Gentelmen, check your engines: 5-move mate puzzles - have fun

[Chessnut1071]

1R1Rn3/4K3/p7/kb4n1/6p6/PP6/3ppp2/1Q6 w 0 1 - A. Andersen (1846)
N1rb4/1p3p1p/1p6/1R5K/8/p3p1PN/1PP1R3/N6k w 0 1 - Sam Loyd (1876)
1r3n2/2pB1pq1/1bR3p1/N2NR2b/KP1kpp1r/1p2p3/1pp2Q1n/8 w 0 1 - Phil Klett (3 5-move mates)
8/4R3/8/1B1k4/4p1N1/8/8/6BK w 0 1 - William Shinkman (1903)
K7/8/1RK6/8/8/5N2/8/8 w 0 1 - William Shinkman (1903)
8/8/2B1N3/3rp3/4k2K/2r3Pn/1b1N4 w 0 1 - Johannes Kohtz (1865)
7k/8/5N1P/8/8/5bp1/8/B5K1 w 0 1 - Johannes Kohtz (1875)
8/6K1/8/2p2N1k/8/8/4N1P1/8 w 0 1 - Minoslav Havel (1918)

The puzzles above taken from Classic Chess Puzzles. All solutions are 5-move mate and relatively simple. Some have more than 1 forced 5 move mate.

enjoy

[MartinBryant]

The second FEN string (Sam Loyd) is incorrect. It should be...
n1rb4/1p3p1p/1p6/1R5K/8/p3p1PN/1PP1R3/N6k w 0 1
(N.B. a BLACK knight on a8, not a white knight as given.)
The position as it stands is a mate in 6 by the same b4.

[R. Tomasi]

For the first one, Pygmalion finds a mate in 5 (9 ply) with Qe1

Code: Select all

set-fen 1R1Rn3/4K3/p7/kb4n1/6p6/PP6/3ppp2/1Q6 w - -

New position: 1R1Rn3/4K3/p7/kb4n1/6p1/PP6/3ppp2/1Q6 w - -

debug-pvs 20

0:     +8.10156 - Rxe8 Bxe8 Rxe8
  15.0 N   in   56.5 mcs =>    265 kN/s

1:     +8.10156 - Rxe8 Bxe8 Rxe8
  35.0 N   in   37.5 mcs =>    933 kN/s

2:     +8.07812 - b4 Ka4 Rxb5 Kxb5 Rxe8
   885 N   in    607 mcs =>   1.46 MN/s

3:     +8.07812 - b4 Ka4 Rxb5 Kxb5 Rxe8
   999 N   in    514 mcs =>   1.94 MN/s

4:     +8.06445 - Rxb5 xb5 b4 Kb6 Rxe8
  9.95 kN  in   4.89 ms  =>   2.03 MN/s

5:     +8.06445 - Rxb5 xb5 b4 Kb6 Rxe8
  8.11 kN  in   3.46 ms  =>   2.34 MN/s

6:     +8.07227 - Rxb5 xb5 Ra8 Kb6 Qg6 Kb7 Rxe8
  26.4 kN  in   12.5 ms  =>   2.12 MN/s

7:     +8.07227 - Rxb5 xb5 Ra8 Kb6 Qg6 Kb7 Rxe8
  55.2 kN  in   22.7 ms  =>   2.43 MN/s

8:     +8.05469 - Rxb5 xb5 Ra8 Kb6 Qg6 Kb7 Qa6 Kc7 Rxe8
  1.29 MN  in    615 ms  =>   2.10 MN/s

9:     +8.05469 - Rxb5 xb5 Ra8 Kb6 Qg6 Kb7 Qa6 Kc7 Rxe8
   705 kN  in    309 ms  =>   2.28 MN/s

10:     +8.08984 - Rxb5 xb5 Ra8 Kb6 Qg6 Kc7 Ra7 Kb8 Qb6 Kc8 Kxe8
  1.88 MN  in    843 ms  =>   2.23 MN/s

11:     +8.08984 - Rxb5 xb5 Ra8 Kb6 Qg6 Kc7 Ra7 Kb8 Qb6 Kc8 Kxe8
  4.36 MN  in   1.93 s   =>   2.25 MN/s

12:      +11.127 - Rxb5 xb5 Ra8 Kb6 Qg6 Kc5 Qxg5 Kc6 Qg6 Kc7 Qc2 Kb6 Rxe8
  4.91 MN  in   2.00 s   =>   2.46 MN/s

