Surpising endgame pecularities - Bit-Genie + Zahak

[Guenther]

From a little ultrafast test tourney with 10s +0.2s (64MB, 6ply start pgn, Syzygy 5men for Zahak).

In game 1 Bit-Genie 9.19 could not win with R+N vs. lone King?
Also surprising that the eval went down to 0 at very high depths already
8 moves before the repetition and long before the 50 moves rule?
Thus it seems search time at this tc is not the problem.

Usually Bit-Genie despite not being capable of using tablebases finishes games quite fast.
It looks as if the additional Knight somehow creates a problem in mating.

[pgn][Event "ZahakDev"]
[Site "RWBC-CAPPUCCINO Win7U64 Q8200 2.33Ghz"]
[Date "2022.02.11"]
[Round "7.2.4"]
[White "Zahak_90GS-64"]
[Black "Bit-Genie_919-64"]
[Result "1/2-1/2"]
[ECO "D20"]
[GameDuration "00:00:42"]
[GameEndTime "2022-02-11T11:43:38.475 Mitteleuropäische Zeit"]
[GameStartTime "2022-02-11T11:42:55.546 Mitteleuropäische Zeit"]
[Opening "Queen's Gambit accepted"]
[PlyCount "168"]
[TimeControl "10+0.2"]
[Variation "3.e4"]

