am = h6, but what is bm?

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Dann Corbit
Posts: 12540
Joined: Wed Mar 08, 2006 8:57 pm
Location: Redmond, WA USA

am = h6, but what is bm?

Post by Dann Corbit »

From:
https://glarean-magazin.ch/2007/08/19/das-h6-syndrom/

This position:
[d]r2q1rk1/pp1n1ppp/2pbpn2/6B1/3P3Q/2NB3P/PPP3P1/R4RK1 b - -
has am h6.

Indeed, h6 gives -1/2 pawn:

Code: Select all

FEN: r2q1rk1/pp1n1ppp/2pbpn2/6B1/3P3Q/2NB3P/PPP3P1/R4RK1 b - - 0 1 

Stockfish-x64-mingw:
  2/2	00:00	      38,724	3,227,000	-0.95	h6 Bxh6
  3/3	00:00	      60,359	3,772,437	-1.16	h6 Bxh6 gxh6 Qxh6
  4/5	00:00	      79,644	3,982,200	-0.20	h5 Ne4 Be7 c3
  5/5	00:00	      99,121	4,309,608	-0.57	h5 Ne4 Be7 c3 b6
  6/7	00:00	     121,220	4,489,629	-0.70	h6 Bxh6 gxh6 Qxh6 Bb8 h4 Qc7 Rxf6 Nxf6
  7/7	00:00	     151,111	4,579,121	-1.06	h6 Bxh6 gxh6 Qxh6 Bb8 a3 Qc7
  8/9	00:00	     178,712	4,830,054	-0.89	h5 Ne4 Be7 a3 Qc7 Ng3 g6 c4
  9/10	00:00	     210,729	5,017,357	-0.46	h5 Ne4 Be7 c3 c5 Nxf6+ Nxf6 Bxf6 Bxf6 Qxh5
 10/13	00:00	     263,250	5,062,500	-1.14	h5 Ne4 Be7 c3 a6 a3 Ra7 Nxf6+ Bxf6 Qxh5 g6 Bxf6 gxh5 Bxd8
 11/14	00:00	     299,855	5,169,913	-0.77	h5 Ne4 Be7 c3 Rc8 Rad1 Qa5 Ng3 Qxa2 Rd2 c5 Nxh5
 12/19	00:00	     663,353	5,718,560	-0.68	h5 Ne4 Be7 Rae1 Qb6 Ng3 g6 Bxf6 Nxf6 Rxf6 Bxf6 Qxf6 Qxb2
 13/19	00:00	   1,071,216	6,018,067	-0.81	h5 Ne4 Be7 c3 Re8 Nxf6+ Nxf6 Rae1 Kf8 Qg3 Bd6 Qf3 Be7 Bxf6 Bxf6 Qxh5 Qd5
 14/27	00:00	   1,235,659	6,057,151	-0.99	h5 Ne4 Be7 c3 Re8 Nxf6+ Nxf6 Rae1 Kf8 Re5 Qb6 Rxf6 Bxf6 Bxf6 gxf6 Rxh5 Ke7 Rh6
 15/28	00:00	   2,376,222	6,319,739	-0.96	h5 Ne4 Be7 c3 Re8 Nxf6+ Nxf6 Rae1 a6 Bxf6 Bxf6 Qxh5 Kf8 b3 Qd5 Re5 Qd7 Re2 Qd5
 16/34	00:00	   2,903,522	6,353,439	-1.05	h5 Ne4 Be7 c3 Re8 Nxf6+ Nxf6 Rae1 a6 Rf3 Kf8 Ref1 c5 Rxf6 Bxf6 Qxh5 Qd5 Qh8+ Ke7 Bxf6+ gxf6 Qxf6+ Kd7 Qxf7+ Re7
 17/34	00:01	   6,223,830	6,255,105	-1.00	h5 Ne4 Be7 c3 Re8 Nxf6+ Nxf6 Rf3 Nd5 Qxh5 f5 h4 Rf8 Qg6 Bf6 Re1 Qd7 g4 Bxg5 Qxg5 fxg4 Qxg4 Rxf3 Qxf3 Qf7
 18/37	00:01	  11,721,620	6,329,168	-1.14	h5 Ne4 Be7 c3 Re8 Nxf6+ Nxf6 Rf3 Kf8 Raf1 a6 Be4 Kg8 Bxf6 Bxf6 Qxh5 Bxd4+ cxd4 Qxd4+ Kh1 Qxe4 Qxf7+ Kh8 Rg3 Rg8 Rg4 Qh7
 19/37	00:03	  18,804,656	6,310,287	-0.87	h6 Bxh6 gxh6 Ne4 Be7 Qxh6 Nxe4 Bxe4 f5 Qxe6+ Kg7 Bxf5 Nf6 Rf4 Qd6 Qe3 Nh7 Rg4+ Kh8 Bd3 Rf7 Re1 Raf8 Kh1 Qd5 c4 Qh5 Rg6 Bf6 b3 Bg7
 20/37	00:03	  19,563,165	6,316,811	-0.71	h6 Bxh6 gxh6 Ne4 Be7 Qxh6 Nxe4 Bxe4 f5 Qxe6+ Kg7 Bxf5 Nf6 Rf4 Qd6 Qe3 Nh7 Raf1 Kh8 Qb3 Qc7 Rg4 Bd6 Rh4 Rf7 Rh5 Bh2+ Kh1
