stockfish 3-fold rep bug

[mdtr]

i have several games where Stockfish 17/04/16 (default parameters, single cpu) drew with 3-fold winning games or at least with a good advantage, the last one against rybka 2.3:

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8.<br> c3 O-O 9. h3 Bb7 10. d4 Re8 11. Nbd2 {+0.06/13 7} exd4 {-0.17/19 2} 12.<br> cxd4 {0.00/13 1} Nd7 {-0.19/21 2} 13. Nf1 {+0.19/13 7} Na5 {-0.17/21 2} 14.<br> Bc2 {+0.26/12 2} Bf6 {-0.14/20 1} 15. Bf4 {+0.17/11 0} Nf8 {-0.20/18 0} 16.<br> Bg3 {+0.15/12 3} Nc4 {-0.17/20 2} 17. N1d2 {+0.21/12 1} Nxd2 {-0.15/20 1}<br> 18. Qxd2 {+0.19/10} c5 {-0.12/19 0} 19. dxc5 {+0.08/12 3} dxc5 {+0.31/22 0}<br> 20. e5 {+0.17/12 0} Be7 {+0.28/22 0} 21. Rad1 {+0.05/13 2} Bxf3 {+0.31/23<br> 2} 22. gxf3 {+0.07/15 3} Qxd2 {+0.40/22 0} 23. Rxd2 {+0.20/14 0} Ne6<br> {+0.23/24 1} 24. Red1 {+0.16/15 2} Rad8 {+0.23/21 0} 25. Be4 {+0.12/16 4}<br> c4 {+0.22/23 4} 26. Kf1 {0.00/14 1} Rxd2 {+0.34/22 3} 27. Rxd2 {0.00/14 0}<br> g5 {+0.39/22 1} 28. Rd7 {+0.05/13 2} h5 {+0.49/21 2} 29. Ra7 {+0.23/13 1}<br> h4 {+0.67/20 0} 30. Bh2 {+0.09/13 0} Bc5 {+0.60/19 0} 31. Rxa6 {+0.25/13 0}<br> Rd8 {+0.63/23 1} 32. Ke2 {+0.02/14 1} b4 {+0.88/23 1} 33. Ra8 {-0.02/15 0}<br> Nd4+ {+0.62/26 1} 34. Ke1 {-0.22/17 0} Rxa8 {+0.60/27 0} 35. Bxa8 {-0.22/18<br> 0} c3 {+0.60/31 2} 36. b3 {-0.24/18 0} Ne6 {+0.60/31 0} 37. Be4 {-0.25/18<br> 0} Kf8 {+0.60/31 1} 38. Kf1 {-0.31/18 1} Bb6 {+0.62/27 2} 39. Ke2 {-0.31/18<br> 1} Ke7 {+0.69/25 1} 40. Ke1 {-0.31/17 0} Nd4 {+1.21/24 1} 41. Bd5 {-0.31/17<br> 1} Ba7 {+1.57/25 1} 42. Bb7 {-0.41/16 0} Bb8 {+1.62/27 0} 43. Bd5 {-0.38/16<br> 0} Kd8 {+1.68/25 0} 44. Kd1 {-0.35/17 0} f5 {+1.70/30 0} 45. Kc1 {-0.96/17<br> 0} f4 {+2.05/34 0} 46. Be4 {-0.96/19 1} Bxe5 {+2.05/37 1} 47. Kb1 {-1.04/19<br> 0} Kd7 {+2.01/35 6} 48. Bd5 {-1.04/20 0} Bf6 {+2.01/30 0} 49. Kc1 {-1.04/19<br> 0} Be5 {+2.01/33 0} 50. Kb1 {0.00/25 0} Ke7 {+2.01/33 0} 51. Kc1 {-1.04/20<br> 0} Kd7 {+2.01/29 0} 52. Kb1 {0.00/27 0 3-fold repetition} 1/2-1/2

