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stegemma wrote:In the second log Pedone was playing with Black. Maybe now the problem gets from something related to timing in my GUI (but the GUI itself doen's hangs).

I know it should play for Black in your second log, but it calculated a White move Nc3? after 1.Nf3 from Sabrina...

Guenther wrote:

stegemma wrote:In the second log Pedone was playing with Black. Maybe now the problem gets from something related to timing in my GUI (but the GUI itself doen's hangs).

I know it should play for Black in your second log, but it calculated a White move Nc3? after 1.Nf3 from Sabrina...

I haven't noticed that! In effect, it seems that Pedone is playing white:
It appears as "position" command is ok but maybe I'm missing some other command to send from the GUI?

Here is a game with a 5men endgame which was not optimal solved by Pedone:

[pgn]
[Event "40 Züge in 8 min"]
[Site "Pedone, I56600K"]
[Date "2017.06.18"]
[Round "37.2"]
[White "ChessBrainVB 3.31"]
[Black "Pedone 1.6 x64 1CPU"]
[ECO "B90"]
[Result "0-1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be3
e5 7. Nb3 Be6 8. f3 h5 9. Qd2 Nbd7 10. Qf2 Rc8 11. O-O-O
Rxc3 12. bxc3 Qc7 13. c4 {+0.41/23 29s} Be7 {-0.65/24 16s
(Lxc4)} 14. Qd2 {+0.53/22 26s (De1)} b6 {-0.65/26 19s}
15. Kb1 {+0.57/21 19s} a5 {-0.65/26 15s (Lxc4)} 16. Qd3
{+0.47/22 26s} O-O {-0.65/27 20s} 17. Be2 {+0.43/22 14s}
Rb8 {-0.68/26 58s (Tc8)} 18. Rhe1 {-0.12/21 26s (Lf2)} Rc8
{-0.68/25 51s (a4)} 19. Nd2 {+0.39/21 25s (Lf2)} Nc5
{-0.69/24 45s (a4)} 20. Qa3 {+0.21/21 27s} b5 {-0.34/23
11s} 21. Bxc5 {-0.07/23 27s} b4 {-0.38/26 12s (dxc5)}
22. Bxb4 {+0.19/23 22s} axb4 {-0.05/28 16s} 23. Qa4
{+0.12/24 24s} Nd7 {-0.05/29 28s} 24. Ka1 {+0.16/24 17s}
Nc5 {-0.05/29 11s (Sb6)} 25. Qxb4 {+0.04/27 22s} Qa7
{-0.05/30 12s} 26. Rb1 {+0.07/26 8s} Ra8 {-0.05/30 10s}
27. Rb2 {+0.09/25 8s} Na4 {-0.05/30 9s} 28. Rd1 {+0.01/23
6s (Db7)} Nxb2 {+0.41/27 7s} 29. Qxb2 {+0.01/25 8s} h4
{+0.41/28 11s (Lg5)} 30. h3 {+0.05/22 6s} Bg5 {+0.39/27 8s}
31. Nb3 {+0.01/22 9s (c3)} Qf2 {+0.39/27 7s (Db6)} 32. Bf1
{+0.10/22 8s} Qb6 {+0.34/28 27s (Lf4)} 33. c3 {+0.15/20 11s
(Sc1)} Be3 {+0.34/26 12s (Ta4)} 34. Bd3 {+0.19/22 9s (Sc1)}
Kh8 {+0.39/22 6s (Lg5)} 35. Rb1 {+0.21/21 8s (Le2)} Qa6
{+0.21/24 6s (Kg8)} 36. Nd2 {+0.19/23 13s (De2)} Qa7
{+0.36/23 5s (Da4)} 37. Qc2 {+0.19/24 14s (Sf1)} g6