1. d4 {book} d5 {book}
2. c4 {book} dxc4 {book}
3. e4 {book} b5 {book}
4. a4 {+0.49/11 0.38} c6 {-0.73/17 0.66}
5. axb5 {+0.46/12 1.08} cxb5 {-0.81/18 0.64}
6. Nf3 {+0.49/10 0.41} e6 {-0.92/15 0.62}
7. b3 {+0.61/10 0.47} Nf6 {-0.20/16 0.60}
8. bxc4 {+0.55/11 0.62} Nxe4 {-0.19/15 0.58}
9. c5 {+0.56/10 0.34} Bxc5 {+0.21/16 0.56}
10. Bxb5+ {+0.05/10 0.78} Bd7 {+0.42/18 0.54}
11. Bxd7+ {+0.28/11 1.17} Qxd7 {+0.14/20 0.52}
12. O-O {-0.13/11 0.35} Bd6 {+0.58/19 0.51}
13. Qe2 {-0.20/11 0.34} Qb7 {+0.61/17 0.49}
14. Nbd2 {-0.25/10 0.34} Nxd2 {+0.52/18 0.47}
15. Bxd2 {-0.41/11 0.29} O-O {+0.38/19 0.46}
16. Rfb1 {-0.42/11 0.47} Qd7 {+0.55/19 0.45}
17. Ng5 {-0.03/10 0.33} Be7 {+0.76/18 0.44}
18. Nxh7 {-0.32/10 0.40} Rc8 {+1.03/18 0.42}
19. Bg5 {-0.39/11 0.37} Nc6 {+1.38/16 0.41}
20. Bxe7 {-0.67/10 0.27} Qxe7 {+1.03/18 0.40}
21. Qh5 {-0.72/10 0.34} f6 {+1.80/14 0.39}
22. Qh4 {-0.69/9 0.27} a5 {+2.11/14 0.38}
23. Rb3 {-0.80/10 0.29} Nb4 {+2.37/15 0.37}
24. h3 {-0.73/10 0.34} Nd5 {+2.80/16 0.36}
25. Kh2 {-1.58/10 0.59} g6 {+4.22/18 0.36}
26. Nxf6+ {-2.71/9 0.24} Qxf6 {+4.12/20 0.35}
27. Qxf6 {-3.00/11 0.36} Nxf6 {+3.87/20 0.34}
28. Rba3 {-2.93/12 0.58} Rc2 {+3.88/20 0.34}
29. Kg1 {-2.85/11 0.19} Nd5 {+4.03/20 0.33}
30. Rxa5 {-2.84/12 0.43} Rf8 {+4.03/18 0.32}
31. Rf1 {-2.74/10 0.31} Nc3 {+4.22/15 0.32}
32. h4 {-2.49/10 0.27} Ne2+ {+4.23/15 0.31}
33. Kh2 {-2.58/10 0.50} Nxd4 {+4.21/16 0.30}
34. h5 {-2.81/11 0.54} Rfxf2 {+4.94/17 0.30}
35. Rxf2 {-2.76/11 0.34} Rxf2 {+5.12/18 0.29}
36. hxg6 {-2.76/11 0.22} Kg7 {+5.19/18 0.29}
37. Ra4 {-2.72/11 0.41} Rf4 {+5.58/16 0.28}
38. Ra5 {-2.93/10 0.23} Kxg6 {+5.71/16 0.28}
39. Kg3 {-3.00/10 0.26} Ne2+ {+5.71/16 0.28}
40. Kh3 {-3.14/10 0.21} Kf6 {+5.77/16 0.27}
41. g4 {-2.93/10 0.15} Nc3 {+5.77/14 0.27}
42. Rh5 {-3.06/9 0.25} Ne4 {+6.25/16 0.27}
43. Rb5 {-3.09/10 0.18} Rf3+ {+7.19/17 0.26}
44. Kh4 {-3.34/9 0.33} Nf2 {+10.79/25 0.26}
45. g5+ {-6.01/10 0.19} Kg6 {+10.79/25 0.26}
46. Rb3 {-269.87/16 0.26} Rd3 {+10.96/24 0.25}
47. Ra3 {-269.85/16 0.36} Kf5 {+11.59/20 0.25}
48. Ra5+ {-269.83/15 0.49} e5 {+17.73/21 0.25}
49. Rxe5+ {-269.83/14 0.17} Kxe5 {+M29/18 0.24}
50. Kh5 Kf5 {+15.52/20 0.24}
51. Kh6 Rh3+ {+M33/22 0.24}
52. Kg7 Ke6 {+M25/20 0.24}
53. Kg6 Ne4 {+M45/21 0.24}
54. Kg7 Nxg5 {+319.35/20 0.24}
55. Kf8 Ne4 {+M29/19 0.23}
56. Kg7 Nf6 {+M29/20 0.23}
57. Kg6 Rg3+ {+M31/19 0.23}
58. Kh6 Ra3 {+15.52/19 0.23}
59. Kg5 Ra4 {+319.35/21 0.23}
60. Kg6 Rg4+ {+319.33/21 0.23}
61. Kh6 Rc4 {+319.29/19 0.23}
62. Kg5 Ke5 {+319.29/19 0.22}
63. Kh6 Rf4 {+319.25/20 0.22}
64. Kg5 Rd4 {+319.27/19 0.22}
65. Kh6 Rh4+ {+M63/20 0.22}
66. Kg7 Kf5 {+319.31/21 0.22}
67. Kf7 Rh3 {+319.35/17 0.22}
68. Ke7 Ne4 {+319.31/18 0.22}
69. Kd7 Ke5 {+319.23/17 0.22}
70. Kc6 Rh6+ {+319.23/16 0.22}
71. Kb5 Kd4 {+319.31/18 0.21}
72. Kb4 Rh3 {+319.31/18 0.21}
73. Kb5 Rc3 {+319.23/19 0.21}
74. Ka5 Kd5 {+319.31/21 0.21}
75. Kb5 Rb3+ {+15.26/23 0.21}
76. Ka4 Rh3 {+9.72/21 0.21}
77. Kb5 Rh6 {0.00/46 0.21}
78. Kb4 Rb6+ {0.00/64 0.10}
79. Ka5 Kc5 {0.00/64 0.094}
80. Ka4 Kd4 {0.00/64 0.094}
81. Ka5 Rb2 {0.00/64 0.13}
82. Ka4 Rb6 {0.00/64 0.091}
83. Ka5 Rb2 {0.00/64 0.13}
84. Ka4 Rb6 {0.00/64 0.094}
{Draw by 3-fold repetition}
1/2-1/2[/pgn]

[fen]8/8/7r/1K1k4/4n3/8/8/8 w - - 46 78[/fen]
(first move with sudden zero eval, instead of mate eval)

In the second game, which was limited due to my setting with max moves 200, I have no doubt that
Zahak would have won sooner or later, but the postponing of pawn moves probably until 50 moves
draw has to be avoided, looks very similar to what LC0 had done for a long time.
May be Zahak could be persuaded to move the pawns earlier when material diff is very big!?
(I haven't checked, if HCE is still used at some point, or available anymore at all)
Ofc it is also possible search time is too low at that tc to make quicker/better progress.

