Purdue FOSCEC Season 4 Classic TLCV Broadcast

[Gusev]

[pgn]
[Site " Purdue FOSCEC Season 4"]
[Date "06-05-2017"]
[White "McBrain 2.1a 64 BMI2 "]
[Black "Octochess revision 5190 "]
[Result "1-0"]
[TimeControl "012030 "]

1. e4 e6 2. Nf3 d5 3. Nc3 d4 4. Ne2 c5 5. c3 Nf6 6. cxd4 cxd4 7. e5
Nfd7 8. Nexd4 Nxe5 9. Bb5 Nec6 10. O-O Be7 11. Nb3 O-O 12. d4 b6
13. Qe2 Bb7 14. Bf4 a6 15. Bc4 Nb4 16. a3 Nd5 17. Bg3 Nd7 18. Rac1
N7f6 19. Ne5 g6 20. Nd2 Nh5 21. Ndf3 Re8 22. Bb3 Bf8 23. Qd2 f6 24. Ng4
Re7 25. Kh1 Bg7 26. Rfd1 Qd7 27. Re1 Rae8 28. Rc2 Kh8 29. Kg1 Qd8
30. Rec1 Qd7 31. Re1 Kg8 32. Kh1 Qd8 33. Rcc1 Kh8 34. Rc2 Rd7 35. Rec1
Nxg3 36. hxg3 Rd6 37. Ne3 Bh6 38. Bxd5 Rxd5 39. Qe2 Rd7 40. b4 Rde7
41. a4 Qd6 42. b5 axb5 43. axb5 Kg8 44. Ng4 Bg7 45. Ne3 Bf8 46. Ng4
Rf7 47. Ne3 Qd8 48. Kg1 Bd6 49. Ra1 Rd7 50. Rcc1 Kg7 51. Rd1 Ree7
52. Qb2 Qc8 53. Nd2 Qe8 54. Ndc4 Bc7 55. Rdc1 Qd8 56. Rd1 h5 57. Ra7
Qb8 58. Ra4 Qd8 59. Ra7 Bb8 60. Ra2 Re8 61. Qc3 Qc7 62. Rc2 Rh8 63. Qe1
Qd8 64. f3 Bc7 65. Rcd2 Qe7 66. Re2 Rhd8 67. Red2 Qb4 68. Rb1 Bxg3
69. Qd1 Qe7 70. Nxb6 Bf4 71. Rb3 Rc7 72. Kf1 h4 73. Na4 h3 74. gxh3
e5 75. d5 Qd7 76. Ke2 Rh8 77. Qg1 Rxh3 78. Nb6 Bxe3 79. Qxe3 Qf5
80. Qe4 Qh5 81. Nc4 Rh4 82. Qxh4 Qxh4 83. Ne3[/pgn]

[petero2]

Bobcat - Texel 1-0, Protector and Octochess are playing Ruy Lopez right now.

It looks like pondering (permanent brain) was enabled in this game. From the pgn file:

Code: Select all

    move   expected  score/     thinking
           reply     depth      time
 1. e4     c7-c5     +0.27/29   211
    e5     Ng1-f3    -0.31/14   419
 2. Nf3    Nb8-c6    +0.28/31   208
    Nc6    Bf1-b5    -0.26/14   251
 3. Bb5    Nc6-d4    +0.32/31   135
    Nd4    Nf3xd4    -0.47/14   318
 4. Nxd4   e5xd4     +0.32/31   339
    exd4   O-O       -0.47/14     0
 5. O-O    Bf8-c5    +0.27/31   364
    c6     Bb5-c4    -0.47/14     1
 6. Bc4    a7-a5     +0.46/30   453
    Nf6    Rf1-e1    -0.23/15   171
 7. Re1    Bf8-c5    +0.55/32   425
    Bc5    e4-e5     -0.19/16     0
 8. b4     Bc5-b6    +0.68/32   173
    Bxb4   c2-c3     -0.72/13   318
 9. e5     Nf6-d5    +0.67/35   201
    Nd5    c2-c3     -0.48/14   299
10. c3     Bb4-e7    +0.68/35    31
    dxc3   Nb1xc3    -0.67/15   334
11. dxc3   Bb4-e7    +0.84/33   162
    Bc5    Qd1-g4    -0.40/14   285
12. Nd2    b7-b5     +1.04/32   209
    O-O    Nd2-e4    -0.81/12   341
13. Ne4    d7-d6     +1.23/29   203
    Qa5    Qd1-d3    -1.06/13   100
14. Bxd5   Bc5xf2+   +3.06/29   200
    cxd5   Ne4xc5    -0.12/13   250
15. Nf6+   Kg8-h8    +4.86/29   136
    Kh8    Bc1-g5    -1.96/13   318
16. Bh6    Rf8-g8    +5.34/34   308
    d6     Qd1-f3    -0.81/11   305
17. Qh5    Rf8-g8    +9.59/28   238
    Bxf2+  Kg1-h1    -3.42/11   240
18. Kh1    Rf8-g8   +10.92/28   139
    Rg8    Nf6xg8    -6.75/15   124
19. Nxg8   Bc8-e6   +11.29/29   199
    Qd8    Qh5xf7    -7.53/14   257
20. Qxf7   Qd8xg8   +11.76/29   127
    gxh6   Ng8-e7    -8.12/16    60
21. Qxf2   -        +16.65/30   275
    Be6    e5xd6   -317.77/25   679
22. exd6   Qd8xd6    +M180/31   152
    Qxd6   Ng8xh6   -18.31/19     0
23. Nxh6   Qd6-f8     +M43/30   251
    Kg7    Qf2-d4+  -16.90/15   157

Note that texel replied instantly at moves 4, 5, 7 and 22. There are only three cases in which texel will reply instantly:

1. If there is only one legal move.
2. If the best move leads to a mate in N and texel has searched at least 2*N plies.
3. If texel has been pondering, got a ponder hit, and has already pondered as long as it normally would have thought without a ponder hit.

Since case 1 and 2 are not applicable in this game, the logical conclusion is that pondering was enabled. It can also be seen that the correct response was predicted the move before each instant move and the opponent thinking time was long enough to satisfy case 3.

Also black's move 21 is the only time in this game where texel reached a reasonable search depth, and it is also the only time in the game where the opponent could not have been pondering, since it only produced a 1-ply PV on the previous move.

It seems pondering has something to do with why texel searched extremely slowly in this game.

[Gusev]

[pgn]
[Site " Purdue FOSCEC Season 4"]
[Date "06-06-2017"]
[White " OpenCritter v1.1.37 "]
[Black "Toga II 3.0 "]
[Result "1-0"]
[TimeControl "012030 "]

1. d4 d5 2. c4 e6 3. Nf3 Nf6 4. Nc3 Be7 5. Bf4 O-O 6. e3 Nc6 7. cxd5
Nxd5 8. Bg3 f5 9. Bc4 g5 10. h3 Nxc3 11. bxc3 Bd6 12. O-O Qe7 13. Qc2
Kh8 14. Rab1 b6 15. e4 f4 16. Bh2 Qg7 17. e5 Na5 18. Bd3 Be7 19. Be4
Ba6 20. Bxa8 Bxf1 21. Be4 Ba6 22. Rd1 h5 23. Ne1 c6 24. Nd3 Bc4 25. h4
Bd5 26. Qe2 f3 27. gxf3 gxh4 28. Kh1 Qh6 29. Nb4 Bc4 30. Qc2 h3 31. Nxc6
Nxc6 32. Bxc6 h4 33. a4 Rg8 34. f4 Qh5 35. Re1 Rc8 36. Be4 Rg8 37. Qd2
Rg2 38. Bxg2 hxg2 39. Kg1 Qf5 40. Qd1 h3 41. Qb1 Qxb1 42. Rxb1 Bd3
43. Rc1 Bf5 44. c4 Ba3 45. Re1 Kg7 46. Re3 Be7 47. d5 a5 48. d6 Bd8
49. Rb3 Kf7 50. c5 bxc5 51. Bg3 Ke8 52. Rb7 Be4 53. d7 Kf7 54. Rb8
Be7 55. d8=Q Bxd8 56. Rxd8 c4 57. Rc8 Bd5 58. Bh2 Kg6 59. Rc5 Kf5
60. Rxa5 Bc6 61. Ra7 c3 62. Rc7 Bxa4 63. Rxc3 Kg6 64. Rg3 Kf7 65. f5
exf5 [/pgn]

[Gusev]

Hi Peter,

You are correct! Pondering is ON in this tournament. This is by design.

