Depth: 32/66   00:02:05  2025MN
21...Nfd5 
  -+  (-1.91 ++)   Depth: 32/88   00:02:15  2202MN
21...Nfd5 22.Nxd8 
  -+  (-1.66 --)   Depth: 32/88   00:02:28  2407MN
21...Nfd5 22.Nxd8 
  -/+  (-1.39 --)   Depth: 32/88   00:02:57  2904MN
21...Nfd5 22.Nxd8 
  -/+  (-1.03 --)   Depth: 32/88   00:03:41  3635MN
21...Nfd5 
  -/+  (-1.33 ++)   Depth: 32/88   00:03:42  3651MN
21...Nfd5 22.Nxd8 Qxh4 23.Nf3 Rxg2+ 24.Kxg2 Qh3+ 25.Kg1 Qg4+ 26.Kh2 Qxf3 27.Nf7 Qxf7 28.Rh1 Qg6 29.e4 Qh5+ 30.Kg1 Qg4+ 31.Kf1 Qf3 32.Bxd5 Nxd5 33.exd5 Qxh1+ 34.Ke2 Bg4+ 35.Kd2 Qf3 36.Qc4 a6 37.b5 a5 38.Kc3 Bf5 39.Rg1 h5 40.Rg8+ Ka7 41.Rh8 Qd1 42.Rh6 a4 43.f4 Bxd3 44.Qxd3 Qb3+ 45.Kd2 Qxb2+ 46.Ke3 exf4+ 47.Ke4 Kb6 48.Qd4+ Qxd4+ 49.Kxd4 Ka5 50.Ke4 f3 51.b6 Kxb6 52.Ke3 h4 53.Kxf3 
  -/+  (-1.32)   Depth: 32/88   00:03:42  3652MN
21...Nfd5 
  -/+  (-1.42 ++)   Depth: 33/76   00:03:52  3815MN
21...Nfd5 
  -/+  (-1.52 ++)   Depth: 33/76   00:03:54  3848MN

Edit: SF dev. took 19, 27 and 60 seconds in three trials.

mmt · Post by **mmt** » Tue Apr 14, 2020 3:11 am

MikeGL wrote: ↑Mon Apr 13, 2020 7:33 pm [d]1k1r2r1/pppbqN2/1n1b1n1p/4p3/1P5P/PB1PP3/1BQN1PP1/2R2RK1 b - - 0 21

LC0 sees the right move instantly but it gets to only +1.25 in one minute. +1.54 after 10 minutes.

MikeGL · Post by **MikeGL** » Tue Apr 14, 2020 6:14 am

mmt wrote: ↑Tue Apr 14, 2020 3:11 am
MikeGL wrote: ↑Mon Apr 13, 2020 7:33 pm [d]1k1r2r1/pppbqN2/1n1b1n1p/4p3/1P5P/PB1PP3/1BQN1PP1/2R2RK1 b - - 0 21
LC0 sees the right move instantly but it gets to only +1.25 in one minute. +1.54 after 10 minutes.

This is SF-Lc0 game. Haven't seen SF being demolished so quickly and so brutally like this before.
This looks more difficult than most of Nolot test positions.
White is up by two rooks but mate is unavoidable.

[pgn]
[Site "?"]
[Date "2020.03.24"]
[Round "70"]
[White "Stockfish 191210 bmi2"]
[Black "Lc0 0.24.1 J64-180"]
[Result "0-1"]
[TimeControl "480+5"]
[Termination "normal"]
[PlyCount "60"]
[WhiteType "human"]
[BlackType "human"]

1. Na3 {book} Nh6 {book} 2. Rb1 {book} Rg8 {book} 3. Ra1 {book} Rh8 {book}
4. Nb1 {book} Ng8 {book} 5. b4 {book} e5 {book} 6. a3 {book} d5 {book} 7.
Bb2 {book} Bd6 {book} 8. Nf3 {book} Qe7 {book} 9. c4 dxc4 {7.9s} 10. e3
{5.0s} Nf6 11. Bxc4 {7.0s} Bg4 {6.2s} 12. d3 Nbd7 13. Nbd2 O-O-O 14. Qc2
Nb6 15. h3 {63s} Bd7 16. Bb3 Kb8 17. Rc1 Rhe8 18. O-O g5 19. Nxg5 Rg8 20.
h4 {7.0s} h6 21. Nxf7 {7.7s} Nfd5 22. Nxd8 {7.8s} Qxh4 {9.0s} 23. Ne4
{7.7s} Rxg2+ 24. Kxg2 Bh3+ 25. Kh2 Bg4+ 26. Kg1 {6.1s} Bf3 27. Ng3 {0.15s}
Qh3 28. Qxc7+ {0.021s} Bxc7 29. Nc6+ {0.015s} bxc6 30. a4 {0.011s} Qg2#
{21s, Black mates} 0-1
[/pgn]

Dann Corbit · Post by **Dann Corbit** » Tue Apr 14, 2020 9:11 am

Astonishing beauty, in a sea of foamy questions, the very definition of elegance, yet...
Someone will say, "Imperfection, brutal in-congruence, fatal flawed unintelligence.

More of this, for my soul, because it craves rare beauty like this

Vinvin · Post by **Vinvin** » Sun Jan 17, 2021 6:10 pm

MikeGL wrote: ↑Mon Apr 13, 2020 7:33 pm I don't like to open another thread and bombard the front page with test positions.
So I will just append this one here, more difficult I guess since this one requires double R sac for a mating attack on Kg1 using the light squares.

