Mate score reporting problem (Critter 1.6a)

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MOBMAT
Posts: 165
Joined: Sat Feb 04, 2017 10:57 pm
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Mate score reporting problem (Critter 1.6a)

Post by MOBMAT » Tue Nov 19, 2019 7:10 pm

Critter 1.6a chomped on this mate in 9 position and reported mate in 6 . Why does it get confused?



Configuration:
MS Win 10 Home
Processor Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz, 4000 Mhz, 4 Core(s), 8 Logical Processor(s)
Engine set to 4 threads, EGTBs enabled, 8192MB hash

Code: Select all

E:\Chess\Arena\TestSuites\M09-Test.epd  Position 20 / 28 Qe3-d4
FEN: 8/2p1N1k1/1r2q3/6Pp/p1p5/4Q2P/2P5/5RK1 w - - 0 38

Critter 1.6a:
 8-	00:00	 8k	2,086k	+16.46	38.Qd4+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kf2 a3 42.Qxc4 c6
 8-	00:00	 9k	2,249k	+14.82	38.Qd4+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kf2 a3 42.Qxc4 c6
 8	00:00	 12k	1,935k	+8.70	38.Qd4+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kf2 a3 42.Qxc4 c6
 9+	00:00	 28k	2,501k	+9.24	38.Qd4+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kf2 a3 42.Qxc4 c6 43.Qf4
 9	00:00	 30k	2,705k	+8.59	38.Qd4+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kf2 a3 42.Qxc4 c6 43.Qf4
 9+	00:00	 42k	3,030k	+10.05	38.Qc3+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kh2 Rg7 42.Qxc4
 9	00:00	 56k	3,313k	+10.29	38.Qc3+ Kh7 39.g6+ Kh6 40.g7 Qg6+ 41.Nxg6 Rxg6+ 42.Kh2 Rxg7 43.Qe3+ Kh7 44.Qe4+ Kg8 45.Qxc4+ Kh7 46.Qxa4
 10+	00:00	 81k	3,671k	+10.93	38.Qc3+ Kh7 39.g6+ Kh6 40.g7 Qg6+ 41.Nxg6 Rxg6+ 42.Kh2 Rxg7 43.Qe3+ Kh7 44.Qe4+ Kg8 45.Qxc4+ Kh7 46.Qxa4
 10-	00:00	 114k	3,916k	+9.65	38.Qc3+ Kh7 39.g6+ Kh6 40.g7 Qg6+ 41.Nxg6 Rxg6+ 42.Kh2 Rxg7 43.Qe3+ Kh7 44.Qe4+ Kg8 45.Qxc4+ Kh7 46.Qxa4
 10	00:00	 117k	4,022k	+8.87	38.Qc3+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kh2 Rg7 42.Qxc4
 11+	00:00	 130k	4,071k	+9.42	38.Qc3+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kh2 Rg7 42.Qxc4
 11+	00:00	 138k	4,173k	+10.24	38.Qc3+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kh2 Rg7 42.Qxc4
 11	00:00	 148k	4,218k	+9.39	38.Qc3+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kh2 Rg7 42.Qxc4
 12+	00:00	 183k	4,566k	+9.97	38.Qc3+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kh2 Rg7 42.Qxc4
 12+	00:00	 213k	4,736k	+10.85	38.Qc3+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kh2 Rg7 42.Qxc4
 12	00:00	 245k	5,000k	+12.16	38.Qc3+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kh2 Rg7 42.Qxc4
 13	00:00	 320k	5,513k	+12.92	38.Qc3+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kh2 Rg7 42.Qxc4
 14	00:00	 396k	5,829k	+12.92	38.Qc3+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kh2 Rg7 42.Qxc4
 15+	00:00	 982k	8,114k	+13.72	38.Qc3+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kh2 Rg7 42.Qxc4
 15	00:00	 1,657k	9,307k	+14.92	38.Qc3+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kh2 Rg7 42.Qxc4 a3 43.Qd3+ Kg8 44.Qxa3
 16	00:00	 2,322k	9,715k	+15.85	38.Qc3+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kh2 Rg7 42.Qxc4 a3 43.Qd3+ Kg8 44.Qxa3
 16+	00:00	 2,594k	9,716k	+15.85	38.Qd4+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kf2 a3 42.Qxc4 c6 43.Qf4
 16+	00:00	 7,917k	10,801k	+22.47	38.Qd4+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kf2 a3 42.Qxc4 c6 43.Qf4
 16	00:01	 19,864k	11,319k	+15.85	38.Qc3+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kh2 Rg7 42.Qxc4 a3 43.Qd3+ Kg8 44.Qxa3
 17+	00:01	 21,677k	11,220k	+16.84	38.Qc3+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kh2 Rg7 42.Qxc4 a3 43.Qd3+ Kg8 44.Qxa3
 17+	00:02	 23,860k	11,170k	+18.32	38.Qc3+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kh2 Rg7 42.Qxc4 a3 43.Qd3+ Kg8 44.Qxa3