 21/37	00:03	  20,182,779	6,315,012	-0.65	h6 Bxh6 gxh6 Ne4 Be7 Qxh6 Nxe4 Bxe4 f5 Qxe6+ Kg7 Bxf5 Nf6 Rf4 Qd6 Qe3 Nh7 Raf1 Kh8 Bxh7 Rxf4 Qxf4 Kxh7 Qxd6 Bxd6 Rf7+ Kg6 Rxb7 Kh6
 22/39	00:03	  23,341,766	6,251,142	-0.64	h6 Bxh6 gxh6 Ne4 Be7 Qxh6 Nxe4 Bxe4 f5 Qxe6+ Kg7 Bxf5 Nf6 Rf4 Qd6 Qe3 Nh7 Rg4+ Kh8 Bd3 Rf7 c3 Raf8 Re1 Bd8 Rg6 Qf4 Qxf4 Rxf4 Rh6 Rh4
 23/54	00:07	  49,653,998	6,330,188	-0.83	h6 Bxh6 gxh6 Ne4 Be7 Qxh6 Nxe4 Bxe4 f5 Qxe6+ Kg7 Bxf5 Nf6 Rf4 Rf7 Bd3 Qd5 Qe3 Kg8 Rf5 Qd6 Rg5+ Kh8 Rf1 Rg8 Bg6 Rh7 Bxh7 Rxg5 Qxg5 Qxd4+ Kh1 Kxh7 Qf5+ Kh6
 24/54	00:09	  59,488,856	6,357,684	-0.52	h6 Bxh6 gxh6 Ne4 Be7 Qxh6 Nxe4 Bxe4 f5 Qxe6+ Kg7 Bxf5 Nf6 Rf4 Rf7 Bd3 Qd5 Qe3 Qg5 Raf1 Kh8 h4 Qh6 Qe5 Raf8 h5 Rg7 Bg6 Nd7 Qc7 Rxf4 Rxf4 Bg5 Rf5 Be3+ Kf1
 25/54	00:12	  76,947,639	6,416,580	-0.70	h6 Bxh6 gxh6 Ne4 Be7 Qxh6 Nxe4 Bxe4 f5 Qxe6+ Kg7 Bxf5 Nf6 Rf4 Rf7 Qe3 Nh7 Raf1 Bg5 Qe5+ Kh6 Rg4 Qe7 h4 Qxe5 dxe5 Be3+ Kh1 Rg7 Re4 Bb6 g4 Rd8 g5+ Nxg5 hxg5+ Rxg5 Rh4+ Rh5 Rxh5+ Kxh5 Kg2 a5 Kg3 Kg5
 26/55	00:13	  87,768,141	6,447,376	-0.84	h6 Bxh6 gxh6 Ne4 Be7 Qxh6 Nxe4 Bxe4 f5 Qxe6+ Kg7 Bxf5 Nf6 Rf4 Rf7 Qe3 Nh7 Raf1 Bg5 Qe5+ Kh6 Rg4 Qe7 h4 Be3+ Kh2 Qxe5+ dxe5 Rg7 Re4 Bc5 g4 Rd8 g5+ Nxg5 hxg5+ Rxg5 Rh4+ Rh5 Kh3 Rd2 Bd3 Rxh4+ Kxh4
 27/57	00:16	 107,039,864	6,464,540	-0.79	h6 Bxh6 gxh6 Ne4 Be7 Qxh6 Nxe4 Bxe4 f5 Qxe6+ Kg7 Bxf5 Nf6 Rf4 Rf7 Qe3 Nh7 Raf1 Bd6 Re4 Kh8 Re6 Qf8 g4 Rf6 Rxf6 Nxf6 Qg5 Ng8 Bd3 Qg7 Qh4+ Qh6 Qxh6+ Nxh6 Rf6 Bf8 g5 Bg7 Rf1 Bxd4+ Kg2
 28/57	00:23	 151,602,565	6,526,154	-0.60	h6 Bxh6 gxh6 Ne4 Be7 Qxh6 Nxe4 Bxe4 f5 Qxe6+ Kg7 Bxf5 Nf6 Rf4 Rf7 Qe3 Nh7 Raf1 Bd6 Re4 Kh8 Re6 Bf8 c3 Bg7 g4 Qh4 Kg2 Raf8 Qe1 Qd8 h4 Qd5+ Kg1 Qxa2 Qe2 Qd5 Rf2 Qb5
 29/57	00:26	 173,779,585	6,548,083	-0.66	h6 Bxh6 gxh6 Ne4 Be7 Qxh6 Nxe4 Bxe4 f5 Qxe6+ Kg7 Bxf5 Nf6 Rf4 Rf7 Qe3 Nh7 Raf1 Bd6 Re4 Kh8 Re6 Bf8 c3 Bg7 Qe2 Qh4 Kh2 Rf6 Re4 Qg5 Rg4 Qh5 Qe7 Qf7 Qxf7 Rxf7 Rh4 Bf8 Rxh7+ Rxh7 Bxh7
 30/60	00:38	 255,377,441	6,576,977	-0.65	h6 Bxh6 gxh6 Ne4 Be7 Qxh6 Nxe4 Bxe4 f5 Qxe6+ Kg7 Bxf5 Nf6 Rf4 Rf7 Qe3 Nh7 Raf1 Bd6 Re4 Kh8 Re6 Bf8 c3 Bg7 Bxh7 Rxf1+ Kxf1 Kxh7 Re7 Qd5 Rxb7 Qxa2 Qe4+ Kh8 Kg1 Qa1+ Kh2 Qc1 Rc7 a5 Qxc6 Rf8 Qg6 Qf4+ Qg3 Qxg3+ Kxg3 Rb8 Ra7 Rxb2 h4 Kg8
 31/60	00:43	 282,976,502	6,569,695	-0.71	h6 Bxh6 gxh6 Ne4 Be7 Qxh6 Nxe4 Bxe4 f5 Qxe6+ Kg7 Bxf5 Nf6 Rf4 Rf7 Qe3 Nh7 Raf1 Bd6 Re4 Kh8 Re6 Bf8 c3 Bg7 Bxh7 Rxf1+ Kxf1 Kxh7 Re7 Qd5 Kg1 Rf8 Rxb7 Rf7 Rxf7 Qxf7 Qe4+ Qg6 Qxg6+ Kxg6 Kf2 Kf7 Kf3