Dmitri

Bobcat - Texel 1-0, Protector and Octochess are playing Ruy Lopez right now.

It looks like pondering (permanent brain) was enabled in this game. From the pgn file:

Code: Select all

    move   expected  score/     thinking
           reply     depth      time
 1. e4     c7-c5     +0.27/29   211
    e5     Ng1-f3    -0.31/14   419
 2. Nf3    Nb8-c6    +0.28/31   208
    Nc6    Bf1-b5    -0.26/14   251
 3. Bb5    Nc6-d4    +0.32/31   135
    Nd4    Nf3xd4    -0.47/14   318
 4. Nxd4   e5xd4     +0.32/31   339
    exd4   O-O       -0.47/14     0
 5. O-O    Bf8-c5    +0.27/31   364
    c6     Bb5-c4    -0.47/14     1
 6. Bc4    a7-a5     +0.46/30   453
    Nf6    Rf1-e1    -0.23/15   171
 7. Re1    Bf8-c5    +0.55/32   425
    Bc5    e4-e5     -0.19/16     0
 8. b4     Bc5-b6    +0.68/32   173
    Bxb4   c2-c3     -0.72/13   318
 9. e5     Nf6-d5    +0.67/35   201
    Nd5    c2-c3     -0.48/14   299
10. c3     Bb4-e7    +0.68/35    31
    dxc3   Nb1xc3    -0.67/15   334
11. dxc3   Bb4-e7    +0.84/33   162
    Bc5    Qd1-g4    -0.40/14   285
12. Nd2    b7-b5     +1.04/32   209
    O-O    Nd2-e4    -0.81/12   341
13. Ne4    d7-d6     +1.23/29   203
    Qa5    Qd1-d3    -1.06/13   100
14. Bxd5   Bc5xf2+   +3.06/29   200
    cxd5   Ne4xc5    -0.12/13   250
15. Nf6+   Kg8-h8    +4.86/29   136
    Kh8    Bc1-g5    -1.96/13   318
16. Bh6    Rf8-g8    +5.34/34   308
    d6     Qd1-f3    -0.81/11   305
17. Qh5    Rf8-g8    +9.59/28   238
    Bxf2+  Kg1-h1    -3.42/11   240
18. Kh1    Rf8-g8   +10.92/28   139
    Rg8    Nf6xg8    -6.75/15   124
19. Nxg8   Bc8-e6   +11.29/29   199
    Qd8    Qh5xf7    -7.53/14   257
20. Qxf7   Qd8xg8   +11.76/29   127
    gxh6   Ng8-e7    -8.12/16    60
21. Qxf2   -        +16.65/30   275
    Be6    e5xd6   -317.77/25   679
22. exd6   Qd8xd6    +M180/31   152
    Qxd6   Ng8xh6   -18.31/19     0
23. Nxh6   Qd6-f8     +M43/30   251
    Kg7    Qf2-d4+  -16.90/15   157

Note that texel replied instantly at moves 4, 5, 7 and 22. There are only three cases in which texel will reply instantly:

1. If there is only one legal move.
2. If the best move leads to a mate in N and texel has searched at least 2*N plies.
3. If texel has been pondering, got a ponder hit, and has already pondered as long as it normally would have thought without a ponder hit.

Since case 1 and 2 are not applicable in this game, the logical conclusion is that pondering was enabled. It can also be seen that the correct response was predicted the move before each instant move and the opponent thinking time was long enough to satisfy case 3.

Also black's move 21 is the only time in this game where texel reached a reasonable search depth, and it is also the only time in the game where the opponent could not have been pondering, since it only produced a 1-ply PV on the previous move.

It seems pondering has something to do with why texel searched extremely slowly in this game.

