Hello Mike:
MikeB wrote:[...] Real world, from real games , not proof games, the record as far I know is 79 moves. I performed a search once , using a move generator on 1 million games and found a game with 78 possible moves . I posted the game here, years ago - maybe 10 to 13 years ago.
The real game record:
https://timkr.home.xs4all.nl/records/re ... d%20pieces
I downloaded CCRL 40/4 games (CCRL-404.[2047025].pgn, so 2047025 games) and I found positions with perft(1) > 79. There is at least one position in this PGN with perft(1) = 85 because I saw that info while the fantastic tool
joined was running, before it was overwritten by other position with perft(1) = 89 and later by others with perft(1) = 98, perft(1) = 102 and perft(1) = 124. There might be other positions found later with 79 < perft(1) =< 124:
Code: Select all
.\joined>joined -h
Illegal option: h !
Usage: joined [<*.PGN, *.FEN or *.EPD file>] [-<options>]
Legal options are:
-p : Print messages to both stderr and stdout
-q : Quit after scanning input file
-r : Initial value for random algorithm
-s : Print messages only to stdout
-v<number>: Set verbose level to <number> (default 4)
The numbers may be added. The numbers are:
1: Print PGN
2: Calculate number of legal moves in all positions
4: Print progress (default)
8: Print all warnings
16: Check PGN
32: Report result = '*'
64: Get statistics on all types of moves
***** Error exit *****
.\joined>joined -q -v6 CCRL-404.[2047025].pgn
Scanning file CCRL-404.[2047025].pgn containing 2324578752 bytes !
[...]
Read 2047025 games with 282012002 moves, 53150521 lines, 2324578752 bytes !
Got max. 799 moves in game 1013473 before line 26659054 !
Got 3536229011 legal moves in 284059027 positons !
Got max. 124 legal moves after move 288 in game 892029 line 23469623 !
Verbose level -v6 is 2 + 4 = 6 ('Calculate number of legal moves in all positions' and 'Print progress').
Since I can only track the position with the maximum[perft(1)], the game where it arose is the following one:
[pgn][Event "CCRL 40/4"]
[Site "CCRL"]
[Date "2012.11.03"]
[Round "173.9.791"]
[White "GrayMatter SVN1604"]
[Black "Xadreco 5.7"]
[Result "1/2-1/2"]
[ECO "D00"]
[Opening "Queen's pawn game"]
[PlyCount "345"]
[WhiteElo "1215"]
[BlackElo "1026"]
1. d4 d5 2. c3 c6 3. Nf3 Bg4 4. Bf4 g6 5. Qb3 Bxf3 6. Qxb7 e5 7. Qxa8 exf4 8.