13:      +11.127 - Rxb5 xb5 Ra8 Kb6 Qg6 Kc5 Qxg5 Kc6 Qg6 Kc7 Qc2 Kb6 Rxe8
  41.7 MN  in   18.6 s   =>   2.24 MN/s

14:          +M9 - Qe1 f1=N Rxd2 Nf3 Rd4 N1d2 Ra4 Bxa4 b4
   201 MN  in   80.0 s   =>   2.51 MN/s
   

[R. Tomasi]

Second one (with Martins corrections): Pygmalion says b4 is mate in 5:

Code: Select all

set-fen n1rb4/1p3p1p/1p6/1R5K/8/p3p1PN/1PP1R3/N6k w - -

New position: n1rb4/1p3p1p/1p6/1R5K/8/p3p1PN/1PP1R3/N6k w - -

debug-pvs 20

0:     +3.04883 - Rxe3 xb2 Rxb2
  15.0 N   in   76.8 mcs =>    195 kN/s

1:     +3.04883 - Rxe3 xb2 Rxb2
  38.0 N   in   39.2 mcs =>    969 kN/s

2:      +3.0293 - Rxe3 Kg2
   876 N   in    705 mcs =>   1.24 MN/s

3:     +3.03125 - Rxe3 Kg2 g4
  1.49 kN  in   1.03 ms  =>   1.44 MN/s

4:     +4.04883 - xa3 Rc5 Rxc5 xc5 Rxe3
  9.36 kN  in   6.30 ms  =>   1.49 MN/s

5:     +4.04883 - xa3 Rc5 Rxc5 xc5 Rxe3
  2.67 kN  in   1.24 ms  =>   2.14 MN/s

6:     +4.01758 - xa3 Rc5 Rxc5 xc5 c3 Nb6 Rxe3
  68.3 kN  in   34.7 ms  =>   1.97 MN/s

7:     +4.01758 - xa3 Rc5 Rxc5 xc5 c3 Nb6 Rxe3
  69.7 kN  in   31.6 ms  =>   2.21 MN/s

8:     +4.00781 - xa3 Rc5 Rxc5 xc5 Rxe3 Bf6 Nb3 Kg2
  1.31 MN  in    654 ms  =>   2.01 MN/s

9:     +6.08984 - b4 Bg5 Rf5 Bf4 xf4 Rc4 Rxf7 Rxb4 Rxe3
   854 kN  in    378 ms  =>   2.26 MN/s

10:     +7.04297 - b4 Bg5 Rf5 Bf4 xf4 f6 Rxe3 a2 Kh6 Rd8 Rxf6
   625 kN  in    276 ms  =>   2.27 MN/s

11:     +9.07422 - b4 Rc5 xc5 a2 c3 Bf6 Rxa2 e2 Rb1 Kh2 Rxa8 Kxh3 Rxb6 Bxc3 Rxb7
  2.44 MN  in   1.06 s   =>   2.31 MN/s

12:     +12.0879 - b4 Rc5 xc5 a2 xb6 Bc7 xc7 Nxc7 Rxb7 Nd5 Kh6 f6 Kxh7
  5.53 MN  in   2.18 s   =>   2.54 MN/s

13:          +M9 - b4 Rc5 xc5 a2 c6 f5 Rxf5 Nc7 Rf1
  40.7 MN  in   16.0 s   =>   2.54 MN/s

14:          +M9 - b4 Rc5 xc5 a2 c6 Bc7 xb7 Bd6 xa8=B
  78.9 MN  in   31.7 s   =>   2.49 MN/s

[R. Tomasi]

Fourth one: Pygmalion says Bb6 is a mate in 5

Code: Select all

set-fen 8/4R3/8/1B1k4/4p1N1/8/8/6BK w - -

New position: 8/4R3/8/1B1k4/4p1N1/8/8/6BK w - -

debug-pvs 20

0:     +13.1621 -
  3.00 N   in   35.7 mcs =>   84.0 kN/s

1:     +13.1934 - Be3
  40.0 N   in   36.7 mcs =>   1.09 MN/s

2:     +14.2031 - Nf6 Kd6 Rxe4
   138 N   in    104 mcs =>   1.32 MN/s

3:     +14.2031 - Nf6 Kd6 Rxe4
  1.31 kN  in    730 mcs =>   1.79 MN/s

4:     +14.2324 - Nf6 Kd6 Re8 Kc7 Nxe4
  2.82 kN  in   1.19 ms  =>   2.36 MN/s

5:     +14.2324 - Nf6 Kd6 Re8 Kc7 Nxe4
  29.7 kN  in   12.8 ms  =>   2.32 MN/s

6:      +14.248 - Nf6 Kd6 Re8 Kc7 Bc5 Kb7 Nxe4
  57.5 kN  in   22.4 ms  =>   2.57 MN/s