[Gusev]

[pgn]
[Site " Purdue FOSCEC Season 4"]
[Date "06-06-2017"]
[White "Vajolet2 2.3 "]
[Black "Igorrit 0.086v8_x64 "]
[Result "0-1"]
[TimeControl "012030 "]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Bd2 O-O 5. e3 b6 6. Bd3 d5 7. cxd5
exd5 8. Rc1 c5 9. Nge2 Bxc3 10. Nxc3 Ba6 11. Bxa6 Nxa6 12. Ne2 c4
13. f3 Qd6 14. Qa4 b5 15. Qa5 Rfb8 16. O-O Rb6 17. g4 Nc7 18. a3 Qd7
19. Be1 h5 20. g5 Nfe8 21. Qd2 Nd6 22. Bg3 Ne6 23. Bxd6 Qxd6 24. h4
Re8 25. Kg2 Nf8 26. Rh1 Ng6 27. Rce1 b4 28. axb4 Qxb4 29. Nc3 Qxb2
30. Re2 Qxd2 31. Rxd2 Rxe3 32. Nxd5 Rd3 33. Rxd3 Rb2 34. Kg3 cxd3
35. Ne3 d2 36. Rd1 Rb3 37. Nf1 Rd3 38. Rxd2 Rxd2 39. Nxd2 a5 40. d5
Ne7 41. d6 Nf5 42. Kf4 Nxd6 43. Ke5 Nc8 44. Nc4 a4 45. Kd4 Kh7 46. Ke5
Kg6 47. Kf4 Nd6 48. Ne5 Kh7 49. Nd3 a3 50. Nc1 Kg6 51. Kg3 Nf5 52. Kh3[/pgn]

[Gusev]

The first defeat of Senpai at the hands of the fish!
[pgn]
[Site " Purdue FOSCEC Season 4"]
[Date "06-06-2017"]
[White "Cfish 190417 64 BMI2 NUMA "]
[Black "Senpai 1.0 "]
[Result "1-0"]
[TimeControl "012030 "]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 O-O 5. Bg5 Bxc3 6. bxc3 h6 7. Bh4
d6 8. e3 Re8 9. Bd3 e5 10. Nd2 Nbd7 11. O-O g5 12. Bg3 Qe7 13. Re1
e4 14. Bc2 Nb6 15. a4 Bg4 16. Qb1 Be6 17. c5 dxc5 18. Nxe4 Nxe4 19. Bxe4
c6 20. a5 Nc4 21. Qc2 Nd6 22. Bh7 Kh8 23. c4 f6 24. Bg6 Red8 25. dxc5
Nxc4 26. a6 b5 27. cxb6 axb6 28. Qe4 Qd7 29. h4 Bd5 30. Qc2 b5 31. hxg5
hxg5 32. Rad1 Qe7 33. e4 Bg8 34. Rxd8 Rxd8 35. Qe2 Kg7 36. Qh5 Ne5
37. Bf5 Qf7 38. Qh2 Qe7 39. f4 gxf4 40. Bxf4 Kf8 41. Be3 Qd6 42. Rc1
Nc4 43. Qxd6 Nxd6 44. Rd1 Kg7 45. a7 Bd5 46. Bb6 Ra8 47. exd5 c5[/pgn]

[Gusev]

