Unusual imbalance

[Nordlandia]

Peter i think it is a equilibrium. The Rc8 position.

Unless that is wrong of course.

[Spliffjiffer]

Latest Lc0 with 68500 net defeated Dragon.

Parameter MaxOutOfOrderEvalFactor = 2.0

[d]Qb1k4/nP1n1p2/6p1/7p/7P/4K3/8/8 w - - 0 100

[pgn][Event "i7-5960X 4.5GHz / 2x 2080 Supe"]
[Site "i7-5960X 4.5GHz / 2x 2080 Supe"]
[Date "2021.04.15"]
[Round "?"]
[White "dragon-64bit-avx2"]
[Black "Latest Lc0"]
[Result "0-1"]
[SetUp "1"]
[FEN "2r1k3/1b1nbpp1/p2ppn2/1p5p/4P3/P4PP1/1PP1Q2P/1K1R2R1 w - - 0 20"]
[PlyCount "171"]
[EventDate "2021.??.??"]
[TimeControl "1800+30"]

20. Qe3 {0.62/32 108.3s} e5 {0.01/14 146.0s} 21. Rg2 {0.84/31 106.8s} Nc5 {
0.05/19 95.12s} 22. h3 {0.78/32 122.9s} Nfd7 {0.01/17 95.52s} 23. h4 {0.72/34
187.1s} Nf6 {0.02/16 77.24s} 24. Qe1 {0.63/34 121.3s} Rc6 {0.00/15 82.65s} 25.
Re2 {0.68/33 79.01s} Rb6 {0.00/15 81.32s} 26. Qa5 {0.85/35 315.7s} Bd8 {
0.05/14 83.92s} 27. Qc3 {0.74/31 68.61s} Bc7 {0.04/15 215.0s} 28. Re3 {0.51/34
93.86s} Ne6 {0.03/16 0.24s} 29. Qd2 {0.40/35 261.4s} Ke7 {0.00/13 138.1s} 30.
Kc1 {0.49/35 199.9s} Bc6 {0.00/12 188.0s} 31. Rd3 {0.49/34 80.02s} Bb7 {
0.01/10 84.68s} 32. Rc3 {0.45/36 55.99s} Bc6 {0.00/13 113.3s} 33. Qf2 {0.46/35
94.05s} a5 {0.00/13 49.18s} 34. Kb1 {0.50/35 56.81s} a4 {0.00/12 33.76s} 35. b3
{0.01/36 122.1s} axb3 {0.11/19 47.53s} 36. cxb3 {0.00/39 38.69s} Bd8 {0.11/21
7.24s} 37. Qd2 {0.00/40 26.12s} Bd7 {0.07/20 56.09s} 38. Rd3 {0.00/42 21.25s}
Bc7 {0.06/22 21.92s} 39. b4 {0.00/45 32.32s} Rc6 {0.16/15 135.9s} 40. Ka2 {
0.00/45 23.11s} g6 {0.15/15 158.1s} 41. Rc3 {0.00/43 22.73s} Rxc3 {0.23/14 55.
55s} 42. Qxc3 {0.00/41 22.01s} Bb6 {0.23/16 2.65s} 43. Kb1 {0.00/43 22.33s} Bf2
{0.16/16 161.0s} 44. Qd2 {0.00/45 49.35s} Bd4 {0.16/11 0.20s} 45. Qe1 {0.00/48
22.89s} Kf8 {0.20/15 102.1s} 46. Rd3 {0.00/44 24.54s} Ke8 {0.20/13 40.58s} 47.
Kc1 {0.00/43 29.01s} Bc6 {0.15/14 82.67s} 48. Kd2 {0.00/37 54.85s} d5 {0.21/15
55.29s} 49. Qc1 {0.00/42 24.99s} Kd7 {0.18/23 9.88s} 50. exd5 {0.00/45 23.86s}
Bxd5 {0.18/21 3.72s} 51. Ke1 {0.00/46 22.39s} Ne8 {0.15/22 95.54s} 52. Qd1 {
0.00/40 26.54s} Bc4 {0.31/18 27.59s} 53. a4 {0.00/44 30.02s} Bxd3 {0.30/18 7.
59s} 54. Qxd3 {0.00/45 24.63s} bxa4 {0.30/17 5.84s} 55. Qb5+ {0.00/48 26.87s}
Ke7 {0.28/15 85.94s} 56. Qxa4 {0.00/51 31.45s} Nf6 {0.29/13 0.24s} 57. Kf1 {