Black to play and win
[d]1k1r2r1/pppbqN2/1n1b1n1p/4p3/1P5P/PB1PP3/1BQN1PP1/2R2RK1 b - - 0 21

bm Nfd5!! (setting up a trap) if white plays Nxd8 then ... Qxh4! with a mating attack (threat Rxg2+)
I am not sure if there are other alternate mating lines than the text move.

3 runs on my old i7-6*4 GHz with Bluefish-12-W : 1m40s, 35s and 1m55 (average 1m23s)

Code: Select all

Bluefish-12-W-x86-64-modern:
Found 511 tablebases
NNUE evaluation using nn-62ef826d1a6d.nnue enabled
...
 36/34	01:40	 603 333 716	6 033 095	 0,00	21. ... Nbd5 22.Nxd8 Rxg2+ 23.Kxg2 Qg7+ 24.Kh1 Qg4 25.Bxd5 Qh3+ 26.Kg1 Ng4 27.Nf3 e4 28.Be5 Bxe5 29.Bxe4 Bh2+ 30.Kh1 Bf5 31.Nc6+ bxc6 32.Qc4 Be5+ 33.Kg1 Bxe4 34.Qxe4 Bh2+ 35.Kh1 Bd6+ 36.Kg1
 37/34-	01:40	 606 444 025	6 028 989	-0,06	21. ... Nfd5
 37/34-	01:41	 614 022 842	6 029 230	-0,12	21. ... Nfd5
 37/34-	01:49	 655 451 177	6 011 217	-0,20	21. ... Nfd5
 36/34	01:50	 661 208 349	6 010 766	-0,20	21. ... Nfd5
 37/34-	01:50	 665 702 700	6 012 325	-0,32	21. ... Nfd5
 37/34-	01:52	 678 423 092	6 010 020	-0,48	21. ... Nfd5
 37/34-	01:57	 705 198 161	6 015 252	-1,00	21. ... Nfd5
 36/34	02:00	 722 317 382	6 019 110	-1,00	21. ... Nfd5
 37/48	02:02	 739 210 496	6 024 142	-0,88	21. ... Nfd5 22.Nxd8 Qxh4 23.Nf3 Rxg2+ 24.Kxg2 Qh3+ 25.Kg1 Qg4+ 26.Kh2 Qxf3 27.Nf7 Qxf7 28.Rh1 Qg6 29.e4 Qh5+ 30.Kg1 Qg4+ 31.Kf1 Qf3 32.Bxd5 Qxh1+ 33.Ke2 Qg2 34.Kd2 h5 35.Qd1 Nxd5 36.exd5 e4 37.Qxh5 Qxf2+ 38.Kc3 exd3 39.Qh8+ Bc8 40.Kxd3 Qf3+ 41.Kc4 Qe3 42.Qd4
 38/37-	02:13	 808 686 327	6 060 480	-0,95	21. ... Nfd5
 38/45-	02:26	 891 175 405	6 084 686	-1,02	21. ... Nfd5
 38/70-	02:46	1 009 305 890	6 073 716	-1,26	21. ... Nfd5
 38/70	02:57	1 081 921 295	6 104 892	-1,34	21. ... Nfd5 22.Nxd8 Qxh4 23.Nf3 Rxg2+ 24.Kxg2 Qg4+ 25.Kh2 Qxf3 26.Nf7 Qxf7 27.Rh1 Qg6 28.e4 Qh5+ 29.Kg1 Qg4+ 30.Kf1 Qf3 31.Bxd5 Nxd5 32.exd5 Qxh1+ 33.Ke2 Bg4+ 34.Kd2 Qf3 35.Qc4 Qxf2+ 36.Kc3 h5 37.Kb3 Qg2 38.Ka2 a6 39.Ka1 h4 40.Qe4 h3 41.Qxg2 hxg2 42.Bc3 Bf3 43.Kb2 Bxd5 44.Rg1 Bf3 45.Kc1 e4 46.dxe4 Bh2 47.Bd4 Bxg1
