Other fun mates

[xr_a_y]

Stockfish-dev [...] mate-in-5 score at 18992 nodes.

Impressive !

[xr_a_y]

Mate in #8

[d] 4k3/8/8/1p1p1p1p/pPpPpPpP/P1P1P1P1/8/RNBQKBNR w KQ - 0 1

If it's too hard, try this

[d] 4k3/8/8/1p1p1p1p/pPpPpPpP/P1P1P1P1/8/3QKB2 w - - 0 1

Minic is finding f1c4 more or less immediately but has trouble with the continuation ...

You can also try this one for more zugzwang

[d] 4k3/8/8/1p1p1p1p/pPpPpPpP/P1P1P1P1/8/3RKB2 w - - 0 1

[Terje]

Weiss solves all 3 fairly quickly, going for Bxc4 almost instantly and announcing the correct mate after 25 seconds for the first one, faster for the others.

Ethereal starts with Nh3 and finds a mate in 10 there, before the mate in 8 from Bxc4 at 20s.

SF11 finds it in 5 seconds.

[JVMerlino]

Which depth to see this 3 sac mate in  #5

[d] r2q1r2/3b1p2/2nbp1k1/5NP1/1ppP1P2/1p4Q1/PBPP4/2KR3R w - - 4 24

Minic needs only depth 16 (seldepth 38)

This position has two solutions. Both Rh6 and Qg4 lead to mate in 5.

24.Rh6+ Kxf5 25.Qh3+ Ke4 26.Re1+ Kxf4 27.Rf1+ Kxg5 28.Qh5#
24.Qg4 Rh8 25.Rh6+ Rxh6 26.gxh6+ Qg5 27.Qxg5+ Kh7 28.Qg7#

[JVMerlino]

Mate in #8
[d] 4k3/8/8/1p1p1p1p/pPpPpPpP/P1P1P1P1/8/RNBQKBNR w KQ - 0 1

Myrddin on 8 cores (yay new machine!) says mate in 9 in 3 seconds - but doesn't see Mate in 8 in a reasonable time.

[xr_a_y]

mate in #10

[d] 2k3q1/7P/2K5/8/5q1q/8/8/5q2 w - - 0 1

See http://tb7.chessok.com/articles/article_02_pawn for other fun stuff with only one pawn !

[JVMerlino]

From my list of test positions:

The fastest your engine will ever find mate in 7:
[d]7k/3b3p/1p6/3p1P1P/2p3r1/2P1R3/7r/2RK4 b - -

Mate in 9:
[d]5r2/pb3p1k/1pn3p1/2p1PP2/8/b2RQ3/qP4PP/5R1K w - -

An easy mate in 10:
[d]3R4/2r5/6rp/2k5/p1p2p1P/P1Rp1P2/1P6/5K2 b - -

A not quite as easy mate in 10:
[d]6rk/5r1p/Q2p4/P2Pbpq1/NP3p1n/R1P1pP2/6PP/3B2RK b - -

Finding Rh8 is easy, but announcing mate in 16?:
[d]3rrk2/1bnqppb1/p2p2p1/1p1P2P1/1p2PP1R/2NQBN2/1PP2K2/7R w - -

Mate in...? I ran SF on it (no tbs) and at depth 70 it still hadn't announced mate. I'm curious if somebody with tbs and good hardware can check it.
[d]8/8/8/4b1k1/8/5P2/Pp5p/1K5R w - -

jm

[MOBMAT]

Mate in #20 (or less?)

