Stockfish - Ethereal ending

I am writing a new PGN tool and came across this game.

[pgn]
[Event "CPU-engine testing"]
[Site "?"]
[Date "2020.10.10"]
[Round "114"]
[White "Ethereal 12.75 avx2"]
[Black "Stockfish 12 200902"]
[Result "0-1"]
[ECO "C89"]
[PlyCount "242"]
[EventDate "2020.??.??"]
[TimeControl "180+1"]

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 O-O 8.c3
d5 9.exd5 Nxd5 10.Nxe5 Nxe5 11.Rxe5 c6 12.Re1 Bd6 13.d3 Bf5 14.Qf3
Qf6 15.Nd2 Qg6 16.Nf1 Bxd3 17.Bxd5 cxd5 18.Qxd5 h6 19.Ng3 Rad8 20.Qf3
b4 21.Bd2 Bb5 22.Nf5 Kh7 23.Nd4 Bc5 24.Be3 bxc3 25.bxc3 Bc4 26.Nc6
Bxe3 27.Nxd8 Bd2 28.Ne6 Bxe6 29.Rxe6 Qxe6 30.Qd3 g6 31.Qxd2 Rc8 32.Rc1
h5 33.h3 Rc5 34.Re1 Qc4 35.Re3 Ra5 36.a3 Rxa3 37.Qd6 Ra1 38.Kh2 Ra5
39.Rf3 Rf5 40.Rxf5 gxf5 41.Qe5 Kg6 42.Qg3 Kf6 43.Qd6 Kg7 44.Qg3 Kf6
45.Qd6 Kg7 46.Kg1 h4 47.Qe5 Kg6 48.g3 Qe6 49.Qf4 Qe1 50.Kh2 Qxc3 51.Qxh4
a5 52.Qd8 a4 53.h4 Qf6 54.Qg8 Qg7 55.Qd8 Kh7 56.Qe7 f6 57.Qe6 a3 58.Qxf5
Kg8 59.Qd5 Qf7 60.Qa8 Qf8 61.Qa7 Qd6 62.Qa8 Kh7 63.Qe4 Kh6 64.Qe3 Kg6
65.Qe8 Kg7 66.h5 f5 67.Qa8 Qe7 68.Qa5 Qd6 69.Qxf5 a2 70.Qa5 Qe6 71.g4
Qd6 72.Kh3 Qe6 73.f3 Qb3 74.Qe5 Kf8 75.Qf6 Ke8 76.Qg6 Kd8 77.Qf6 Kc7
78.Qe7 Kb8 79.Qd6 Kb7 80.Qd7 Kb6 81.Qd8 Ka6 82.Qa8 Kb5 83.Kh4 Qe6 84.Kh3
Kb4 85.Qb7 Kc4 86.Qb2 Kd3 87.Qa3 Kd2 88.Qa5 Ke2 89.Kg2 Qb3 90.Qe5 Qe3
91.Qb2 Qd2 92.Qa1 Ke3 93.Kg3 Ke2 94.Kg2 Qc2 95.Qe5 Kd1 96.Kh3 Qb3 97.Qd6
Kc1 98.Qc5 Kd1 99.Qf2 Qa3 100.Qd4 Ke2 101.Qe5 Kf1 102.Qa1 Kf2 103.Kh4
Qe7 104.Kh3 Qa3 105.Kh4 Kg2 106.h6 Qe7 107.Kh5 Qc5 108.Kh4 Qf2 109.Kg5
Qc5 110.Kh4 Qc2 111.Qe5 Kf1 112.Qf6 Qb1 113.h7 Qxh7 114.Kg3 Qc7 115.f4
Qc2 116.g5 Qf2 117.Kh3 Qe3 118.Kg4 Qe1 119.f5 Qd1 120.Kh4 a1 121.Qxa1
[/pgn]

[puzzle]
[Setup "1"]
[FEN "8/8/7P/8/6PK/q4P2/p5k1/Q7 b - - 0 106"]
106..Qe7+
[/puzzle]

Where did Ethereal went wrong after 106..Qe7+ ?

It's a draw after 108 g5, isn't it?

Admin wrote:

I am writing a new PGN tool and came across this game.

