Show me another underpromotion great game !

[Chessqueen]

[JohnWoe]

Mayhem 5.0 underpromotes ( 71. c8=N ) Then sacks the N and went to checkmate KQvkb.
Mayhem has knowledge about these endgames.

[pgn][Event "?"]
[Site "?"]
[Date "?"]
[Round "1.78"]
[White "Mayhem 5.0"]
[Black "Demolito 2021-03-28"]
[Result "1-0"]
[Termination "checkmate"]
[PlyCount "205"]
[FEN "r1bqkb1r/pppn1ppp/3p1n2/8/3pP3/2N2N1P/PPP2PP1/R1BQKB1R w KQkq - 0 1"]
[SetUp "1"]

{--------------
r . b q k b . r
p p p n . p p p
. . . p . n . .
. . . . . . . .
. . . p P . . .
. . N . . N . P
P P P . . P P .
R . B Q K B . R
white to play
--------------}
1. Nxd4 c6 2. g4 Nc5 3. Bg2 h6 4. Be3 Be7 5. Qd2 d5 6. exd5 cxd5 7. O-O-O
O-O 8. Rhg1 Nce4 9. Bxe4 Nxe4 10. Nxe4 dxe4 11. g5 hxg5 12. Bxg5 Bxg5 13.
Rxg5 Qf6 14. Rdg1 g6 15. h4 Be6 16. h5 Rfd8 17. Rxg6+ fxg6 18. Rxg6+ Qxg6
19. hxg6 Rd7 20. Qe3 Rad8 21. Qxe4 Bd5 22. Qh4 Re8 23. f3 a5 24. b3 b5 25.
Kb2 a4 26. Nxb5 axb3 27. axb3 Bxf3 28. Qg3 Bd1 29. Qf4 Ree7 30. Nc3 Kg7 31.
Qh4 Bf3 32. Qh7+ Kf6 33. Qh6 Kf5 34. Qh3+ Bg4 35. Qh4 Rg7 36. Qf2+ Kxg6 37.
Ne4 Bf5 38. Qb6+ Kh5 39. Qb5 Kg6 40. Qc6+ Kh5 41. Nf6+ Kg5 42. Nxd7 Rxd7
43. Ka3 Rd2 44. c4 Re2 45. Qd6 Re6 46. Qd8+ Kg6 47. Qf8 Ra6+ 48. Kb4 Rb6+
49. Ka4 Ra6+ 50. Kb5 Re6 51. Ka5 Re4 52. Qg8+ Kf6 53. Qd8+ Kf7 54. Qc7+ Re7
55. Qc5 Bg6 56. Qd5+ Kf8 57. b4 Ra7+ 58. Kb6 Re7 59. Qd8+ Re8 60. Qd6+ Kf7
61. Qc7+ Kg8 62. c5 Bf7 63. c6 Re6 64. Qd8+ Kg7 65. Kb7 Rg6 66. c7 Be6 67.
b5 Kf7 68. Qd4 Rg4 69. Qd2 Ke7 70. Qd8+ Kf7 71. c8=N Kg6 72. Qe8+ Kf6 73.
Qh8+ Kg6 74. Ne7+ Kf7 75. Nc6 Rg5 76. Nd8+ Ke7 77. b6 Rd5 78. Nc6+ Kf7 79.
Qh7+ Kf6 80. Qh6+ Kf7 81. Ka7 Bf5 82. Qh5+ Kf6 83. b7 Rd7 84. Qh8+ Kg5 85.
Kb6 Rxb7+ 86. Kxb7 Bg4 87. Ne5 Be6 88. Nf7+ Bxf7 89. Qe5+ Kg6 90. Kc6 Kh6
91. Qf5 Kg7 92. Kd7 Bg6 93. Qg5 Kf8 94. Ke6 Bf7+ 95. Kf6 Ke8 96. Qc5 Kd8
97. Qe7+ Kc8 98. Kxf7 Kb8 99. Qd7 Ka8 100. Ke8 Kb8 101. Kd8 Ka8 102. Kc7
Ka7 103. Qa4#
1-0

[/pgn]

[mvanthoor]

Mayhem 5.0 underpromotes ( 71. c8=N ) Then sacks the N and went to checkmate KQvkb.
Mayhem has knowledge about these endgames.

That's not an underpromotion because the knight does something special.