[d] 2r5/p3R3/kp1Q4/3p2P1/3q4/1P1P4/P1P3b1/1K6 w - - 4 31

Booot 6.3.1

Code: Select all

FEN: 2r5/p3R3/kp1Q4/3p2P1/3q4/1P1P4/P1P3b1/1K6 w - - 4 31

Booot 6.3.1:
 19	00:00	 1,392k	5,567k	+10.04	31.Qa3+ Kb5 32.c4+ Rxc4 33.dxc4+ Kc6 34.Qa4+ Kd6 35.c5+ Kxc5 36.Rc7+ Kd6 37.Qxd4 Kxc7 38.g6 Be4+ 39.Qxe4 dxe4 40.g7 e3 41.g8Q Kd6 42.Qb8+ Kd5 43.Qxa7 Ke4 44.Qxb6 e2 45.Qf2 Kd3
 20+	00:00	 1,665k	5,904k	+10.14	31.Qa3+
 20	00:00	 1,742k	5,864k	+10.20	31.Qa3+ Kb5 32.c4+ Rxc4 33.dxc4+ Kc6 34.Qa4+ Kd6 35.c5+ Kxc5 36.Rc7+ Kd6 37.Qxd4 Kxc7 38.g6 Be4+ 39.Qxe4 dxe4 40.g7 e3 41.g8Q Kd6 42.Qg3+ Kc6 43.Qxe3 a5 44.Qd3 Kb7 45.Qe4+ Kc7 46.b4
 21+	00:00	 1,951k	5,672k	+10.30	31.Qa3+
 21+	00:00	 2,118k	5,883k	+10.40	31.Qa3+
 21+	00:00	 2,417k	5,727k	+10.57	31.Qa3+
 21	00:00	 2,555k	5,833k	+10.67	31.Qa3+ Kb5 32.c4+ Rxc4 33.dxc4+ Kc6 34.Qa4+ Kd6 35.c5+ Kxc5 36.Rc7+ Kd6 37.Qxd4 Kxc7 38.g6 Be4+ 39.Qxe4 dxe4 40.g7 Kd6 41.g8Q Ke5 42.Qb8+ Kd4 43.Qxa7 e3 44.Qxb6+ Kd3 45.Qd6+ Ke2 46.b4 Kf3 47.Qf6+ Ke2 48.Qe5
 22+	00:00	 3,236k	5,747k	+10.77	31.Qa3+
 22+	00:00	 3,695k	5,912k	+10.87	31.Qa3+
 22	00:00	 4,101k	5,961k	+11.00	31.Qa3+ Kb5 32.c4+ Rxc4 33.dxc4+ Kc6 34.Qa4+ Kd6 35.c5+ Kxc5 36.Rc7+ Kd6 37.Qxd4 Kxc7 38.g6 Be4+ 39.Qxe4 dxe4 40.g7 Kd6 41.g8Q Ke5 42.Qb8+ Kd4 43.Qxa7 e3 44.Qxb6+ Kd3 45.Qd6+ Ke2 46.b4 Kf3 47.Qf6+ Kg2 48.Qe6 Kf2 49.b5
 23	00:00	 4,512k	5,891k	+10.97	31.Qa3+ Kb5 32.c4+ Rxc4 33.dxc4+ Kc6 34.Qa4+ Kd6 35.c5+ Kxc5 36.Rc7+ Kd6 37.Qxd4 Kxc7 38.g6 Be4+ 39.Qxe4 dxe4 40.g7 Kd6 41.g8Q Ke5 42.Qb8+ Kd4 43.Qxa7 Kd3 44.Qxb6 e3 45.Qd6+ Ke2 46.b4 Kf3 47.Qf6+ Ke4 48.Qe6+ Kf3 49.Qf5+ Ke2 50.Qe5
 24+	00:00	 5,671k	6,046k	+11.07	31.Qa3+
 24+	00:00	 6,030k	6,122k	+11.17	31.Qa3+
 24+	00:01	 6,722k	6,056k	+11.34	31.Qa3+
 24	00:01	 7,657k	6,125k	+11.52	31.Qa3+ Kb5 32.c4+ Rxc4 33.dxc4+ Kc6 34.Qa4+ Kd6 35.c5+ Kxc5 36.Rc7+ Kd6 37.Qxd4 Kxc7 38.g6 Be4+ 39.Qxe4 dxe4 40.g7 a5 41.g8Q b5 42.Qh7+ Kd6 43.Qxe4 a4 44.bxa4 bxa4 45.Qxa4 Ke5 46.Qb4 Kf6 47.a4 Kf7
 25+	00:01	 8,147k	6,062k	+11.62	31.Qa3+
 25+	00:01	 8,164k	6,075k	+11.72	31.Qa3+
 25	00:01	 10,125k	6,170k	+11.79	31.Qa3+ Kb5 32.c4+ Rxc4 33.dxc4+ Kc6 34.Qa4+ Kd6 35.c5+ Kxc5 36.Rc7+ Kd6 37.Qxd4 Kxc7 38.g6 Be4+ 39.Qxe4 dxe4 40.g7 b5 41.g8Q Kd6 42.Qb8+ Kd5 43.Qxa7 Ke5 44.Qc5+ Kf4 45.Qxb5 Ke3 46.Qa5 Kd3 47.Qd5+ Ke3 48.Qb5 Kd2 49.Qb4+ Ke3
 26+	00:01	 11,450k	6,156k	+11.89	31.Qa3+
 26+	00:01	 11,789k	6,182k	+11.99	31.Qa3+