last position analysis: -4,19

FEN: 8/3k4/8/3Bb1p1/1p1n1p1p/1Pp2P1P/P4P1B/1K6 b - - 11 52

Stockfish 170416:
28/43 00:00 447k 4.383k -2,68 Kd7-d6 Bd5-b7 Be5-f6 Kb1-c1 Kd6-e5 Bb7-a8 Bf6-d8 Kc1-d1 Nd4-e6 Ba8-b7 Bd8-c7 Bb7-a8 Bc7-b6 Bh2-g1 Bb6-a5 Ba8-b7 Ne6-d4 Bg1-h2 Ba5-c7 Bb7-a8 Nd4-e6 Ba8-b7 Ke5-f6 Bb7-d5 g5-g4 h3xg4 Ne6-g5 Kd1-e2 Kf6-e5 Bd5-e4 Ng5-e6 Ke2-d3 Bc7-b6 Kd3-c4 Ne6-g5 Be4-d3 Ng5xf3
29/47 00:00 792k 4.400k -2,72 Kd7-d6 Bd5-b7 Be5-f6 Kb1-c1 Kd6-e5 Bb7-a8 Bf6-d8 Kc1-d1 Nd4-e6 Ba8-b7 Bd8-c7 Bb7-a8 Bc7-b6 Bh2-g1 Bb6-a5 Ba8-b7 Ne6-d4 Bg1-h2 Ba5-c7 Bb7-a8 Nd4-e6 Ba8-b7 Ke5-f6 Bh2-g1 g5-g4 f3xg4 f4-f3 Bb7-a6 Ne6-d4 Ba6-d3 c3-c2+ Bd3xc2 Nd4-e2 Bg1-h2 Bc7xh2 Kd1-e1 Ne2-g1 Bc2-e4 Kf6-g5 Ke1-f1 Ng1xh3 Be4xf3 Bh2-e5 Bf3-e4 Kg5xg4 f2-f3+ Kg4-g3
30/47 00:00 1.075k 4.266k -2,72 Kd7-d6 Bd5-b7 Be5-f6 Kb1-c1 Kd6-e5 Bb7-a8 Bf6-d8 Kc1-d1 Bd8-c7 Ba8-b7 Bc7-b6 Bb7-a8 Nd4-e6 Bh2-g1 Bb6-a5 Ba8-b7 Ne6-d4 Bg1-h2 Ba5-c7 Bb7-a8 Nd4-e6 Ba8-b7 Ke5-f6 Bh2-g1 g5-g4 f3xg4 f4-f3 Bb7-a6 Ne6-d4 Ba6-d3 c3-c2+ Bd3xc2 Nd4-e2 Bg1-h2 Bc7xh2 Kd1-e1 Ne2-g1 Bc2-e4 Kf6-g5 Ke1-f1 Ng1xh3 Be4xf3 Bh2-e5 Bf3-e4 Kg5xg4
31/50 00:00 2.699k 4.165k -2,74 Kd7-d6 Bd5-b7 Be5-f6 Kb1-c1 Kd6-e5 Bb7-a8 Bf6-d8 Kc1-d1 Bd8-c7 Ba8-b7 Bc7-b6 Bb7-a8 Nd4-e6 Bh2-g1 Bb6-a5 Ba8-b7 Ne6-d4 Bg1-h2 Ba5-c7 Bb7-a8 Nd4-e6 Ba8-b7 Ke5-f6 Bb7-a8 Bc7-b6 Bh2-g1 g5-g4 f3xg4 Ne6-g5 Ba8-g2 f4-f3 Bg2-f1 Bb6-c7 Kd1-c2 Ng5-e6 g4-g5+ Kf6xg5 Kc2-d1 Ne6-d4 Bf1-d3 c3-c2+ Bd3xc2 Nd4-e2 Kd1-d2 Ne2xg1
32/50 00:00 2.973k 4.147k -2,74 Kd7-d6 Bd5-b7 Be5-f6 Kb1-c1 Kd6-e5 Bb7-a8 Bf6-d8 Kc1-d1 Bd8-c7 Ba8-b7 Bc7-b6 Bb7-a8 Nd4-e6 Bh2-g1 Bb6-a5 Ba8-b7 Ne6-d4 Bg1-h2 Ba5-c7 Bb7-a8 Nd4-e6 Ba8-b7 Ke5-f6 Bb7-a8 Bc7-b6 Bh2-g1 g5-g4 f3xg4 Ne6-g5 Ba8-g2 f4-f3 Bg2-f1 Bb6-c7 Kd1-c2 Ng5-e6 g4-g5+ Kf6xg5 Kc2-d1 Ne6-d4 Bf1-d3 c3-c2+ Bd3xc2 Nd4-e2 Bc2-e4 Ne2xg1