exf3 Qb6 9. b3 Kd7 10. Bd3 Bb4 11. cxb4 Kc7 12. Nc3 Qxd4 13. Nb5+ cxb5 14. Rc1+
Kd7 15. Bxb5+ Ke6 16. Qxb8 Ne7 17. Be8 f5 18. O-O Ng8 19. Rfd1 Qb2 20. Rc6+ Ke7
21. Re1+ Kf8 22. Bxg6+ Kg7 23. Qe8 Qd2 24. Bxf5 Qxa2 25. Qe5+ Kf7 26. Qxh8 Qb2
27. Qxb2 d4 28. Qxd4 Kf8 29. Rc8+ Kf7 30. Rc7+ Ne7 31. Bxh7 Kf8 32. Qf6+ Ke8
33. Bd3 a6 34. Rexe7+ Kd8 35. Rg7+ Ke8 36. Qd6 a5 37. b5 a4 38. Rge7+ Kf8 39.
Qxf4+ Kg8 40. bxa4 Kh8 41. Rh7+ Kg8 42. Rhg7+ Kh8 43. Rh7+ Kg8 44. Rhg7+ Kh8
45. Rge7 Kg8 46. b6 Kh8 47. b7 Kg8 48. h4 Kh8 49. Qh6+ Kg8 50. Qh7+ Kf8 51.
Qh6+ Kg8 52. Qh7+ Kf8 53. Rg7 Ke8 54. g4 Kd8 55. Bf5 Ke8 56. Bc8 Kd8 57. b8=Q
Ke8 58. Rgd7 Kf8 59. Qb5 Ke8 60. Qbh5+ Kf8 61. Qe4 Kg8 62. Qeh7+ Kf8 63. Qe4
Kg8 64. g5 Kf8 65. f4 Kg8 66. g6 Kf8 67. Rh7 Kg8 68. Be6+ Kf8 69. Bd7 Kg8 70.
Be6+ Kf8 71. Bd7 Kg8 72. Qed5+ Kf8 73. g7+ Ke7 74. g8=Q+ Kf6 75. Rh8 Ke7 76.
Rh7+ Kf6 77. Rh8 Ke7 78. Qb7 Kd6 79. Rh6+ Ke7 80. Qgg5+ Kf8 81. Rf6+ Ke7 82.
Re6+ Kf8 83. Qe7+ Kg8 84. Qhf7+ Kh8 85. Qf5 Kg8 86. a5 Kh8 87. a6 Kg8 88. a7
Kh8 89. Be8 Kg8 90. a8=Q Kh8 91. Qff6+ Kg8 92. Qff7+ Kh8 93. Qff6+ Kg8 94.
Qff7+ Kh8 95. Qh5+ Kg8 96. Qd7 Kf8 97. Qa3+ Kg8 98. Bf7+ Kg7 99. Be8+ Kg8 100.
Qaa7 Kf8 101. Rf6+ Kg8 102. Qhf7+ Kh8 103. Qh5+ Kg8 104. Qhf7+ Kh8 105. Qfe7
Kg8 106. f5 Kh8 107. h5 Kg8 108. Rf7 Kh8 109. Qe5+ Kg8 110. Qg3+ Kh8 111. Qe5+
Kg8 112. Qg3+ Kh8 113. Qgd3 Kg8 114. f6 Kh8 115. Rh7+ Kg8 116. f7+ Kf8 117.
Rh8+ Kg7 118. Rh7+ Kf6 119. Qad4+ Kg5 120. h6 Kh5 121. f8=Q+ Kg5 122. Rf7 Kh5
123. Re7+ Kg5 124. f4+ Kh4 125. Qd7d5 Kg4 126. h7 Kh4 127. h8=Q+ Kg4 128. Qhe5
Kh4 129. f5+ Kg5 130. Bc6 Kh5 131. Qde2+ Kg5 132. Qfg8+ Kh6 133. Qge6+ Kg5 134.
f6+ Kg6 135. Kf2 Kh6 136. f7+ Kh7 137. Qh3+ Kg6 138. Qhg3+ Kh6 139. Qh3+ Kg6
140. Qhg3+ Kh6 141. Qge3+ Kg6 142. Bd7 Kh7 143. f8=Q+ Kg6 144. Re6+ Kh7 145.
Re7+ Kg6 146. Re6+ Kh7 147. Qe7+ Kg8 148. Rf6+ Kh8 149. Rf7+ Kg8 150. Rf6+ Kh8
151. Qdc6 Kg8 152. Be6+ Kh8 153. Bf5 Kg8 154. Qda7 Kh8 155. Qh5+ Kg8 156. Bh7+
Kh8 157. Be4+ Kg8 158. Qhf7+ Kh8 159. Qfh5+ Kg8 160. Qhf7+ Kh8 161. Qg8+ Kxg8
162. Kf3 Kh8 163. Qcd7 Kg8 164. Qeb3+ Kh8 165. Qbd3 Kg8 166. Kg4 Kh8 167. Kf3
Kg8 168. Qdb3+ Kh8 169. Rf7+ Kg8 170. Rg7+ Kh8 171. Rf7+ Kg8 172. Rg7+ Kh8 173.