 26+	00:02	 15,112k	6,278k	+12.29	31.Qa3+
 26	00:02	 18,298k	6,434k	+12.64	31.Qa3+ Kb5 32.c4+ Rxc4 33.dxc4+ Kc6 34.Qa4+ Kd6 35.c5+ Kxc5 36.Rc7+ Kd6 37.Qxd4 Kxc7 38.g6 Be4+ 39.Qxe4 dxe4 40.g7 e3 41.g8Q Kd6 42.Qb8+ Kd5 43.Qxa7 Ke4 44.Kc2 e2 45.Qe7+ Kf3 46.Kd3 Kf4 47.Qxe2 b5 48.Qe4+ Kg5 49.Qe5+ Kg6 50.Qxb5 Kf7
 27+	00:03	 19,930k	6,507k	+12.74	31.Qa3+
 27+	00:03	 20,632k	6,535k	+12.84	31.Qa3+
 27+	00:03	 23,265k	6,676k	+13.01	31.Qa3+
 27	00:03	 25,784k	6,817k	+13.13	31.Qa3+ Kb5 32.c4+ Rxc4 33.dxc4+ Kc6 34.Qa4+ Kd6 35.c5+ Kxc5 36.Rc7+ Kd6 37.Qxd4 Kxc7 38.g6 Be4+ 39.Qxe4 dxe4 40.g7 b5 41.g8Q Kd6 42.Qb8+ Kd5 43.Qxa7 Ke5 44.Qb8+ Kd4 45.Qxb5 Ke3 46.Qb6+ Kd3 47.Qd6+ Ke2 48.Kc2 Kf3 49.Qf6+ Ke3 50.Qf5 Kd4 51.a4 e3
 28+	00:03	 25,903k	6,822k	+13.23	31.Qa3+
 28+	00:04	 27,763k	6,913k	+13.33	31.Qa3+
 28+	00:08	 66,556k	7,446k	+41.81	31.Qa3+
 28	00:09	 71,568k	7,471k	+M24	31.Qa3+ Kb5 32.c4+ Rxc4 33.dxc4+ Kc6 34.Qa4+ Kd6 35.Qd7+ Kc5 36.b4+ Kxc4 37.Qc6+ Kxb4 38.a3+ Kxa3 39.Rxa7+ Kb3 40.Qc2+ Kb4 41.Ra4+ Kb5 42.Rxd4 Bh1 43.Rh4 Bf3 44.Qb3+ Kc5 45.Qxf3 Kd6 46.g6 b5 47.g7 d4 48.Rxd4+ Kc5 49.Qc3+ Kb6 50.Rd6+ Kb7 51.g8Q
 29	00:09	 73,477k	7,452k	+M21	31.Qa3+ Kb5 32.c4+ Rxc4 33.dxc4+ Kc6 34.Qa4+ Kd6 35.Qd7+ Kc5 36.b4+ Kxc4 37.Qc6+ Kxb4 38.a3+ Kxa3 39.Rxa7+ Kb3 40.Qc2+ Kb4 41.Ra4+ Kb5 42.Rxd4 Bh1 43.Rh4 Be4 44.Rxe4 dxe4 45.Qxe4 Ka5 46.g6 b5 47.g7 Kb6 48.g8Q Kc5 49.Qgd5+ Kb6 50.Qd8+ Kc5
 30	00:10	 74,597k	7,448k	+M21	31.Qa3+ Kb5 32.c4+ Rxc4 33.dxc4+ Kc6 34.Qa4+ Kd6 35.Qd7+ Kc5 36.b4+ Kxc4 37.Qc6+ Kxb4 38.a3+ Kxa3 39.Rxa7+ Kb3 40.Qc2+ Kb4 41.Ra4+ Kb5 42.Rxd4 Bh1 43.Rh4 Be4 44.Rxe4 dxe4 45.Qxe4 Ka5 46.g6 b5 47.g7 Kb6 48.g8Q Kc5 49.Qgd5+ Kb6 50.Qd8+ Kc5 51.Qdd4+
 31	00:10	 78,804k	7,417k	+M20	31.Qa3+ Kb5 32.c4+ Rxc4 33.dxc4+ Kc6 34.Qa4+ Kd6 35.Qd7+ Kc5 36.b4+ Kxc4 37.Qc6+ Kxb4 38.a3+ Kxa3 39.Rxa7+ Kb3 40.Qc2+ Kb4 41.Ra4+ Kb5 42.Rxd4 Be4 43.Rxe4 dxe4 44.Qxe4 Ka5 45.g6 b5 46.g7 Kb6 47.g8Q Kc7 48.Qe7+ Kb6 49.Qb8+ Kc6 50.Qed6+
 32	00:10	 80,283k	7,382k	+M20	31.Qa3+ Kb5 32.c4+ Rxc4 33.dxc4+ Kc6 34.Qa4+ Kd6 35.Qd7+ Kc5 36.b4+ Kxc4 37.Qc6+ Kxb4 38.a3+ Kxa3 39.Rxa7+ Kb3 40.Qc2+ Kb4 41.Ra4+ Kb5 42.Rxd4 Be4 43.Rxe4 dxe4 44.Qxe4 Ka5 45.g6 b5 46.g7 Kb6 47.g8Q Kc7 48.Qe7+ Kb6 49.Qb8+ Kc6 50.Qed6+