[pgn]
[Event "CPU-engine testing"]
[Site "?"]
[Date "2020.10.10"]
[Round "114"]
[White "Ethereal 12.75 avx2"]
[Black "Stockfish 12 200902"]
[Result "0-1"]
[ECO "C89"]
[PlyCount "242"]
[EventDate "2020.??.??"]
[TimeControl "180+1"]

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 O-O 8.c3
d5 9.exd5 Nxd5 10.Nxe5 Nxe5 11.Rxe5 c6 12.Re1 Bd6 13.d3 Bf5 14.Qf3
Qf6 15.Nd2 Qg6 16.Nf1 Bxd3 17.Bxd5 cxd5 18.Qxd5 h6 19.Ng3 Rad8 20.Qf3
b4 21.Bd2 Bb5 22.Nf5 Kh7 23.Nd4 Bc5 24.Be3 bxc3 25.bxc3 Bc4 26.Nc6
Bxe3 27.Nxd8 Bd2 28.Ne6 Bxe6 29.Rxe6 Qxe6 30.Qd3 g6 31.Qxd2 Rc8 32.Rc1
h5 33.h3 Rc5 34.Re1 Qc4 35.Re3 Ra5 36.a3 Rxa3 37.Qd6 Ra1 38.Kh2 Ra5
39.Rf3 Rf5 40.Rxf5 gxf5 41.Qe5 Kg6 42.Qg3 Kf6 43.Qd6 Kg7 44.Qg3 Kf6
45.Qd6 Kg7 46.Kg1 h4 47.Qe5 Kg6 48.g3 Qe6 49.Qf4 Qe1 50.Kh2 Qxc3 51.Qxh4
a5 52.Qd8 a4 53.h4 Qf6 54.Qg8 Qg7 55.Qd8 Kh7 56.Qe7 f6 57.Qe6 a3 58.Qxf5
Kg8 59.Qd5 Qf7 60.Qa8 Qf8 61.Qa7 Qd6 62.Qa8 Kh7 63.Qe4 Kh6 64.Qe3 Kg6
65.Qe8 Kg7 66.h5 f5 67.Qa8 Qe7 68.Qa5 Qd6 69.Qxf5 a2 70.Qa5 Qe6 71.g4
Qd6 72.Kh3 Qe6 73.f3 Qb3 74.Qe5 Kf8 75.Qf6 Ke8 76.Qg6 Kd8 77.Qf6 Kc7
78.Qe7 Kb8 79.Qd6 Kb7 80.Qd7 Kb6 81.Qd8 Ka6 82.Qa8 Kb5 83.Kh4 Qe6 84.Kh3
Kb4 85.Qb7 Kc4 86.Qb2 Kd3 87.Qa3 Kd2 88.Qa5 Ke2 89.Kg2 Qb3 90.Qe5 Qe3
91.Qb2 Qd2 92.Qa1 Ke3 93.Kg3 Ke2 94.Kg2 Qc2 95.Qe5 Kd1 96.Kh3 Qb3 97.Qd6
Kc1 98.Qc5 Kd1 99.Qf2 Qa3 100.Qd4 Ke2 101.Qe5 Kf1 102.Qa1 Kf2 103.Kh4
Qe7 104.Kh3 Qa3 105.Kh4 Kg2 106.h6 Qe7 107.Kh5 Qc5 108.Kh4 Qf2 109.Kg5
Qc5 110.Kh4 Qc2 111.Qe5 Kf1 112.Qf6 Qb1 113.h7 Qxh7 114.Kg3 Qc7 115.f4
Qc2 116.g5 Qf2 117.Kh3 Qe3 118.Kg4 Qe1 119.f5 Qd1 120.Kh4 a1 121.Qxa1
[/pgn]

[puzzle]
[Setup "1"]
[FEN "8/8/7P/8/6PK/q4P2/p5k1/Q7 b - - 0 106"]
106..Qe7+
[/puzzle]

Where did Ethereal went wrong after 106..Qe7+ ?

It's a draw after 108 g5, isn't it?

