A practical position in a computer game

[Look]

This one quickly shows a draw for me:
[d]1r1q4/5rk1/1bBp2p1/1P1N3p/P3Pp1P/5K1Q/5P2/5R2 b - - 3 21

[Look]

This time white has an extra rook for five pawns:

[d]2r5/6p1/kp2p2p/pn1p1p1P/2pq1B2/5PP1/1RR3K1/Q7 w - - 1 43

[Peter Berger]

(All this with one thread. I am doing some troubleshooting for an unrelated post from Peter Berger in the Pro Deo forum who is using Rebel EAS in Chessbase with four threads. I think Rebel can actually only do two threads when you set it to four but not 100% sure. Chris does not recommend more than one thread for his program he posted in the past.)

You could have told me.

[acase]

This time white has an extra rook for five pawns:

[d]2r5/6p1/kp2p2p/pn1p1p1P/2pq1B2/5PP1/1RR3K1/Q7 w - - 1 43

It looks like on this one that White can win. ShashChess is showing a score that is continuously climbing after almost 26 minutes:

Code: Select all

FEN: 2r5/6p1/kp2p2p/pn1p1p1P/2pq1B2/5PP1/1RR3K1/Q7 w - - 1 43

ShashChess33.1-x86-64-bmi2:
NNUE evaluation using nn-5af11540bbfe.nnue enabled
 1/1	00:00	 713	357k	+1.09	43.Rc2-d2
 2/2	00:00	 2k	1,192k	+1.09	43.Rc2-d2 Qd4-c5
 3/4	00:00	 5k	2,642k	+1.11	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Qc5-e7
 4/5	00:00	 8k	3,914k	+1.07	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Qc5-e7 45.Rd2-d1
 5/6	00:00	 11k	5,379k	+1.07	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Rc8-c6 45.Be5xg7 c4-c3
 6/7	00:00	 13k	6,399k	+1.07	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Rc8-c6 45.Be5xg7 c4-c3 46.Rb2xb5 Ka6xb5
 7/9	00:00	 17k	8,744k	+1.07	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Rc8-c6 45.Be5xg7 c4-c3 46.Rb2xb5 Ka6xb5 47.Rd2-d3
 8/9	00:00	 24k	8,046k	+1.09	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Rc8-c6 45.Be5xg7 c4-c3 46.Rb2xb5 Ka6xb5
 9/15	00:00	 112k	14,025k	+1.12	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Qc5-e3 45.Rd2-e2 Qe3-c5 46.Be5xg7 c4-c3 47.Rb2-a2 Qc5-c6 48.Re2-e5
 10/12	00:00	 117k	13,039k	+1.12	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Qc5-e3 45.Rd2-e2 Qe3-c5 46.Be5xg7 c4-c3 47.Rb2-a2 Qc5-c6 48.Re2-e5 d5-d4
 11/15	00:00	 201k	14,358k	+1.12	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Rc8-c6 45.Be5xg7 c4-c3 46.Rb2xb5 Ka6xb5
 12/21	00:00	 507k	12,681k	+1.11	43.Rc2-d2 Qd4-c5 44.Bf4-e5 f5-f4 45.g3xf4 Rc8-c6 46.Qa1-d1 Qc5-f8 47.Qd1-c2 Qf8-f7 48.Rd2-d1 c4-c3 49.Rb2xb5 Ka6xb5
 13/23	00:00	 621k	12,427k	+1.07	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Qc5-c6 45.Qa1-f1 Qc6-d7 46.Rb2-b1 Rc8-c5 47.Rd2-b2 Ka6-a7 48.Rb2xb5 Rc5xb5 49.Rb1xb5 Qd7xb5 50.Be5xg7 a5-a4 51.Qf1-c1 Qb5-b3 52.Qc1xh6 c4-c3 53.Qh6-f4 Qb3-a2+ 54.Kg2-h3