 33	00:11	 81,030k	7,366k	+M20	31.Qa3+ Kb5 32.c4+ Rxc4 33.dxc4+ Kc6 34.Qa4+ Kd6 35.Qd7+ Kc5 36.b4+ Kxc4 37.Qc6+ Kxb4 38.a3+ Kxa3 39.Rxa7+ Kb3 40.Qc2+ Kb4 41.Ra4+ Kb5 42.Rxd4 Be4 43.Rxe4 dxe4 44.Qxe4 Ka5 45.g6 b5 46.g7 Kb6 47.g8Q Kc7 48.Qe7+ Kb6 49.Qb8+ Kc6 50.Qed6+
 34	00:11	 84,953k	7,347k	+M20	31.Qa3+ Kb5 32.c4+ Rxc4 33.dxc4+ Kc6 34.Qa4+ Kd6 35.Qd7+ Kc5 36.b4+ Kxc4 37.Qc6+ Kxb4 38.a3+ Kxa3 39.Rxa7+ Kb3 40.Qc2+ Kb4 41.Ra4+ Kb5 42.Rxd4 Be4 43.Rxe4 dxe4 44.Qxe4 Ka5 45.g6 b5 46.g7 Kb6 47.g8Q Kc7 48.Qe7+ Kb6 49.Qb8+ Kc6 50.Qed6+
 35	00:12	 91,678k	7,316k	+M20	31.Qa3+ Kb5 32.c4+ Rxc4 33.dxc4+ Kc6 34.Qa4+ Kd6 35.Qd7+ Kc5 36.b4+ Kxc4 37.Qc6+ Kxb4 38.a3+ Kxa3 39.Rxa7+ Kb3 40.Qc2+ Kb4 41.Ra4+ Kb5 42.Rxd4 Be4 43.Rxe4 dxe4 44.Qxe4 Ka5 45.g6 b5 46.g7 Kb6 47.g8Q Kc7 48.Qe7+ Kb6 49.Qb8+ Kc6 50.Qed6+
 36	00:13	 98,666k	7,275k	+M20	31.Qa3+ Kb5 32.c4+ Rxc4 33.dxc4+ Kc6 34.Qa4+ Kd6 35.Qd7+ Kc5 36.b4+ Kxc4 37.Qc6+ Kxb4 38.a3+ Kxa3 39.Rxa7+ Kb3 40.Qc2+ Kb4 41.Ra4+ Kb5 42.Rxd4 Be4 43.Rxe4 dxe4 44.Qxe4 Ka5 45.g6 b5 46.g7 Kb6 47.g8Q Kc7 48.Qe7+ Kb6 49.Qb8+ Kc6 50.Qed6+
 37	00:13	 99,827k	7,277k	+M20	31.Qa3+ Kb5 32.c4+ Rxc4 33.dxc4+ Kc6 34.Qa4+ Kd6 35.Qd7+ Kc5 36.b4+ Kxc4 37.Qc6+ Kxb4 38.a3+ Kxa3 39.Rxa7+ Kb3 40.Qc2+ Kb4 41.Ra4+ Kb5 42.Rxd4 Be4 43.Rxe4 dxe4 44.Qxe4 Ka5 45.g6 b5 46.g7 Kb6 47.g8Q Kc7 48.Qe7+ Kb6 49.Qb8+ Kc6 50.Qed6+
 38	00:14	 105,870k	7,270k	+M20	31.Qa3+ Kb5 32.c4+ Rxc4 33.dxc4+ Kc6 34.Qa4+ Kd6 35.Qd7+ Kc5 36.b4+ Kxc4 37.Qc6+ Kxb4 38.a3+ Kxa3 39.Rxa7+ Kb3 40.Qc2+ Kb4 41.Ra4+ Kb5 42.Rxd4 Be4 43.Rxe4 dxe4 44.Qxe4 Ka5 45.g6 b5 46.g7 Kb6 47.g8Q Kc7 48.Qe7+ Kb6 49.Qb8+ Kc6 50.Qed6+
 39	00:15	 114,187k	7,308k	+M20	31.Qa3+ Kb5 32.c4+ Rxc4 33.dxc4+ Kc6 34.Qa4+ Kd6 35.Qd7+ Kc5 36.b4+ Kxc4 37.Qc6+ Kxb4 38.a3+ Kxa3 39.Rxa7+ Kb3 40.Qc2+ Kb4 41.Ra4+ Kb5 42.Rxd4 Be4 43.Rxe4 dxe4 44.Qxe4 Ka5 45.g6 b5 46.g7 Kb6 47.g8Q Kc7 48.Qe7+ Kb6 49.Qb8+ Kc6 50.Qed6+
 40	00:16	 120,003k	7,307k	+M20	31.Qa3+ Kb5 32.c4+ Rxc4 33.dxc4+ Kc6 34.Qa4+ Kd6 35.Qd7+ Kc5 36.b4+ Kxc4 37.Qc6+ Kxb4 38.a3+ Kxa3 39.Rxa7+ Kb3 40.Qc2+ Kb4 41.Ra4+ Kb5 42.Rxd4 Be4 43.Rxe4 dxe4 44.Qxe4 Ka5 45.g6 b5 46.g7 Kb6 47.g8Q Kc7 48.Qe7+ Kb6 49.Qb8+ Kc6 50.Qed6+
 41	00:17	 127,674k	7,309k	+M20	31.Qa3+ Kb5 32.c4+ Rxc4 33.dxc4+ Kc6 34.Qa4+ Kd6 35.Qd7+ Kc5 36.b4+ Kxc4 37.Qc6+ Kxb4 38.a3+ Kxa3 39.Rxa7+ Kb3 40.Qc2+ Kb4 41.Ra4+ Kb5 42.Rxd4 Be4 43.Rxe4 dxe4 44.Qxe4 Ka5 45.g6 b5 46.g7 Kb6 47.g8Q Kc7 48.Qe7+ Kb6 49.Qb8+ Kc6 50.Qed6+