 17	00:02	 26,392k	11,071k	+23.86	38.Qc3+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kh2 Rg7 42.Qxc4 a3 43.Qd3+ Kg8 44.Qxa3
 18	00:03	 44,286k	11,611k	+M20	38.Qc3+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kh2 Rg7 42.Qxc4 a3 43.Qd3+ Kg8 44.Qxa3
 19	00:06	 84,539k	12,087k	+M13	38.Qc3+ Kh7 39.g6+ Kh6 40.Qd2+ Kg7 41.Nf5+ Kxg6 42.Qh6+ Kf7 43.Qh7+ Ke8 44.Ng7+ Ke7 45.Nxe6+ Kxe6 46.Qe4+ Kd6 47.Qd4+ Ke7 48.Re1+ Kf8 49.Qxc4
 20	00:07	 89,256k	12,098k	+M10	38.Qc3+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kh2 Rg7 42.Qxc4 a3 43.Qd3+ Kg8 44.Qxa3 Kh7 45.Qd3+ Kh8
 21	00:07	 93,227k	12,191k	+M10	38.Qc3+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kh2 Rg7 42.Qxc4 a3 43.Qd3+ Kg8 44.Qxa3 Kh7 45.Qd3+ Kh8
 21	00:07	 96,717k	12,115k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 22	00:08	 97,607k	12,127k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 23	00:08	 98,898k	12,162k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 24	00:08	 100,749k	12,214k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 25	00:08	 103,501k	12,300k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 26	00:08	 107,599k	12,423k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 27	00:08	 112,560k	12,563k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 28	00:09	 118,225k	12,703k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 29	00:09	 125,828k	12,866k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 30	00:10	 134,675k	13,075k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 31	00:11	 146,863k	13,345k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 32	00:11	 162,424k	13,627k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 33	00:12	 178,731k	13,866k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 34	00:14	 202,233k	14,101k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 35	00:15	 224,195k	14,337k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 36	00:16	 247,320k	14,549k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 37	00:18	 272,001k	14,731k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 38	00:20	 299,547k	14,930k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 39	00:22	 333,225k	15,125k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 40	00:24	 367,768k	15,287k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 41	00:26	 402,807k	15,416k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 42	00:28	 447,706k	15,513k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 43	00:31	 495,917k	15,585k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 44	00:35	 559,189k	15,549k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 45	00:43	 661,954k	15,344k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 46	00:50	 769,430k	15,180k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 47	00:59	 894,675k	15,029k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 48	01:10	 1,056,120k	14,916k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 49	03:38	 3,183,799k	14,594k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 50	04:11	 3,640,965k	14,492k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 51	04:37	 4,009,176k	14,462k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 52	06:29	 5,572,472k	14,306k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+

Vince S
Author of MOBMAT

"Reductions, extensions, and pruning, oh my!"

User avatar
Ajedrecista
Posts: 1423
Joined: Wed Jul 13, 2011 7:04 pm
Location: Madrid, Spain.
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Re: Mate score reporting problem (Critter 1.6a).

Post by Ajedrecista » Tue Nov 19, 2019 7:38 pm

Hello:
MOBMAT wrote:
Tue Nov 19, 2019 7:10 pm
Critter 1.6a chomped on this mate in 9 position and reported mate in 6 . Why does it get confused?