 38/70	03:00	1 098 895 928	6 104 807	-1,34	21. ... Nfd5 22.Nxd8 Qxh4 23.Nf3 Rxg2+ 24.Kxg2 Qg4+ 25.Kh2 Qxf3 26.Nf7 Qxf7 27.Rh1 Qg6 28.e4 Qh5+ 29.Kg1 Qg4+ 30.Kf1 Qf3 31.Bxd5 Nxd5 32.exd5 Qxh1+ 33.Ke2 Bg4+ 34.Kd2 Qf3 35.Qc4 Qxf2+ 36.Kc3 h5 37.Kb3 Qg2 38.Ka2 a6 39.Ka1 h4 40.Qe4 h3 41.Qxg2 hxg2 42.Bc3 Bf3 43.Kb2 Bxd5 44.Rg1 Bf3 45.Kc1 e4 46.dxe4 Bh2 47.Bd4 Bxg1
 39/56-	03:36	1 322 209 780	6 113 869	-1,41	21. ... Nfd5
 39/64+	03:45	1 381 984 253	6 125 355	-1,26	21. ... Nfd5 22.Nxd8
 39/64-	03:53	1 438 901 446	6 153 279	-1,37	21. ... Nfd5
 38/64	04:00	1 481 032 318	6 170 839	-1,37	21. ... Nfd5
 39/64+	04:05	1 519 717 164	6 198 449	-1,15	21. ... Nfd5 22.Nxd8
 39/69	04:33	1 712 685 104	6 253 505	-1,28	21. ... Nfd5 22.Nxd8 Qxh4 23.Nf3 Rxg2+ 24.Kxg2 Qg4+ 25.Kh2 Qxf3 26.Nf7 Qxf7 27.f3 Qh5+ 28.Kg1 Nxe3 29.Qd2 e4 30.Rf2 Bf4 31.fxe4 Qg4+ 32.Rg2 Nxg2 33.Qxg2 Qh5 34.Re1 Bh3 35.Qf2 Qg5+ 36.Kh1 Bg2+ 37.Qxg2 Qh4+ 38.Kg1 Qxe1+ 39.Qf1 Be3+ 40.Kg2 Qd2+ 41.Kh3 Bf4 42.Qg2 Qxd3+ 43.Kg4 Qxb3 44.Kxf4 Qf7+ 45.Kg3 Nc4 46.Qe2 Nd6 47.e5 Nf5+ 48.Kh2 Ng7 49.Kg3 h5 50.Qe4 a6 51.Bd4 Qf5 52.Qf3 Qxf3+ 53.Kxf3
 39/69	05:00	1 896 424 978	6 321 290	-1,28	21. ... Nfd5 22.Nxd8 Qxh4 23.Nf3 Rxg2+ 24.Kxg2 Qg4+ 25.Kh2 Qxf3 26.Nf7 Qxf7 27.f3 Qh5+ 28.Kg1 Nxe3 29.Qd2 e4 30.Rf2 Bf4 31.fxe4 Qg4+ 32.Rg2 Nxg2 33.Qxg2 Qh5 34.Re1 Bh3 35.Qf2 Qg5+ 36.Kh1 Bg2+ 37.Qxg2 Qh4+ 38.Kg1 Qxe1+ 39.Qf1 Be3+ 40.Kg2 Qd2+ 41.Kh3 Bf4 42.Qg2 Qxd3+ 43.Kg4 Qxb3 44.Kxf4 Qf7+ 45.Kg3 Nc4 46.Qe2 Nd6 47.e5 Nf5+ 48.Kh2 Ng7 49.Kg3 h5 50.Qe4 a6 51.Bd4 Qf5 52.Qf3 Qxf3+ 53.Kxf3
 40/42+	05:15	2 012 895 691	6 384 247	-1,20	21. ... Nfd5 22.Nxd8
 40/49+	05:36	2 153 156 740	6 395 337	-1,12	21. ... Nfd5 22.Nxd8
 40/65-	05:51	2 244 467 469	6 380 170	-1,20	21. ... Nfd5
 39/65	06:00	2 295 384 994	6 375 963	-1,20	21. ... Nfd5
 40/65-	06:06	2 332 072 823	6 371 661	-1,35	21. ... Nfd5
 40/65	06:23	2 446 373 071	6 372 323	-1,37	21. ... Nfd5 22.Nxd8 Qxh4 23.Nf3 Rxg2+ 24.Kxg2 Qg4+ 25.Kh2 Qxf3 26.Nf7 Qxf7 27.f3 Qh5+ 28.Kg1 Nxe3 29.Qd2 e4 30.Rf2 Bf4 31.fxe4 Qg4+ 32.Rg2 Nxg2 33.Qxg2 Qh5 34.Re1 Bh3 35.Qf2 Qg5+ 36.Kh1 Bg2+ 37.Qxg2 Qh4+ 38.Kg1 Qxe1+ 39.Qf1 Be3+ 40.Kg2 Qd2+ 41.Kh3 Bf4 42.Qg2 Qxd3+ 43.Kg4 Bd6 44.Be6 a6 45.Kh5 Na4 46.Bf6 Qxa3 47.e5 Bxb4 48.Kxh6 Qe3+ 49.Kg6 Nb6 50.Qh3 Qc5 51.Qg4 a5