{+0.21/25 19s (Kg8)} 38. Nf1 {+0.18/26 12s} Bg1 {+0.26/26
3s (Lf4)} 39. Rb2 {+0.20/24 12s} Kg7 {+0.26/27 3s} 40. Qb1
{+0.18/27 17s} Bd7 {+0.23/27 5s (Lf2)} 41. Rb7 {+0.18/28
30s (De1)} Qa5 {+0.23/31 14s} 42. Qc2 {+0.01/28 18s} Bc8
{+0.13/30 41s (La4)} 43. Rb5 {+0.18/26 8s (Tb2)} Qa7
{+0.13/30 21s} 44. Rb3 {+0.18/26 10s (Tb2)} Be6 {+0.13/28
12s (Ld7)} 45. Rb4 {+0.18/27 8s (Tb2)} Qa5 {+0.13/30 19s
(Ld7)} 46. Qb2 {+0.18/26 7s (Tb2)} Bc5 {+0.13/30 10s (Da7)}
47. Rb7 {+0.21/23 7s (Tb5)} Bc8 {+0.13/32 11s} 48. Rb5
{+0.18/24 6s} Qa7 {+0.13/32 9s} 49. Rb3 {+0.18/26 6s (Dc2)}
Ba3 {+0.13/32 12s} 50. Qc2 {+0.18/28 6s} Bd7 {+0.13/33 15s
(Le6)} 51. Rb1 {+0.18/26 9s} Bc5 {+0.13/33 15s} 52. Nh2
{+0.26/25 13s (Tb2)} Be3 {+0.13/27 10s} 53. Ng4 {+0.26/25
6s} Bf4 {+0.13/30 10s} 54. Bf1 {+0.26/26 7s (Df2)} Qa5
{+0.13/28 9s (La4)} 55. Rb4 {+0.26/23 7s (Sf2)} Bg5
{+0.13/27 8s (Le6)} 56. Nf2 {+0.26/25 10s (Tb7)} Ra7
{+0.13/26 14s (Da7)} 57. Nd3 {+0.37/23 19s (Sg4)} Ba4
{-0.05/24 12s (Da6)} 58. Qf2 {+0.69/24 19s} Bd7 {-0.19/26
17s} 59. Rb2 {+0.62/25 7s} Qa3 {-0.21/25 8s (Ta8)} 60. Kb1
{+0.60/24 21s} Ba4 {-0.19/27 9s (Da4)} 61. Qe1 {+0.60/22 9s
(Db6)} Rc7 {-0.27/29 9s (Ld7)} 62. Nb4 {+0.63/24 9s} Rb7
{-0.27/31 34s (Tc8)} 63. Bd3 {+0.82/25 21s} Rb8 {-0.27/29
8s (Ld7)} 64. Bc2 {+0.93/24 25s} Bd7 {-0.32/28 12s} 65. Bb3
{+0.87/23 27s} Qa5 {-0.33/27 13s (Da7)} 66. Qd1 {+0.79/23
20s (Ka1)} Qb6 {-0.33/26 8s (Td8)} 67. c5 {+0.95/20 7s
(Ka1)} dxc5 {-0.55/26 9s} 68. Nd3 {+0.98/19 6s} Qc7
{-0.55/25 11s (Dd6)} 69. Bd5 {+1.17/21 17s} Bb5 {-0.66/25
13s (Le8) } 70. a4 {+1.20/22 18s} Ba6 {-0.70/25 5s}
71. Rxb8 {+1.30/22 15s} Qxb8+ {-0.70/25 7s} 72. Nb2
{+1.44/20 7s} c4 {-0.66/29 6s (Db6)} 73. Ka2 {+0.90/22 7s
(a5)} Qc7 {-0.83/25 5s} 74. Qf1 {+1.59/23 9s (De2)} Qa7
{-0.72/27 6s} 75. Bxc4 {+1.36/25 9s} Bxc4+ {-0.20/30 5s}
76. Qxc4 {+1.19/25 10s} Qf2 {-0.05/31 13s} 77. a5 {+1.01/25
8s} Qxg2 {-0.05/30 10s} 78. a6 {+0.71/24 8s} Be3 {-0.05/30
4s} 79. Qd3 {+0.64/22 5s} Bg1 {-0.05/30 5s} 80. Qd1
{+0.53/23 7s (Dd7)} Be3 {-0.05/28 4s (La7)} 81. Qd7
{+0.47/23 41s} Qxf3 {-0.05/30 12s (Lg1)} 82. Nc4 {+0.14/21
18s} Bg1 {-0.05/30 25s} 83. Kb2 {+0.07/22 16s} Qxe4
{-0.05/30 14s} 84. Qxf7+ {+0.01/25 17s (Sd6)} Kxf7
{+1.87/33 16s} 85. Nd6+ {+0.01/26 12s} Kf6 {+2.49/34 30s
(Ke6)} 86. Nxe4+ {-0.80/28 23s} Kf5 {+2.79/35 40s} 87. Nd2
{-0.93/30 19s} g5 {+3.46/34 8s} 88. c4 {-1.24/28 15s (Sf3)}
g4 {+4.28/32 16s (La7)} 89. hxg4+ {-2.18/24 14s} Kxg4