 42	00:18	 132,149k	7,316k	+M20	31.Qa3+ Kb5 32.c4+ Rxc4 33.dxc4+ Kc6 34.Qa4+ Kd6 35.Qd7+ Kc5 36.b4+ Kxc4 37.Qc6+ Kxb4 38.a3+ Kxa3 39.Rxa7+ Kb3 40.Qc2+ Kb4 41.Ra4+ Kb5 42.Rxd4 Be4 43.Rxe4 dxe4 44.Qxe4 Ka5 45.g6 b5 46.g7 Kb6 47.g8Q Kc7 48.Qe7+ Kb6 49.Qb8+ Kc6 50.Qed6+
 43	00:20	 153,008k	7,413k	+M20	31.Qa3+ Kb5 32.c4+ Rxc4 33.dxc4+ Kc6 34.Qa4+ Kd6 35.Qd7+ Kc5 36.b4+ Kxc4 37.Qc6+ Kxb4 38.a3+ Kxa3 39.Rxa7+ Kb3 40.Qc2+ Kb4 41.Ra4+ Kb5 42.Rxd4 Be4 43.Rxe4 dxe4 44.Qxe4 Ka5 45.g6 b5 46.g7 Kb6 47.g8Q Kc7 48.Qe7+ Kb6 49.Qb8+ Kc6 50.Qed6+
 44	00:21	 158,062k	7,411k	+M20	31.Qa3+ Kb5 32.c4+ Rxc4 33.dxc4+ Kc6 34.Qa4+ Kd6 35.Qd7+ Kc5 36.b4+ Kxc4 37.Qc6+ Kxb4 38.a3+ Kxa3 39.Rxa7+ Kb3 40.Qc2+ Kb4 41.Ra4+ Kb5 42.Rxd4 Be4 43.Rxe4 dxe4 44.Qxe4 Ka5 45.g6 b5 46.g7 Kb6 47.g8Q Kc7 48.Qe7+ Kb6 49.Qb8+ Kc6 50.Qed6+
 45	00:22	 168,032k	7,406k	+M20	31.Qa3+ Kb5 32.c4+ Rxc4 33.dxc4+ Kc6 34.Qa4+ Kd6 35.Qd7+ Kc5 36.b4+ Kxc4 37.Qc6+ Kxb4 38.a3+ Kxa3 39.Rxa7+ Kb3 40.Qc2+ Kb4 41.Ra4+ Kb5 42.Rxd4 Be4 43.Rxe4 dxe4 44.Qxe4 Ka5 45.g6 b5 46.g7 Kb6 47.g8Q Kc7 48.Qe7+ Kb6 49.Qb8+ Kc6 50.Qed6+
 46	00:25	 190,150k	7,411k	+M20	31.Qa3+ Kb5 32.c4+ Rxc4 33.dxc4+ Kc6 34.Qa4+ Kd6 35.Qd7+ Kc5 36.b4+ Kxc4 37.Qc6+ Kxb4 38.a3+ Kxa3 39.Rxa7+ Kb3 40.Qc2+ Kb4 41.Ra4+ Kb5 42.Rxd4 Be4 43.Rxe4 dxe4 44.Qxe4 Ka5 45.g6 b5 46.g7 Kb6 47.g8Q Kc7 48.Qe7+ Kb6 49.Qb8+ Kc6 50.Qed6+
 47	00:30	 224,619k	7,476k	+M20	31.Qa3+ Kb5 32.c4+ Rxc4 33.dxc4+ Kc6 34.Qa4+ Kd6 35.Qd7+ Kc5 36.b4+ Kxc4 37.Qc6+ Kxb4 38.a3+ Kxa3 39.Rxa7+ Kb3 40.Qc2+ Kb4 41.Ra4+ Kb5 42.Rxd4 Be4 43.Rxe4 dxe4 44.Qxe4 Ka5 45.g6 b5 46.g7 Kb6 47.g8Q Kc7 48.Qe7+ Kb6 49.Qb8+ Kc6 50.Qed6+
 48	00:32	 243,313k	7,468k	+M20	31.Qa3+ Kb5 32.c4+ Rxc4 33.dxc4+ Kc6 34.Qa4+ Kd6 35.Qd7+ Kc5 36.b4+ Kxc4 37.Qc6+ Kxb4 38.a3+ Kxa3 39.Rxa7+ Kb3 40.Qc2+ Kb4 41.Ra4+ Kb5 42.Rxd4 Be4 43.Rxe4 dxe4 44.Qxe4 Ka5 45.g6 b5 46.g7 Kb6 47.g8Q Kc7 48.Qe7+ Kb6 49.Qb8+ Kc6 50.Qed6+
 49	00:37	 277,626k	7,434k	+M20	31.Qa3+ Kb5 32.c4+ Rxc4 33.dxc4+ Kc6 34.Qa4+ Kd6 35.Qd7+ Kc5 36.b4+ Kxc4 37.Qc6+ Kxb4 38.a3+ Kxa3 39.Rxa7+ Kb3 40.Qc2+ Kb4 41.Ra4+ Kb5 42.Rxd4 Be4 43.Rxe4 dxe4 44.Qxe4 Ka5 45.g6 b5 46.g7 Kb6 47.g8Q Kc7 48.Qe7+ Kb6 49.Qb8+ Kc6 50.Qed6+
 50	00:41	 309,059k	7,444k	+M20	31.Qa3+ Kb5 32.c4+ Rxc4 33.dxc4+ Kc6 34.Qa4+ Kd6 35.Qd7+ Kc5 36.b4+ Kxc4 37.Qc6+ Kxb4 38.a3+ Kxa3 39.Rxa7+ Kb3 40.Qc2+ Kb4 41.Ra4+ Kb5 42.Rxd4 Be4 43.Rxe4 dxe4 44.Qxe4 Ka5 45.g6 b5 46.g7 Kb6 47.g8Q Kc7 48.Qe7+ Kb6 49.Qb8+ Kc6 50.Qed6+