 32/60	00:46	 301,558,180	6,557,038	-0.71	h6 Bxh6 gxh6 Ne4 Be7 Qxh6 Nxe4 Bxe4 f5 Qxe6+ Kg7 Bxf5 Nf6 Rf4 Rf7 Qe3 Nh7 Raf1 Bd6 Re4 Kh8 Re6 Bf8 c3 Bg7 Bxh7 Rxf1+ Kxf1 Kxh7 Re7 Qd5 Kg1 Rf8 Rxb7 Rf7 Rxf7 Qxf7 Qe4+ Qg6 Qxg6+ Kxg6 Kf2 Bh6 b3 Bd2
 33/60	00:53	 351,731,014	6,594,997	-0.72	h6 Bxh6 gxh6 Ne4 Be7 Qxh6 Nxe4 Bxe4 f5 Qxe6+ Kg7 Bxf5 Nf6 Rf4 Rf7 Qe3 Nh7 Raf1 Bd6 Re4 Kh8 Re6 Bf8 c3 Bg7 Bxh7 Rxf1+ Kxf1 Kxh7 Re7 Qd5 Kg1 Rf8 Rxb7 Rf7 Rxf7 Qxf7 Qe4+ Qg6 Qxg6+ Kxg6 Kf2 Bh6 b3 Bd2 c4 Bg5 Kf3 Kf7
 34/61	01:41	 669,415,270	6,633,588	-0.53	h6 Bxh6 gxh6 Ne4 Be7 Qxh6 Nxe4 Bxe4 f5 Qxe6+ Kg7 Bxf5 Nf6 Rf4 Rf7 Qe3 Nh7 Raf1 Bd6 Re4 Kh8 Re6 Bf8 c3 Bg7 Bxh7 Rxf1+ Kxf1 Kxh7 Kg1 Kh8 Re7 Rb8 Qe6 Qf8 Rf7 Qg8 Qf5 Qh7 Qf4 Rg8 Rxb7 Qg6 Rb8 Rxb8 Qxb8+ Kh7 a3 Qh6 Kh2 Qd2 Qd6 Qxb2
 35/63	03:02	1,215,032,283	6,652,462	-0.58	h6 Bxh6 gxh6 Ne4 Be7 Qxh6 Nxe4 Bxe4 f5 Qxe6+ Kg7 Bxf5 Nf6 Rf4 Rf7 Qe3 Nh7 Raf1 Bd6 Re4 Kh8 Re6 Bf8 c3 Bg7 Qe2 Qh4 Kh2 Qg5 Rg6 Qe7 Qh5 Raf8 h4 Be5+ g3 Bc7 a4 Qe3 Kh3
 36/63	03:52	1,548,952,498	6,666,663	-0.64	h6 Bxh6 gxh6 Ne4 Be7 Qxh6 Nxe4 Bxe4 f5 Qxe6+ Kg7 Bxf5 Nf6 Rf4 Rf7 Qe3 Nh7 Raf1 Bd6 Re4 Kh8 Re6 Bf8 c3 Bg7 Qe2 Qh4 Kh2 Rf6 Re4 Qg5 Rg4 Qh5 Qe7 Qf7 Qxf7 Rxf7 Rh4 Bf8 Kg1 Re8 g4 Bd6 Rh6 Bb8 h4 Re2 g5 Rxb2 g6 Rg7 Rxh7+ Rxh7 gxh7
 37/63	05:25	2,188,033,397	6,716,992	-0.57	h6 Bxh6 gxh6 Ne4 Be7 Qxh6 Nxe4 Bxe4 f5 Qxe6+ Kg7 Bxf5 Nf6 Rf4 Rf7 Bd3 Qd5 Qe3 Qg5 Raf1 Kh8 h4 Qh6 Qe5 Rd8 c3 Rd6 Rg4 Rg7 Rxf6 Rxf6 Rg5 Bd6 Qe8+ Rf8 Rh5 Rxe8 Rxh6+ Kg8 Rxd6 Re1+ Kf2 Rd1 Bg6 Kf8 Re6 Re7 Rxe7 Kxe7 Ke3 Kf6 Be4 Rh1 d5 cxd5 Bxd5 Rxh4
 38/70	09:28	3,817,346,453	6,719,272	-0.59	h6 Bxh6 gxh6 Ne4 Be7 Qxh6 Nxe4 Bxe4 f5 Qxe6+ Kg7 Bxf5 Nf6 Rf4 Rf7 Bd3 Qd5 Qe3 Qg5 Raf1 Kh8 h4 Qh6 Qe5 Rd8 c3 Rd6 Rg4 Rg7 Rxf6 Rxf6 Rg5 Rf1+ Kxf1 Bxg5 hxg5 Qh1+ Kf2 Qh4+ Kg1 Qxg5 Qh2+ Kg8 Bc4+ Kf8 Qb8+ Ke7 Qxb7+ Kd6 Qb8+ Kd7 Qxa7+ Kd6 Qb8+ Kd7 g3 Qxg3+ Qxg3 Rxg3+ Kf2 Rh3 Bf1 Rh2+ Bg2 Ke6 Kg3
 39/76	12:07	4,895,662,222	6,726,390	-0.47	h6 Bxh6 gxh6 Ne4 Be7 Qxh6 Nxe4 Bxe4 f5 Qxe6+ Kg7 Bxf5 Nf6 Rf4 Rf7 Qe3 Nh7 Raf1 Bd6 Re4 Kh8 Re6 Bf8 c3 Bg7 Rf4 Qd7 g4 Raf8 h4 Qd5 a4 Qb3 Rf2 Qxa4 Qf3 Qa2 Ree2 Qa5 Qg3 Qd8 Rf1 Qd5 Qe3 Rxf5 gxf5 Bf6 Qf4 Rg8+ Kh2 Qd8 Kh3
 40/76	14:17	5,784,524,762	6,744,590	-0.47	h6 Bxh6 gxh6 Ne4 Be7 Qxh6 Nxe4 Bxe4 f5 Qxe6+ Kg7 Bxf5 Nf6 Rf4 Rf7 Qe3 Nh7 Raf1 Bd6 Re4 Kh8 Re6 Bf8 c3 Bg7 Qe2 Qh4 Kh2 Qg5 Rg6 Qe7 Qh5 Raf8 h4 c5 Rg3 Bh6 dxc5 Rf6 Rgf3 Qxc5 Kh1 Qc6 Qg4 Qd5 b4 Rg8 Qe4 Qxe4 Bxe4 Rxf3 Rxf3
But what is the right move?
I can easily find alternatives for all the other am h6 moves in the article, but that one position eludes me.