{+4.39/33 10s} 90. Ne4 {-2.26/27 8s} h3 {+5.06/32 9s}
91. c5 {-2.23/26 7s} h2 {+5.06/32 11s (Ld4+)} 92. a7
{-2.31/25 7s} h1=Q {+5.87/31 32s} 93. a8=Q {-2.14/24 7s}
Bd4+ {+5.57/30 33s} 94. Kb3 {-2.11/21 11s} Qf3+ {+6.08/30
29s} 95. Kc4 {-2.41/19 7s} Kf4 {+5.92/28 8s} 96. Qd8
{-2.55/19 6s (Dh8)} Qe2+ {+6.69/27 8s (Kxe4)} 97. Kd5
{-2.76/17 16s (Kb4)} Qxe4+ {+M282/26 7s} 98. Kd6 {-3.29/20
22s (Ke6)} Bxc5+ {+M266/28 8s (Dg6+)} 99. Kxc5 {-1.67/18
13s (Ke6)} Qc2+ {+M262/127 0s (De3+)} 100. Kb5 {-1.47/16
16s} Qe2+ {+M262/39 5s} 101. Kc6 {-1.80/18 15s} Qc4+
{+M262/35 8s} 102. Kb7 {-1.90/21 18s} Qb3+ {+M262/35 26s
(e4)} 103. Kc7 {-1.74/19 14s} Qc3+ {+M264/33 7s} 104. Kb8
{-1.90/21 10s} Qb2+ {+M264/33 11s (Db4+)} 105. Kc7
{-1.71/21 15s} Qc1+ {+M262/36 7s (Dc2+)} 106. Kb7 {-1.29/19
11s} Qb1+ {+M260/22 5s} 107. Ka7 {-1.32/20 4s} Qg1+
{+M260/24 6s (Da1+)} 108. Kb8 {-1.48/20 3s} Qc5 {+M260/25
5s (Dd4)} 109. Qd2+ {-1.48/20 9s (Df6+)} Kg3 {+M262/37 7s
(Ke4)} 110. Qd3+ {-1.38/21 11s} Kh4 {+M260/24 5s (Kg4)}
111. Qe4+ {-1.38/20 6s} Kg5 {+M260/27 5s} 112. Kb7
{-1.55/21 4s (Ka8)} Qd4 {+M280/27 6s} 113. Qg2+ {-1.58/21
3s} Kf5 {+M260/27 6s (Kf4)} 114. Qh3+ {-1.66/21 4s} Ke4
{+M260/28 5s (Kf4)} 115. Kc6 {-1.48/20 5s (Df1)} Qc4+
{+M260/26 5s (Dd5+)} 116. Kd6 {-0.91/20 7s (Kb7)} Qd5+
{+M262/36 5s (Kd4)} 117. Ke7 {-0.91/18 5s (Kc7)} Kd4
{+M260/21 3s} 118. Qh8 {-0.91/21 6s} Qc5+ {+M260/24 5s}
119. Ke6 {-0.91/19 7s} Qc6+ {+M260/25 4s} 120. Ke7
{-0.91/20 4s } Qa6 {+M260/27 4s (Db7+)} 121. Kd7 {-0.90/21
47s} Qg6 {+M260/28 15s (Dd3)} 122. Ke7 {-0.79/22 17s} Qc6
{+M260/30 31s (Db6)} 123. Qd8+ {-0.50/22 21s} Qd5 {+M260/41
1s (Ke4)} 124. Qh8 {-0.79/22 9s} Kc5 {+M260/24 0s (Db7+)}
125. Qc8+ {-0.92/22 9s} Qc6 {+M260/26 1s} 126. Qf5
{-0.99/21 9s} Qd6+ {+M260/25 1s} 127. Ke8 {-1.00/22 8s} Qd5
{+M260/26 4s} 128. Qf8+ {-1.08/21 6s (Df2+)} Kb6 {+M260/27
1s} 129. Qf2+ {-1.18/23 18s} Qc5 {+M260/24 2s (Kb7)}
130. Qg3 {-0.80/21 22s (De1)} Qc6+ {+M260/25 2s (Dd4)}
131. Ke7 {-1.08/21 19s} e4 {+M260/28 1s} 132. Qb3+
{-1.09/24 6s} Kc7 {+M260/34 16s} 133. Qg3+ {-1.04/24 9s}
Kb7 {+M260/35 16s} 134. Qb3+ {-1.16/25 19s} Ka8 {+M260/35
26s} 135. Kd8 {-0.31/25 18s (Da3+)} Qd6+ {+M280/30 1s}
136. Kc8 {-1.24/23 14s} Qc5+ {+M280/37 13s} 137. Kd7
{-1.17/28 8s} e3 {+M280/37 3s} 138. Qd3 {-1.23/29 17s} Kb7
{+M280/37 14s (Ka7)} 139. Qb3+ {-1.24/28 6s} Qb6 {+M260/38
13s} 140. Qd5+ {-1.51/25 15s (Dc4)} Ka7 {+M260/36 16s}