[puzzle]
[Setup "1"]
[FEN "8/8/7P/4Q3/6PK/5P2/p1q5/5k2 w - - 0 112"]
112. f4
[/puzzle]

The error happened on move 112. Qf6? The move here f4 would still draw the game.

This is the type of positions were the computer fails without perfect play. I am not sure what, if any TB were used in this game. But with 7 man TB, the error would not have been played by Ethereal.

And the same can be said for Stockfish. As it also made errors in the endgame. That 7 man TB probes see instantly.

Full Analysis of the game.

[pgn]
[Event "CPU-engine testing"]
[Site "?"]
[Date "2020.10.10"]
[Round "114"]
[White "Ethereal 12.75 avx2"]
[Black "Stockfish 12 200902"]
[Result "0-1"]
[ECO "C89"]
[Annotator "Tactical Analysis 4.0 (15s)"]
[PlyCount "240"]
[EventDate "2020.??.??"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. c3
d5 9. exd5 Nxd5 10. Nxe5 Nxe5 11. Rxe5 c6 12. Re1 Bd6 13. d3 Bf5 {13...Bf5
scores better than 13...Qh4.} 14. Qf3 Qf6 {C89: Closed Ruy Lopez: Marshall
Attack.} 15. Nd2 Qg6 16. Nf1 Bxd3 {The position is equal.} (16... Bg4 $5 17.
Qe4 $8 Bf5 $11) 17. Bxd5 cxd5 18. Qxd5 h6 {With the idea ...Rae8.} 19. Ng3 {[#]
} Rad8 $146 ({Predecessor:} 19... Rfd8 20. Qf3 b4 21. Bd2 a5 22. h4 Bb5 23. Bf4
bxc3 24. bxc3 Bf8 25. Be5 a4 {1/2-1/2 (50) Copar,A (2517)-Bauer,R (2565) ICCF
email 2016}) 20. Qf3 b4 21. Bd2 Bb5 {And now ...Bxg3 would win.} 22. Nf5 Kh7
23. Nd4 Bc5 24. Be3 bxc3 25. bxc3 Bc4 26. Nc6 Bxe3 27. Nxd8 {Black must now
prevent Nc6.} Bd2 $1 28. Ne6 Bxe6 {[#]} 29. Rxe6 Qxe6 (29... fxe6 30. Qxf8) 30.
Qd3+ {Double Attack} g6 31. Qxd2 $11 {Endgame KQR-KQR} Rc8 32. Rc1 h5 33. h3
Rc5 34. Re1 Qc4 35. Re3 Ra5 36. a3 Rxa3 37. Qd6 Ra1+ 38. Kh2 Ra5 ({Avoid the
trap} 38... Qf1 $2 39. Qf6 $18) 39. Rf3 Rf5 40. Rxf5 gxf5 {KQ-KQ} 41. Qe5 Kg6
42. Qg3+ Kf6 43. Qd6+ Kg7 44. Qg3+ Kf6 45. Qd6+ Kg7 46. Kg1 h4 47. Qe5+ Kg6 48.
g3 Qe6 49. Qf4 Qe1+ 50. Kh2 $1 Qxc3 51. Qxh4 a5 52. Qd8 a4 53. h4 {Strongly
threatening Qg5+.} Qf6 (53... Qc5 {looks sharper.} 54. Qg8+ Kf6 55. Qd8+ Ke6
56. Qe8+ Kf6) 54. Qg8+ Qg7 55. Qd8 Kh7 56. Qe7 f6 57. Qe6 a3 58. Qxf5+ Kg8 59.
Qd5+ Qf7 60. Qa8+ Qf8 61. Qa7 Qd6 62. Qa8+ Kh7 63. Qe4+ Kh6 64. Qe3+ Kg6 65.