[MOBMAT]

Another one

[d] 4k1r1/p7/1p2qB1p/2p5/8/1P1QP3/P1PP4/2K2R2 w - - 0 27

Forced mate in #11

Booot 6.3.1

Code: Select all

FEN: 4k1r1/p7/1p2qB1p/2p5/8/1P1QP3/P1PP4/2K2R2 w - - 0 27

Booot 6.3.1:
 21	00:00	 2,129k	8,034k	+19.44	27.Qd8+ Kf7 28.Bb2+ Kg6 29.Rg1+ Kh5 30.Rxg8 Qxg8 31.Qxg8 b5 32.Qe8+ Kg4 33.Qxb5 h5 34.Qd7+ Kg3 35.Qg7+ Kf2 36.Qxa7 c4 37.Qf7+ Kg2 38.Qxc4 Kg3 39.Qf4+ Kg2 40.Qg5+ Kf1
 22+	00:00	 2,428k	8,201k	+19.54	27.Qd8+
 22	00:00	 2,548k	8,166k	+19.57	27.Qd8+ Kf7 28.Bb2+ Kg6 29.Rg1+ Kh5 30.Rxg8 Qxg8 31.Qxg8 b5 32.Qe8+ Kg4 33.Qxb5 h5 34.Qd7+ Kg3 35.Qg7+ Kh3 36.Qxa7 c4 37.bxc4 Kg2 38.Qg7+ Kh3 39.Qg6 h4 40.Qf5+ Kg2
 23+	00:00	 2,795k	8,148k	+19.67	27.Qd8+
 23+	00:00	 3,093k	8,248k	+19.77	27.Qd8+
 23+	00:00	 6,765k	8,025k	+27.27	27.Qd8+
 23	00:01	 7,906k	7,789k	+27.88	27.Qd8+ Kf7 28.Bb2+ Kg6 29.Rg1+ Kh5 30.Rxg8 Qxg8 31.Qxg8 a5 32.Qd5+ Kg4 33.Qe6+ Kf3 34.Qxh6 a4 35.bxa4 c4 36.Qxb6 c3 37.Bxc3 Kg2 38.a5 Kf2 39.a6 Kg2 40.a7 Kh3
 24+	00:01	 7,947k	7,830k	+29.69	27.Qd8+
 24	00:01	 9,430k	7,742k	+M24	27.Qd8+ Kf7 28.Bb2+ Kg6 29.Rg1+ Kh5 30.Rxg8 Qxg8 31.Qxg8 a5 32.Qe8+ Kg5 33.Qd8+ Kf5 34.Qxb6 a4 35.Qxc5+ Ke6 36.Qc6+ Ke7 37.Qxa4 h5 38.Qh4+ Kd7 39.Qxh5 Kc6 40.Qh6+ Kd5 41.Qb6 Ke4 42.Qc6+ Kf5 43.Qf6+ Kg4 44.Qf4+ Kh3
 25	00:01	 12,559k	7,658k	+M11	27.Qd8+ Kf7 28.Bb2+ Kg6 29.Rg1+ Kh5 30.Rxg8 b5 31.Rg1 Qg6 32.Qd5+ Qg5 33.Qf7+ Kh4 34.Bf6 Kh3 35.Bxg5 Kh2 36.Qf2+ Kh3 37.Rg3+
 26	00:01	 13,210k	7,618k	+M11	27.Qd8+ Kf7 28.Bb2+ Kg6 29.Rg1+ Kh5 30.Rxg8 c4 31.Rg1 c3 32.Bxc3 b5 33.Qf8 Qd5 34.Bf6 Qg5 35.Qf7+ Kh4 36.Bxg5+ hxg5 37.Qh7+
 27	00:01	 14,326k	7,640k	+M11	27.Qd8+ Kf7 28.Bb2+ Kg6 29.Rg1+ Kh5 30.Rxg8 b5 31.Rg1 Qg6 32.Qd5+ Qg5 33.Qf7+ Kh4 34.Bf6 Kh3 35.Bxg5 Kh2 36.Qf2+ Kh3 37.Rg3+