Rf7+ 1/2-1/2[/pgn]
The position with perft(1) = 124 is the next one just after 288 plies, as reported by
joined:
[d]5Q2/1QRB3k/4R3/3QQ3/3Q4/4Q3/4QK2/8 w - - 3 145
Which perft(1) = 124 was verified by
JetChess perft counter:
Code: Select all
JetChess 1.0.0.0:
5Q2/1QRB3k/4R3/3QQ3/3Q4/4Q3/4QK2/8 w - - 3 145
perft(1) = 124
--------------
1 Qe2-d3
2 Qe2-c4
3 Qe2-b5
4 Qe2-a6
5 Qe2-f3
6 Qe2-g4
7 Qe2-h5
8 Qe2-f1
9 Qe2-d1
10 Qe2-d2
11 Qe2-c2
12 Qe2-b2
13 Qe2-a2
14 Qe2-e1
15 Qe3-f4
16 Qe3-g5
17 Qe3-h6
18 Qe3-d2
19 Qe3-c1
20 Qe3-e4
21 Qe3-f3
22 Qe3-g3
23 Qe3-h3
24 Qe3-d3
25 Qe3-c3
26 Qe3-b3
27 Qe3-a3
28 Qd4-c5
29 Qd4-b6
30 Qd4-a7
31 Qd4-c3
32 Qd4-b2
33 Qd4-a1
34 Qd4-e4
35 Qd4-f4
36 Qd4-g4
37 Qd4-h4
38 Qd4-c4
39 Qd4-b4
40 Qd4-a4
41 Qd4-d3
42 Qd4-d2
43 Qd4-d1
44 Qd5-c6
45 Qd5-e4
46 Qd5-f3
47 Qd5-g2
48 Qd5-h1
49 Qd5-c4
50 Qd5-b3
51 Qd5-a2
52 Qd5-d6
53 Qd5-c5
54 Qd5-b5
55 Qd5-a5
56 Qe5-d6
57 Qe5-f6
58 Qe5-g7
59 Qe5-h8
60 Qe5-f4
61 Qe5-g3
62 Qe5-h2
63 Qe5-f5
64 Qe5-g5
65 Qe5-h5
66 Qe5-e4
67 Qb7-a8
68 Qb7-c8
69 Qb7-c6
70 Qb7-a6
71 Qb7-b8
72 Qb7-a7
73 Qb7-b6
74 Qb7-b5
75 Qb7-b4
76 Qb7-b3
77 Qb7-b2
78 Qb7-b1
79 Qf8-g7
80 Qf8-h6
81 Qf8-e7
82 Qf8-d6
83 Qf8-c5
84 Qf8-b4
85 Qf8-a3
86 Qf8-g8
87 Qf8-h8
88 Qf8-e8
89 Qf8-d8
90 Qf8-c8
91 Qf8-b8
92 Qf8-a8
93 Qf8-f7
94 Qf8-f6
95 Qf8-f5
96 Qf8-f4
97 Qf8-f3
98 Re6-e7
99 Re6-e8
100 Re6-f6
101 Re6-g6
102 Re6-h6
103 Re6-d6
104 Re6-c6
105 Re6-b6
106 Re6-a6
107 Rc7-c8
108 Rc7-c6
109 Rc7-c5
110 Rc7-c4
111 Rc7-c3
112 Rc7-c2
113 Rc7-c1
114 Bd7-c8
115 Bd7-e8
116 Bd7-c6
117 Bd7-b5
118 Bd7-a4
119 Kf2-g2
120 Kf2-f3
121 Kf2-g3
122 Kf2-e1
123 Kf2-f1
124 Kf2-g1
It is a real game since it is not a composition, although the level of the engines was really low. To force a threefold repetition with the winning side in a KQQQQQQRRB-vs-k position has its merit.
This task can be repeated with CCRL 40/40 games, CEGT, SSDF and so on. I chose CCRL 40/4 for its high amount of games.
Regards from Spain.
Ajedrecista.