Code: Select all

Bluefish-12-W-x86-64-modern:
Found 511 tablebases
NNUE evaluation using nn-62ef826d1a6d.nnue enabled
...
 28/43+	00:26	 149 484 064	5 734 389	+0,36	21. ... Rxg2+ 22.Kxg2
 28/43-	00:28	 164 779 917	5 771 827	+0,30	21. ... Nbd5
 28/43-	00:28	 165 591 770	5 776 994	+0,09	21. ... Nbd5
 28/43	00:29	 169 945 235	5 796 222	 0,00	21. ... Nbd5 22.Nxd8 Rxg2+ 23.Kxg2 Qg7+ 24.Kh1 Qg4 25.Bxd5 Qh3+ 26.Kg1 Ng4 27.Bxe5 Bxe5 28.Nf3 Bh2+ 29.Kh1 Be5+
 29/13	00:31	 185 964 620	5 868 057	 0,00	21. ... Nbd5 22.Nxd8 Rxg2+ 23.Kxg2 Qg7+ 24.Kh1 Qg4 25.Bxd5 Qxh4+ 26.Kg1 Qg5+ 27.Kh1
 29/17	00:34	 202 017 379	5 876 185	 0,00	21. ... Nbd5 22.Nxd8 Rxg2+ 23.Kxg2 Qg7+ 24.Kh1 Qg4 25.Bxd5 Qh3+ 26.Kg1 e4 27.f4 Qg3+ 28.Kh1 Qh3+ 29.Kg1
 30/17-	00:35	 209 764 310	5 874 763	-0,06	21. ... Nfd5
 30/17-	00:36	 212 058 529	5 878 268	-0,12	21. ... Nfd5
 30/17-	00:37	 222 071 065	5 900 966	-1,37	21. ... Nfd5
 30/40	00:38	 227 918 437	5 928 891	-1,15	21. ... Nfd5 22.Nxd8 Qxh4 23.Nf3 Rxg2+ 24.Kxg2 Qg4+ 25.Kh2 Qxf3 26.Nf7 Qxf7 27.Rh1 Qg6 28.e4 Qh5+ 29.Kg1 Qg4+ 30.Kf1 Qf3 31.Bxd5 Qxh1+ 32.Ke2 Bg4+ 33.Kd2 Qf3 34.Bb3 Qg2 35.Kc3 h5 36.f3 Qxf3 37.Qh2 Qe3 38.Rg1
 30/40	00:44	 267 519 486	6 027 928	-1,15	21. ... Nfd5 22.Nxd8 Qxh4 23.Nf3 Rxg2+ 24.Kxg2 Qg4+ 25.Kh2 Qxf3 26.Nf7 Qxf7 27.Rh1 Qg6 28.e4 Qh5+ 29.Kg1 Qg4+ 30.Kf1 Qf3 31.Bxd5 Qxh1+ 32.Ke2 Bg4+ 33.Kd2 Qf3 34.Bb3 Qg2 35.Kc3 h5 36.f3 Qxf3 37.Qh2 Qe3 38.Rg1
 31/48-	00:44	 267 988 254	6 028 982	-1,22	21. ... Nfd5
 31/51+	00:46	 280 240 185	6 052 703	-1,07	21. ... Nfd5 22.Nxd8
 31/56-	00:49	 298 722 562	6 090 164	-1,18	21. ... Nfd5
 30/56	00:54	 337 285 192	6 202 261	-1,18	21. ... Nfd5
 31/56-	00:57	 359 171 002	6 242 326	-1,33	21. ... Nfd5
 31/56+	00:58	 363 295 299	6 253 361	-0,97	21. ... Nfd5 22.Nxd8
 30/56	01:04	 406 267 885	6 310 271	-0,97	21. ... Nfd5 22.Nxd8
 31/56+	01:05	 415 561 052	6 322 916	-0,71	21. ... Nfd5 22.Nxd8
 30/56	01:14	 477 748 794	6 422 908	-0,71	21. ... Nfd5 22.Nxd8
 31/63	01:18	 511 947 551	6 495 147	-0,72	21. ... Nfd5 22.Nxd8 Qxh4 23.Nf3 Rxg2+ 24.Kxg2 Qh3+ 25.Kg1 Qg4+ 26.Kh2 Qxf3 27.Nf7 Qxf7 28.f3 Qh5+ 29.Kg1 e4 30.Bxd5 Nxd5 31.Qg2 Nxe3 32.Qg8+ Bc8 33.Rf2 exf3 34.Re1 Ng2 35.Rxg2 fxg2 36.Qxg2 b6 37.Re3 a5 38.bxa5 Bb7 39.Qe2 Qg5+ 40.Kf1 Qf5+ 41.Ke1 Qxa5+ 42.Kf1 Qf5+ 43.Ke1 Qg5 44.Kd1 Qb5 45.Kc2