Code: Select all

 RANK   ENGINE                                    GAMES  POINTS   1  2  3  4  5  6  7  8  9  10 11 12 13 14 15 16 17 18 19 20 
------------------------------------------------------------------------------------------------------------------------------
   1.   ASMFISHW_2017-04-09_BMI2                    24    21.0    ** == =. =. =. 11 1. 1. 1. 11 =. 1. 11 1. 1. 1. 11 1. 1. 1. 
   2.   MCBRAIN_2017_V21A_X64_BMI2                  24    19.5    == ** =. =1 1. 1. =. 1. =. 1= =. 1. 11 1. 1. 1. =. 1. 1. 11 
   3.   CFISH_2017-04-18_YC_X64_BMI2                24    18.0    =. =. ** =. =. 1= =. 1. 1. =. =1 1. 1. 11 1. 1. =1 =. 1= =. 
   4.   STOCKFISH_2017-04-17_X64_BMI2               24    17.5    =. =0 =. ** =. =. =. =. 1. =. =. 1. =1 1. 1. =1 1. 11 1. 11 
   5.   GULL.3.1_JVX64                              24    17.0    =. 0. =. =. ** == =. 0. 1. =. 11 =1 1. 1= 1. 1. 1. 1. =1 1. 
   6.   IVANHOE1945A_X64_AVX2_INTEL_2015-07-28      24    16.0    00 0. 0= =. == ** 1. 1. =. 1. 1. =. 1. =1 =. 1. 11 1. 1. 1. 
   7.   BOOOT6_POPCNT                               24    16.0    0. =. =. =. =. 0. ** 1. 11 1. 1. 1. 10 =. 1. 1= =. 0= 1. 11 
   8.   PROTECTOR_WIN64                             24    14.0    0. 0. 0. =. 1. 0. 0. ** =1 =. 1. =. =. 1. 1= 1= =. == 1. 11 
   9.   FIRENZINA_2-4-3_XTREME_X64_AVX2_INTEL_20    24    12.0    0. =. 0. 0. 0. =. 00 =0 ** =. =1 11 =. =. 0. =. 1. 1. 11 1. 
  10.   IGORRIT_0086V9_X64-SENTINEL                 24    10.5    00 0= =. =. =. 0. 0. =. =. ** =. 0. 01 1. =. 11 1. =. 0. 01 
  11.   SENPAI1.0_SSE42                             24    10.5    =. =. =0 =. 00 0. 0. 0. =0 =. ** =. 1. 0. == =. 1. =1 1. 1. 
  12.   CHENG4_X64                                  24    10.0    0. 0. 0. 0. =0 =. 0. =. 00 1. =. ** =. =. == 1= 1. 01 =. 1. 
  13.   CRAFTY-WIN64                                24     9.5    00 00 0. =0 0. 0. 01 =. =. 10 0. =. ** 1. =. =. =. 1. 1. 1. 
  14.   BOBCAT_V8.0_CORE2                           24     9.0    0. 0. 00 0. 0= =0 =. 0. =. 0. 1. =. 0. ** 10 =. 1= 1. =. 1. 
  15.   TEXEL64                                     24     8.5    0. 0. 0. 0. 0. =. 0. 0= 1. =. == == =. 01 ** 0. =. =. 0= 1. 
  16.   VAJOLET2.2.3                                24     8.5    0. 0. 0. =0 0. 0. 0= 0= =. 00 =. 0= =. =. 1. ** 1. 1. =. 1. 
  17.   OPENCRITTER64                               24     7.5    00 =. =0 0. 0. 00 =. =. 0. 0. 0. 0. =. 0= =. 0. ** 1. 11 1. 
  18.   ARASANX-64-POPCNT                           24     6.5    0. 0. =. 00 0. 0. 1= == 0. =. =0 10 0. 0. =. 0. 0. ** 0. 1. 
  19.   TOGA_II_3-0                                 24     6.0    0. 0. 0= 0. =0 0. 0. 0. 00 1. 0. =. 0. =. 1= =. 00 1. ** 0. 
  20.   OCTOCHESS-WINDOWS-SSE4-R5190                24     2.5    0. 00 =. 00 0. 0. 00 00 0. 10 0. 0. 0. 0. 0. 0. 0. 0. 1. ** 

[Gusev]

[pgn]
[Site " Purdue FOSCEC Season 4"]
[Date "06-06-2017"]
[White "Arasan 20.0 "]
[Black "Stockfish 180417 64 BMI2 "]
[Result "0-1"]
[TimeControl "012030 "]

1. e4 e6 2. d4 d5 3. Nd2 c5 4. exd5 Qxd5 5. Ngf3 cxd4 6. Bc4 Qd7
7. Nb3 Qc7 8. Bd3 Nf6 9. Nbxd4 a6 10. Qe2 Nbd7 11. O-O Bc5 12. a4
b6 13. a5 b5 14. c4 bxc4 15. Bxc4 O-O 16. Bg5 Bb7 17. Rfc1 Qd6 18. Rd1
Nd5 19. Bh4 Rfc8 20. Bg3 Qe7 21. Rac1 Bb4 22. Nb3 Qe8 23. Nfd2 N7f6
24. Ne4 Nxe4 25. Qxe4 Bf8 26. Qg4 Nf6 27. Qe2 Bd5 28. Rd4 Rc6 29. Bh4
Bxc4 30. Rdxc4 Rxc4 31. Qxc4 Rb8 32. Bxf6 gxf6 33. Qg4 Bg7 34. Nc5
f5 35. Qc4 Rxb2 36. Qxa6 Bd4 37. Qd6 Bxf2 38. Kf1 Bh4 39. Nd3 Ra2
40. a6 Qa8 41. Rc6 Kg7 42. Qd4 Bf6 43. Qd6 h5 44. Nf4 Ra1 45. Ke2
Qg8 46. Nd5 Kh6 47. Qf4 Bg5 48. Qe5 Ra2 49. Kf1 Rxg2 50. Nc3 Rg1
51. Ke2 Qa8 52. Qc7 Ra1 53. Qb6 Kg6 54. Kd3 Bf6 55. Ne2 Qf8 56. Nc3
Qa3 57. h3 Rd1 58. Ke2 Rh1 59. Qe3[/pgn]

