How your engine will play in the endgame?

[bastiball]

The game should be favor to white but what happened there?

[pgn][Event " Mini-TCEC Tournament: Season 1 - League 3"]
[Site "CCRL"]
[Date "2022.01.27"]
[Round "1"]
[White "Marvin 5.2.0"]
[Black "Winter 0.9.8"]
[Result "1/2-1/2"]
[TimeControl "0/1800+5"]
[Time "22:58:10"]
[Board "95"]
[Termination "adjudication by egtb"]
[ECO "A48"]
[Opening "King's Indian"]

1. d4 Nf6 2. Nf3 g6 {A48: King's Indian, East Indian defence}
3. Nc3 d5 4. Bf4 Bg7
5. Qd2 Bf5 6. O-O-O Nbd7
7. Ne5 {+0.19/23 65171 21083542} c6 {-0.15/21 100975 26252230 219/499/281} 8. f3 {+0.28/23 63160 17959443} Nxe5 {-0.21/21 51006 15391918 223/471/305}
9. Bxe5 {+0.46/23 61222 19804706} h5 {-0.32/22 67987 20320700 294/286/419} 10. Kb1 {+0.51/23 59349 31335011} Kf8 {-0.33/20 90166 11678012 217/435/347}
11. h3 {+0.63/22 57536 24835913} Kg8 {-0.26/22 64913 24286663 206/483/309} 12. Qe1 {+0.61/24 55785 33405554} a5 {-0.34/23 82518 16089091 169/526/304}
13. e4 {+0.83/23 54094 27122131} Be6 {-0.49/21 58212 21531438 261/287/452} 14. Bd3 {+0.82/23 74453 44622599} a4 {-0.48/22 54595 23881726 295/223/481}
15. a3 {+0.78/22 58482 31054103} b5 {-0.51/21 56539 21289252 244/312/443} 16. Rf1 {+0.97/22 48359 25357034} Rh7 {-0.47/19 70296 20382919 193/429/377}
17. Ne2 {+1.13/20 46913 14402036} Qa5 {-0.69/22 48600 22185833 91/552/356} 18. Qxa5 {+1.15/23 45501 21156019} Rxa5 {-0.85/23 33850 16563476 141/396/462}
19. Nf4 {+1.21/24 44166 21454329} dxe4 {-0.78/24 43155 19375187 151/399/448} 20. fxe4 {+1.29/24 42862 29782744} Bc8 {-0.76/24 32016 16553752 88/534/377}
21. d5 {+1.79/24 54978 31370717} Bb7 {-1.29/22 43612 22720744 43/448/508} 22. d6 {+2.61/24 39933 25680079} exd6 {-1.64/24 30312 17651099 21/392/586}
23. Bc3 {+2.09/26 63584 34688006} Ra8 {-1.56/24 41920 21496594 18/418/563} 24. Nxg6 {+2.39/27 36815 25545141} fxg6 {-1.75/25 54275 7022625 36/332/631}
25. Bxf6 {+2.39/27 37954 29550437} Rf8 {-1.60/23 41806 23881374 11/420/568} 26. Be7 {+2.35/28 34656 19411731} Rxf1 {-1.93/25 24893 14473317 24/313/662}
27. Rxf1 {+2.22/30 33668 15746887} Be5 {-1.89/26 32436 17812489 20/330/649} 28. Rf8+ {+2.27/29 32710 20143688} Kg7
29. Rb8 {+2.18/25 41095 27521611} Kf7 {-2.06/26 32871 17654746 38/253/708} 30. Rxb7 {+3.06/28 30585 17197926} Ke6 {-1.06/30 30637 14054236 34/539/426}
31. c4 {+3.16/30 29730 12398163} b4 {-1.06/32 36706 17635580 34/539/426} 32. axb4 {+3.08/30 28909 13321521} Rxe7 {-1.11/32 31606 14468858 3/584/412}
33. Rxe7+ {+3.11/30 28111 13145802} Kxe7 {-1.06/37 25802 12656592 15/575/408} 34. Bc2 {+3.08/34 27341 20387015} Kd8 {-1.11/33 22585 12210859 3/582/414}
35. Bxa4 {+3.18/33 26596 21593880} c5 {-1.11/37 22680 12682472 4/581/414} 36. b5 {+4.01/30 25875 22805027} Kc7 {-1.11/37 20957 11073681 11/567/421}
37. Bc2 {+4.26/28 42369 31512305} Kb6 {-1.11/38 24451 8334065 3/583/413} 38. b3 {+4.40/31 23938 12140533} Ka5 {-0.93/31 36785 4790386 44/562/393}