 14/23	00:00	 1,070k	12,439k	+1.10	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Qc5-e3 45.Rd2-e2 Qe3-d3 46.Qa1-e1 c4-c3 47.Rb2-b1 f5-f4 48.Be5xf4 Nb5-d4 49.Re2-e3 Qd3-c2+ 50.Kg2-g1 Ka6-b7 51.Bf4-e5
 15/25	00:00	 1,271k	12,710k	+1.12	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Qc5-e3 45.Rd2-e2 Qe3-d3 46.Qa1-e1 f5-f4 47.Be5xf4 c4-c3 48.Rb2-b1 Nb5-d4 49.Re2-e3 Qd3-c2+ 50.Kg2-g1 Rc8-c5 51.Rb1-d1
 16/29	00:00	 3,190k	13,291k	+1.06	43.Rc2-d2 Qd4-c5 44.Bf4-e5 c4-c3 45.Rb2xb5 Ka6xb5 46.Rd2-d3 Qc5-c4 47.Rd3xc3 Qc4-e2+ 48.Kg2-g1 Rc8-c4 49.Be5xg7 a5-a4 50.Bg7xh6 Rc4-d4 51.Rc3-c1 Rd4-b4 52.Rc1-b1 Rb4-b3 53.Bh6-f4 e6-e5 54.Rb1xb3+ a4xb3 55.Qa1xe5 Qe2-d1+ 56.Kg1-g2 Qd1-c2+ 57.Kg2-h3
 17/30	00:00	 3,794k	13,173k	+1.05	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Qc5-c6 45.Qa1-f1 Qc6-d7 46.Rd2-d1 Rc8-c5 47.Rd1-b1 Ka6-b7 48.Qf1-f2 d5-d4 49.Rb2xb5 Rc5xb5 50.Rb1xb5 Qd7xb5 51.Qf2xd4
 18/26	00:00	 3,959k	13,196k	+1.05	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Qc5-c6 45.Qa1-f1 Qc6-d7 46.Rd2-d1 Rc8-c5 47.Rd1-b1 Ka6-b7 48.Qf1-f2 d5-d4 49.Rb2xb5 Rc5xb5 50.Rb1xb5 Qd7xb5 51.Qf2xd4 a5-a4 52.Be5xg7 a4-a3 53.Qd4-e3 Qb5-b3 54.Qe3xe6 Qb3-c2+ 55.Kg2-h3 Qc2-d3
 19/28	00:00	 9,363k	13,150k	+1.20	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Qc5-e3 45.Rd2-e2 Qe3-c5 46.Be5xg7 c4-c3 47.Rb2-a2 Rc8-c6 48.Bg7xh6 d5-d4 49.Bh6-f4 d4-d3 50.Re2-e1 Qc5-d5 51.Re1-e5 Qd5-c4 52.h5-h6 d3-d2
 20/39	00:01	 13,679k	13,077k	+1.15	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Qc5-c6 45.Qa1-f1 Rc8-d8 46.Rd2-c2 Qc6-c5 47.Be5xg7 Rd8-g8 48.Bg7-f6 Qc5-d6 49.f3-f4 Qd6-c6 50.Rc2-c1 Rg8-f8
 21/34	00:01	 15,102k	13,075k	+1.25	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Qc5-e3 45.Rd2-e2 Qe3-c5 46.Be5xg7 c4-c3 47.Rb2-a2 Qc5-e7 48.Bg7xh6 Rc8-h8 49.Bh6-e3 d5-d4 50.Be3xd4 Nb5xd4 51.Qa1xc3 Qe7-d6 52.Ra2-d2 e6-e5 53.Qc3-c4+ b6-b5 54.Qc4-f7 Rh8-h6 55.Re2-e3 Qd6-c6 56.Rd2-f2 e5-e4 57.f3xe4 Nd4-c2 58.Re3-e2 Nc2-d4
 22/37	00:02	 26,034k	12,762k	+1.15	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Qc5-e3 45.Rd2-e2 Qe3-c5 46.Qa1-d1 c4-c3 47.Re2-c2 Qc5-c4 48.Be5xg7 Rc8-c7 49.Bg7-e5 Rc7-c6 50.Rb2xb5 Qc4xb5 51.Qd1-e1 a5-a4 52.Rc2xc3 Rc6xc3 53.Be5xc3 a4-a3 54.Qe1-f1 Qb5xf1+ 55.Kg2xf1 Ka6-b5 56.g3-g4 Kb5-c4 57.Bc3-a1 f5xg4 58.f3xg4 d5-d4
 23/36	00:02	 26,989k	12,755k	+1.15	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Qc5-e3 45.Rd2-e2 Qe3-c5 46.Qa1-d1 c4-c3 47.Re2-c2 Qc5-c4 48.Be5xg7 Rc8-c7 49.Bg7-e5 Rc7-c6 50.Rb2xb5 Qc4xb5 51.Qd1-e1 a5-a4 52.Rc2xc3 Rc6xc3 53.Be5xc3 a4-a3 54.Qe1-f1 Qb5xf1+ 55.Kg2xf1 Ka6-b5 56.g3-g4 Kb5-c4 57.Bc3-a1 f5xg4 58.f3xg4 d5-d4 59.g4-g5