[pgn][Event "ZahakDev"]
[Site "RWBC-CAPPUCCINO Win7U64 Q8200 2.33Ghz"]
[Date "2022.02.11"]
[Round "7.3.2"]
[White "Zahak_90GS-64"]
[Black "Zahak_10devGS-64"]
[Result "1/2-1/2"]
[ECO "A45"]
[GameDuration "00:01:40"]
[GameEndTime "2022-02-11T11:46:08.442 Mitteleuropäische Zeit"]
[GameStartTime "2022-02-11T11:44:28.250 Mitteleuropäische Zeit"]
[Opening "Trompowsky attack (Ruth, Opovcensky Opening)"]
[PlyCount "400"]
[Termination "adjudication"]
[TimeControl "10+0.2"]

1. d4 {book} Nf6 {book}
2. Bg5 {book} c5 {book}
3. Bxf6 {book} exf6 {book}
4. Nc3 {+0.16/11 0.39} d5 {-0.19/14 2.17}
5. e3 {+0.09/12 0.49} Nc6 {-0.06/14 0.81}
6. Nge2 {+0.08/12 0.50} cxd4 {-0.06/13 0.36}
7. Nxd4 {+0.01/12 0.37} Bb4 {-0.15/14 1.03}
8. Qd2 {+0.15/12 0.46} O-O {-0.11/12 0.66}
9. a3 {+0.16/12 0.63} Ba5 {-0.07/12 0.45}
10. Be2 {+0.01/12 0.78} Be6 {-0.18/11 0.33}
11. O-O {0.00/11 0.55} Rc8 {-0.10/11 0.32}
12. Nf3 {-0.02/12 0.98} a6 {+0.31/9 0.25}
13. b4 {-0.12/10 0.36} Bb6 {+0.08/11 0.31}
14. Rfd1 {-0.12/10 0.39} Ne7 {+0.10/10 0.24}
15. Bd3 {+0.01/10 0.33} Re8 {+0.03/11 0.38}
16. h3 {-0.02/10 0.43} h6 {0.00/10 0.27}
17. Ne2 {+0.19/11 0.40} Ba7 {-0.18/10 0.28}
18. c3 {+0.13/12 0.47} Bb8 {-0.13/11 0.45}
19. a4 {+0.03/12 0.66} Qc7 {-0.12/11 0.33}
20. Qb2 {0.00/12 0.93} Nc6 {+0.15/10 0.23}
21. Nf4 {-0.04/10 0.34} Ne5 {+0.38/11 0.28}
22. Nxe5 {-0.34/10 0.28} Qxe5 {+0.67/11 0.27}
23. b5 {-0.54/10 0.40} Rxc3 {+0.63/11 0.33}
24. g3 {-0.99/9 0.37} a5 {+1.06/10 0.26}
25. b6 {-0.77/10 0.24} Rec8 {+0.88/10 0.42}
26. h4 {-0.95/10 0.42} R3c6 {+1.13/9 0.27}
27. Qb1 {-0.96/9 0.38} Bd6 {+1.34/10 0.36}
28. Be2 {-1.25/8 0.23} Bc5 {+1.59/10 0.40}
29. Qb5 {-1.22/9 0.39} g5 {+1.60/10 0.29}
30. Nxe6 {-1.56/9 0.28} fxe6 {+1.91/10 0.23}
31. hxg5 {-1.67/10 0.33} hxg5 {+1.38/10 0.29}
32. Qxa5 {-1.43/10 0.19} Bxe3 {+1.80/11 0.32}
33. fxe3 {-1.64/10 0.25} Qxg3+ {+2.39/12 0.44}
34. Kf1 {-1.42/9 0.19} Qh3+ {+2.20/10 0.21}
35. Kf2 {-1.32/10 0.28} Rc3 {+2.23/10 0.21}
36. Qb5 {-1.05/9 0.27} Qxe3+ {+4.74/11 0.31}
37. Kf1 {-2.66/10 0.24} Qf4+ {+5.08/12 0.41}
38. Ke1 {-3.83/9 0.22} Rh3 {+5.98/12 0.73}
39. Rdb1 {-2.51/9 0.28} Qg3+ {+8.30/12 0.36}
40. Kd1 {-7.63/10 0.28} Rh1+ {+9.04/12 0.23}
41. Bf1 {-8.75/10 0.28} Qf2 {+9.08/12 0.16}
42. Rc1 {-8.64/11 0.23} Rxf1+ {+9.17/11 0.23}
43. Qxf1 {-8.64/1 0.001} Qxf1+ {+9.25/11 0.23}
44. Kd2 {-8.64/1 0.001} Qf4+ {+9.30/10 0.16}