What shall I move instead?
Taking ideas is not a vice, it is a virtue. We have another word for this. It is called learning.
But sharing ideas is an even greater virtue. We have another word for this. It is called teaching.
Top
Dann Corbit
Posts: 12540
Joined: Wed Mar 08, 2006 8:57 pm
Location: Redmond, WA USA

Re: am = h6, but what is bm?

Post by Dann Corbit »

Code: Select all

FEN: r2q1rk1/pp1n1ppp/2pbpn2/6B1/3P3Q/2NB3P/PPP3P1/R4RK1 b - - 0 1 

Stockfish-x64-mingw:
  2/2	00:00	      36,142	3,011,833	-1.07	a6 Ne4
  3/3	00:00	      55,656	3,478,500	-1.32	h6 Bxh6 gxh6
  4/4	00:00	      75,405	3,968,684	-1.27	h6 Bxh6 gxh6 Qxh6
  5/6	00:00	      96,814	4,209,304	-0.54	h5 Ne4 Be7 c3 c5 dxc5
  6/6	00:00	     116,775	4,491,346	-0.62	h5 Ne4 Be7 Ng3 Qb6 Nxh5 Qxb2 c4
  7/7	00:00	     141,366	4,560,193	-0.62	h6 Bxh6 gxh6 Qxh6 Re8 a4 Bf8
  8/8	00:00	     162,429	4,777,323	-0.54	h6 Bxh6 gxh6 Qxh6 Re8 Rf3 Qa5 Ne4
  9/12	00:00	     212,107	4,932,720	-1.09	h5 Ne4 Be7 c3 Rc8 a3 b5 Bxf6 Bxf6
 10/13	00:00	     244,532	4,990,448	-0.85	h5 Ne4 Be7 c3 Rc8 a3 Ra8 Bxf6 Nxf6 Nxf6+ Bxf6 Qxh5
 11/16	00:00	     318,016	5,129,290	-0.92	h5 Ne4 Be7 c3 a6 a3 Qc7 Bxf6 Bxf6 Qxh5 g6 Nxf6+ Nxf6 Qg5
 12/16	00:00	     485,525	5,455,337	-1.07	h5 Ne4 Be7 c3 a6 Rae1 Qa5 Ng3 c5 Nxh5 cxd4 Nxf6+ Nxf6 cxd4
 13/24	00:00	     929,402	5,957,705	-0.66	h5 Ne4 Be7 Rae1 Qb6 Ng3 g6 Bxf6 Nxf6 Rxf6 Bxf6 Qxf6 Qxb2 Ne4 Qxa2
 14/24	00:00	   1,434,398	6,077,957	-1.00	h5 Ne4 Be7 Rae1 Re8 Nxf6+ Nxf6 c3 Kf8 a3 a6 Qg3 Rb8 Qe5 Qd5 Qg3 Qb3 Rf2
 15/24	00:00	   1,672,109	6,080,396	-0.85	h5 Ne4 Be7 c3 Re8 Nxf6+ Nxf6 Rae1 Kf8 Re5 Rc8 Qf2 Bd6 Qe3 Bxe5 dxe5 Nd5 Qf3 f6 Qxh5
 16/30	00:00	   3,028,972	6,143,959	-0.85	h5 Ne4 Be7 c3 Re8 Nxf6+ Nxf6 Rae1 Qc7 Re5 Kf8 g4 Rad8 gxh5 Ng8 Rxe6 Rd5 Bxe7+ Rxe7 Rxe7 Qxe7
 17/30	00:01	   7,607,801	6,345,121	-1.16	h5 Ne4 Be7 c3 e5 dxe5 Nd5 Qxh5 g6 Qh6 Nxe5 c4 f5 cxd5 fxe4 Bxe7 Qxe7 Bxe4 Qg7 Qxg7+ Kxg7 dxc6
 18/30	00:01	  11,292,864	6,387,366	-1.52	h5 Ne4 Be7 c3 Re8 Nxf6+ Bxf6 Qxh5 Bxg5 Qxf7+ Kh8 Qg6 Be3+ Kh1 Qh4 Rf7 Qh6 Rxd7 e5 dxe5 Qxg6 Bxg6 Re6 Re1 Rxe5 Rxb7 Rd8 g4
 19/41	00:03	  20,673,791	6,458,541	-1.12	h6 Bxh6 gxh6 Ne4 Nh7 Qxd8 Raxd8 Nxd6 Ndf6 Nxb7 Rxd4 Na5 Rc8 Nb3 Rb4 c3 Ra4 Nd2 Ra5 a3 Rd5 Rf3 Kg7 Raf1
 20/41	00:03	  23,396,216	6,473,773	-1.04	h6 Bxh6 gxh6 Ne4 Nh7 Qxd8 Raxd8 Nxd6 Ndf6 Nxb7 Rxd4 Na5 Rc8 Nb3 Rd7 Nc5 Rd4 Rf3 Rb8 b3 e5 Re1 Rd5 Ne4 Nxe4
 21/41	00:05	  35,137,790	6,486,577	-1.22	h6 Bxh6 gxh6 Ne4 Nh7 Qxd8 Raxd8 Nxd6 Ndf6 Nxb7 Rxd4 Na5 Rc8 Rf3 Nd5 Bxh7+ Kxh7 Rxf7+ Kg6 Rd7 Nf4 Rxd4 Ne2+ Kf2 Nxd4 c3 Rf8+ Kg1 Nc2 Rf1
 22/41	00:06	  39,574,907	6,484,500	-1.12	h6 Bxh6 gxh6 Ne4 Nh7 Qxd8 Raxd8 Nxd6 Ndf6 Nxb7 Rxd4 Na5 Rc8 Rf3 Rc7 Nb3 Rh4 Raf1 Ra4 Nc1 Nh5 Bxh7+ Kxh7 Rxf7+ Rxf7 Rxf7+ Kg6 Re7 Nf4
 23/41	00:07	  45,436,508	6,523,547	-1.01	h6 Bxh6 gxh6 Ne4 Nh7 Qg4+ Ng5 Nxd6 Nf6 Qg3 Nh5 Qe5 f6 Qh2 f5 c3 Qc7 h4 Nf7 Nxf7 Qxf7 Rae1 Rae8 Bc4 Ng7 Qf4 Kh7 Re3
 24/41	00:08	  52,914,327	6,499,733	-1.14	h6 Bxh6 gxh6 Ne4 Nh7 Qxd8 Raxd8 Nxd6 Ndf6 Nxb7 Rxd4 Na5 Rc8 Rf3 Ne4 Rf4 Nhg5 Re1 Rd5 b4 Nd6 h4 Nh7 Rd1 e5 Rg4+ Kf8 c4 Nf6 cxd5 Nxg4 dxc6 Ne3 Re1