 24/51+	00:03	 44,677k	12,905k	+1.32	43.Rc2-d2
 24/51	00:03	 45,094k	12,899k	+1.29	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Qc5-e3 45.Rd2-e2 Qe3-c5 46.Qa1-d1 c4-c3 47.Re2-c2 Qc5-c4 48.Be5xg7 Rc8-g8 49.Bg7-e5 Rg8-d8 50.Rb2xb5 Qc4xb5 51.Be5-f6 Rd8-d6 52.Qd1-d4 Qb5-c4 53.Rc2xc3 Qc4-e2+ 54.Qd4-f2 Qe2xf2+ 55.Kg2xf2 b6-b5 56.g3-g4 b5-b4 57.Rc3-c8
 25/31-	00:03	 47,481k	12,875k	+1.23	43.Rc2-d2 Qd4-c5
 25/31+	00:04	 52,672k	12,869k	+1.29	43.Rc2-d2
 25/48+	00:04	 59,309k	12,874k	+1.38	43.Rc2-d2
 25/48	00:04	 61,992k	12,864k	+1.33	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Qc5-e3 45.Rd2-e2 Qe3-d3 46.Rb2-d2 Qd3-b3 47.Qa1-f1 c4-c3 48.Rd2-d1 Ka6-b7 49.Re2-e1 c3-c2 50.Rd1-d3 Qb3-c4 51.Re1-c1 d5-d4 52.Be5xg7 Rc8-c7 53.Bg7-f6 a5-a4 54.Rd3-d2 Qc4-b3 55.Bf6xd4 Nb5xd4 56.Rd2xd4 a4-a3 57.Rd4-d2 a3-a2 58.Qf1-e1
 26/43+	00:06	 76,767k	12,786k	+1.40	43.Rc2-d2
 26/43	00:07	 93,289k	12,795k	+1.43	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Qc5-e3 45.Qa1-a4 Qe3-c5 46.Qa4-d1 Qc5-c6 47.Qd1-f1 Rc8-d8 48.Rd2-c2 Rd8-d7 49.Rc2-c1 Rd7-b7 50.Rc1-b1 Nb5-a3 51.Rb1-a1 Na3-b5 52.Qf1-f2 d5-d4 53.Be5xd4 Nb5xd4 54.Qf2xd4 Rb7-d7 55.Qd4-e3 Rd7-d3 56.Qe3-e2 b6-b5 57.Rb2-d2 Rd3xd2 58.Qe2xd2 a5-a4 59.Qd2-c3 Qc6-d6 60.Ra1-e1 a4-a3
 27/44+	00:09	 118,496k	12,856k	+1.48	43.Rc2-d2
 27/50	00:10	 136,351k	12,890k	+1.45	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Qc5-e3 45.Rd2-e2 Qe3-c5 46.Qa1-d1 Rc8-d8 47.Be5xg7 Rd8-d7 48.Rb2xb5 Qc5xb5 49.Bg7-d4 Rd7-d6 50.Qd1-d2 c4-c3 51.Qd2-e3 Rd6-c6 52.Re2-c2 Rc6-c4 53.Qe3-d3 a5-a4 54.Rc2xc3 Qb5-b2+ 55.Kg2-f1 Qb2-a1+ 56.Kf1-f2 Qa1-a2+ 57.Kf2-e1 b6-b5 58.Rc3xc4 d5xc4 59.Qd3-e3 a4-a3 60.Qe3xe6+ Ka6-a5
 28/35+	00:12	 162,231k	12,941k	+1.52	43.Rc2-d2
 28/45	00:13	 173,164k	12,936k	+1.53	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Qc5-e3 45.Rd2-e2 Qe3-c5 46.Qa1-d1 Rc8-d8 47.Be5xg7 Rd8-d7 48.Rb2xb5 Qc5xb5 49.Bg7-d4 Rd7-d6 50.Qd1-c1 c4-c3 51.Qc1-e3 Rd6-c6 52.Re2-c2 Rc6-c4 53.Qe3-d3 Ka6-b7 54.Rc2xc3 Qb5-b2+ 55.Kg2-g1 Qb2-a1+ 56.Kg1-f2 Qa1-a2+ 57.Kf2-e3 a5-a4 58.Bd4-e5 b6-b5 59.Rc3xc4 b5xc4 60.Qd3-c3 Kb7-c6 61.Qc3-a5 Qa2-a3+ 62.Ke3-f2 Qa3-a2+ 63.Kf2-g1 Qa2-c2
 29/41+	00:16	 216,806k	13,001k	+1.60	43.Rc2-d2
 29/58	00:17	 222,594k	12,995k	+1.55	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Qc5-e3 45.Rd2-e2 Qe3-c5 46.Qa1-d1 c4-c3 47.Re2-c2 a5-a4 48.Be5xg7 a4-a3 49.Rb2-b3 d5-d4 50.Bg7xd4 Nb5xd4 51.Rc2xc3 Nd4xb3 52.Rc3xc5 Nb3xc5 53.Qd1-a1 b6-b5 54.Qa1xa3+ Ka6-b6 55.Qa3-c1 b5-b4 56.Qc1xh6 b4-b3 57.Qh6-c1 Kb6-c6 58.h5-h6 Rc8-b8 59.Qc1-b2 Nc5-d3 60.Qb2-b1 b3-b2 61.h6-h7 Nd3-c5 62.g3-g4 Nc5-d7 63.g4-g5 Nd7-e5 64.Qb1-c2+ Kc6-d6 65.Qc2-d2+ Kd6-c6 66.h7-h8Q Rb8xh8 67.Qd2xb2 Ne5-g6 68.Qb2-g7 Ng6-f4+ 69.Kg2-g1 Rh8-h3