The engine just sees that, if it promotes to a queen, the opponent will immediately take it because BxQ is a good trade for the oppoent. Effectively, white wins 2 pawns of material. If white promotes to a knight, which is probably worth slightly less in your evaluation, it assumes the opponent won't take, as BxN is a bad trade, and thus the gain is a bit more than three pawns.

[JVMerlino]

Mayhem 5.0 underpromotes ( 71. c8=N ) Then sacks the N and went to checkmate KQvkb.
Mayhem has knowledge about these endgames.

Very suboptimal play. 71.c8=Q is a mate in 15. Underpromoting to Knight is much worse, although of course it still wins.

[Andrew]

Mayhem 5.0 underpromotes ( 71. c8=N ) Then sacks the N and went to checkmate KQvkb.
Mayhem has knowledge about these endgames.

Very suboptimal play. 71.c8=Q is a mate in 15. Underpromoting to Knight is much worse, although of course it still wins.

The other underpromotions are all also winning, not sure of exact distances but not far off the queen promotion.
Also many queen and king moves. b6 even is #14 or less.

All/(most) roads lead to Rome?

Andrew

[Andrew]

Stockfish 300521 multipvs, after about 25 mins on 4 threads:

Mayhem 5.0 - Demolito 2021-03-28 1-0 1.78
3Q4/1KP2k2/4b3/1P6/6r1/8/8/8 w - - 0 1

Analysis by Stockfish 300521:

1. +- (#14): 71.b6 Rg2 72.Qd6 Rf2 73.Kb8 Re2 74.b7 Rb2 75.c8R Bxc8 76.Kxc8 Rb1 77.b8Q Rxb8+ 78.Kxb8 Kg7 79.Kc8 Kf7 80.Kd8 Kg7 81.Ke7 Kg8 82.Qg3+ Kh8 83.Kf7 Kh7 84.Qh4#
2. +- (#15): 71.c8R Bxc8+ 72.Qxc8 Rg5 73.b6 Kg7 74.Qe6 Kh7 75.Kc6 Rg6 76.Qxg6+ Kxg6 77.Kd5 Kf5 78.b7 Kf4 79.b8Q+ Kf3 80.Qe5 Kf2 81.Ke4 Kg2 82.Qb8 Kh1 83.Kf3 Kg1 84.Qg3+ Kf1 85.Qf2#
3. +- (#15): 71.c8B Bxc8+ 72.Qxc8 Rg5 73.b6 Kg7 74.Qe6 Kh7 75.Kc6 Rg6 76.Qxg6+ Kxg6 77.Kd5 Kf5 78.b7 Kf4 79.b8Q+ Kf3 80.Qe5 Kf2 81.Ke4 Kg2 82.Qb8 Kh1 83.Kf3 Kg1 84.Qg3+ Kf1 85.Qf2#
4. +- (#15): 71.c8Q Bxc8+ 72.Qxc8 Rg5 73.b6 Kg7 74.Qe6 Kh7 75.Kc6 Rg6 76.Qxg6+ Kxg6 77.Kd5 Kf5 78.b7 Kf4 79.b8Q+ Kf3 80.Qe5 Kf2 81.Ke4 Kg2 82.Qb8 Kh1 83.Kf3 Kg1 84.Qg3+ Kf1 85.Qf2#
5. +- (#15): 71.Qd2 Rc4 72.b6 Rc5 73.Kb8 Rb5 74.b7 Kf6 75.Ka7 Rxb7+ 76.Kxb7 Kg6 77.Qf4 Bd5+ 78.Kb8 Be6 79.c8Q Bxc8 80.Kxc8 Kh7 81.Kd8 Kg6 82.Ke7 Kh5 83.Qg3 Kh6 84.Kf6 Kh5 85.Qh3#
6. +- (#15): 71.Qd3 Ra4 72.b6 Rb4 73.Qd6 Rc4 74.Kb8 Rc2 75.b7 Rb2 76.c8R Bxc8 77.Kxc8 Rb1 78.b8Q Rxb8+ 79.Kxb8 Kg7 80.Kc8 Kf7 81.Kd8 Kg7 82.Ke7 Kg8 83.Qg3+ Kh8 84.Kf7 Kh7 85.Qh4#
7. +- (#15): 71.Qd6 Rg6 72.Ka7 Bc8 73.Qe5 Re6 74.Qd5 Kf8 75.b6 Re1 76.Qd8+ Re8 77.b7 Bxb7 78.Qf6+ Kg8 79.Kxb7 Kh7 80.Qf7+ Kh6 81.Qxe8 Kg5 82.Qe3+ Kf5 83.c8Q+ Kg6 84.Qg8+ Kf5 85.Qgg5#
8. +- (#16): 71.Qh8 Ra4 72.Qe5 Bg4 73.Kb8 Rb4 74.c8R Bxc8 75.Kxc8 Rc4+ 76.Kd7 Ra4 77.b6 Kg6 78.Qd6+ Kh7 79.Qd3+ Kh6 80.b7 Rg4 81.b8Q Rg7+ 82.Ke6 Rg6+ 83.Qxg6+ Kxg6 84.Qg3+ Kh6 85.Kf6 Kh5 86.Qh3#
9. +- (#16): 71.Qd1 Ke7 72.Qd8+ Kf7 73.b6 Rg2 74.Qd6 Rf2 75.Kb8 Re2 76.b7 Rb2 77.c8R Bxc8 78.Kxc8 Rb1 79.b8Q Rxb8+ 80.Kxb8 Kg7 81.Kc8 Kf7 82.Kd8 Kg7 83.Ke7 Kg8 84.Qg3+ Kh8 85.Kf7 Kh7 86.Qh4#
10. +- (#16): 71.Kb8 Rb4 72.Qd3 Bg4 73.c8Q Bxc8 74.Kxc8 Rf4 75.b6 Ke6 76.Qe3+ Kf5 77.b7 Kg4 78.Qc5 Rf5 79.Qc4+ Kf3 80.Kd7 Rh5 81.Qd3+ Kf2 82.b8Q Rh7+ 83.Qxh7 Ke3 84.Qh3+ Kd2 85.Qb2+ Kd1 86.Qf1#
11. +- (#16): 71.Kc6 Rg6 72.Kb7 Rf6 73.b6 Rf2 74.Kb8 Rb2 75.Qd6 Re2 76.b7 Rb2 77.c8R Bxc8 78.Kxc8 Rb1 79.b8Q Rxb8+ 80.Kxb8 Kg7 81.Kc8 Kf7 82.Kd8 Kg7 83.Ke7 Kg8 84.Qg3+ Kh8 85.Kf7 Kh7 86.Qh4#
12. +- (#17): 71.Ka8 Ra4+ 72.Kb8 Rb4 73.Qd3 Bg4 74.c8Q Bxc8 75.Kxc8 Rf4 76.b6 Ke6 77.Qe3+ Kf5 78.b7 Kg4 79.Qc5 Rf5 80.Qc4+ Kf3 81.Kd7 Rh5 82.Qd3+ Kf2 83.b8Q Rh7+ 84.Qxh7 Ke3 85.Qh3+ Kd2 86.Qb2+ Kd1 87.Qf1#
13. +- (#17): 71.Ka7 Ra4+ 72.Kb8 Rb4 73.Qd3 Bg4 74.c8Q Bxc8 75.Kxc8 Rf4 76.b6 Ke6 77.Qe3+ Kf5 78.b7 Kg4 79.Qc5 Rf5 80.Qc4+ Kf3 81.Kd7 Rh5 82.Qd3+ Kf2 83.b8Q Rh7+ 84.Qxh7 Ke3 85.Qh3+ Kd2 86.Qb2+ Kd1 87.Qf1#
14. +- (#17): 71.Kb6 Ra4 72.Kb7 Bf5 73.c8Q Bxc8+ 74.Qxc8 Kf6 75.b6 Re4 76.Qc6+ Re6 77.Qxe6+ Kxe6 78.Kc6 Ke5 79.b7 Ke4 80.b8Q Kf3 81.Kd5 Ke3 82.Qg3+ Kd2 83.Qf3 Kc2 84.Kc4 Kc1 85.Qe2 Kb1 86.Kc3 Kc1 87.Qe1#
15. +- (#17): 71.Ka6 Ra4+ 72.Kb7 Bf5 73.c8Q Bxc8+ 74.Qxc8 Kf6 75.b6 Re4 76.Qc6+ Re6 77.Qxe6+ Kxe6 78.Kc6 Ke5 79.b7 Ke4 80.b8Q Kf3 81.Kd5 Ke3 82.Qg3+ Kd2 83.Qf3 Kc2 84.Kc4 Kc1 85.Qe2 Kb1 86.Kc3 Kc1 87.Qe1#
16. +- (#17): 71.c8N Rg7 72.Ne7 Rg5 73.Kc7 Bb3 74.Qd3 Bc2 75.Qxc2 Kxe7 76.b6 Rg7 77.Kc6 Ke6 78.Qc4+ Kf6 79.b7 Rxb7 80.Kxb7 Kg5 81.Qe4 Kh5 82.Qg2 Kh4 83.Kc6 Kh5 84.Kd6 Kh6 85.Ke5 Kh5 86.Kf5 Kh6 87.Qg6#
17. +- (#18): 71.Qb8 Bd5+ 72.Kb6 Be6 73.c8Q Bxc8 74.Qxc8 Rg5 75.Qd7+ Kg6 76.Kc6 Rg1 77.Qd3+ Kh6 78.b6 Rg6+ 79.Qxg6+ Kxg6 80.Kd5 Kf5 81.b7 Kf4 82.b8Q+ Kf3 83.Qe5 Kf2 84.Ke4 Kg2 85.Qb8 Kh1 86.Kf3 Kg1 87.Qg3+ Kf1 88.Qf2#
18. +- (152.64): 71.Qc8 Bxc8+
19. +- (152.63): 71.Qa8 Bd5+ 72.Kb6 Bxa8 73.c8Q
20. = (0.00): 71.Qd4 Rxd4
White mates