 25/46	00:10	  66,215,594	6,450,618	-1.06	h6 Bxh6 gxh6 Ne4 Nh7 Qxd8 Bh2+ Kxh2 Raxd8 Nd6 Ndf6 Nxb7 Rxd4 Na5 Rc8 Rf3 Nd5 Bxh7+ Kxh7 Rxf7+ Kg6 Rd7 c5 c3 Re4 Rf1 Rc7 Rxc7 Nxc7 Rf2 Ra4
 26/46	00:23	 146,535,934	6,353,448	-0.57	h6 Bxh6 gxh6 Ne4 Be7 Qxh6 Nxe4 Bxe4 f5 Qxe6+ Kg7 Bxf5 Nf6 Rf4 Rf7 Qe3 Nh7 Raf1 Bd6 Rg4+ Kh8 Rg6 Qf8 Qh6 Qxh6 Rxh6 Bg3 Rf3 Be1 c3 Bd2 Bd3 Re7
 27/50	00:26	 167,477,725	6,317,053	-0.68	h6 Bxh6 gxh6 Ne4 Be7 Qxh6 Nxe4 Bxe4 f5 Qxe6+ Kg7 Bxf5 Nf6 Rf4 Rf7 Qe3 Nh7 Raf1 Bd6 Re4 Kh8 Re6 Bf8 c3 Qg5 Qe4 Nf6 Qe5 Bh6 Bg6 Qxg6 Rexf6 Rxf6 Rxf6
 28/52	00:29	 186,522,843	6,274,315	-0.63	h6 Bxh6 gxh6 Ne4 Be7 Qxh6 Nxe4 Bxe4 f5 Qxe6+ Kg7 Bxf5 Nf6 Rf4 Rf7 Qe3 Nh7 Raf1 Bg5 Qe5+ Kh6 Rg4 Qd5 h4 Qxe5 dxe5 Be3+ Kh2 Rg7 Re4 Bc5 g4 Re7 g5+ Kg7 b4 Bb6 e6 Rd8 Kh3 Nf8 h5 Rd2 h6+ Kg8 g6 Bc7 Kh4 Rh2+ Kg5 Bd8 g7
 29/63	00:34	 213,047,186	6,290,329	-0.71	h6 Bxh6 gxh6 Ne4 Be7 Qxh6 Nxe4 Bxe4 f5 Qxe6+ Kg7 Bxf5 Nf6 Rf4 Rf7 Qe3 Nh7 Raf1 Bg5 Qe5+ Kh6 Rg4 Qe7 Qxe7 Rxe7 h4 Be3+ Kh2 Kh5 Rg6 Nf8 Rg8 Bxd4 Bg4+ Kh6 Rfxf8 Rxf8 Rxf8 Bxb2 Kh3 Kg7 Rd8 Kf6 Rd3 Kg7 Kg3 Kf6 Kf4 Bc1+ Kg3
 30/63	00:58	 373,024,266	6,354,541	-0.76	h6 Bxh6 gxh6 Ne4 Be7 Qxh6 Nxe4 Bxe4 f5 Qxe6+ Kg7 Bxf5 Nf6 Rf4 Rf7 Qe3 Nh7 Raf1 Bd6 Re4 Kh8 Re6 Bf8 c3 Bg7 Bxh7 Rxf1+ Kxf1 Kxh7 Kg1 Qd5 Re7 Rf8 Rxb7 Rf7 Rxf7 Qxf7 Qe4+ Qg6 Qxg6+ Kxg6 Kf2
 31/63	01:14	 473,333,499	6,393,115	-0.54	h6 Bxh6 gxh6 Ne4 Be7 Qxh6 Nxe4 Bxe4 f5 Qxe6+ Kg7 Bxf5 Nf6 Rf4 Rf7 Qe3 Nh7 Raf1 Bd6 Re4 Kh8 Re6 Bf8 c3 Bg7 Bxh7 Rxf1+ Kxf1 Kxh7 Kg1 Qd5 Re7 Rf8 Rxb7 Rf7 Rxf7 Qxf7 b3 Qg6 Qe7 Qb1+ Kh2 Qxa2 Qe4+ Kh8 Qe8+ Kh7
 32/63	01:31	 588,667,752	6,458,585	-0.68	h6 Bxh6 gxh6 Ne4 Be7 Qxh6 Nxe4 Bxe4 f5 Qxe6+ Kg7 Bxf5 Nf6 Rf4 Rf7 Qe3 Nh7 Raf1 Bd6 Re4 Kh8 Re6 Bf8 c3 Qg5 Qe4 Qh5 Rf4 Bh6 Re8+ Nf8 Rxa8 Bxf4 Qxf4 Qxf5 Qxf5 Rxf5 Rxa7 Rf7 g3 Kg7 Kg2 Kg6 h4 Ne6 Kh3 Rh7 g4
 33/63	01:55	 745,685,834	6,485,183	-0.83	h6 Bxh6 gxh6 Ne4 Be7 Qxh6 Nxe4 Bxe4 f5 Qxe6+ Kg7 Bxf5 Nf6 Rf4 Rf7 Qe3 Nh7 Raf1 Bd6 Re4 Kh8 Re6 Bf8 c3 Qg5 Qe4 Qh5 Rf4 Bh6 Re8+ Nf8 Rxa8 Bxf4 Qxf4 Qxf5 Qxf5 Rxf5 Rxa7 Rf7 g3 Kg7 Kg2 Kg6 h4 Nh7 Ra5 Nf6 Rg5+ Kh6 Re5 Kg7 Kh3 Nd5
 34/63	02:23	 931,831,243	6,490,883	-0.97	h6 Bxh6 gxh6 Ne4 Be7 Qxh6 Nxe4 Bxe4 f5 Qxe6+ Kg7 Bxf5 Nf6 Rf4 Rf7 Qe3 Nh7 Raf1 Bd6 Re4 Kh8 Re6 Bf8 Rf4 Rf6 Qe5 Bd6 Rxd6 Qxd6 Qxd6 Rxd6 Rh4 Rf8 Bxh7 Kg7 Bd3 Kf6 Re4 Re6 Rf4+ Ke7 Rxf8 Kxf8 Kf2 Ke7 c3
 35/64	03:27	1,352,789,192	6,535,813	-0.62	h6 Bxh6 gxh6 Ne4 Be7 Qxh6 Nxe4 Bxe4 f5 Qxe6+ Kg7 Bxf5 Nf6 Rf4 Rf7 Qe3 Nh7 Raf1 Bd6 Re4 Kh8 Re6 Bf8 c3 Bg7 Bxh7 Rxf1+ Kxf1 Kxh7 Re7 Qd5 Kg1 Rf8 Rxb7 Rf7 Rxf7 Qxf7 Qe4+ Qg6 Qxg6+ Kxg6 Kf2 Kf5 Kf3 Bh6 b3 Bc1 c4 Bg5 g4+ Ke6 Ke4 Be7 c5 Bf6
 36/64	03:58	1,558,582,779	6,548,061	-0.66	h6 Bxh6 gxh6 Ne4 Be7 Qxh6 Nxe4 Bxe4 f5 Qxe6+ Kg7 Bxf5 Nf6 Rf4 Rf7 Qe3 Nh7 Raf1 Bd6 Re4 Kh8 Re6 Bf8 c3 Bg7 Bxh7 Rxf1+ Kxf1 Kxh7 Re7 Qd5 Kg1 Rf8 Rxb7 Rf7 Rxf7 Qxf7 Qe4+ Qg6 Qxg6+ Kxg6 Kf2 Kf5 Kf3 Bh6 b3 Ke6 Ke4 Bg5 g4 Be7 Kf4
 37/64	05:04	2,001,239,730	6,576,124	-0.60	h6 Bxh6 gxh6 Ne4 Be7 Qxh6 Nxe4 Bxe4 f5 Qxe6+ Kg7 Bxf5 Nf6 Rf4 Rf7 Qe3 Nh7 Raf1 Bd6 Re4 Kh8 Re6 Bf8 c3 Bg7 Bxh7 Rxf1+ Kxf1 Kxh7 Re7 Qd5 Kg1 Rf8 Rxb7 Rf7 Rxf7 Qxf7 Qe4+ Qg6 Qxg6+ Kxg6 Kf2 Bh6 b3 Kf5 Kf3 Bd2 c4 Bg5 g4+ Kf6 Ke4 Ke6 b4 Bd2 a3 Bg5 Kd3