 30/46+	00:22	 293,287k	12,932k	+1.64	43.Rc2-d2
 30/51+	00:27	 353,463k	12,890k	+1.72	43.Rc2-d2
 30/53	00:27	 360,189k	12,885k	+1.53	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Qc5-e3 45.Rd2-e2 Qe3-c5 46.Qa1-d1 c4-c3 47.Re2-c2 a5-a4 48.Be5xg7 a4-a3 49.Rb2xb5 Qc5xb5 50.Qd1-a1 Qb5-b4 51.Rc2-a2 e6-e5 52.Ra2xa3+ Ka6-b5 53.Bg7xh6 f5-f4 54.Qa1-a2 c3-c2 55.Qa2xd5+ Rc8-c5 56.Qd5-d7+ Rc5-c6 57.Bh6-f8 c2-c1Q 58.Bf8xb4 Kb5xb4 59.Ra3-a2 Rc6-c2+ 60.Ra2xc2 Qc1xc2+ 61.Kg2-h3 Qc2-f2 62.Qd7-g4 Kb4-a5 63.h5-h6 Qf2-f1+ 64.Kh3-h4
 31/69+	00:30	 387,233k	12,895k	+1.66	43.Rc2-d2
 31/69+	00:34	 440,012k	12,932k	+1.74	43.Rc2-d2
 31/69	00:34	 441,976k	12,935k	+1.56	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Qc5-e3 45.Qa1-a4 Qe3-c5 46.Qa4-d1 c4-c3 47.Rd2-c2 a5-a4 48.Be5xg7 a4-a3 49.Rb2-b3 d5-d4 50.Bg7xd4 Nb5xd4 51.Qd1-d3+ b6-b5 52.Rc2xc3 Nd4xb3 53.Rc3xc5 Nb3xc5 54.Qd3xa3+ Ka6-b6 55.Qa3-e3 b5-b4 56.Qe3xh6 b4-b3 57.Qh6-c1 Kb6-c6 58.h5-h6 Rc8-b8 59.Qc1-b2 Nc5-d3 60.Qb2-b1 b3-b2 61.h6-h7 Nd3-c5 62.g3-g4 e6-e5 63.Qb1xf5 e5-e4 64.Qf5-f6+ Kc6-d7 65.Qf6-f7+ Kd7-c6 66.Qf7-a2 e4xf3+ 67.Kg2xf3 Kc6-d6 68.g4-g5 Nc5-e6 69.g5-g6
 32/59+	00:36	 467,519k	12,934k	+1.69	43.Rc2-d2
 32/59	00:38	 493,962k	12,922k	+1.76	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Qc5-e3 45.Qa1-a4 Qe3-c5 46.Qa4-d1 c4-c3 47.Rd2-c2 a5-a4 48.Be5xg7 a4-a3 49.Rb2-b3 d5-d4 50.Bg7xd4 Nb5xd4 51.Qd1-d3+ b6-b5 52.Rc2xc3 Nd4xb3 53.Rc3xc5 Nb3xc5 54.Qd3xa3+ Ka6-b6 55.Qa3-e3 Kb6-c6 56.Qe3xh6 b5-b4 57.Qh6-c1 b4-b3 58.h5-h6 Rc8-b8 59.Qc1-b2 Nc5-d3 60.Qb2-b1 Nd3-c5 61.g3-g4 f5xg4 62.f3xg4 b3-b2 63.h6-h7 e6-e5 64.g4-g5 Kc6-d6 65.g5-g6
 33/63-	00:39	 507,125k	12,925k	+1.64	43.Rc2-d2 Qd4-c5
 33/67+	00:45	 594,396k	12,947k	+1.73	43.Rc2-d2
 33/67	00:49	 641,894k	12,978k	+1.78	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Qc5-c6 45.Qa1-f1 Rc8-d8 46.Be5xg7 d5-d4 47.Rb2xb5 Qc6xb5 48.Rd2xd4 Rd8xd4 49.Bg7xd4 e6-e5 50.Bd4-e3 Qb5-b2+ 51.Kg2-h3 Qb2-c3 52.Be3xh6 a5-a4 53.Bh6-c1 Ka6-b7 54.Qf1-d1 Qc3-d3 55.Qd1xd3 c4xd3 56.h5-h6 a4-a3 57.h6-h7 a3-a2 58.h7-h8Q a2-a1Q 59.Qh8-h7+ Kb7-a6
 34/47+	01:07	 875,729k	12,956k	+1.85	43.Rc2-d2
 34/67+	01:21	 1,058,316k	12,918k	+1.94	43.Rc2-d2
 34/67	01:26	 1,121,042k	12,910k	+1.96	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Qc5-c6 45.Qa1-f1 Rc8-d8 46.Be5xg7 Rd8-d7 47.Bg7-e5 d5-d4 48.Rb2xb5 Qc6xb5 49.Rd2xd4 Rd7xd4 50.Be5xd4 e6-e5 51.Bd4-e3 a5-a4 52.Be3xh6 Qb5-b2+ 53.Kg2-h3 Qb2-c2 54.Bh6-c1 f5-f4 55.g3xf4 e5xf4 56.Kh3-h4 b6-b5 57.Qf1-g1 Qc2-c3 58.Bc1xf4 Qc3xf3 59.Qg1-d4 Qf3-h1+ 60.Kh4-g5 Qh1-g2+ 61.Kg5-f6 Qg2-c6+ 62.Kf6-f7 a4-a3 63.h5-h6 Qc6-b7+ 64.Kf7-g6 Qb7-c6+ 65.Kg6-g5 Qc6-g2+ 66.Kg5-f6 Qg2-c6+ 67.Qd4-d6 Qc6xd6+ 68.Bf4xd6 b5-b4
