Test Position: Nxg2 followed by d4!

[swami]

[d]r2qr1k1/p4pbp/bp4p1/3p4/8/BPN1n1P1/P2QN1BP/R2R2K1 b - - 0 18

Does your engine find Nxg2 first, then show Kxg2, d4! in analysis line?

[Ross Boyd]

Yes...

TRACE 2 needs about 35 seconds on a Q6600 (single threaded)

Code: Select all

FEN: r2qr1k1/p4pbp/bp4p1/3p4/8/BPN1n1P1/P2QN1BP/R2R2K1 b - - 0 18 

TRACE 2.00:
  1/4	00:00.157	       2.537	0	+0.70	Nxd1
  2/11	00:00.157	       2.716	0	+0.70	Nxd1 Rxd1
  3/12	00:00.157	       6.306	5.000	+0.28	Nxd1 Rxd1 Bxe2
  3/13	00:00.157	       8.363	5.000	+0.56	Bxe2 Nxe2 Bxa1
  3/12	00:00.157	       9.444	5.000	+0.61	Rc8 Nd4 Nxd1
  4/13	00:00.157	      15.735	15.000	+0.61	Rc8 Nd4 Nxd1 Rxd1
  5/14	00:00.188	      47.995	1.451.612	+0.28	Rc8 Nd4 Nxd1 Rxd1 Re5
  5/13	00:00.188	      54.019	1.612.903	+0.64	Bxe2 Nxe2 Bxa1 Rxa1 Rc8
  6/15	00:00.219	      99.179	1.532.258	+0.66	Bxe2 Nxe2 Bxa1 Rxa1 Rc8 Nd4
  6/18	00:00.250	     149.144	1.559.139	+0.78	Rc8 Nd4 Bxd4 Qxd4 Nc2 Qa4
  7/19	00:00.313	     230.995	1.474.358	+0.78	Rc8 Nd4 Bxd4 Qxd4 Nc2 Qa4 Nxa1
  8/21	00:00.485	     457.368	1.537.162	+0.78	Rc8 Nd4 Bxd4 Qxd4 Nc2 Qa4 Nxa1 Qxa6
  9/25	00:00.766	     924.762	1.510.673	+0.59	Rc8 Nd4 Bxd4 Qxd4 Nc2 Qa4 Rxc3 Bb2 Rc7
  9/22	00:00.829	   1.024.038	1.520.119	+0.60	Bxe2 Nxe2 Bxa1 Rxa1 Rc8 Nd4 Nxg2 Kxg2 Qf6
 10/22	00:01.579	   2.247.252	1.579.873	+0.60	Bxe2 Nxe2 Bxa1 Rxa1 Rc8 Nd4 Qf6 Re1 Nxg2 Rxe8+ Rxe8
 11/24	00:03.719	   5.613.469	1.574.957	+0.60	Bxe2 Nxe2 Bxa1 Rxa1 Rc8 Nd4 Qf6 Re1 Nxg2 Rxe8+ Rxe8 Kxg2
 11/29	00:05.875	   7.400.751	1.568.461	+0.65	Rc8 Nd4 Nf5 Nxf5 Bxc3 Nh6+ Kg7 Nxf7 Bxd2 Nxd8 Be3+ Kh1 Rexd8
 12/31	00:10.172	  15.843.484	1.581.627	+0.57	Rc8 Nd4 Bxd4 Qxd4 Nc2 Qa4 Rxc3 Bb2 Rce3 Qxa6 Nxa1
 13/38	00:30.922	  47.891.414	1.608.936	+0.55	Rc8 Nd4 Bf6 Rdc1 Nxg2 Kxg2 Bg5 Qb2 Bxc1 Rxc1 Bd3
 13/37	00:35.500	  57.310.278	1.621.537	+1.28	Nxg2 Kxg2 d4 Nxd4 Bb7+ Kf2 Qd7 Bb4 Rad8 Nf3 Qc6 Qf4 Bxc3
 14/38	00:44.782	  72.618.180	1.627.226	+1.54	Nxg2 Kxg2 d4 Nxd4 Bb7+ Kf2 Qd7 Rac1 Rad8 Nf3 Qc6 Qf4 Bxc3 Rxd8 Rxd8

[Tony Thomas]

I see that you got Trace 2 almost ready...

[Dr.Wael Deeb]

I see that you got Trace 2 almost ready...

It seems that you have big eyes Tony and they function well

[Ross Boyd]

I see that you got Trace 2 almost ready...

I wish, I wish...

She usually solves faster than 1.37a but she doesn't play well.
And the search has some 'sticking' points which I haven't solved yet.

Time is very limited here... doing some studies as well as full-time work.... so don't get excited... just yet...

sorry

Ross

[Guetti]

Hiracs 11.2MP finds it immediately (1s), but then switches moves d4 first followed by Nxg2:

Code: Select all

8 -3 60 325910 Bxe2 Nxe2 Bxa1 Rxa1 Rc8 Nd4 f5 Re1 Nxg2 Kxg2
9 +7 84 475125 Bxe2 Nxe2 Bxa1 Rxa1 Nxg2 Kxg2 d4 Nxd4 Qd5+ Kf2 Rad8 Rd1 Qe4
10 -15 149 989696 Bxe2 Nxe2 Bxa1 Rxa1 Nxg2 Kxg2 Rc8 Nd4 a6 Rf1 f5 Qh6 Qf6
10 -14 164 1125452 Nxg2
10 +32 171 1158335 Nxg2
10 +165 194 1314022 Nxg2 Kxg2 d4 Nxd4 Bb7+ Kf1 Qd7 Ndb5 Qc6 Nd5 Qxb5+
11 +142 249 1743545 Nxg2 Kxg2 d4 Nxd4 Bb7+ Kf2 Qd7 Rac1 Bxd4+ Qxd4
12 +167 336 2527742 Nxg2
12 +219 420 3328467 Nxg2 Kxg2 d4 Nxd4 Bb7+ Kf2 Qd7 Ncb5 Qd5 Rg1 a6 Qf4 axb5 Bb2
13 +244 633 5324368 Nxg2
13 +288 1040 9326798 Nxg2 Kxg2 d4 Bb2 dxc3 Nxc3 Qxd2+ Rxd2 Rac8 Nd1 Bb7+ Kh3 Bxb2 Rxb2 Rc5 g4 f5 Nf2 f4
14 +278 1759 16290675 Nxg2 Kxg2 d4 Bb2 dxc3 Nxc3 Qxd2+ Rxd2 Rac8 Nd1 Bb7+ Kf1 Bh6 Rf2 f5 Bc3 Bf8 a4 Bd6
14 +279 2292 21189014 d4
14 +279 2392 22188084 d4 Nxd4 Nxg2 Kxg2 Bb7+ Kf2 Qd7 Nf3
15 +291 3246 30567428 d4 Nxd4 Nxg2 Kxg2 Bb7+ Kf2 Qd7 Nf3 Qxd2+ Nxd2 Bd4+ Kf1 Bc8 Nce4 Ba6+ Kg2 Bxa1 Rxa1 Bb7 Re1 f5 Kf3 Rad8 Bb4 fxe4+ Nxe4
16 +291 5150 49048660 d4 Nxd4 Nxg2 Kxg2 Bb7+ Kf2 Qd7 Nf3 Qxd2+ Nxd2 Bd4+ Kf1 Bc8 Nce4 Ba6+ Kg2 Bxa1 Rxa1 Bb7 Re1 f5 Kf3 Rad8 Bb4 fxe4+