 38/64	06:26	2,546,291,872	6,586,509	-0.41	h6 Bxh6 gxh6 Ne4 Be7 Qxh6 Nxe4 Bxe4 f5 Qxe6+ Kg7 Bxf5 Nf6 Rf4 Rf7 Qe3 Nh7 Raf1 Bd6 Re4 Kh8 Re6 Bf8 c3 Qd5 Re5 Qd6 Bd3 Rxf1+ Kxf1 Bh6 Qe4 Rf8+ Kg1 Rf7 a3 Nf6 Qh4 Ng8 Qh5 Qf6 Re8 Qf4 Kh1 Re7 Rxe7 Nxe7
 39/67	09:49	3,909,617,707	6,632,181	-0.41	h6 Bxh6 gxh6 Ne4 Be7 Qxh6 Nxe4 Bxe4 f5 Qxe6+ Kg7 Bxf5 Nf6 Rf4 Rf7 Qe3 Nh7 Raf1 Bd6 Re4 Kh8 Re6 Bf8 c3 Qd5 Re5 Qd6 g4 Bg7 Re6 Qd5 Re7 Raf8 Rxf7 Qxf7 h4 Qxa2 g5 Qxb2 Qd3 c5 Bxh7 cxd4 Rxf8+ Bxf8 c4 Bc5 Bf5 Bd6 Kf1 Kg7 Qf3 Qc1+ Kg2 Qb2+ Kh3 Qc3 Kg4 Qxf3+ Kxf3 Kf7
 40/70	13:43	5,492,459,827	6,672,959	-0.56	h6 Bxh6 gxh6 Ne4 Be7 Qxh6 Nxe4 Bxe4 f5 Qxe6+ Kg7 Bxf5 Nf6 Rf4 Rf7 Bd3 Qd5 Qe3 Qg5 Raf1 Raf8 h4 Qh6 Qe5 Kh8 g4 Rg7 g5 Qh5 Kg2 Re8 Be2 Qg6 Qf5 Nd5 Re4 Qd6 c4 Rf8 Qe5 Rxf1 Bxf1 Qxe5 Rxe5 Nf4+ Kg3 Ng6 Re4 Nxh4 Kxh4 Bxg5+ Kh5 Kg8 b3 Bf6 Bh3 Kf7 Be6+ Ke7 Bf5+ Kf7
 41/75	17:59	7,254,576,211	6,722,297	-0.64	h6 Bxh6 gxh6 Ne4 Be7 Qxh6 Nxe4 Bxe4 f5 Qxe6+ Kg7 Bxf5 Nf6 Rf4 Rf7 Qe3 Nh7 Raf1 Bd6 Re4 Kh8 Re6 Bf8 c3 Qd5 Re5 Qd6 h4 Bg7 Re6 Qd5 Re8+ Rxe8 Qxe8+ Nf8 g4 Bh6 Qe2 Kg8 b4 Bg7 a3 Bf6 Bd3 Re7 Qf2 Rf7 g5 Bd8 Be4 Qe6 Qxf7+ Qxf7 Rxf7 Kxf7 Kg2 Ne6 Kg3 Kg7 Kg4
 42/75	20:59	8,474,810,186	6,729,880	-0.50	h6 Bxh6 gxh6 Ne4 Be7 Qxh6 Nxe4 Bxe4 f5 Qxe6+ Kg7 Bxf5 Nf6 Rf4 Rf7 Qe3 Nh7 Raf1 Bd6 Re4 Kh8 Re6 Bf8 c3 Qd5 Re5 Qd6 h4 Bg7 Re6 Qd5 Re8+ Rxe8 Qxe8+ Nf8 g4 Bh6 Qe2 Kg8 b4 Bg7 a3 b6 Qd3 c5 dxc5 Qxd3 Bxd3 Rxf1+ Kxf1 bxc5 Bc4+ Kh7 bxc5 Bxc3 c6 Be5 Bd3+ Kg8
 43/75	23:17	9,434,118,010	6,753,552	-0.48	h6 Bxh6 gxh6 Ne4 Be7 Qxh6 Nxe4 Bxe4 f5 Qxe6+ Kg7 Bxf5 Nf6 Rf4 Rf7 Qe3 Nh7 Raf1 Bd6 Re4 Kh8 Re6 Bf8 c3 Qd5 Re5 Qd6 h4 Bg7 Re6 Qd5 Re8+ Rxe8 Qxe8+ Nf8 g4 Bf6 Be4 Qc4 Rf2 Kg8 g5 Be7 Rxf7 Qxf7 Qxf7+ Kxf7 Kf2 Ne6 Ke3 Nxg5 hxg5 Bxg5+ Kd3 Ke6 c4 a5 c5 Bf6 Kc4 Kd7 Bf5+ Kc7 Kd3 Be7 Be4 Bf6
 44/82	31:17	12,736,597,269	6,785,270	-0.47	h6 Bxh6 gxh6 Ne4 Be7 Qxh6 Nxe4 Bxe4 f5 Qxe6+ Kg7 Bxf5 Nf6 Rf4 Rf7 Bd3 Qd5 Qe3 Qg5 Raf1 Raf8 h4 Qh6 Qe5 Kh8 g4 Rg7 g5 Qh5 Kg2 Rfg8 Qe2 Rxg5+ hxg5 Qxg5+ Kh1 Qh6+ Qh2 Nh5 R4f3 Bd6 Qh3 Rg3 Rxg3 Nxg3+ Kg2 Qxh3+ Kxh3 Nxf1 Bxf1 Kg7 Kg4 Kf6 Bg2 Bf8 Kf4 Bh6+ Ke4 Bc1 b3 Ke6 c4 Kd6 c5+ Kc7 Kd3 Ba3 Kc4 b5+ Kd3 a5 Ke4 Bb4 Kf4 Kd7 Ke5 Bc3 Be4
 45/87	46:49	19,170,500,700	6,824,272	-0.53	h6 Bxh6 gxh6 Ne4 Be7 Qxh6 Nxe4 Bxe4 f5 Qxe6+ Kg7 Bxf5 Nf6 Rf4 Rf7 Bd3 Qd5 Qe3 Qg5 Raf1 Raf8 h4 Qh6 Qe5 Kh8 g4 Rg7 g5 Qh5 Be2 Qg6 c3 Nd7 Rxf8+ Bxf8 Qf5 Qe8 Bc4 Bd6 Qf3 Rh7 Qg4 Nb6 Bb3 Nd5 g6 Qe3+ Kh1 Re7 Qh5+ Kg8 Bxd5+ cxd5 Qxd5+ Qe6 Qxe6+ Rxe6 Rf7 Rxg6
 46/87	53:11	21,788,762,552	6,828,121	-0.54	h6 Bxh6 gxh6 Ne4 Be7 Qxh6 Nxe4 Bxe4 f5 Qxe6+ Kg7 Bxf5 Nf6 Rf4 Rf7 Bd3 Qd5 Qe3 Qg5 Raf1 Raf8 h4 Qh6 Qe5 Kh8 g4 Rg7 g5 Qh5 Be2 Qg6 c3 Nd7 Rxf8+ Bxf8 Qf5 Qxf5 Rxf5 Bd6 Kf2 Nb6 c4 Bb4 b3 Nd7 Ke3 Be1 h5 Bh4 Kf4 Re7 Bf3 Bf2 d5 Be3+ Kg3 cxd5 cxd5 Re5 Rxe5 Nxe5 d6
SF clinging to h6.
Of course, it is possible that there is no better alternative.
Taking ideas is not a vice, it is a virtue. We have another word for this. It is called learning.
But sharing ideas is an even greater virtue. We have another word for this. It is called teaching.
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peter
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Full name: Peter Martan