 31/63	01:24	 550 193 225	6 520 267	-0,72	21. ... Nfd5 22.Nxd8 Qxh4 23.Nf3 Rxg2+ 24.Kxg2 Qh3+ 25.Kg1 Qg4+ 26.Kh2 Qxf3 27.Nf7 Qxf7 28.f3 Qh5+ 29.Kg1 e4 30.Bxd5 Nxd5 31.Qg2 Nxe3 32.Qg8+ Bc8 33.Rf2 exf3 34.Re1 Ng2 35.Rxg2 fxg2 36.Qxg2 b6 37.Re3 a5 38.bxa5 Bb7 39.Qe2 Qg5+ 40.Kf1 Qf5+ 41.Ke1 Qxa5+ 42.Kf1 Qf5+ 43.Ke1 Qg5 44.Kd1 Qb5 45.Kc2
 32/51-	01:27	 571 886 367	6 545 793	-0,79	21. ... Nfd5
 32/51	01:29	 585 614 266	6 572 255	-0,71	21. ... Nfd5 22.Nxd8 Qxh4 23.Nf3 Rxg2+ 24.Kxg2 Qg4+ 25.Kh2 Qxf3 26.Nf7 Qxf7 27.f3 e4+ 28.Kg1 Qh5 29.Bxd5 Nxd5 30.Qg2 Nxe3 31.Qg8+ Bc8 32.Rf2 exf3 33.Re1 Ng2 34.Rxg2 fxg2 35.Qxg2 a6 36.Re3 b6 37.Kf2 a5 38.Bc3 axb4 39.Bxb4 Bf4 40.Re4 Qh4+ 41.Kf1 Bb7 42.Be1 Qd8
 33/58-	01:31	 603 796 388	6 570 217	-0,77	21. ... Nfd5
 32/58	01:34	 620 902 387	6 578 540	-0,77	21. ... Nfd5
 33/63	01:37	 645 180 090	6 587 234	-0,75	21. ... Nfd5 22.Nxd8 Qxh4 23.Nf3 Rxg2+ 24.Kxg2 Qh3+ 25.Kg1 Qg4+ 26.Kh2 Qxf3 27.Nf7 Qxf7 28.f3 Qh5+ 29.Kg1 e4 30.Bxd5 Nxd5 31.Qg2 Nxe3 32.Qg8+ Bc8 33.Rf2 exf3 34.Re1 Ng2 35.Rxg2 fxg2 36.Qxg2 a6 37.Re3 b6 38.Kf2 Ka7 39.Qf3 Qh2+ 40.Qg2 Qh4+ 41.Ke2 Bf4 42.Bd4 Bxe3 43.Bxe3 Bb7 44.Qf2 Qh5+ 45.Kd2
 33/66	01:44	 690 009 734	6 610 301	-0,69	21. ... Nfd5 22.Nxd8
 34/66+	01:44	 693 218 418	6 610 264	-0,69	21. ... Nfd5 22.Nxd8
 34/66-	01:48	 716 711 628	6 608 926	-0,75	21. ... Nfd5
 34/66-	01:50	 732 339 559	6 610 577	-0,85	21. ... Nfd5
 34/66	01:52	 746 099 986	6 625 698	-0,81	21. ... Nfd5 22.Nxd8 Qxh4 23.Nf3 Rxg2+ 24.Kxg2 Qg4+ 25.Kh2 Qxf3 26.Nf7 Qxf7 27.f3 e4+ 28.Kg1 Qh5 29.Bxd5 Nxd5 30.Qg2 Nxe3 31.Qg8+ Bc8 32.Rf2 exf3 33.Re1 Ng2 34.Rxg2 fxg2 35.Qxg2 b6 36.Re3 a5 37.bxa5 Qxa5 38.Re8 Qc5+ 39.Qf2 Qb5 40.Qe2 Qd7 41.Kf1 Ka7 42.Ke1 Bb7 43.Re3 Bf4 44.Be5 Bg5 45.Qf2 Qc6 46.Rg3 h5 47.Rxg5 Qc1+ 48.Ke2 Qxg5
 34/66	01:54	 758 629 464	6 632 304	-0,81	21. ... Nfd5 22.Nxd8 Qxh4 23.Nf3 Rxg2+ 24.Kxg2 Qg4+ 25.Kh2 Qxf3 26.Nf7 Qxf7 27.f3 e4+ 28.Kg1 Qh5 29.Bxd5 Nxd5 30.Qg2 Nxe3 31.Qg8+ Bc8 32.Rf2 exf3 33.Re1 Ng2 34.Rxg2 fxg2 35.Qxg2 b6 36.Re3 a5 37.bxa5 Qxa5 38.Re8 Qc5+ 39.Qf2 Qb5 40.Qe2 Qd7 41.Kf1 Ka7 42.Ke1 Bb7 43.Re3 Bf4 44.Be5 Bg5 45.Qf2 Qc6 46.Rg3 h5 47.Rxg5 Qc1+ 48.Ke2 Qxg5
 35/37-	01:59	 792 154 281	6 634 013	-0,88	21. ... Nfd5
 35/42-	02:01	 804 089 459	6 634 073	-0,95	21. ... Nfd5
 35/56-	02:08	 850 464 625	6 606 884	-1,38	21. ... Nfd5
 35/58	02:12	 871 662 145	6 581 811	-1,58	21. ... Nfd5 22.Nxd8 Qxh4 23.Nf3 Rxg2+ 24.Kxg2 Qg4+ 25.Kh2 Qxf3 26.Nf7 Qxf7 27.Rh1 Qg6 28.e4 Qh5+ 29.Kg1 Qg4+ 30.Kf1 Qf3 31.Bxd5 Nxd5 32.exd5 Qxh1+ 33.Ke2 Bg4+ 34.Kd2 Qf3 35.Qc4 Qxf2+ 36.Kc3 h5 37.a4 Bf5 38.Kb3 Qe2 39.b5 Bxd3 40.Qh4 Bf5 41.Bc3 Qf3 42.Qc4 Be4 43.Rf1