45. Kd1 {-8.96/8 0.22} Rxc1+ {+9.41/12 0.25}
46. Rxc1 {-8.99/11 0.28} Qxa4+ {+9.44/12 0.27}
47. Ke2 {-9.06/11 0.22} Qe4+ {+9.46/13 0.20}
48. Kd2 {-9.05/10 0.18} Qd4+ {+9.49/13 0.53}
49. Ke1 {-9.07/10 0.22} Qe3+ {+9.50/12 0.29}
50. Kd1 {-9.07/11 0.27} Qxb6 {+9.50/12 0.40}
51. Rc3 {-9.10/11 0.32} Kf7 {+9.50/11 0.35}
52. Rc8 {-9.08/10 0.23} Qd4+ {+9.50/10 0.41}
53. Kc2 {-9.10/9 0.32} Qe4+ {+9.53/9 0.17}
54. Kc3 {-9.14/9 0.28} Kg6 {+9.52/9 0.20}
55. Rc5 {-9.27/10 0.61} g4 {+9.65/10 0.25}
56. Rc8 {-9.25/9 0.17} d4+ {+9.67/8 0.18}
57. Kb4 {-9.18/9 0.21} e5 {+9.56/8 0.17}
58. Rg8+ {-9.10/10 0.23} Kf5 {+9.42/10 0.26}
59. Rh8 {-9.33/10 0.51} Kf4 {+9.71/9 0.21}
60. Rh6 {-9.31/9 0.15} Qc6 {+9.75/9 0.28}
61. Rh5 {-9.33/10 0.19} f5 {+9.74/9 0.15}
62. Rh2 {-9.32/11 0.21} Kg5 {+9.79/9 0.19}
63. Ka5 {-9.33/10 0.17} Qc5+ {+9.79/10 0.14}
64. Ka4 {-9.33/1 0.001} Qc6+ {+9.78/10 0.33}
65. Ka5 {-9.34/10 0.15} Qc5+ {+9.76/10 0.21}
66. Ka4 {-9.38/1 0.001} Qc4+ {+9.71/10 0.19}
67. Ka5 {-9.35/12 0.43} Qa6+ {+9.72/10 0.20}
68. Kb4 {-9.36/1 0.001} Qb6+ {+9.74/11 0.19}
69. Ka4 {-9.34/9 0.19} Kf4 {+9.77/10 0.17}
70. Ka3 {-9.36/11 0.24} Qa5+ {+9.77/10 0.18}
71. Kb3 {-9.37/10 0.42} Qb5+ {+9.78/11 0.18}
72. Ka3 {-9.36/10 0.17} Kg5 {+9.77/12 0.54}
73. Rh8 {-9.35/11 0.24} Qa5+ {+9.77/11 0.17}
74. Kb3 {-9.35/11 0.23} Qc3+ {+9.76/11 0.20}
75. Ka4 {-9.35/11 0.16} Qc4+ {+9.77/11 0.18}
76. Ka5 {-9.36/12 0.52} Qc5+ {+9.74/9 0.13}
77. Ka4 {-9.46/1 0.001} Qc6+ {+9.75/10 0.14}
78. Ka3 {-9.36/11 0.25} Qc4 {+9.77/11 0.13}
79. Rh2 {-9.36/12 0.57} Qb5 {+9.77/12 0.27}
80. Rh8 {-9.36/12 0.15} Qc4 {+9.77/12 0.14}
81. Rh2 {-9.33/11 0.25} Qa6+ {+9.75/10 0.14}
82. Kb4 {-9.35/11 0.17} Qd6+ {+9.77/11 0.21}
83. Kb3 {-9.32/10 0.14} Qd5+ {+9.75/10 0.19}
84. Kb4 {-9.34/10 0.15} Qd7 {+9.77/11 0.13}
85. Kc5 {-9.34/11 0.20} Qc6+ {+9.77/11 0.16}
86. Kb4 {-9.41/1 0.001} Qa6 {+9.77/13 0.38}
87. Rh8 {-9.35/11 0.15} Qc6 {+9.76/10 0.15}
88. Rh2 {-9.34/11 0.16} Qc7 {+9.74/11 0.23}
89. Kb5 {-9.32/10 0.15} Qd6 {+9.71/12 0.18}
90. Kc4 {-9.33/12 0.22} Kf4 {+9.74/11 0.24}
91. Rf2+ {-9.34/11 0.29} Kg5 {+9.75/9 0.16}
92. Rh2 {-9.32/13 0.34} Qe6+ {+9.72/10 0.19}
93. Kb4 {-9.35/11 0.32} Qd5 {+9.75/11 0.22}
94. Rh8 {-9.37/11 0.22} Qd6+ {+9.74/11 0.22}
95. Kc4 {-9.36/11 0.22} Qc6+ {+9.76/11 0.17}
96. Kb4 {-9.36/11 0.24} Qd6+ {+9.78/10 0.18}
97. Kb5 {-9.36/12 0.25} Qa6+ {+9.76/11 0.14}