7:     +14.2578 - Nf6 Kd6 Rxe4 Kc7 Re8 Kb7 Be3
   583 kN  in    202 ms  =>   2.89 MN/s

8:     +14.2676 - Nh6 e3 Bxe3 Kd6 Re8 Kd5 Kg2 Kd6
  1.19 MN  in    448 ms  =>   2.67 MN/s

9:     +14.2812 - Bb6 Kd6 Re8 Kd5 Nf6 Kd6 Kg2 e3 Bxe3
  12.5 MN  in   4.33 s   =>   2.88 MN/s

10:          +M9 - Bb6 Kd6 Re8 Kd5 Nf6 Kd6 Bd7 e3 Re6
  19.3 MN  in   7.11 s   =>   2.71 MN/s

[R. Tomasi]

Fifth one seem's to have a typo in it (two white kings!?)

[Ajedrecista]

Hello:

Fifth one seem's to have a typo in it (two white kings!?)

According to the given source (the author), the black king is on a8:

https://yacpdb.org/#66398

Regards from Spain.

Ajedrecista.

[R. Tomasi]

Hello:

Fifth one seem's to have a typo in it (two white kings!?)

According to the given source (the author), the black king is on a8:

https://yacpdb.org/#66398

Regards from Spain.

Ajedrecista.

I think I still have the wrong position (?):

[fen]k7/8/1RK5/8/8/5N2/8/8 w - - 0 1[/fen]

Since the mate from the FEN-string that I posted above seems to be rather trivial:

Code: Select all

set-fen k7/8/1RK6/8/8/5N2/8/8 w - -

New position: k7/8/1RK5/8/8/5N2/8/8 w - -

debug-board

8|k.......
7|........
6|.RK.....
5|........
4|........
3|.....N..
2|........
1|........
-+--------
 |abcdefgh

____

Material: +8

Hash: b6c37a97a6a73b72

Signature: 3|1||1|0|1|0|0|2

Player + is on the move.

debug-pvs 20

0:     +8.16016 -
  1.00 N   in   40.4 mcs =>   24.8 kN/s

1:     +8.19531 - Kd7
  29.0 N   in    111 mcs =>    260 kN/s

2:     +8.18555 - Kd7 Ka7
  45.0 N   in   62.6 mcs =>    719 kN/s

3:     +8.19141 - Kd7 Ka7 Rb5
   544 N   in    524 mcs =>   1.04 MN/s

4:     +8.19336 - Kd7 Ka7 Rb5 Ka6
   904 N   in    670 mcs =>   1.35 MN/s

5:     +8.20898 - Kd5 Ka7 Kc5 Ka8 Kd4
  8.42 kN  in   4.91 ms  =>   1.71 MN/s

6:          +M5 - Kd7 Ka7 Kc7 Ka8 Ra6
  12.2 kN  in   6.89 ms  =>   1.78 MN/s

7:          +M5 - Kd7 Ka7 Kc7 Ka8 Ra6
  94.1 kN  in   71.0 ms  =>   1.33 MN/s

8:          +M5 - Kd7 Ka7 Kc7 Ka8 Ra6
   134 kN  in    101 ms  =>   1.33 MN/s

9:          +M5 - Kd7 Ka7 Kc7 Ka8 Ra6
   916 kN  in    435 ms  =>   2.11 MN/s

10:          +M5 - Kd7 Ka7 Kc7 Ka8 Ra6
  1.47 MN  in    727 ms  =>   2.03 MN/s

11:          +M5 - Kd7 Ka7 Kc7 Ka8 Ra6
  11.8 MN  in   4.91 s   =>   2.39 MN/s

12:          +M5 - Kd7 Ka7 Kc7 Ka8 Ra6
  22.1 MN  in   10.7 s   =>   2.07 MN/s

[JVMerlino]

I think I still have the wrong position (?):

It's supposed to be a black knight:

[d]k7/8/1RK5/8/8/5n2/8/8 w - -