33/50 00:01 7.228k 4.851k -2,74 Kd7-d6 Bd5-b7 Be5-f6 Kb1-c1 Kd6-e5 Bb7-a8 Bf6-d8 Kc1-d1 Bd8-c7 Ba8-b7 Bc7-b6 Bb7-a8 Nd4-e6 Bh2-g1 Bb6-a5 Ba8-b7 Ne6-d4 Bg1-h2 Ba5-c7 Bb7-a8 Nd4-e6 Ba8-b7 Ke5-f6 Bb7-d5 g5-g4 h3xg4 Ne6-g5 Bd5-e4 Kf6-e5 Kd1-e2 Ng5-e6 Ke2-d3 Bc7-b6 Kd3-c4 Ne6-g5 Be4-d3 Ng5xf3 g4-g5 Nf3xg5 Kc4xb4 Bb6-d4 Bd3-g6 Ng5-f3
34/53 00:01 8.316k 4.926k -2,74 Kd7-d6 Bd5-b7 Be5-f6 Kb1-c1 Kd6-e5 Bb7-a8 Bf6-d8 Kc1-d1 Bd8-c7 Ba8-b7 Bc7-b6 Bb7-a8 Nd4-e6 Bh2-g1 Bb6-a5 Ba8-b7 Ne6-d4 Bg1-h2 Ba5-c7 Bb7-a8 Nd4-e6 Kd1-e1 Ke5-f6 Ba8-c6 g5-g4 f3xg4 Ne6-g5 f2-f3 Kf6-e5 Bh2-g1 Ng5xh3 Bg1-a7 Bc7-d6 Ke1-e2 Nh3-g5 Ba7-g1 h4-h3 Ke2-d1 Bd6-c5 Bg1xc5 h3-h2
35/53 00:01 8.744k 4.940k -2,74 Kd7-d6 Bd5-b7 Be5-f6 Kb1-c1 Kd6-e5 Bb7-a8 Bf6-d8 Kc1-d1 Bd8-c7 Ba8-b7 Bc7-b6 Bb7-a8 Nd4-e6 Bh2-g1 Bb6-a5 Ba8-b7 Ne6-d4 Bg1-h2 Ba5-c7 Bb7-a8 Nd4-e6 Kd1-e1 Ke5-f6 Ba8-e4 g5-g4 f3xg4 Ne6-g5 f2-f3 Ng5xe4 f3xe4 Kf6-e5 Bh2-g1 f4-f3 Bg1-c5 Bc7-d6 Bc5-f2 Ke5xe4 Bf2xh4 Bd6-f4 Bh4-f6 c3-c2 Bf6-b2 c2-c1Q+ Bb2xc1 Bf4xc1 h3-h4 Bc1-e3 h4-h5 Ke4-d3
36/55 00:03 17.567k 5.202k -2,78 Kd7-d6 Bd5-b7 Be5-f6 Kb1-c1 Kd6-e5 Bb7-a8 Bf6-d8 Kc1-d1 Bd8-c7 Ba8-b7 Bc7-b6 Bb7-a8 Nd4-e6 Bh2-g1 Bb6-d8 Bg1-h2 Bd8-c7 Ba8-b7 Ke5-f6 Bb7-d5 g5-g4 f3xg4 Ne6-g5 Kd1-c2 Ng5xh3 Bd5-g2 Nh3-g5 f2-f3 h4-h3 Bg2-h1 Bc7-d6 Bh2-g1 Ng5-e6 Bg1-f2 Kf6-g5 Kc2-d3 Bd6-c5 Bf2-e1 Bc5-d4 Kd3-c2 Bd4-e3 Kc2-d3 Ne6-d4 Be1xc3 b4xc3 Kd3xc3
37/55 00:05 28.691k 5.234k -2,81 Kd7-d6 Bd5-b7 Be5-f6 Kb1-c1 Kd6-e5 Bb7-a8 Bf6-d8 Kc1-d1 Bd8-c7 Ba8-b7 Bc7-b6 Bb7-a8 Nd4-e6 Bh2-g1 Bb6-a5 Ba8-b7 Ne6-d4 Bg1-h2 Ba5-c7 Bb7-a8 Nd4-e6 Ba8-b7 Ke5-f6 Bb7-e4 g5-g4 f3xg4 Ne6-g5 Be4-d3 Ng5xh3 f2-f3 Kf6-e5 Bd3-c2 Bc7-b6 Kd1-e2 Bb6-e3 Bc2-d1 Nh3-g5 Ke2-d3 h4-h3 Bd1-e2 Be3-b6 Be2-d1 Ng5-e6 Kd3-e2 Bb6-e3