0.00/53 27.19s} Nf8 {0.30/11 60.39s} 58. Qc6 {0.00/48 33.08s} Ne8 {0.31/12 69.
74s} 59. b5 {0.00/51 27.96s} Nd7 {0.30/12 23.48s} 60. f4 {0.00/49 28.79s} Nd6 {
0.43/16 29.84s} 61. fxe5 {0.00/55 36.66s} Bxe5 {0.39/16 24.75s} 62. b6 {
0.00/56 28.35s} Nf5 {0.37/15 32.54s} 63. Kg2 {0.00/47 28.78s} Bxg3 {0.45/16 29.
44s} 64. Kh3 {0.00/54 28.34s} Bb8 {0.45/16 14.08s} 65. Qe4+ {0.00/52 34.12s}
Kd8 {0.42/17 29.15s} 66. Qd5 {0.00/59 29.09s} Nd6 {0.58/19 31.85s} 67. Qa5 {
0.00/57 32.16s} Nc4 {0.95/17 31.30s} 68. Qd5 {0.00/57 84.04s} Nce5 {0.95/15 0.
41s} 69. Qa8 {-0.16/54 199.3s} Ke7 {1.10/16 29.76s} 70. Qa3+ {-0.18/42 18.92s}
Bd6 {1.16/17 25.67s} 71. Qa6 {-0.18/44 18.18s} Bc5 {1.23/15 35.35s} 72. b7 {
-0.19/42 24.19s} Nb8 {1.24/14 58.04s} 73. Qb5 {-0.19/42 22.20s} Bd6 {1.22/15
28.81s} 74. Kg3 {-0.20/40 20.95s} Nec6+ {1.23/16 56.22s} 75. Kf2 {-0.21/42 19.
24s} Nd8 {1.29/15 10.65s} 76. Ke2 {-0.20/40 23.13s} Nbc6 {1.20/15 29.74s} 77.
Kd1 {-0.26/41 55.58s} Kd7 {1.29/14 32.88s} 78. Qb6 {-0.29/38 23.03s} Bg3 {
1.25/14 47.15s} 79. Qe3 {-0.29/39 41.34s} Bb8 {1.19/14 62.42s} 80. Qb6 {
-0.21/38 18.65s} Bd6 {1.20/13 11.75s} 81. Ke1 {-0.38/38 32.00s} Bc7 {1.00/15
184.6s} 82. Qb2 {0.00/45 24.63s} Bf4 {1.00/1 0.007s} 83. Qb6 {0.00/47 21.14s}
Bg3+ {1.01/13 25.73s} 84. Kd1 {0.00/49 22.68s} Bc7 {1.10/13 21.80s} 85. Qb1 {
0.00/50 53.54s} Ne6 {1.12/13 27.26s} 86. Qa2 {-0.11/46 57.03s} Ned8 {1.05/14
21.24s} 87. Qb2 {0.00/46 18.38s} Bg3 {0.98/14 49.60s} 88. Qb3 {0.00/51 19.99s}
Bf4 {0.97/13 26.63s} 89. Qb6 {-0.07/52 70.57s} Be5 {0.94/13 22.74s} 90. Qb5 {
0.00/53 18.88s} Bd6 {0.95/13 27.21s} 91. Qb6 {-0.30/42 26.54s} Nb8 {1.02/15 10.
68s} 92. Qb5+ {-0.35/39 45.63s} Ndc6 {1.13/17 10.44s} 93. Qc4 {-0.38/40 30.63s}
Ne5 {1.20/17 8.17s} 94. Qc8+ {-0.40/39 20.92s} Ke7 {1.18/1 0.006s} 95. Ke2 {
-0.40/41 24.43s} Nbc6 {1.27/16 12.98s} 96. Qa8 {-0.40/40 21.91s} Bb8 {1.20/14
25.56s} 97. Ke3 {-0.29/37 51.85s} Kd8 {1.16/15 30.71s} 98. Kf4 {-0.41/38 30.87s
} Nd7+ {3.13/16 24.31s} 99. Ke3 {-2.72/36 30.04s} Na7 {5.16/13 23.31s} 100. Ke4
{-2.95/37 24.66s} f6 {7.32/15 25.63s} 101. Kf3 {-250.00/28 4.50s} g5 {8.90/15
19.42s} 102. hxg5 {-250.00/44 4.11s} fxg5 {9.20/16 23.10s} 103. Ke4 {-250.00/
43 11.78s} h4 {12.29/16 53.94s} 104. Ke3 {-250.00/42 3.91s} g4 {13.01/17 15.66s
} 105. Ke2 {adjudication -250.00/42 7.66s, Black wins by adjudication} 0-1[/pgn]