Code: Select all

Bluefish-12-W-x86-64-modern:
Found 511 tablebases
NNUE evaluation using nn-62ef826d1a6d.nnue enabled
...
 28/43	01:10	 384 240 737	5 488 369	+0,59	21. ... Rxg2+ 22.Kxg2
 29/43-	01:15	 413 046 309	5 491 468	+0,49	21. ... Nbd5
 29/43-	01:16	 419 030 252	5 491 013	+0,26	21. ... Nbd5
 29/43	01:18	 429 855 308	5 498 066	 0,00	21. ... Nbd5 22.Nxd6 Rxg2+ 23.Kxg2 Qg7+ 24.Kh1 Qg4 25.Bxe5 Qh3+ 26.Kg1 Rg8+ 27.Bg3 Rxg3+ 28.fxg3 Qxg3+ 29.Kh1 Qxh4+ 30.Kg1 Qg3+ 31.Kh1
 29/43	01:20	 441 404 485	5 516 797	 0,00	21. ... Nbd5 22.Nxd6 Rxg2+ 23.Kxg2 Qg7+ 24.Kh1 Qg4 25.Bxe5 Qh3+ 26.Kg1 Rg8+ 27.Bg3 Rxg3+ 28.fxg3 Qxg3+ 29.Kh1 Qxh4+ 30.Kg1 Qg3+ 31.Kh1
 30/24	01:21	 452 877 351	5 524 781	 0,00	21. ... Nbd5 22.Nxd6 Rxg2+ 23.Kxg2 Qg7+ 24.Kh1 Qg4 25.Bxe5 Qh3+ 26.Kg1 Rg8+ 27.Bg3 Rxg3+ 28.fxg3 Qxg3+ 29.Kh1 Qxh4+ 30.Kg1 Qg3+ 31.Kh1
 31/23	01:27	 487 384 308	5 555 629	 0,00	21. ... Nbd5 22.Nxd6 Rxg2+ 23.Kxg2 Qg7+ 24.Kh1 Qg4 25.Bxe5 Qh3+ 26.Kg1 Rg8+ 27.Bg3 Rxg3+ 28.fxg3 Qxg3+ 29.Kh1 Qxh4+ 30.Kg1 Qg5+ 31.Kh1 Qh4+
 31/28	01:30	 501 839 817	5 575 254	 0,00	21. ... Nbd5 22.Nxd6 Rxg2+ 23.Kxg2 Qg7+ 24.Kh1 Qg4 25.Bxe5 Qh3+ 26.Kg1 Rg8+ 27.Bg3 Rxg3+ 28.fxg3 Qxg3+ 29.Kh1 Qxh4+ 30.Kg1 Qg5+ 31.Kf2 Qxe3+ 32.Kg2 Qh3+ 33.Kg1 Qg3+ 34.Kh1 Qh3+
 32/28	01:33	 523 206 737	5 574 747	 0,00	21. ... Nbd5 22.Nxd6 Rxg2+ 23.Kxg2 Qg7+ 24.Kh1 Qg4 25.Bxe5 Qh3+ 26.Kg1 Rg8+ 27.Bg3 Rxg3+ 28.fxg3 Qxg3+ 29.Kh1 Qxh4+ 30.Kg1 Qg5+ 31.Kf2 Qxe3+ 32.Kg2 Qh3+ 33.Kg1 Qg3+ 34.Kh1 Qh3+
 33/29	01:37	 544 754 420	5 590 435	 0,00	21. ... Nbd5 22.Nxd6 Rxg2+ 23.Kxg2 Qg7+ 24.Kh1 Qg4 25.Bxe5 Qh3+ 26.Kg1 Bc6 27.Bxd5 Nxd5 28.Qxc6 Rg8+ 29.Bg3 bxc6 30.N6c4 Rxg3+ 31.fxg3 Qxg3+ 32.Kh1 Qh3+ 33.Kg1
 33/29	01:40	 560 287 846	5 602 206	 0,00	21. ... Nbd5 22.Nxd6 Rxg2+ 23.Kxg2 Qg7+ 24.Kh1 Qg4 25.Bxe5 Qh3+ 26.Kg1 Bc6 27.Bxd5 Nxd5 28.Qxc6 Rg8+ 29.Bg3 bxc6 30.N6c4 Rxg3+ 31.fxg3 Qxg3+ 32.Kh1 Qh3+ 33.Kg1
 33/23	01:50	 614 307 113	5 583 950	 0,00	21. ... Nbd5 22.Nxd6 Rxg2+ 23.Kxg2 Qg7+ 24.Kh1 Qg4 25.Bxe5 Qh3+ 26.Kg1 Rg8+ 27.Bg3 Rxg3+ 28.fxg3 Qxg3+ 29.Kh1 Qxh4+ 30.Kg1 Qg5+ 31.Kh1
 34/23-	01:55	 644 272 134	5 592 251	-0,06	21. ... Nfd5
 34/23-	01:56	 650 106 406	5 594 430	-0,12	21. ... Nfd5
 34/23-	01:59	 668 530 983	5 607 117	-0,48	21. ... Nfd5
 33/23	02:00	 673 309 156	5 610 301	-0,48	21. ... Nfd5
 34/23-	02:00	 674 134 094	5 610 303	-0,71	21. ... Nfd5
 34/23-	02:01	 680 583 968	5 610 842	-1,00	21. ... Nfd5
 34/43-	02:05	 701 393 029	5 609 708	-1,86	21. ... Nfd5
 34/46	02:05	 702 892 773	5 610 081	-1,24	21. ... Nfd5 22.Bxd5 Nxd5 23.Nxd8 Qxh4 24.Nf3 Qh3 25.Ne1 e4 26.f4 exf3 27.Rxf3 Qh2+ 28.Kf1 Qh1+ 29.Ke2 Bg4 30.Bd4 Bxf3+ 31.gxf3 Rxd8 32.Kd2 Qg1 33.Rd1 Qg5 34.Qc4 h5 35.Kc2 h4

xr_a_y · Post by **xr_a_y** » Sun Jan 17, 2021 7:10 pm

Somehow this one is quite easy for Minic + nettling nemesis

Code: Select all

info depth 21 score cp 255 time 3846 nodes 2364114 nps 614694 seldepth 36 pv c7h2 g1h2 d8h4 h2g1 h7g5 c3b4 f8e8 b1b2 h6g6 b4d6 g6d6 a5a6 b7a6 d1c2 d6g6 g2g3 g5f3 e2f3 g4f3 b6b7 a8b8 c2c6 g6c6  tbhits 0 hashfull 166