(, 17.06.2021)

[JohnWoe]

Mayhem 5.0 underpromotes ( 71. c8=N ) Then sacks the N and went to checkmate KQvkb.
Mayhem has knowledge about these endgames.

That's not an underpromotion because the knight does something special.

The engine just sees that, if it promotes to a queen, the opponent will immediately take it because BxQ is a good trade for the oppoent. Effectively, white wins 2 pawns of material. If white promotes to a knight, which is probably worth slightly less in your evaluation, it assumes the opponent won't take, as BxN is a bad trade, and thus the gain is a bit more than three pawns.

This is tricky because Mayhem only considers underpromotions if they are 3+ pawns better than =Q.
I guess this =N is because of low depth. These were 10s+0.1s games. Mayhem has moveoverhead for increment also. Since 1ns + 100ms. If you use all of the increment you'll lose on time everytime.
That's why I've added all these KQvKB/KQvKN ... heuristics so it doesn't matter.

Mayhem 5.0 underpromotes ( 71. c8=N ) Then sacks the N and went to checkmate KQvkb.
Mayhem has knowledge about these endgames.

Very suboptimal play. 71.c8=Q is a mate in 15. Underpromoting to Knight is much worse, although of course it still wins.

Letting Mayhem search for a while nice row of c8=Q. Only depth 6 has c8=N which was played in 10s+0.1s.
For such short TC. This was a nice game. Opposite side castling, beautiful king side attack, underpromotion ...

Code: Select all

exclude: none best +tail                                          
dep	score	nodes	time	(not shown:  tbhits	knps	seldep)
 23	+15,52 	7,04G	17:28.58	c8=Q 
 22	+15,52 	2,88G	7:22.10	c8=Q 
 21	+14,86 	1,44G	3:43.08	c8=Q 
 20	+14,74 	903,4M	2:20.40	c8=Q 
 19	+14,57 	304,4M	0:48.14	c8=Q 
 18	+14,64 	163,8M	0:26.58	c8=Q 
 17	+14,17 	74,9M  	0:12.35	c8=Q 
 16	+14,13 	38,8M  	0:06.63	c8=Q 
 15	+13,75 	17,0M  	0:03.02	c8=Q 
 14	+13,07 	8,57M  	0:01.56	c8=Q 
 13	+11,56 	2,95M  	0:00.62	c8=Q 
 12	+11,40 	1,71M  	0:00.41	c8=Q 
 11	+6,75 	728220	0:00.24	c8=Q 
 10	+6,81 	500331	0:00.20	c8=Q 
  9	+6,60 	392241	0:00.18	c8=Q 
  8	+6,73 	339575	0:00.17	c8=Q 
  7	+5,11 	144137	0:00.13	Qh8 
  6	+6,60 	70053  	0:00.07	c8=N 
  5	+5,01 	26740  	0:00.03	Qh8 
  4	+6,61 	6816    	0:00.01	Qh8 
  3	+6,69 	3476    	0:00.01	Qd6 
  2	+6,77 	580      	0:00.00	Qd6 
  1	+7,57 	58        	0:00.00	Qd6 
  0	# 

[Ajedrecista]

Hello:

There are many games with knight underpromotions giving checkmate or involving knight underpromotions in order to get huge advantages like forks, although it depends on each one to consider them great games or not.