Configuration:
MS Win 10 Home
Processor Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz, 4000 Mhz, 4 Core(s), 8 Logical Processor(s)
Engine set to 4 threads, EGTBs enabled, 8192MB hash

Code: Select all

E:\Chess\Arena\TestSuites\M09-Test.epd  Position 20 / 28 Qe3-d4
FEN: 8/2p1N1k1/1r2q3/6Pp/p1p5/4Q2P/2P5/5RK1 w - - 0 38

Critter 1.6a:
 8-	00:00	 8k	2,086k	+16.46	38.Qd4+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kf2 a3 42.Qxc4 c6
 8-	00:00	 9k	2,249k	+14.82	38.Qd4+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kf2 a3 42.Qxc4 c6
 8	00:00	 12k	1,935k	+8.70	38.Qd4+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kf2 a3 42.Qxc4 c6
 9+	00:00	 28k	2,501k	+9.24	38.Qd4+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kf2 a3 42.Qxc4 c6 43.Qf4
 9	00:00	 30k	2,705k	+8.59	38.Qd4+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kf2 a3 42.Qxc4 c6 43.Qf4
 9+	00:00	 42k	3,030k	+10.05	38.Qc3+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kh2 Rg7 42.Qxc4
 9	00:00	 56k	3,313k	+10.29	38.Qc3+ Kh7 39.g6+ Kh6 40.g7 Qg6+ 41.Nxg6 Rxg6+ 42.Kh2 Rxg7 43.Qe3+ Kh7 44.Qe4+ Kg8 45.Qxc4+ Kh7 46.Qxa4
 10+	00:00	 81k	3,671k	+10.93	38.Qc3+ Kh7 39.g6+ Kh6 40.g7 Qg6+ 41.Nxg6 Rxg6+ 42.Kh2 Rxg7 43.Qe3+ Kh7 44.Qe4+ Kg8 45.Qxc4+ Kh7 46.Qxa4
 10-	00:00	 114k	3,916k	+9.65	38.Qc3+ Kh7 39.g6+ Kh6 40.g7 Qg6+ 41.Nxg6 Rxg6+ 42.Kh2 Rxg7 43.Qe3+ Kh7 44.Qe4+ Kg8 45.Qxc4+ Kh7 46.Qxa4
 10	00:00	 117k	4,022k	+8.87	38.Qc3+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kh2 Rg7 42.Qxc4
 11+	00:00	 130k	4,071k	+9.42	38.Qc3+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kh2 Rg7 42.Qxc4
 11+	00:00	 138k	4,173k	+10.24	38.Qc3+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kh2 Rg7 42.Qxc4
 11	00:00	 148k	4,218k	+9.39	38.Qc3+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kh2 Rg7 42.Qxc4
 12+	00:00	 183k	4,566k	+9.97	38.Qc3+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kh2 Rg7 42.Qxc4
 12+	00:00	 213k	4,736k	+10.85	38.Qc3+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kh2 Rg7 42.Qxc4
 12	00:00	 245k	5,000k	+12.16	38.Qc3+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kh2 Rg7 42.Qxc4
 13	00:00	 320k	5,513k	+12.92	38.Qc3+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kh2 Rg7 42.Qxc4
 14	00:00	 396k	5,829k	+12.92	38.Qc3+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kh2 Rg7 42.Qxc4
 15+	00:00	 982k	8,114k	+13.72	38.Qc3+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kh2 Rg7 42.Qxc4
 15	00:00	 1,657k	9,307k	+14.92	38.Qc3+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kh2 Rg7 42.Qxc4 a3 43.Qd3+ Kg8 44.Qxa3
 16	00:00	 2,322k	9,715k	+15.85	38.Qc3+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kh2 Rg7 42.Qxc4 a3 43.Qd3+ Kg8 44.Qxa3
 16+	00:00	 2,594k	9,716k	+15.85	38.Qd4+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kf2 a3 42.Qxc4 c6 43.Qf4
 16+	00:00	 7,917k	10,801k	+22.47	38.Qd4+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kf2 a3 42.Qxc4 c6 43.Qf4
 16	00:01	 19,864k	11,319k	+15.85	38.Qc3+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kh2 Rg7 42.Qxc4 a3 43.Qd3+ Kg8 44.Qxa3
 17+	00:01	 21,677k	11,220k	+16.84	38.Qc3+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kh2 Rg7 42.Qxc4 a3 43.Qd3+ Kg8 44.Qxa3
 17+	00:02	 23,860k	11,170k	+18.32	38.Qc3+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kh2 Rg7 42.Qxc4 a3 43.Qd3+ Kg8 44.Qxa3
 17	00:02	 26,392k	11,071k	+23.86	38.Qc3+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kh2 Rg7 42.Qxc4 a3 43.Qd3+ Kg8 44.Qxa3
 18	00:03	 44,286k	11,611k	+M20	38.Qc3+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kh2 Rg7 42.Qxc4 a3 43.Qd3+ Kg8 44.Qxa3