141. Qd3 {-1.87/25 16s} Qb7+ {+M280/35 13s} 142. Kd8
{-1.90/24 5s} Qb8+ {+M260/35 11s} 143. Kd7 {-2.15/24 15s}
Qb6 {+M280/37 17s} 144. Qa3+ {-2.16/24 4s} Kb7 {+M280/38
16s} 145. Qc3 {-2.16/25 9s (Dd3)} Qb5+ {+M260/30 26s}
146. Ke7 {-2.28/25 8s} Qe2 {+M260/30 12s (e2)} 147. Ke6
{-2.36/21 13s} Qd2 {+M260/33 11s} 148. Qb3+ {-2.36/24 6s}
Kc7 {+M260/33 17s (Kc6)} 149. Qc4+ {-2.57/25 23s} Kb6
{+M260/34 28s} 150. Qb3+ {-3.06/22 5s} Kc5 {+M260/34 9s}
151. Qa3+ {-3.22/23 10s} Kc4 {+M260/34 16s} 152. Qa6+
{-3.23/22 6s} Kb3 {+M260/35 25s} 153. Qb5+ {-3.79/25 6s}
Kc2 {+M260/35 20s (Ka2)} 154. Qa4+ {-3.80/25 4s (Dc4+)} Kb2
{+M260/35 30s} 155. Qb5+ {-3.80/27 6s} Kc1 {+M260/29 5s}
156. Qa6 {-3.87/23 7s} Qb2 {+M280/32 8s} 157. Qf1+
{-4.69/23 5s (Dc4+)} Kd2 {+M280/22 0s} 158. Qf4 {-5.53/25
8s} Qa3 {+M260/28 6s (Db3+)} 159. Qd4+ {-4.66/22 6s} Kc2
{+M280/33 4s (Dd3)} 160. Qc4+ {-3.96/24 6s} Qc3 {+M280/33
8s} 161. Qe2+ {-5.60/28 48s} Kc1 {+M260/34 10s} 162. Kf7
{-5.60/28 9s (Ke7)} Qd2 {+M260/30 10s} 163. Qf1+ {-5.68/25
7s} Qd1 {+M260/31 18s} 164. Qf4 {-5.69/27 15s} Qd5+
{+M280/31 13s} 165. Kg6 {-5.86/25 18s (Kg7)} Kd2 {+M260/32
13s} 166. Kh6 {-6.07/26 15s (Kf6)} Kd3 {+M260/30 14s}
167. Qg3 {-6.13/26 17s} Qd4 {+M260/31 12s } 168. Kg6
{-9.16/25 29s} Kd2 {+M260/31 12s} 169. Qg5 {-9.54/24 15s}
Qd3+ {+M260/31 13s} 170. Kh5 {-9.55/22 14s (Kg7)} Kc2
{+M260/30 18s (Kd1)} 171. Qc5+ {-9.51/22 7s (Df4)} Kd1
{+M260/34 14s} 172. Qb4 {-9.93/23 13s (De5)} e2 {+M260/31
30s} 173. Qa4+ {-9.93/23 18s} Kd2 {+M260/31 39s} 174. Qf4+
{-16.26/20 17s} Kc3 {+M700/28 36s} 175. Qe5+ {16s
+M-604/20} Kc4 {+M54/22 9s} 176. Qf4+ {12s +M-597/21} Kb3
{+M40/24 7s} 177. Qb8+ {13s +M-603/22 (Df7+)} Kc2 {+M32/25
15s} 178. Qe5 {6s +M-605/24} Qf3+ {+M30/24 13s (Dh3+)}
179. Kg6 {12s +M-578/22} Qg2+ {+M28/24 11s} 180. Kh6 {15s
+M-565/23} Qh1+ {+M26/24 11s} 181. Kg6 {4s +M-549/22 (Kg5)}
e1=Q {+M22/25 8s} 182. Qc5+ {8s +M-547/32} Qc3 {+M20/25
12s} 183. Qf5+ {4s +M-546/31} Qd3 {+M18/26 6s (Kd2)}
184. Qxd3+ {4s +M-544/38} Kxd3 {+M16/27 0s} 185. Kf6 {8s
+M-543/40 (Kf5)} Qd5 {+M14/43 6s (De4)} 186. Ke7 {5s
+M-542/45} Ke4 {+M12/86 6s} 187. Kf6 {10s +M-541/61} Qc6+
{+M10/127 1s (De5+)} 188. Kf7 {1s +M-540/61 (Ke7)} Kf5
{+M8/127 0s} 189. Kg7 {0s +M-539/61} Qd7+ {+M6/127 0s}
190. Kf8 {0s +M-538/16 (Kg8)} Kf6 {+M4/127 0s} 191. Kg8 {0s
+M-537/1} Qg7# {+M2/127 0s} 0-1 [/pgn]

Thank you. I'll have a look.