98. Kc5 {-9.36/11 0.15} Qc6+ {+9.75/11 0.18}
99. Kb4 {-9.43/1 0.001} Qd5 {+9.73/10 0.22}
100. Rh2 {-9.37/11 0.24} b6 {+9.76/11 0.15}
101. Ka4 {-9.36/11 0.23} Qc4+ {+9.80/10 0.16}
102. Ka3 {-9.41/1 0.001} Qf1 {+9.75/10 0.16}
103. Rh8 {-9.38/9 0.17} Kf4 {+9.77/10 0.21}
104. Kb4 {-9.40/10 0.21} Qa6 {+9.77/10 0.17}
105. Rh2 {-9.38/10 0.17} Qa5+ {+9.77/11 0.18}
106. Kc4 {-9.37/10 0.15} Qc5+ {+9.72/10 0.16}
107. Kb3 {-9.37/11 0.32} Qc3+ {+9.77/11 0.22}
108. Ka4 {-9.40/11 0.20} Qc4+ {+9.77/11 0.24}
109. Ka3 {-9.40/1 0.001} Kg5 {+9.78/13 0.46}
110. Rh8 {-9.36/11 0.20} Qc3+ {+9.78/12 0.20}
111. Ka4 {-9.39/11 0.19} Qc4+ {+9.78/12 0.25}
112. Ka3 {-9.39/1 0.001} Qc3+ {+9.78/13 0.23}
113. Ka4 {-9.40/12 0.22} Qc6+ {+9.78/12 0.17}
114. Kb3 {-9.36/10 0.25} Qb5+ {+9.78/12 0.22}
115. Ka3 {-9.37/11 0.21} Qc4 {+9.78/14 0.40}
116. Rh1 {-9.36/10 0.19} Qc3+ {+9.79/11 0.15}
117. Ka2 {-9.37/12 0.72} Qa5+ {+9.80/11 0.15}
118. Kb2 {-9.36/12 0.58} Qc3+ {+9.78/12 0.18}
119. Ka2 {-9.36/12 0.15} Qf3 {+9.82/12 0.16}
120. Ra1 {-9.38/12 1.06} Qe3 {+9.82/10 0.16}
121. Kb2 {-9.39/12 0.13} Qc3+ {+9.83/10 0.16}
122. Ka2 {-9.36/12 0.26} Qf3 {+9.85/11 0.14}
123. Kb2 {-9.40/12 0.13} Qc3+ {+9.85/12 0.13}
124. Ka2 {-9.37/12 0.15} Qf3 {+9.85/13 0.40}
125. Kb2 {-9.40/12 0.16} g3 {+9.80/10 0.22}
126. Ra3 {-9.42/11 0.20} Qe2+ {+9.80/10 0.34}
127. Kb3 {-9.40/9 0.13} Kh4 {+9.84/10 0.17}
128. Ra1 {-9.36/10 0.14} Qb5+ {+9.84/11 0.17}
129. Kc2 {-9.36/11 0.14} Qc4+ {+9.81/12 0.22}
130. Kb2 {-9.42/13 0.17} Qc3+ {+9.81/13 0.16}
131. Ka2 {-9.43/11 0.14} Qf3 {+9.81/13 0.19}
132. Kb2 {-9.40/12 0.31} Qc3+ {+9.81/11 0.14}
133. Ka2 {-9.40/13 0.16} Qf3 {+9.80/13 0.14}
134. Kb2 {-9.39/11 0.13} Kg5 {+9.79/12 0.72}
135. Ka2 {-9.40/12 0.33} Qe3 {+9.84/11 0.23}
136. Kb2 {-9.43/12 0.32} Qc3+ {+9.83/12 0.17}
137. Ka2 {-9.42/10 0.19} Qe3 {+9.81/12 0.14}
138. Rh1 {-9.43/12 0.41} Qe2+ {+9.79/10 0.15}
139. Ka1 {-9.44/11 0.14} Qg2 {+9.79/11 0.26}
140. Rc1 {-9.43/10 0.29} Qf3 {+9.79/10 0.30}
141. Ka2 {-9.40/11 0.14} Kg4 {+9.82/9 0.19}
142. Ra1 {-9.40/10 0.16} Qe3 {+9.81/11 0.15}
143. Kb2 {-9.41/10 0.13} Qc3+ {+9.81/12 0.24}
144. Ka2 {-9.39/11 0.25} Qe3 {+9.80/11 0.23}
145. Kb2 {-9.40/11 0.13} Qc3+ {+9.80/11 0.14}
146. Ka2 {-9.40/13 0.16} Qf3 {+9.80/12 0.26}
147. Rc1 {-9.40/11 0.19} Kf4 {+9.81/10 0.12}
148. Kb2 {-9.38/11 0.16} Kg5 {+9.81/11 0.17}
149. Ka2 {-9.40/10 0.12} Qe2+ {+9.80/11 0.16}