38/55 00:07 37.776k 5.153k -2,81 Kd7-d6 Bd5-b7 Be5-f6 Kb1-c1 Kd6-e5 Bb7-a8 Bf6-d8 Kc1-d1 Bd8-c7 Ba8-b7 Bc7-b6 Bb7-a8 Nd4-e6 Bh2-g1 Bb6-a5 Ba8-b7 Ne6-d4 Bg1-h2 Ba5-c7 Bb7-a8 Bc7-d8 Kd1-e1 Nd4-e6 Ke1-d1 Bd8-c7 Ba8-b7 Ke5-f6 Bb7-d5 g5-g4 f3xg4 Ne6-g5 Kd1-c2 Ng5xh3 Bd5-g2 Nh3-g5 Bg2-b7 Kf6-e5 a2-a4 b4xa3/ep Kc2xc3 Ng5-e4+ Kc3-c2 Ne4xf2 Bh2-g1
39/55- 00:11 61.592k 5.187k -2,88 Kd7-d6
39/55 00:18 97.055k 5.271k -2,90 Kd7-d6 Bd5-b7 Be5-f6 Bb7-e4 Bf6-d8 Kb1-c1 Kd6-e5 Be4-a8 Bd8-b6 Kc1-d1 Bb6-c7 Ba8-b7 Nd4-e6 Bb7-a8 Ke5-f6 Kd1-c1 Bc7-b6 Bh2-g1 g5-g4 f3xg4 Ne6-g5 Kc1-c2 Ng5xh3 Bg1-h2 Kf6-e5 Ba8-g2 Nh3-g5 Bh2-g1 h4-h3 Bg2-b7 Ng5-e4 g4-g5 Ne4xg5 Kc2-d3 Ng5-e6 Bb7-f3 Bb6-c5 Bf3-b7 Ne6-d4 Bg1-h2 Bc5-b6 f2-f3 Nd4-e6 Bb7-c8 Ne6-g5
40/55- 00:20 108.064k 5.283k -2,97 Kd7-d6
40/55 00:24 128.704k 5.312k -2,98 Kd7-d6 Bd5-b7 Be5-f6 Bb7-e4 Kd6-e5 Be4-b7 Bf6-e7 Kb1-c1 Be7-d8 Bb7-a8 Bd8-b6 Kc1-d1 Bb6-c7 Ba8-b7 Nd4-e6 Bb7-a8 Ke5-f6 Ba8-d5 g5-g4 f3xg4 Ne6-g5 Kd1-c2 Ng5xh3 Bd5-g2 Nh3-g5 f2-f3 h4-h3 Bg2-h1 Bc7-d6 Bh2-g1 Ng5-e6 Bg1-a7 Kf6-g5 Ba7-f2 Bd6-c5 Bf2-e1 Bc5-e3 Be1xc3 b4xc3 Kc2xc3 Kg5-h4 Kc3-d3 Kh4-g3 Kd3-e4
41/55- 00:29 157.484k 5.349k -3,05 Kd7-d6
41/60 00:58 312.133k 5.314k -3,34 Kd7-d6 Bd5-b7 Be5-f6 Bb7-e4 Kd6-e5 Be4-b7 Bf6-e7 Kb1-c1 Be7-d8 Kc1-d1 Bd8-b6 Bb7-a8 Bb6-c7 Kd1-c1 Nd4-e6 Kc1-d1 Ke5-f6 Ba8-e4 g5-g4 f3xg4 Ne6-g5 f2-f3 Kf6-e5 Bh2-g1 Ng5xh3 Bg1-c5 Bc7-d6 Bc5-a7 Nh3-g5 Be4-b7 h4-h3 Ba7-g1 Bd6-c5 Bg1-h2 Bc5-f2 Kd1-e2 Bf2-e3 Ke2-d1 Be3-b6 Kd1-e2 Bb6-f2 Bb7-a8 Ng5-e6 Ba8-e4 Bf2-e3 Ke2-d1
42/60- 01:13 392.967k 5.331k -3,58 Kd7-d6
42/63- 01:37 508.952k 5.238k -3,73 Be5-c7
42/63 02:24 752.586k 5.221k -4,19 Be5-c7 Kb1-c1 Kd7-d6 Bd5-e4 Kd6-e5 Be4-b7 Nd4-e6 Kc1-d1 Ke5-f6 Bb7-d5 g5-g4 f3xg4 Ne6-g5 Kd1-c2 Ng5xh3 Bd5-g2 Nh3-g5 Bg2-b7 Kf6-e5 a2-a4 b4xa3/ep Kc2xc3 Ng5-e4+ Kc3-c2 Ne4xf2 Bh2-g1 Nf2-d1 Kc2-b1 Bc7-d6 Bb7-g2 Nd1-c3+ Kb1-a1 Nc3-e4 Bg1-h2 Ne4-g5 Ka1-a2 h4-h3 Bg2-b7 Bd6-e7 Ka2-b1 Be7-c5 Bb7-c6 Bc5-d6 Bc6-b7 Ng5-e4 Kb1-c2 Bd6-c5 Kc2-b1 Ne4-d2+ Kb1-a2