Best move is stable after that but score is increasing

Code: Select all

info depth 35 score cp 477 time 47974 nodes 30774709 nps 641487 seldepth 49 pv c7h2 g1h2 d8h4 h2g1 h7g5 c3b4 f8e8 d1c1 g5f3 e2f3 g4f3 c1c5 e8d7 g2g3 a8g8 c5e7 h4e7 b4e7 d7e7 g1h2 e7d7 a5a6 b7a6 b1b2 d7c8 b6b7 c8b8 f1a1 h5h4 g3g4 c6c5 d4c5 g8g4 a1d1 g4g5 b2d2 b8b7 d2d5 g5g2 h2h3 g2f2 d5d7  tbhits 0 hashfull 860

connor_mcmonigle · Post by **connor_mcmonigle** » Sun Jan 17, 2021 9:53 pm

Hmm. Seer "solves" this position in 1ms:

Code: Select all

uci
id name seer-dev
id author Connor McMonigle
option name Clear Hash type button
option name Threads type spin default 1 min 1 max 512
option name Hash type spin default 128 min 1 max 65536
option name Weights type string default ../train/model/save.bin
uciok
position fen r2q1k2/1pb2p1n/1Pp4r/P2p3p/3Pp1p1/2B1P3/4BPPP/1R1Q1RK1 b - - 0 21 