150. Ka1 {-9.40/10 0.12} Qg2 {+9.82/11 0.16}
151. Re1 {-9.40/10 0.17} Kf6 {+9.80/10 0.18}
152. Rc1 {-9.40/11 0.13} Kg5 {+9.80/12 0.16}
153. Re1 {-9.41/12 0.33} Kf6 {+9.80/12 0.16}
154. Rc1 {-9.40/11 0.16} f4 {+9.84/11 0.20}
155. Rc8 {-9.38/11 0.18} Qe2 {+9.80/11 0.30}
156. Rb8 {-9.37/10 0.14} Kf5 {+9.79/9 0.13}
157. Rf8+ {-9.39/9 0.14} Ke6 {+9.79/9 0.13}
158. Rb8 {-9.37/9 0.16} Kf5 {+9.79/9 0.13}
159. Rf8+ {-9.39/9 0.14} Ke4 {+9.78/9 0.26}
160. Rb8 {-9.33/10 0.19} Kd5 {+9.77/8 0.12}
161. Kb1 {-9.35/11 0.34} Qf1+ {+9.77/9 0.16}
162. Ka2 {-9.33/10 0.18} Qf3 {+9.76/9 0.18}
163. Kb2 {-9.35/11 0.18} Qc3+ {+9.79/10 0.13}
164. Kb1 {-9.33/10 0.24} Ke4 {+9.78/10 0.17}
165. Ka2 {-9.36/10 0.22} Qc2+ {+9.83/10 0.19}
166. Ka3 {-9.33/10 0.27} Qc5+ {+9.79/10 0.34}
167. Kb2 {-9.34/11 0.17} Kf5 {+9.79/10 0.23}
168. Rh8 {-9.33/11 0.13} Qc3+ {+9.78/9 0.15}
169. Kb1 {-9.33/9 0.17} Qe1+ {+9.74/9 0.21}
170. Kb2 {-9.35/10 0.21} Qc3+ {+9.76/10 0.14}
171. Kb1 {-9.35/11 0.57} Qb3+ {+9.77/10 0.25}
172. Kc1 {-9.34/9 0.13} Qf3 {+9.77/10 0.15}
173. Kb2 {-9.35/11 0.25} Ke4 {+9.78/10 0.27}
174. Rb8 {-9.34/11 0.14} Qc3+ {+9.78/12 0.31}
175. Kb1 {-9.34/10 0.14} Qb3+ {+9.78/11 0.28}
176. Ka1 {-9.35/11 0.47} Qc2 {+9.77/10 0.23}
177. Rh8 {-9.35/11 0.14} Qd1+ {+9.77/10 0.15}
178. Ka2 {-9.33/9 0.14} Qd2+ {+9.77/11 0.27}
179. Kb3 {-9.35/10 0.12} Qc3+ {+9.74/10 0.13}
180. Ka2 {-9.35/11 0.18} Qc4+ {+9.75/10 0.13}
181. Ka3 {-9.35/10 0.13} Qc3+ {+9.74/11 0.14}
182. Ka4 {-9.35/8 0.13} Qa5+ {+9.76/10 0.20}
183. Kb3 {-9.30/1 0.001} Qb5+ {+9.75/10 0.12}
184. Ka2 {-9.36/11 0.24} Qc4+ {+9.75/10 0.17}
185. Ka3 {-9.35/10 0.18} Qc3+ {+9.77/9 0.14}
186. Ka2 {-9.34/11 0.17} Qf3 {+9.77/12 0.17}
187. Rb8 {-9.35/12 0.18} Qe2+ {+9.79/11 0.43}
188. Ka3 {-9.34/10 0.14} Qa6+ {+9.79/12 0.16}
189. Kb2 {-9.35/10 0.41} Qb5+ {+9.78/12 0.19}
190. Ka2 {-9.37/10 0.16} Qe2+ {+9.79/11 0.16}
191. Ka3 {-9.35/10 0.13} Qa6+ {+9.78/13 0.25}
192. Kb2 {-9.37/12 0.22} Qb5+ {+9.78/11 0.13}
193. Ka2 {-9.36/11 0.23} Qa5+ {+9.79/12 0.17}
194. Kb1 {-9.37/12 0.58} Qb4+ {+9.79/11 0.15}
195. Ka1 {-9.37/10 0.14} Qa5+ {+9.79/11 0.16}
196. Kb2 {-9.37/11 0.43} Qc3+ {+9.79/12 0.15}
197. Kb1 {-9.40/9 0.20} Qe1+ {+9.79/13 0.22}
198. Ka2 {-9.40/10 0.17} Qd2+ {+9.78/12 0.32}
199. Kb3 {-9.36/9 0.11} Qc3+ {+9.79/9 0.14}
200. Ka2 {-9.37/10 0.15} Qc2+ {+9.78/11 0.13}
{Draw by adjudication: maximal game length}
1/2-1/2[/pgn]