Re: am = h6, but what is bm?

Post by peter »

Dann Corbit wrote: Of course, it is possible that there is no better alternative.
Guess you're right, Dann
Peter.
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Dann Corbit
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Re: am = h6, but what is bm?

Post by Dann Corbit »

peter wrote:
Dann Corbit wrote: Of course, it is possible that there is no better alternative.
Guess you're right, Dann
I have that position in a list of positions that are getting a 5 hour pounding over the weekend.

So we will see if something turns over in the night.
Taking ideas is not a vice, it is a virtue. We have another word for this. It is called learning.
But sharing ideas is an even greater virtue. We have another word for this. It is called teaching.
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elpapa
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Full name: Patrik Karlsson

Re: am = h6, but what is bm?

Post by elpapa »

SF 160827, multi-pv 4, depth 32:

h6: -0.62
h5: -1.56
Re8: -2.74
Qb6: -5.27

Edit:
And after ...h5, depth 38:

Ne4: +2.06 for white
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elpapa
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Full name: Patrik Karlsson

Re: am = h6, but what is bm?

Post by elpapa »

To late to edit, after ...h6, depth 38:

Bxh6: +0.44 for white
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Eelco de Groot
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Re: am = h6, but what is bm?

Post by Eelco de Groot »

elpapa wrote:To late to edit, after ...h6, depth 38:

Bxh6: +0.44 for white
It is a nice example for Henk that if attacked on the flank, you should seek a counterattack through the center. Rasmus Althoff nicely summed up the argument, worth rereading.

Here it seems that Black sort of has to ignore the bishop, because it is poisoned and instead move a Rook on the centerfile because White's d5 pawn is undefended and undefendable. The attack through the center is extra strong here. White can retract the Bishop so then gets the pawn on h6 for free, but loses d5 or try to do something about the rook on d8. The last variation is the main line:

[Event "?"]
[Site "?"]
[Date "2016.09.24"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "2r2rk1/1bq1bppp/p4n2/np1P2B1/3p4/5N1P/PP3PP1/RB1QRNK1 b - -"]

1... h6 2. Bxh6 Rfd8 3. Bf5 gxh6 4. Bxc8 Rxc8 5. Qxd4 Bxd5
6. Rac1 Nc6 7. Qh4 Bxf3 8. gxf3 Nd5 9. Qxh6 Qd6 10. Qh5
Qg6+ 11. Qxg6+ fxg6 12. Re6 Ndb4 $15 {[D]2r3k1/4b3/p1n1R1p1/1p6/1n6/5P1P/PP3P2/2R2NK1 w - - (12... Ncb4? 13. Rxc8 1-0)} *
Debugging is twice as hard as writing the code in the first
place. Therefore, if you write the code as cleverly as possible, you
are, by definition, not smart enough to debug it.
-- Brian W. Kernighan
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tpoppins
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Location: upstate

Re: am = h6, but what is bm?