go infinite
info depth 1 seldepth 2 score cp 81 nodes 88 nps 88000 time 0 pv d8h4 
info depth 2 seldepth 7 score cp -57 nodes 291 nps 291000 time 0 pv c7b8 g1h1 
info depth 3 seldepth 5 score cp 400 nodes 648 nps 324000 time 1 pv c7h2 g1h1 d8h4 
info depth 4 seldepth 5 score cp 329 nodes 954 nps 318000 time 2 pv c7h2 g1h1 d8h4 g2g3 
info depth 5 seldepth 4 score cp 374 nodes 1185 nps 296250 time 3 pv c7h2 g1h1 d8h4 d1b3 
info depth 6 seldepth 4 score cp 346 nodes 2282 nps 380333 time 5 pv c7h2 g1h1 d8h4 a5a6 
info depth 7 seldepth 8 score cp 77 nodes 3019 nps 431285 time 6 pv c7h2 g1h2 d8h4 h2g1 g4g3 c3b4 f8g8 
info depth 8 seldepth 4 score cp 439 nodes 3688 nps 461000 time 7 pv c7h2 g1h1 d8h4 d1c1 
info depth 9 seldepth 10 score cp 171 nodes 6430 nps 494615 time 12 pv c7h2 g1h2 d8h4 h2g1 f8g8 g2g3 h4g3 f2g3 
info depth 10 seldepth 10 score cp 119 nodes 11705 nps 557380 time 20 pv c7h2 g1h2 d8h4 h2g1 f8g8 g2g3 h4h3 c3e1 h7g5 
info depth 11 seldepth 16 score cp 84 nodes 43649 nps 692841 time 62 pv c7h2 g1h2 d8h4 h2g1 h7g5 a5a6 g5f3 g2f3 g4f3 c3b4 f8g7 e2f3 h6g6 
info depth 12 seldepth 8 score cp 127 nodes 49603 nps 708614 time 69 pv c7h2 g1h2 d8h4 h2g1 h7g5 c3e1 g5f3 
info depth 13 seldepth 23 score cp 295 nodes 87169 nps 738720 time 117 pv c7h2 g1h2 d8h4 h2g1 h7g5 c3b4 f8g7 g2g3 h4h3 a5a6 g5f3 e2f3 g4f3 
info depth 14 seldepth 21 score cp 150 nodes 252840 nps 770853 time 327 pv c7h2 g1h2 d8h4 h2g1 h7g5 c3b4 f8g7 b4e7 a8h8 e7g5 h4g5 f1e1 g5h4 b1b2 h8h7 a5a6 g4g3 f2g3 
info depth 15 seldepth 24 score cp 267 nodes 293697 nps 772886 time 379 pv c7h2 g1h2 d8h4 h2g1 h7g5 c3b4 f8g7 b4e7 a8h8 d1c2 f7f6 e7f6 g7f6 c2c5 g5f3 g2f3 g4f3 c5d6 f6g7 
info depth 16 seldepth 30 score cp 210 nodes 433744 nps 771786 time 561 pv c7h2 g1h2 d8h4 h2g1 h7g5 c3b4 f8e8 f1e1 h6g6 b4d6 g6d6 a5a6 b7a6 d1c2 g5f3 e2f3 g4f3 b6b7 a8b8 b1b6 d6e6 
info depth 17 seldepth 30 score cp 286 nodes 506781 nps 771356 time 656 pv c7h2 g1h2 d8h4 h2g1 h7g5 c3b4 f8e8 f1e1 h6g6 b4d6 g6d6 a5a6 b7a6 b6b7 a8b8 e1f1 d6f6 d1c2 g5f3 g2f3 g4f3 
info depth 18 seldepth 27 score cp 481 nodes 1054048 nps 762697 time 1381 pv c7h2 g1h2 d8h4 h2g1 h7g5 c3b4 f8e8 b4a3 h6g6 a3e7 e8e7 d1b3 g5f3 e2f3 g4f3 b3b4 e7f6 
info depth 19 seldepth 30 score cp 463 nodes 1597084 nps 759070 time 2103 pv c7h2 g1h2 d8h4 h2g1 h7g5 c3b4 f8e8 b4e1 g5f3 g2f3 g4f3 e2f3 e4f3 d1f3 h6g6 f3g3 g6g3 f2g3 h4e4 e1d2 h5h4 g1h2 a8b8 b1b3 b8a8 
info depth 20 seldepth 37 score cp 701 nodes 3932326 nps 745182 time 5276 pv c7h2 g1h2 d8h4 h2g1 h7g5 c3b4 f8e8 b4d6 h6d6 a5a6 a8a6 f1e1 a6a2 g2g3 h4h3 e2f1 d6f6 b1c1 g5f3 d1f3 f6f3 
info depth 21 seldepth 44 score cp 519 nodes 6243679 nps 743206 time 8400 pv c7h2 g1h2 d8h4 h2g1 h7g5 c3b4 f8e8 d1c2 a8a5 b4d6 h6d6 c2d2 g5f3 e2f3 g4f3 d2a5 f3g2 a5a8 d6d8 a8d8 h4d8 g1g2 d8h4 f1h1 h4g4 g2h2 
info depth 22 seldepth 35 score cp 600 nodes 7515651 nps 742873 time 10116 pv c7h2 g1h2 d8h4 h2g1 h7g5 c3b4 f8e8 d1c1 a8a5 b4d6 h6d6 c1d2 g5f3 e2f3 g4f3 d2a5 f3g2 a5a8 d6d8 a8d8 e8d8 g1g2 d8e7 f1c1 h4g5 g2h1 e7f6 c1c6 b7c6 
info depth 23 seldepth 34 score cp 567 nodes 10957548 nps 741126 time 14784 pv c7h2 g1h2 d8h4 h2g1 h7g5 c3b4 f8e8 d1c1 a8a5 b4d6 h6d6 c1d2 a5a8 b1a1 a8a1 f1a1 g4g3 f2g3 h4g3 a1a8 d6d8 d2a5 g3e3 g1f1 g5e6 e2h5 e3d4 
info depth 24 seldepth 38 score cp 692 nodes 17747920 nps 737284 time 24071 pv c7h2 g1h2 d8h4 h2g1 h7g5 c3b4 f8e8 d1c2 a8a5 b4d6 h6d6 c2c3 a5a2 c3b4 d6g6 g2g3 g5f3 e2f3 g4f3 b4d6 g6d6 g3h4 e8e7 g1h2 d6g6 h2h3 
info depth 25 seldepth 47 score cp 773 nodes 27429235 nps 734206 time 37358 pv c7h2 g1h2 d8h4 h2g1 h7g5 c3b4 f8e8 d1c2 a8a5 g2g3 h4h3 f2f4 g4f3 e2f3 e4f3 c2h2 h3h2 g1h2 a5a6 f1f2 a6b6 h2g1 h6g6 g1h1 b6b5 h1g1 g5h3 g1f1 g6g3 f2h2 
info depth 26 seldepth 40 score cp 839 nodes 36867787 nps 731286 time 50414 pv c7h2 g1h2 d8h4 h2g1 h7g5 c3b4 f8e8 d1c2 a8a5 b4e7 e8e7 c2b3 g5f3 e2f3 g4f3 b3b4 h6d6 g2f3 e4f3 f1c1 h4g4 g1f1 g4g2 f1e1 g2g1 e1d2 
info depth 27 seldepth 49 score cp 928 nodes 64989286 nps 730085 time 89015 pv c7h2 g1h2 d8h4 h2g1 h7g5 c3b4 f8e8 a5a6 a8a6 d1c2 a6a5 g2g3 h4h3 f2f4 h3g3 g1h1 g3h3 h1g1 g5f3 e2f3 g4f3 c2h2 h6g6 g1h1 h3g2 h2g2 f3g2 h1h2 g2f1n b1f1 a5a2 h2h3 a2e2 f1a1 e2e3 h3h4 e3e2 h4h3 g6g2 h3h4 e8d7 a1a7 d7e6 a7b7 e4e3

Dann Corbit · Post by **Dann Corbit** » Mon Jan 18, 2021 3:09 am

connor_mcmonigle wrote: ↑Sun Jan 17, 2021 9:53 pm Hmm. Seer "solves" this position in 1ms:

It seems a backhanded compliment in some way (but so are many of the Beowulf compliments "he was not the sort of man who would stab you in the back at the first opportunity" when the idea transferred was really "he was trustworthy")

And yet, there is something excellent here.

We sometimes use the term "less is more" and it can be true with pruning.

We want to throw away the stupid moves. But we need to be really sure that they are stupid.

Test position bm Bxh2+

Re: 2nd test position (Black to play) bm Nfd5!!

Re: 2nd test position (Black to play) bm Nfd5!!

Re: 2nd test position (Black to play) bm Nfd5!!

Re: Test position bm Bxh2+

Re: 2nd test position (Black to play) bm Nfd5!!

Re: Test position bm Bxh2+

Re: Test position bm Bxh2+

Re: Test position bm Bxh2+