 35/65	01:41	 1,303,811k	12,901k	+1.89	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Qc5-e3 45.Rd2-e2 Qe3-c5 46.Qa1-d1 Rc8-d8 47.Be5xg7 Rd8-d7 48.Rb2xb5 Qc5xb5 49.Bg7-d4 Rd7-d6 50.Qd1-d2 c4-c3 51.Qd2-e3 Rd6-c6 52.Re2-c2 Rc6-c4 53.Qe3-d3 Qb5-b1 54.Rc2xc3 Qb1xd3 55.Rc3xd3 b6-b5 56.Bd4-e3 Rc4-c7 57.Be3-f4 Rc7-f7 58.Rd3-e3 b5-b4 59.Re3xe6+ Ka6-b5 60.Re6xh6 a5-a4 61.Rh6-h8 a4-a3 62.Rh8-b8+ Kb5-c5 63.Bf4-c1 a3-a2 64.Bc1-b2 Kc5-c4 65.Bb2-a1 Rf7-e7 66.Kg2-f2 Kc4-d3 67.Rb8xb4 Re7-e2+ 68.Kf2-f1 Re2-h2 69.Kf1-g1 Rh2-c2
 36/37+	02:03	 1,587,068k	12,853k	+2.01	43.Rc2-d2
 36/45	02:04	 1,604,021k	12,853k	+1.93	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Qc5-e3 45.Rd2-e2 Qe3-c5 46.Qa1-d1 Rc8-d8 47.Be5xg7 Rd8-d7 48.Rb2xb5 Qc5xb5 49.Bg7-d4 Rd7-d6 50.Qd1-d2 c4-c3 51.Qd2-e3 Rd6-c6 52.Re2-c2 Rc6-c4 53.Qe3-d3 a5-a4 54.Rc2xc3 Qb5-b2+ 55.Kg2-f1 Qb2-a1+ 56.Kf1-e2 Qa1-a2+ 57.Ke2-e1 Ka6-b7 58.Rc3xc4 d5xc4 59.Qd3-e2 Qa2-b1+ 60.Ke1-f2 a4-a3 61.Qe2xc4 a3-a2 62.Qc4-a4 b6-b5 63.Qa4-a3 Qb1-c2+ 64.Kf2-e3 Qc2-c4 65.Qa3-c3 Qc4-a4
 37/61+	02:20	 1,800,620k	12,817k	+2.05	43.Rc2-d2
 37/66+	02:54	 2,235,548k	12,806k	+2.15	43.Rc2-d2
 37/66	03:05	 2,377,545k	12,790k	+2.10	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Qc5-e3 45.Qa1-a4 Qe3-c5 46.Qa4-d1 Rc8-d8 47.Be5xg7 Qc5-c7 48.Bg7-f6 Rd8-f8 49.Qd1-a4 Rf8xf6 50.Qa4xb5+ Ka6-a7 51.Rd2-e2 d5-d4 52.Re2-e1 c4-c3 53.Rb2-e2 Qc7-d6 54.Qb5-e8 Qd6-c7 55.Qe8-a4 Qc7-d6 56.Re2-e5 Ka7-b7 57.Qa4-c4 Qd6-b4 58.Qc4-d3 Qb4-b2+ 59.Re5-e2 Qb2-b4
 38/72+	03:45	 2,881,004k	12,767k	+2.22	43.Rc2-d2
 38/72	04:43	 3,577,778k	12,612k	+2.32	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Qc5-e3 45.Qa1-a4 Qe3-c5 46.Qa4-d1 c4-c3 47.Rd2-c2 a5-a4 48.Be5xg7 a4-a3 49.Rb2-b3 d5-d4 50.Bg7xd4 Nb5xd4 51.Rc2xc3 Nd4xb3 52.Rc3xc5 Nb3xc5 53.Qd1-a1 Ka6-b7 54.Qa1xa3 b6-b5 55.Qa3-b4 Kb7-c6 56.Qb4-f4 Rc8-g8 57.Qf4xh6 b5-b4 58.Qh6-c1 b4-b3 59.h5-h6 Rg8-b8 60.Qc1-b2 Nc5-d3 61.Qb2-b1 b3-b2 62.h6-h7 Nd3-c5 63.g3-g4 f5xg4 64.f3xg4 Kc6-d6 65.g4-g5 e6-e5 66.g5-g6 Nc5-e6 67.Kg2-g3 Kd6-e7 68.Qb1xb2 Rb8xb2 69.h7-h8Q Rb2-b1 70.Qh8-h7+ Ke7-d6 71.Qh7-a7 Rb1-c1 72.Kg3-g4 Rc1-c4+ 73.Kg4-h5 Rc4-c7 74.Qa7-b6+ Rc7-c6 75.Qb6-b4+ Kd6-d5
 39/80-	04:47	 3,621,956k	12,605k	+2.14	43.Rc2-d2 Qd4-c5
 39/80-	04:48	 3,636,236k	12,603k	+2.00	43.Rc2-d2 Qd4-c5