 19	00:06	 84,539k	12,087k	+M13	38.Qc3+ Kh7 39.g6+ Kh6 40.Qd2+ Kg7 41.Nf5+ Kxg6 42.Qh6+ Kf7 43.Qh7+ Ke8 44.Ng7+ Ke7 45.Nxe6+ Kxe6 46.Qe4+ Kd6 47.Qd4+ Ke7 48.Re1+ Kf8 49.Qxc4
 20	00:07	 89,256k	12,098k	+M10	38.Qc3+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kh2 Rg7 42.Qxc4 a3 43.Qd3+ Kg8 44.Qxa3 Kh7 45.Qd3+ Kh8
 21	00:07	 93,227k	12,191k	+M10	38.Qc3+ Kh7 39.g6+ Qxg6+ 40.Nxg6 Rxg6+ 41.Kh2 Rg7 42.Qxc4 a3 43.Qd3+ Kg8 44.Qxa3 Kh7 45.Qd3+ Kh8
 21	00:07	 96,717k	12,115k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 22	00:08	 97,607k	12,127k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 23	00:08	 98,898k	12,162k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 24	00:08	 100,749k	12,214k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 25	00:08	 103,501k	12,300k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 26	00:08	 107,599k	12,423k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 27	00:08	 112,560k	12,563k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 28	00:09	 118,225k	12,703k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 29	00:09	 125,828k	12,866k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 30	00:10	 134,675k	13,075k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 31	00:11	 146,863k	13,345k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 32	00:11	 162,424k	13,627k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 33	00:12	 178,731k	13,866k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 34	00:14	 202,233k	14,101k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 35	00:15	 224,195k	14,337k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 36	00:16	 247,320k	14,549k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 37	00:18	 272,001k	14,731k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 38	00:20	 299,547k	14,930k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 39	00:22	 333,225k	15,125k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 40	00:24	 367,768k	15,287k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 41	00:26	 402,807k	15,416k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 42	00:28	 447,706k	15,513k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 43	00:31	 495,917k	15,585k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 44	00:35	 559,189k	15,549k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 45	00:43	 661,954k	15,344k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 46	00:50	 769,430k	15,180k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 47	00:59	 894,675k	15,029k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 48	01:10	 1,056,120k	14,916k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 49	03:38	 3,183,799k	14,594k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 50	04:11	 3,640,965k	14,492k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 51	04:37	 4,009,176k	14,462k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+
 52	06:29	 5,572,472k	14,306k	+M6	38.Qd4+ Qf6 39.gxf6+ Kf7 40.Qd5+ Re6 41.Qxh5+ Kf8 42.Qh8+ Kf7 43.Qg8+

Same here using Windows 32-bit version, 2 cores and Gaviota EGTB up to 5 pieces under Arena 2.0.1 GUI. Checkmate in 6 is reported with EGTB enabled and disabled with Critter 1.6a and Critter 1.6, hash cleared after each try. However, Critter 1.4 is right (checkmate in 9).

More intriguing is that analysing with single core, Critter 1.6a shows the correct result, the checkmate in 9, with EGTB either enabled and disabled. As a non-programmer, could it be a faulty SMP implementation of something?

Regards from Spain.

Ajedrecista.

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