Qe8+ Kg7 66. h5 f5 67. Qa8 Qe7 68. Qa5 Qd6 69. Qxf5 a2 70. Qa5 Qe6 71. g4 Qd6+
72. Kh3 Qe6 73. f3 Qb3 74. Qe5+ Kf8 75. Qf6+ Ke8 76. Qg6+ Kd8 77. Qf6+ Kc7 78.
Qe7+ Kb8 (78... Kb6 {is more complex.} 79. Qd6+ Kb7 80. Qd7+ Ka6 81. Qc6+ Ka5)
79. Qd6+ Kb7 80. Qd7+ Kb6 81. Qd8+ Ka6 (81... Kb5 {is interesting.} 82. Qd7+
Kc4 83. Qe6+ Kc3 84. Qe1+ Kd3) 82. Qa8+ Kb5 83. Kh4 Qe6 84. Kh3 Kb4 85. Qb7+ (
85. Qa7 {with more complications.} Qc4 86. Qb6+ Kc3 87. Qa5+ Kb3 88. Qb6+)
85... Kc4 86. Qb2 Kd3 87. Qa3+ Kd2 88. Qa5+ Ke2 89. Kg2 $1 Qb3 90. Qe5+ Qe3 91.
Qb2+ {Double Attack} Qd2 92. Qa1 Ke3+ 93. Kg3 {White wants to play Qe5+.} Ke2 {
...Qe1+ is the strong threat.} 94. Kg2 $1 Qc2 {Hoping for ...Kd3+.} 95. Qe5+
Kd1+ 96. Kh3 Qb3 97. Qd6+ (97. h6 {seems wilder.} Qb1 98. h7 Qxh7+) 97... Kc1 (
97... Ke2 $5 98. Qh2+ $8 Ke3 99. Qg1+ Ke2 100. Qh2+ Kd3 101. Qd6+ Ke2 102. Qh2+
$11) 98. Qc5+ Kd1 99. Qf2 Qa3 100. Qd4+ $2 (100. Qf1+ $11 Kc2 101. Qe2+ Kb1
102. Qe1+ Qc1 103. Qb4+ Kc2 104. Qa4+ Kb2 105. Qb4+ Kc2 106. Qa4+ Kb2 107. Qb4+
Kc2) 100... Ke2 $1 $19 101. Qe5+ Kf1 $1 102. Qa1+ Kf2 103. Kh4 {[#]} Qe7+ $1
104. Kh3 Qa3 105. Kh4 {[#]} Kg2 $2 (105... Qe7+ $1 $19 106. Kh3 Qe2 107. Qd4+
Kxf3 108. Qf6+ Ke3 109. Qb6+ Kd2 110. Qb4+ Kd1 111. Qd4+ Ke1) 106. h6 $11 Qe7+
107. Kh5 $1 ({Not} 107. g5 $2 Qb4+ 108. f4 Qb1 $19) 107... Qc5+ 108. Kh4 Qf2+
109. Kg5 Qc5+ (109... Qc2 $5 110. h7 $8 Qc5+ 111. Kg6 Qc6+ 112. Kg5 Qc5+ 113.
Kf6 Qc6+ 114. Ke7 Qc7+ 115. Kf8 Qc8+ 116. Kf7 Qb7+ 117. Kg8 Qc8+ 118. Kg7 Qd7+
119. Kh6 Qe6+ 120. Kg5 Qe7+ 121. Kf4 Qf7+ 122. Ke3 Qxf3+ 123. Kd2 Qd5+ 124. Kc2
Qe4+ 125. Kb2 Qxh7 $11) 110. Kh4 Qc2 (110... Qe7+ {keeps more tension.} 111.
Kh5 Kxf3) 111. Qe5 $1 Kf1 112. Qf6 $2 (112. f4 $11) 112... Qb1 {Black mates.}
113. h7 Qxh7+ 114. Kg3 Qc7+ 115. f4 Qc2 ({Inferior is} 115... Qa5 116. Qb2 $11)
116. g5 Qf2+ 117. Kh3 Qe3+ 118. Kg4 Qe1 119. f5 Qd1+ 120. Kh4 Qa1 $4 {Weighted
Error Value: White=0.02/Black=0.00. Loss on time!?} (120... a1=Q 121. Qxa1 Qxa1
122. Kh5 Kf2 123. Kg6 Kf3 124. Kf7 Qe5 125. g6 Qxf5+ 126. Ke8 Qxg6+ 127. Ke7
Qc6 128. Kf8 Kf4 129. Kg7 Kg5 130. Kf8 Kf6 131. Kg8 Qg2+ 132. Kh8 Qg7#) 0-1
[/pgn]