 28	00:01	 14,994k	7,619k	+M11	27.Qd8+ Kf7 28.Bb2+ Kg6 29.Rg1+ Kh5 30.Rxg8 b5 31.Rg1 Qg6 32.Qd5+ Qg5 33.Qf7+ Kh4 34.Bf6 Kh3 35.Bxg5 Kh2 36.Qf2+ Kh3 37.Rg3+
 29	00:02	 16,261k	7,710k	+M11	27.Qd8+ Kf7 28.Bb2+ Kg6 29.Rg1+ Kh5 30.Rxg8 b5 31.Rg1 Qg6 32.Qd5+ Qg5 33.Qf7+ Kh4 34.Bf6 Kh3 35.Bxg5 Kh2 36.Qf2+ Kh3 37.Rg3+
 30	00:02	 17,641k	7,734k	+M11	27.Qd8+ Kf7 28.Bb2+ Kg6 29.Rg1+ Kh5 30.Rxg8 b5 31.Rg1 Qg6 32.Qd5+ Qg5 33.Qf7+ Kh4 34.Bf6 Kh3 35.Bxg5 Kh2 36.Qf2+ Kh3 37.Rg3+
 31	00:02	 22,576k	7,983k	+M11	27.Qd8+ Kf7 28.Bb2+ Kg6 29.Rg1+ Kh5 30.Rxg8 b5 31.Rg1 Qg6 32.Qd5+ Qg5 33.Qf7+ Kh4 34.Bf6 Kh3 35.Bxg5 Kh2 36.Qf2+ Kh3 37.Rg3+
 32	00:02	 23,659k	7,971k	+M11	27.Qd8+ Kf7 28.Bb2+ Kg6 29.Rg1+ Kh5 30.Rxg8 b5 31.Rg1 Qg6 32.Qd5+ Qg5 33.Qf7+ Kh4 34.Bf6 Kh3 35.Bxg5 Kh2 36.Qf2+ Kh3 37.Rg3+
 33	00:03	 27,986k	7,996k	+M11	27.Qd8+ Kf7 28.Bb2+ Kg6 29.Rg1+ Kh5 30.Rxg8 b5 31.Rg1 Qg6 32.Qd5+ Qg5 33.Qf7+ Kh4 34.Bf6 Kh3 35.Bxg5 Kh2 36.Qf2+ Kh3 37.Rg3+
 34	00:03	 28,745k	8,000k	+M11	27.Qd8+ Kf7 28.Bb2+ Kg6 29.Rg1+ Kh5 30.Rxg8 b5 31.Rg1 Qg6 32.Qd5+ Qg5 33.Qf7+ Kh4 34.Bf6 Kh3 35.Bxg5 Kh2 36.Qf2+ Kh3 37.Rg3+
 35	00:04	 36,760k	8,315k	+M11	27.Qd8+ Kf7 28.Bb2+ Kg6 29.Rg1+ Kh5 30.Rxg8 b5 31.Rg1 Qg6 32.Qd5+ Qg5 33.Qf7+ Kh4 34.Bf6 Kh3 35.Bxg5 Kh2 36.Qf2+ Kh3 37.Rg3+
 36	00:04	 38,721k	8,345k	+M11	27.Qd8+ Kf7 28.Bb2+ Kg6 29.Rg1+ Kh5 30.Rxg8 b5 31.Rg1 Qg6 32.Qd5+ Qg5 33.Qf7+ Kh4 34.Bf6 Kh3 35.Bxg5 Kh2 36.Qf2+ Kh3 37.Rg3+
 37	00:05	 42,431k	8,461k	+M11	27.Qd8+ Kf7 28.Bb2+ Kg6 29.Rg1+ Kh5 30.Rxg8 b5 31.Rg1 Qg6 32.Qd5+ Qg5 33.Qf7+ Kh4 34.Bf6 Kh3 35.Bxg5 Kh2 36.Qf2+ Kh3 37.Rg3+
 38	00:05	 48,083k	8,525k	+M11	27.Qd8+ Kf7 28.Bb2+ Kg6 29.Rg1+ Kh5 30.Rxg8 b5 31.Rg1 Qg6 32.Qd5+ Qg5 33.Qf7+ Kh4 34.Bf6 Kh3 35.Bxg5 Kh2 36.Qf2+ Kh3 37.Rg3+

[MOBMAT]