[amanjpro]

I noticed that Zahak is hovering around depth ten the entire endgame (second game).

This is expected in this case, Zahak just doesn't have time to see progress

[amanjpro]

As for bit genie, it had a bug probably that is in effect here too. Latest version 9.23 should be better

[Guenther]

As for bit genie, it had a bug probably that is in effect here too. Latest version 9.23 should be better

Probably this patch (which came slightly after my 9.19 compilation)
https://github.com/Aryan1508/Bit-Genie/pull/208

description:

Code: Select all

Causing engine to occasionally play losing moves while reporting draw, due to fifty-move rule mistakenly being activated

So may be also playing drawing moves while reporting draws in winning positions sometimes...
I guess this can be verified by setting up the endgame in question, we will see.

I am just compiling the newest one now, thanks for the hint, Amanj.

[Frank Quisinsky]

Hi Günther,

yes, can be see in the still running FCP-Tourney-KI.
Bit-Genie (I am using your compile 9.19), made many draw's in won position.
Elo for 9.19 can be around 25 Elo higher without this mistakes.

But all in all ...
Very, very nice work around Bit-Genie!!!

The programmer must be a programming hero.

Thanks to the programmer of Bit-Genie and to Günther for the compile!

Best
Frank

And yes, Zahak is very strong in endgames.
A wonderful development!
Two great engines, nice to have!!