[Gusev]

[pgn]
[Site " Purdue FOSCEC Season 4"]
[Date "06-06-2017"]
[White "Gull.3.1_JVx64 "]
[Black "Cheng 4.39 "]
[Result "1-0"]
[TimeControl "012030 "]

1. e4 c5 2. c3 Nc6 3. d4 d5 4. exd5 Qxd5 5. Nf3 Bf5 6. Be2 cxd4 7. cxd4
Bxb1 8. Rxb1 e6 9. O-O Bd6 10. b4 Nf6 11. b5 Ne7 12. Ne5 Qxa2 13. Rb3
Bxe5 14. dxe5 Rd8 15. Bd3 Nd7 16. Ba3 b6 17. Bb1 Qa1 18. Rd3 Qxe5
19. Qd2 Qxb5 20. Ba2 a5 21. Rd1 Ng6 22. Rc3 h6 23. Qd6 Qg5 24. Rc8
Ngf8 25. Rxd8 Qxd8 26. Bc4 Ng6 27. Bb5 Ne7 28. Bxd7 Kf8 29. Bb5 Qxd6
30. Rxd6 Kg8 31. Rd8 Kh7 32. Rxh8 Kxh8 33. Bxe7 Kh7 34. Bd8 e5 35. Bxb6
a4 36. Bxa4 Kg8 37. Kf1 f6[/pgn]

[Gusev]

[pgn]
[Site " Purdue FOSCEC Season 4"]
[Date "06-07-2017"]
[White "Firenzina 2.4.3 xTreme x64 "]
[Black "Booot 6.1_x64_popcnt "]
[Result "0-1"]
[TimeControl "012030 "]

1. d4 Nf6 2. c4 e6 3. Nf3 Bb4 4. Bd2 Bxd2 5. Qxd2 b6 6. Nc3 Bb7 7. e3
O-O 8. Be2 Ne4 9. Nxe4 Bxe4 10. O-O d6 11. Qc3 Nd7 12. Nd2 Bb7 13. Rad1
Qe7 14. Bf3 Bxf3 15. Nxf3 e5 16. dxe5 dxe5 17. Rd5 f6 18. b4 c6 19. Rd2
a5 20. bxa5 Rxa5 21. Qb3 Rb8 22. c5 Kh8 23. cxb6 Nxb6 24. Rc1 Rb5
25. Qc2 c5 26. Nh4 c4 27. Nf5 Qc7 28. Nd6 Rc5 29. h3 c3 30. Rdd1 Nd5
31. Ne4 Nb4 32. Nxc5 Nxc2 33. Na6 Nxe3 34. fxe3 Qa7 35. Nxb8 Qxb8
36. a4 Qa8 37. Rxc3 h5 38. Rc4 Qa7 39. Kf2 Kh7 40. Rd5 Qf7 41. Rdc5
Qd7 42. Ke2 Qb7 43. Kf2 Qd7 44. Re4 Qd2 45. Kf3 Qd1 46. Kf2 Qd2 47. Kf3
Qe1 48. h4 Kh6 49. Rc6 Kg6 50. Rec4 Kf5 51. e4 Kg6 52. R6c5 Qxh4
53. a5 Qf4 54. Ke2 Qh2 55. Kf1 Qh1 56. Kf2 Qa1 57. Kg3 Qg1 58. Kh3
Qh1 59. Kg3 h4 60. Kf2 Qa1 61. Rc3 Kh5 62. Rc1 Qd4 63. Kf1 Qxe4 64. Kg1
Qe3 65. Kh1 h3 66. R5c3 hxg2 67. Kxg2 Qd2 68. Kf1 e4 69. R3c2 Qd3
70. Ke1 Qg3 71. Ke2 Qf3 72. Ke1 f5 73. Rh2 Kg4 74. Rcc2 Qe3 75. Kf1
Qd3 76. Rhe2 f4 77. Rcd2[/pgn]