A mate in #10 at move 13

[d] rn1q1r2/pb2np1k/1p2p1pp/2pp3P/5PP1/1PBBPN2/P1PPQ3/R3K2R w KQ - 1 13

Booot 6.3.1 finds it in 17 or less

Code: Select all

FEN: rn1q1r2/pb2np1k/1p2p1pp/2pp3P/5PP1/1PBBPN2/P1PPQ3/R3K2R w KQ - 0 13

Booot 6.3.1:
 17	00:00	 1,332k	5,327k	+M10	13.hxg6+ Kg8 14.Qh2 fxg6 15.Ng5 Nf5 16.Bxf5 Qxg5 17.Bxe6+ Rf7 18.fxg5 Kf8 19.Qd6+ Ke8 20.Bxf7+ Kxf7 21.Rf1+ Ke8 22.Rf8+
 18	00:00	 1,356k	5,422k	+M10	13.hxg6+ Kg8 14.Qh2 fxg6 15.Ng5 Nf5 16.Bxf5 Qxg5 17.Bxe6+ Rf7 18.fxg5 Kf8 19.Qd6+ Ke8 20.Bxf7+ Kxf7 21.Rf1+ Ke8 22.Rf8+
 19	00:00	 1,507k	5,363k	+M10	13.hxg6+ Kg8 14.Qh2 fxg6 15.Ng5 Nf5 16.Bxf5 Qxg5 17.Bxe6+ Rf7 18.fxg5 Kf8 19.Qd6+ Ke8 20.Bxf7+ Kxf7 21.Rf1+ Ke8 22.Rf8+
 20	00:00	 1,625k	5,489k	+M10	13.hxg6+ Kg8 14.Qh2 fxg6 15.Ng5 Nf5 16.Bxf5 Qxg5 17.Bxe6+ Rf7 18.fxg5 Kf8 19.Qd6+ Ke8 20.Bxf7+ Kxf7 21.Rf1+ Ke8 22.Rf8+
 21	00:00	 1,785k	5,442k	+M10	13.hxg6+ Kg8 14.Qh2 fxg6 15.Ng5 Nf5 16.Bxf5 Qxg5 17.Bxe6+ Rf7 18.fxg5 Kf8 19.Qd6+ Ke8 20.Bxf7+ Kxf7 21.Rf1+ Ke8 22.Rf8+
 22	00:00	 2,042k	5,444k	+M10	13.hxg6+ Kg8 14.Qh2 fxg6 15.Ng5 Nf5 16.Bxf5 Qxg5 17.Bxe6+ Rf7 18.fxg5 Kf8 19.Qd6+ Ke8 20.Bxf7+ Kxf7 21.Rf1+ Ke8 22.Rf8+
 23	00:00	 2,758k	5,517k	+M10	13.hxg6+ Kg8 14.Qh2 fxg6 15.Ng5 Nf5 16.Bxf5 Qxg5 17.Bxe6+ Rf7 18.fxg5 Kf8 19.Qd6+ Ke8 20.Bxf7+ Kxf7 21.Rf1+ Ke8 22.Rf8+
 24	00:00	 3,326k	5,608k	+M10	13.hxg6+ Kg8 14.Qh2 fxg6 15.Ng5 Nf5 16.Bxf5 Qxg5 17.Bxe6+ Rf7 18.fxg5 Kf8 19.Qd6+ Ke8 20.Bxf7+ Kxf7 21.Rf1+ Ke8 22.Rf8+
 25	00:00	 4,262k	5,457k	+M10	13.hxg6+ Kg8 14.Qh2 fxg6 15.Ng5 Nf5 16.Bxf5 Qxg5 17.Bxe6+ Rf7 18.fxg5 Kf8 19.Qd6+ Ke8 20.Bxf7+ Kxf7 21.Rf1+ Ke8 22.Rf8+
 26	00:00	 4,750k	5,530k	+M10	13.hxg6+ Kg8 14.Qh2 fxg6 15.Ng5 Nf5 16.Bxf5 Qxg5 17.Bxe6+ Rf7 18.fxg5 Kf8 19.Qd6+ Ke8 20.Bxf7+ Kxf7 21.Rf1+ Ke8 22.Rf8+
 27	00:01	 7,416k	5,584k	+M10	13.hxg6+ Kg8 14.Qh2 fxg6 15.Ng5 Nf5 16.Bxf5 Qxg5 17.Bxe6+ Rf7 18.fxg5 Kf8 19.Qd6+ Ke8 20.Bxf7+ Kxf7 21.Rf1+ Ke8 22.Rf8+
 28	00:01	 9,576k	5,677k	+M10	13.hxg6+ Kg8 14.Qh2 fxg6 15.Ng5 Nf5 16.Bxf5 Qxg5 17.Bxe6+ Rf7 18.fxg5 Kf8 19.Qd6+ Ke8 20.Bxf7+ Kxf7 21.Rf1+ Ke8 22.Rf8+
 29	00:02	 12,056k	5,673k	+M10	13.hxg6+ Kg8 14.Qh2 fxg6 15.Ng5 Nf5 16.Bxf5 Qxg5 17.Bxe6+ Rf7 18.fxg5 Kf8 19.Qd6+ Ke8 20.Bxf7+ Kxf7 21.Rf1+ Ke8 22.Rf8+