Because Dragon blundered deadly at 98.Kf4?? and so did let it's Queen be trapped, almost each and every other move (getting the Queen out of the corner or at least doesn't go with the King into the withdrawal- chess of the Knight) would have saved the draw.

its a very rare case but in this assessment i have a completely different opinion about the position after 97...Kd8:
2 variations that might illustrate my doubts:

of course 98. Kf4?? is a huge blunder that i would say only engines can make although i must admit that the refutation is not trivial to me...so:

Code: Select all

98. Qa6 Ng4+ 99. Kf3 Kc7 100. Kg3 Ba7 101. Qc4 Ne5 102. Qb5 Nd7 103. Kh3
Bb6 104. Qc4 Kxb7 105. Qxf7 Ne5 106. Qe6 Kc7 107. Qe8 Bf2 108. Qa8 Bc5 109.
Qd5 Kd8 110. Qe6 Bg1 111. Kg3 Ba7 112. Qg8+ Ke7 113. Qh7+ Kf6 114. Qh8+ Kf5
115. Qc8 Bc5 116. Qd8 Bd6 117. Qa5 Kf6 118. Qd8+ Kf7 119. Kh3 Be7 120. Qc7
Kf6 121. Qc1 Nc5 122. Qf4+ Ke6 123. Qe3 Bd6 124. Kg2 Kd7 125. Qh6 Ne6 126.
Qh7+ Ke8 127. Qg8+ Ke7 128. Kf2 Kf6 129. Qh8+ Kf7 130. Qc8 Ng4+ 131. Kf3
Be7 -+

and:

Code: Select all

98. Qa6 Kc7 99. Kf4 Nd7 100. Kg5 Ba7 101. Kh6 Nde5 102. Kg5 Bf2 103. Qb5
Ng4 104. Kf4 Be3+ 105. Kg3 Bb6 106. Qa6 Nge5 107. Kf4 Bc5 108. Kg5 Ng4 109.
Kf4 Bd6+ 110. Kf3 Nf6 111. b8=Q+ Nxb8 112. Qa7+ Kc6 113. Qxf7 Nbd7 114.
Qc4+ Nc5 115. Qf7 Ng4 116. Qg8 Kc7 117. Qg7+ Kb6 118. Qa1 Kc6 119. Qa2 Kc7
120. Qf7+ Nd7 121. Qe8 Nge5+ 122. Kf4 Bb4 123. Qe6 Bd2+ 124. Kg3 Be1+ 125.
Kh3 Bf2 126. Qg8 Kd6 127. Qe8 Be1 128. Qh8 Bb4 129. Qg8 Ke7 130. Qg7+ Ke6
131. Qg8+ Kf5 132. Qb3 Bd6 133. Kg2 Kf6 134. Qc3 Bf8 135. Qc8 Kf7 136. Qc7
Bc5 137. Kh3 Ke6 138. Kg2 Be7 139. Kh3 Bd6 140. Qc8 Ke7 141. Qb7 Kf6 142.
Qd5 Nf7 143. Kg2 Nde5 144. Kh3 Kg7 145. Qe4 Be7 146. Qe1 Bf6 147. Qc3 Nd6
148. Qc7+ Nef7 149. Qc1 Nf5 -+

the main problem for white is his pawn hanging on a square that the black bishop can attack...if black manages to get out of checks by simultanesly getting closer to this pawn (Nf5) its practically over...its far from trivial for me but im convinced that black can achieve this by force !?

so my assessment after 97...Kd8 is not dead remis hehe ...but white is dead lost already imo
happy analysing, grüss dich Peter

[peter]

so my assessment after 97...Kd8 is not dead remis hehe ...but white is dead lost already imo

You're right, I didn't look close enough at position after 98th, even when avoiding the worst blunder Kf4? costing the game at once, there's not much hope for White from there onward anyhow, except re- blunder of Black's to get over 50 moves boundary yet still.

So there are only 78 more moves left to look for other blunders of White's at Backward.
Or we just go back to postion after 19.Rge1 instead of Qd2 regards