 39/80	04:57	 3,748,258k	12,583k	+1.88	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Qc5-e3 45.Qa1-a4 Qe3-c5 46.Qa4-d1 c4-c3 47.Rd2-c2 a5-a4 48.Be5xg7 a4-a3 49.Rb2-b3 d5-d4 50.Bg7xd4 Nb5xd4 51.Rc2xc3 Nd4xb3 52.Rc3xc5 Nb3xc5 53.Qd1-c1 b6-b5 54.Qc1xa3+ Ka6-b7 55.Qa3-b4 Kb7-c6 56.Qb4-f4 Rc8-c7 57.g3-g4 Rc7-h7 58.Kg2-h2 Rh7-h8 59.Kh2-h3 Rh8-h7 60.Kh3-h4 f5xg4 61.f3xg4 Rh7-b7 62.Qf4xh6 b5-b4 63.Qh6-g6 b4-b3 64.h5-h6 b3-b2 65.Qg6-b1 Nc5-a4 66.h6-h7 Na4-c3 67.h7-h8Q Nc3xb1 68.Qh8-c8+ Kc6-b6 69.Qc8-c2 Kb6-a5 70.Qc2xb1 Rb7-b4 71.Kh4-h5 Rb4-b3 72.g4-g5 Ka5-a4 73.g5-g6 Ka4-a3 74.Kh5-g4 Rb3-b4+ 75.Kg4-f3 Rb4-b3+ 76.Kf3-f2
 40/7-	05:01	 3,789,042k	12,576k	+1.83	43.Rc2-d2 Qd4-c5
 40/81+	05:13	 3,930,963k	12,554k	+1.94	43.Rc2-d2
 40/81+	05:36	 4,212,536k	12,532k	+2.26	43.Rc2-d2
 40/81	05:39	 4,256,024k	12,529k	+1.94	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Qc5-c6 45.Qa1-f1 Rc8-d8 46.Be5xg7 d5-d4 47.Rb2xb5 Qc6xb5 48.Rd2xd4 Rd8xd4 49.Bg7xd4 e6-e5 50.Bd4-e3 Qb5-c6 51.Qf1-c1 c4-c3 52.Be3xh6 f5-f4 53.Bh6-g5 c3-c2 54.h5-h6 Qc6-g6 55.g3xf4 e5-e4 56.f4-f5 Qg6xf5 57.Qc1-f4 e4xf3+ 58.Kg2xf3 Qf5-d5+ 59.Kf3-g3 Qd5-e6 60.Qf4-e3 Qe6-g6 61.Kg3-f2 a5-a4 62.Bg5-f4
 41/43+	05:52	 4,409,966k	12,526k	+2.13	43.Rc2-d2
 41/43+	06:06	 4,588,634k	12,508k	+2.24	43.Rc2-d2
 41/78	06:49	 5,081,112k	12,416k	+2.30	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Qc5-e3 45.Qa1-a4 Qe3-c5 46.Qa4-d1 c4-c3 47.Rd2-c2 a5-a4 48.Be5xg7 a4-a3 49.Rb2-b3 d5-d4 50.Bg7xd4 Nb5xd4 51.Qd1-d3+ Ka6-b7 52.Rc2xc3 Nd4xb3 53.Rc3xc5 Nb3xc5 54.Qd3xa3 b6-b5 55.Qa3-b4 Kb7-c6 56.Qb4-f4 Rc8-h8 57.g3-g4 Rh8-h7 58.Kg2-h2 Nc5-b7 59.Qf4-b8 Nb7-d6 60.Qb8-a8+ Kc6-c5 61.Qa8-g8 Rh7-c7 62.g4-g5 h6xg5 63.h5-h6 Nd6-f7 64.h6-h7 Kc5-d5 65.Qg8-f8 Kd5-c6 66.Qf8-e8+ Kc6-d6 67.Qe8-b8 Kd6-c6 68.Kh2-g3 Rc7-d7 69.Qb8-e8 Kc6-d6 70.h7-h8Q Nf7xh8 71.Qe8xh8
 42/68	07:04	 5,270,445k	12,407k	+2.28	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Qc5-e3 45.Qa1-a4 Qe3-c5 46.Qa4-d1 c4-c3 47.Rd2-c2 a5-a4 48.Be5xg7 a4-a3 49.Rb2-b3 d5-d4 50.Bg7xd4 Nb5xd4 51.Rc2xc3 Nd4xb3 52.Rc3xc5 Nb3xc5 53.Qd1-a1 b6-b5 54.Qa1xa3+ Ka6-b7 55.Qa3-b4 Kb7-c6 56.Qb4-f4 Rc8-h8 57.g3-g4 Rh8-h7 58.Kg2-h2 Rh7-h8 59.Kh2-g3 Rh8-h7 60.Kg3-h4 f5xg4 61.f3xg4 Rh7-b7 62.Qf4xh6 b5-b4 63.Qh6-d2 b4-b3 64.Qd2-g2+ Kc6-c7 65.h5-h6 b3-b2 66.h6-h7 b2-b1Q 67.h7-h8Q Qb1-d3 68.Qg2-g3+ Qd3xg3+ 69.Kh4xg3 Nc5-e4+ 70.Kg3-f4 Ne4-d6 71.g4-g5 Rb7-b4+ 72.Kf4-f3 Rb4-b3+ 73.Kf3-g4 Nd6-f5 74.Qh8-a8 Rb3-g3+ 75.Kg4-f4
 43/58+	08:21	 6,215,511k	12,385k	+2.41	43.Rc2-d2
 43/75	09:28	 7,001,939k	12,320k	+2.22	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Qc5-e3 45.Qa1-a4 Qe3-c5 46.Qa4-d1 Qc5-c6 47.Qd1-f1 Qc6-c5 48.Rb2-b1 d5-d4 49.Be5xg7 Rc8-c7 50.Bg7xh6 Nb5-a3 51.Rb1-e1 e6-e5 52.Rd2-e2 e5-e4 53.f3xe4 f5xe4 54.Bh6-f8 Qc5xh5 55.Bf8xa3 d4-d3 56.Re2xe4 Qh5-d5 57.Qf1-f3 d3-d2 58.Re1-d1 c4-c3 59.Kg2-f2 c3-c2 60.Qf3-e2+ Rc7-c4 61.Re4xc4 c2xd1Q 62.Qe2xd1 Qd5xc4 63.Qd1xd2 Qc4-f7+ 64.Kf2-e1 Qf7-b3 65.Ba3-d6 a5-a4 66.Qd2-d1 Qb3-c3+ 67.Ke1-e2 a4-a3 68.Qd1-a4+ Ka6-b7