I found a brief collection of games with underprotions at ChessGames:

Underpromotions

I also found two very similar games that shocked me! Knight underpromotions giving checkmate in less than ten moves. Those games were unknown for me:

[pgn][Event "Strasbourg"]
[Site "Strasbourg"]
[Date "1880.??.??"]
[EventDate "1880.??.??"]
[Round "?"]
[Result "0-1"]
[White "Wiede"]
[Black "Alphonse Goetz"]
[ECO "C33"]
[WhiteElo "?"]
[BlackElo "?"]
[PlyCount "14"]

1. e4 e5 2. f4 exf4 3. b3 Qh4+ 4. g3 fxg3 5. h3 g2+ 6. Ke2
Qxe4+ 7. Kf2 gxh1=N# 0-1

[Event "Murau"]
[Site "Murau AUT"]
[Date "1936.??.??"]
[EventDate "?"]
[Round "?"]
[Result "1-0"]
[White "H Reinle"]
[Black "Lange"]
[ECO "C30"]
[WhiteElo "?"]
[BlackElo "?"]
[PlyCount "15"]

1.e4 e5 2.f4 f5 3.exf5 e4 4.Qh5+ g6 5.fxg6 h6 6.g7 Ke7 7.Qe5+
Kf7 8.gxh8=N# 1-0[/pgn]

Then a bishop underpromotion comes just to say 'I am the boss. Period':

[pgn][Event "Leningrad Championship"]
[Site "Leningrad"]
[Date "1972.??.??"]
[EventDate "?"]
[Round "?"]
[Result "1-0"]
[White "Aron G Reshko"]
[Black "Oleg Kaminsky"]
[ECO "A29"]
[WhiteElo "?"]
[BlackElo "?"]
[PlyCount "141"]

1.c4 Nf6 2.Nc3 e5 3.Nf3 Nc6 4.g3 d5 5.cxd5 Nxd5 6.Bg2 Nb6
7.O-O Be7 8.a4 a5 9.b3 O-O 10.Bb2 Be6 11.Nb5 Bf6 12.Rc1 Qc8
13.d4 Rd8 14.e4 exd4 15.e5 Be7 16.Nfxd4 Nxd4 17.Bxd4 c6 18.Qe2
Nd5 19.Bb2 Nc7 20.Nd4 Bd5 21.f4 Bxg2 22.Kxg2 Bb4 23.f5 c5
24.e6 cxd4 25.Qe5 Bc3 26.Bxc3 f6 27.Qe2 dxc3 28.Rxc3 Rd6
29.Rd1 Rc6 30.Rcd3 Ne8 31.Qh5 Rc7 32.Rd7 Rxd7 33.exd7 Qd8
34.Qf3 Nc7 35.Qxb7 Kf8 36.Rc1 Qxd7 37.Rxc7 Qd2+ 38.Kf3 Qd1+
39.Kf4 Qd4+ 40.Qe4 Qd6+ 41.Kg4 Re8 42.Qc4 Re4+ 43.Qxe4 Qxc7
44.b4 axb4 45.Qxb4+ Kg8 46.a5 h6 47.a6 Kh7 48.Qd4 Qa5 49.a7
Qa6 50.Kh4 Qa2 51.h3 Qa5 52.Qd7 Qb4+ 53.Kh5 Qa3 54.Kg4 Qe3
55.h4 Qe4+ 56.Kh5 Qf3+ 57.g4 Qe4 58.Qf7 Qc6 59.Qe7 Qd5 60.Qe8
Qb7 61.a8=B Qb3 62.Qd7 Qg8 63.Bd5 Qf8 64.Bf7 Kh8 65.Qe8 Qxe8
66.Bxe8 Kh7 67.Bf7 Kh8 68.Kg6 h5 69.Kxh5 Kh7 70.Be8 Kg8 71.Kg6
1-0[/pgn]

It is said that reactions of the losing sides were something like that:

https://www.youtube.com/watch?v=t-4ADaq9og4



Other example of bishop underpromotions is shown in this example (not a full game) found at the kibitzing of Reshko - Kaminsky game:

[d]k1n5/p1K1P3/P7/8/8/8/8/8 w - - 0 1

Solution: 1.- e8=B, Ne7; 2.- Bf7, Nc6; 3.- Bg6, {any}; 4.- Be4+, Nc6; 5.- Bxd5#. (Highlight with the mouse to see the solution).

Regards from Spain.

Ajedrecista.