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H. G. Muller wrote on Sun, Feb 16, 2020 02:55 PM UTC:

I presented the position to ChessV 2.2RC1, and after 5 min (the time it reports itself is bogus!) it produced a move at 32 ply: 

dep	score	nodes	time	(not shown:  tbhits	knps	seldep)
32	+169.59 	106.2M	8:50:53	f2f3 f5e5 d4d1 e5e6 f3f4 e6f6 d1e1 f6g6 f4g4 g6f6 g4f3
31	+169.59 	45.1M  	3:35:35	f2e3 f5f6 e3e4 f6g5 d4d3
30	+169.58 	28.1M  	2:11:14	f2e3 f5e5 d4d3 e5f5 e3d4 f5f6 d4e4 f6e6 d3d5
29	+169.55 	19.1M  	1:25:46	f2e3 f5e5 d4d1 e5f5 d1d5 f5f6 e3e4 f6e6 d5d2 e6f6 d2a2 f6e7 e4e5 e7d7 e5d5 d7e7 a2a5 e7f7 a5a3 f7f8 a3a7 f8g8 d5d6 g8f8 a7b7 f8g8
28	+169.55 	15.9M  	1:08:52	f2e3 f5e5 d4d1 e5f5 d1d5 f5f6 e3e4 f6e6 d5d2 e6f6
27	+169.55 	13.3M  	56:28.33	f2e3 f5e5 d4d1 e5f6 e3e4 f6e6 e4f4 e6f6 d1d6 f6e7 f4e5 e7f7 e5e4 f7e7
26	+169.55 	11.1M  	46:51.12	f2e3 f5e5 d4d1 e5f6 e3e4 f6e6 e4f4 e6f6 d1d6 f6e7 f4e5 e7f7 e5e4 f7e7
25	+169.55 	8.86M  	37:24.84	f2e3 f5e5 d4d1 e5f6 e3e4 f6e6 e4f4 e6f6 d1d6 f6e7 f4e5 e7f7 e5e4 f7e7
24	+169.55 	6.49M  	27:22.68	f2e3 f5e5 d4d1 e5f6 e3e4 f6e6 e4f4 e6f6 d1d6 f6e7 f4e5 e7f7 e5e4 f7e7 e4d5 e7f8 d6e6 f8f7 e6e1 f7f8
23	+169.55 	5.23M  	22:09.12	f2e3 f5e5 d4d1 e5f6 e3e4 f6e6 e4f4 e6f7 f4f5 f7e7 d1d2 e7f7 d2d8 f7e7 d8d5 e7f8 f5e5 f8f7
22	+169.55 	3.91M  	16:38.40	f2e3 f5e5 d4d1 e5f6 e3e4 f6e6 e4f4 e6f7 f4f5 f7e7 d1d2 e7f7 d2d8 f7e7 d8d5 e7f8 f5e5 f8f7
21	+169.55 	2.79M  	12:06.96	f2e3 f5e5 d4d1 e5f6 e3e4 f6e6 e4f4 e6f7 f4f5 f7e7 d1d2 e7f7 d2d8 f7e7 d8d5 e7f8
20	+169.55 	2.39M  	10:25.56	f2e3 f5e5 d4d1 e5f6 e3e4 f6e6 e4f4 e6f7 f4f5 f7e7 d1d2 e7f8 d2d8 f8f7 d8d5 f7e7 d5d3 e7f8 d3d6 f8f7 d6e6
19	+57.24 	1.85M  	8:09.84	f2e3 f5e5 d4d1 e5f6 e3e4 f6e6 e4f4 e6f7 f4f5 f7e7 d1d2
18	+169.56 	1.42M  	6:22.20	f2e3
17	+169.56 	1.13M  	5:12.00	f2e3
16	+169.56 	895583	4:14.28	f2e3 f5e5 d4d1 e5f6 e3e4 f6e6 e4f4 e6f7 f4f5 f7e7 d1d2 e7f8 d2d8 f8f7 d8d5 f7e7 d5d3
15	+57.24 	696806	3:22.80	f2e3 f5e5 d4d2 e5f6 e3e4 f6e6 d2d5 e6f7 e4f5 f7e7 d5d3
14	+57.04 	435297	2:11.04	f2f3 f5e5 f3e3 e5f6 e3f4 f6e6 d4d3 e6e7 f4f5 e7f7 d3d7 f7e8 f5e6 e8f8 e6d6
13	+56.96 	285881	1:27.36	f2f3 f5e5 d4d3 e5f6 f3f4 f6e6 d3d4 e6e7 f4e5 e7f7 e5f5 f7e7 d4d5
12	+56.88 	187028	0:57.72	f2e3 f5e5 d4d3 e5f6 e3e4 f6e6 e4f4 e6e7 f4e5 e7f7 d3d7 f7g6 e5f4
11	+56.80 	115957	0:34.32	f2f3 f5e5 f3e3 e5f6 e3e4 f6e6 d4d5 e6e7 e4e5 e7e8 e5e6
10	+56.72 	68603  	0:20.28	f2f3 f5e5 f3e3 e5f6 e3e4 f6e6 e4f4 e6e7 f4e5 e7e8
9	+56.72 	39705  	0:12.48	f2f3 f5e5 f3e3 e5f6 e3e4 f6e6 e4f4 e6e7 f4e5
8	+56.64 	23739  	0:07.80	f2f3 f5e5 f3e3 e5f6 e3e4 f6e6 d4c4 e6d6
7	+56.64 	12952  	0:04.68	f2f3 f5e5 f3e3 e5f6 e3e4 f6e6 d4c4
6	+56.64 	5601    	0:03.12	f2f3 f5e5 f3e3 e5e6 e3e4 e6e7
5	+56.64 	2579    	0:01.56	f2f3 f5e5 f3e3 e5e6 e3e4
4	+56.52 	1034    	0:01.56	f2f3 f5e5 f3e3 e5e6
3	+56.56 	418      	0:01.56	f2f3 f5e5 f3e3
2	+56.52 	121      	0:01.56	f2f3 f5e6
1	+56.64 	28        	0:01.56	f2f3
0	#

So like micro-Max it finds a mate score pretty fast; difference is that it seems to be that the pretty slow over-the-horizon mate it finds first isn't improved as much as the depth goes up. Still it is strange that it wouldn't simply play out the mating line it found, and is now in its TT, in the following moves.

[Edit] Umm, I might misinterpret the 169.xx scores as mate scores: when I let ChessV play out this position against itself there do appear standard mate scores at the end. Strange thing is that after the black engine admits to being 'mated-in-1' is its last move, the white engine crashes without performing the checkmate.


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