 44/67+	11:32	 8,433,908k	12,176k	+2.40	43.Rc2-d2
 44/67+	12:22	 9,001,175k	12,122k	+2.54	43.Rc2-d2
 44/67	12:58	 9,412,165k	12,089k	+2.59	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Qc5-e3 45.Qa1-a4 Qe3-c5 46.Qa4-d1 Qc5-c6 47.Qd1-f1 Qc6-d7 48.Rb2-b1 Rc8-c6 49.Rd2-b2 Nb5-a3 50.Rb1-a1 Na3-b5 51.Ra1-d1 d5-d4 52.Rb2xb5 Ka6xb5 53.Rd1xd4 Qd7-e7 54.Qf1-d1 Qe7-g5 55.Rd4-d7 Qg5-e3 56.Be5xg7 Kb5-a6 57.Bg7-d4 Qe3-b3 58.Qd1-e2 a5-a4 59.Rd7-d8 Ka6-b7 60.Bd4-e5 Qb3-b5 61.Be5-c3 Qb5-b3 62.Qe2-d2 Kb7-a6 63.Qd2-d7 Qb3-c2+ 64.Bc3-d2 Ka6-b5 65.Rd8-c8 Qc2xd2+ 66.Qd7xd2 Rc6xc8 67.Qd2xh6 c4-c3 68.Qh6xe6 Rc8-c5 69.Qe6-e3 a4-a3 70.h5-h6 c3-c2
 45/68	14:46	 10,633,625k	11,993k	+2.57	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Qc5-e3 45.Qa1-a4 Qe3-c5 46.Qa4-d1 c4-c3 47.Rd2-c2 a5-a4 48.Be5xg7 a4-a3 49.Rb2-b3 d5-d4 50.Bg7xd4 Nb5xd4 51.Rc2xc3 Nd4xb3 52.Rc3xc5 Nb3xc5 53.Qd1-a1 b6-b5 54.Qa1xa3+ Ka6-b7 55.Qa3-b4 Kb7-c6 56.Qb4-f4 Rc8-c7 57.g3-g4 Rc7-h7 58.Kg2-h2 Rh7-h8 59.Kh2-h3 Rh8-h7 60.Kh3-h4 f5xg4 61.f3xg4 Rh7-b7 62.Qf4xh6 b5-b4 63.Qh6-d2 b4-b3 64.Qd2-g2+ Kc6-c7 65.h5-h6 b3-b2 66.h6-h7 b2-b1Q 67.h7-h8Q Qb1-d1 68.Qh8-c3 Rb7-b5 69.g4-g5
 46/68+	20:57	 14,774,853k	11,746k	+2.73	43.Rc2-d2
 46/88	23:59	 16,792,249k	11,662k	+2.77	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Qc5-e3 45.Qa1-a4 Qe3-c5 46.Qa4-d1 f5-f4 47.g3xf4 Qc5-e7 48.Rb2-b1 Nb5-a3 49.Rb1-a1 c4-c3 50.Qd1-e2+ Na3-c4 51.Be5xc3 Qe7-f7 52.Rd2-a2 Rc8-c5 53.Bc3-b4 Rc5-b5 54.Bb4-d2 Rb5-c5 55.Ra1-h1 g7-g6 56.h5xg6 Qf7xg6+ 57.Kg2-f2 Rc5-c8 58.Rh1-g1 Qg6-f6 59.Rg1-g4 h6-h5 60.Rg4-g5 b6-b5 61.Kf2-g2 Nc4xd2 62.Qe2xd2 a5-a4 63.Rg5xh5 Rc8-c6 64.Rh5-g5 Qf6-c3 65.Qd2xc3 Rc6xc3 66.Rg5-g8 Rc3-c4 67.Rg8-b8 d5-d4 68.Ra2-b2 d4-d3
 47/88	25:53	 18,042,197k	11,611k	+2.77	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Qc5-e3 45.Qa1-a4 Qe3-c5 46.Qa4-d1 f5-f4 47.g3xf4 Qc5-e7 48.Rb2-b1 Nb5-a3 49.Rb1-a1 c4-c3 50.Qd1-e2+ Na3-c4 51.Be5xc3 Qe7-f7 52.Rd2-a2 Rc8-c5 53.Bc3-b4 Rc5-b5 54.Bb4-d2 Rb5-c5 55.Ra1-h1 g7-g6 56.h5xg6 Qf7xg6+ 57.Kg2-f2 Rc5-c8 58.Rh1-g1 Qg6-f6 59.Rg1-g4 h6-h5 60.Rg4-g5 b6-b5 61.Kf2-g2 Nc4xd2 62.Qe2xd2 a5-a4 63.Rg5xh5 Rc8-c6 64.Rh5-g5 Qf6-c3 65.Qd2xc3 Rc6xc3 66.Rg5-g8 Rc3-c4 67.Rg8-b8 d5-d4 68.Ra2-b2 d4-d3
 45/69	25:53	 18,042,197k	11,611k	+2.80	43.Rc2-d2 Qd4-c5 44.Bf4-e5 Qc5-e3 45.Qa1-a4 Qe3-c5 46.Qa4-d1 c4-c3 47.Rd2-c2 a5-a4 48.Be5xg7 a4-a3 49.Rb2-b3 d5-d4 50.Bg7xd4 Nb5xd4 51.Rc2xc3 Nd4xb3 52.Rc3xc5 Nb3xc5 53.Qd1-c1 b6-b5 54.Qc1xa3+ Ka6-b6 55.Qa3-e3 b5-b4 56.Qe3xh6 b4-b3 57.Qh6-c1 Rc8-b8 58.h5-h6 Kb6-c6 59.Qc1-b2 Nc5-d3 60.Qb2-b1 b3-b2 61.h6-h7 Nd3-c5 62.g3-g4 Kc6-c7