Post by tpoppins »

Eelco, you looked at the wrong position; the position discussed in this thread is in the first post.

[d]r2q1rk1/pp1n1ppp/2pbpn2/6B1/3P3Q/2NB3P/PPP3P1/R4RK1 b – – 0 12
Diemer-Markus, 1974

There can be no doubt that 12...h6 is the only move in this position. Anyone can see that White is threatening mate in three, against which Black has three plausible replies:

12...g6 - drops a piece
12...h5 - drops a pawn and eventually another while exposing the black king

That leaves only 12...h6. Black gets a piece and an exposed king for three pawns; White gets a dangerous-looking attack that doesn't seem to be enough for a win, though.

Code: Select all

Analysis by Komodo 10.1 64-bit:

1. +/= (0.35): 12...h6 13.Bxh6 gxh6 14.Ne4 Be7 15.Rf3 Nxe4 16.Qxe4 f5 17.Qxe6+ Kg7 18.Bxf5 Rf6 19.Qxd7 Qxd7 20.Bxd7 Rxf3 21.gxf3 Rd8 22.Bf5 Rxd4 23.Re1 Kf6 24.Bd3 a5 25.Kf2 a4 26.b3 h5 27.Ke3 Rh4 28.Rh1 Bc5+ 29.Ke2 Kg5 30.Be4 axb3 31.axb3 Rf4 32.Rb1 Rf6 33.b4 Bd4 34.b5 Rd6 35.Rb4 c5 36.Ra4 b6 37.Bc6 Kf5 38.h4 Re6+ 39.Kd2 Re3 40.Ra6 Kf4 41.Ra4 
2. +- (1.81): 12...h5 13.Ne4 Be7 14.Rf2 Nd5 15.Qxh5 f5 16.Bxe7 Qxe7 17.Ng5 N7f6 18.Qh4 Nc7 19.Bc4 g6 20.Nxe6 Nxe6 21.Re1 Qh7 22.Bxe6+ Kh8 23.Qf4 Rae8 24.c3 Qh5 25.Rfe2 Ne4 26.Bd7 Rd8 27.Qe5+ Nf6 28.Be6 Rde8 29.c4 Kg7 30.g4 Qg5 31.Kh1 Rxe6 32.Qxe6 Qh4 33.gxf5 Re8 34.Qd6 Qxh3+ 35.Qh2 Rxe2 36.Qxh3 Rxe1+ 37.Kg2 Re4 38.Qb3 b5 39.fxg6 Kxg6 40.cxb5 cxb5 41.d5 Rd4 42.d6 Rd5 43.Qe3 Kf5 
Depth: 46   06:28:22  355090MN
Walking Komodo manually through the PV helps it realize that SF's (and the German blog's) choice of 15.Qxh6 is superior to 15.Rf3; the eval starts growing in White's favor. As Komodo looks deeper into the forced line that follows its enthusiasm dampens considerably:

[d]r2q1r2/pp2b1k1/2p1Qn2/5B2/3P1R2/7P/PPP3P1/R5K1 b - - 0 19
This position arises after 12... h6 13. Bxh6 gxh6 14. Ne4 (14.Qxh6 Re8 and 15...Bf8 promises even less) Be7 15. Qxh6 Nxe4 16. Bxe4 f5 17. Qxe6+ Kg7 18. Bxf5 (Prof Eingenmann's line ends here with the clearly over-optimistic "mit starkem Angriff") 18... Nf6 (otherwise White regains his piece with 19.Qxd7) 19. Rf4

Code: Select all

Analysis by Komodo 10.1 64-bit:

19...Rf7 20.Bd3 Qd5 21.Qe3 Qg5 22.Raf1 Raf8 23.h4 Qh6 24.Qe5 Kh8 25.g4 Rg7 26.g5 Qh5 27.Be2 Qg6 28.c3 c5 29.Kg2 cxd4 30.cxd4 a6 31.Rf5 Nd7 32.Qd5 Rxf5 33.Rxf5 Nf8 34.Bc4 Qb6 35.Rf2 Ng6 36.Qe4 Rh7 37.Bd3 Rxh4 38.Qxg6 Qxg6 39.Bxg6 Rxd4 40.Rf7 Bxg5 41.Rxb7 Rd2+ 42.Kf3 Bf6 43.b3 Rxa2 44.Bd3 Rh2 45.Bc4 Rh3+ 46.Ke4 Rg3 47.Bxa6 
  +/= (0.44)  Depth: 41   00:36:01  32527MN, tb=1037691
Black can hold, 12...h6 is the only move. It's a case of a bad example of the "h6 Syndrome".
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Dann Corbit
Posts: 12540
Joined: Wed Mar 08, 2006 8:57 pm
Location: Redmond, WA USA

Re: am = h6, but what is bm?

Post by Dann Corbit »

I agree.
I got this after 51 plies:

[d]r2q1rk1/pp1n1ppp/2pbpn2/6B1/3P3Q/2NB3P/PPP3P1/R4RK1 b - - acd 51; acs 15660; bm h6; ce -36; pm h6; pv h6 Bxh6 gxh6 Ne4 Be7 Rf3 Nxe4 Qxe4 f5 Qxe6+ Kg7 Bxf5 Rf6 Qxd7 Qxd7 Bxd7 Rxf3 gxf3 Rd8 Bf5 Rxd4 Re1 Bc5 Kf1 Rd2 Re2 Rd1+ Kg2 Rg1+ Kh2 Rg5 Bc8 Bd6+ Kh1 b6 c3 Rg3 Rd2 Be5 Rd7+ Kf8 Rxa7 Rxf3 Rb7 b5 Bd7 Rf2 Bxc6 Rh2+ Kg1 Rxb2 a4 Bxc3 axb5 Bd4+ Kf1 Rf2+ Ke1 Rh2;
Taking ideas is not a vice, it is a virtue. We have another word for this. It is called learning.
But sharing ideas is an even greater virtue. We have another word for this. It is called teaching.
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