and here is the pgn of the analysis:
[pgn][Event "position"] [Site "Columbus, Ohio"] [Date "2024.01.26"] [Round "?"] [White "ShashChess33.1-x86-64-bmi2"] [Black "ShashChess33.1-x86-64-bmi2"] [Result "*"] [Time "13:54:03"] [TimeControl "0"] [SetUp "1"] [FEN "2r5/6p1/kp2p2p/pn1p1p1P/2pq1B2/5PP1/1RR3K1/Q7 w - - 1 43"] [Termination "unterminated"] [PlyCount "40"] [WhiteType "program"] [BlackType "program"] 43. Rd2 {+2.80/45 1553 ShashChess33.1-x86-64-bmi2} Qc5 44. Be5 Qe3 45. Qa4 Qc5 46. Qd1 c3 47. Rdc2 a4 48. Bxg7 a3 49. Rb3 d4 50. Bxd4 Nxd4 51. Rcxc3 Nxb3 52. Rxc5 Nxc5 53. Qc1 b5 54. Qxa3+ Kb6 55. Qe3 b4 56. Qxh6 b3 57. Qc1 Rb8 58. h6 Kc6 59. Qb2 Nd3 60. Qb1 b2 61. h7 Nc5 62. g4 Kc7 * [/pgn]

[Eelco de Groot]

(All this with one thread. I am doing some troubleshooting for an unrelated post from Peter Berger in the Pro Deo forum who is using Rebel EAS in Chessbase with four threads. I think Rebel can actually only do two threads when you set it to four but not 100% sure. Chris does not recommend more than one thread for his program he posted in the past.)

You could have told me.

Hi Peter, sorry if you saw this only later, I do not really know what the status is on this. Two threads is okay on my computer it seems, but the program makes own decisions on what it does anyway. So it differs per computer. And Ed's version of the program is a bit different. Neither have been tested with Shredder I think, I am not even sure what Arena does in 'analysis mode' setting of the GUI, it may just use go infinite like I think older GUIs did, but UCI_AnalyseMode is not being used much anymore, Stockfish does not have the setting anymore but did not do anything with it for years to my knowledge. All that has an influence, or could have an influence at least.

If you insist on overriding the limitations set by the program itself, there was a thread from Dann Corbit on ProDeo about that.