39. Bd1 {+4.43/32 23303 20362772} Kb6 {-1.28/34 21857 13537324 9/519/471} 40. Kc2 {+4.49/33 22693 14549848} Ka5 {-1.28/30 34218 3444135 9/518/471}
41. Kd3 {+4.57/34 22103 16914477} Kb6 {-2.48/26 25820 12362025 0/250/749} 42. Ke3 {+4.58/36 21533 19956040} Kc7 {-2.46/30 19805 9448660 0/252/747}
43. g4 {+4.76/35 20983 17065063} hxg4 {-2.47/29 21280 10060593 3/246/750} 44. Bxg4 {+4.76/36 20449 13610813} Kb6 {-2.46/34 17584 9611162 0/252/747}
45. Kf3 {+4.76/35 19935 15822733} Bc3 {-2.47/34 15438 10352665 0/252/747} 46. Bd7 {+4.74/35 19437 12288752} g5 {-2.47/35 14656 8426041 0/252/747}
47. Kg4 {+4.70/36 18956 13564567} Bd2 {-2.47/37 15321 9201232 0/252/747} 48. Kf5 {+4.66/36 18490 7625523} Bc1 {-2.46/35 20483 9478384 0/252/747}
49. Bc6 {+4.66/32 18041 8865861} Bd2 {-2.46/35 13513 7904238 0/252/747} 50. Be8 {+4.59/29 17606 11556823} Kc7 {-2.46/35 19809 11113254 0/252/746}
51. Bh5 {+4.59/29 17185 8208778} Kb7 {-2.46/33 14756 8636311 0/252/747} 52. Ke6 {+4.41/28 16779 13343225} Bf4 {-2.46/36 14656 8389681 0/252/747}
53. Ke7 {+4.43/34 16386 11530165} Be5 {-2.46/35 16101 10774132 0/252/746} 54. Bf3 {+4.44/34 16008 10999719} Kb6 {-2.46/36 12023 8042963 0/252/747}
55. Bh1 {+4.40/36 15640 8685368} Bg3 {-2.46/38 23495 15159952 0/252/747} 56. Kf6 {+4.38/33 15290 6657364} Bh4 {-2.46/35 12227 5814082 44/165/790}
57. Kf5 {+4.88/33 14944 14674177} Ka5 {-2.46/35 16807 10285269 0/252/747} 58. Bf3 {+4.76/35 14617 9495085} Kb6 {-2.46/36 12333 7977573 0/252/747}
59. Kg6 {+4.76/34 14292 8065923} Ka7 {-2.46/37 15270 10812929 0/252/746} 60. Bh5 {+6.16/26 13982 8870000} Kb7 {-2.46/36 14645 10197817 0/252/746}
61. Kf5 {+4.76/32 13682 12288143} Kb6 {-2.46/35 10732 6370010 4/245/750} 62. Bf7 {+5.15/28 20277 13644339} Kb7 {-2.46/35 12632 7605716 0/252/747}
63. b4 {+9.76/26 14385 13070922} Kb6 {-1.93/30 11941 7938487 0/360/639} 64. bxc5+ {+8.71/29 12581 10514116} Kxc5 {-2.15/31 19163 5189232 0/313/687}
65. Bh5 {+11.68/29 14451 12495633} Bg3 {-2.92/27 15185 11683821 0/185/815} 66. Kxg5 {+17.03/26 16369 19792794} Kxc4 {-3.61/27 9510 8704843 0/111/888}
67. b6 {+32.22/23 18178 16503127} Kc5 {-0.83/32 9684 10097286 1/684/315} 68. b7 {+41.84/20 14016 12865760} d5 {-2.58/33 12465 14532284 0/234/765}
69. Kg4 {+54.23/20 54420 41734893} Bc7 {-2.09/29 17000 16481403 1/323/675} 70. e5 {+0.00/34 9233 2813066} Bxe5 {-0.09/32 9953 12065255 5/951/43}
71. h4 {+0.00/41 9104 3082234} Kb6 {-0.06/36 10843 13718334 0/973/26} 72. Kf5 {+0.00/54 8960 3934112} Bd6 {-0.06/39 11663 15913928 0/974/25}
73. Ke6 {+0.00/50 8828 3919761} Bg3 {-0.06/39 9115 13337294 0/976/23} 74. Bf3 {+0.00/53 8699 3814600} Kxb7 {-0.06/41 8835 13056031 0/976/23}
1/2-1/2

[/pgn]

[Ajedrecista]

Hello:

According to SF 14 and the full set of 3, 4 and 5-man Syzygy EGTB, there was a huge eval drop after 69.- Kg4, reaching drawish evals, instead of evals > +10 with 69.- exd5, which was the only winning move. White wins after 69.- exd5 according with online 7-man Syzygy EGTB:

https://syzygy-tables.info/?fen=8/1P6/8 ... _b_-_-_0_1

69.- exd5, Kxd5 leads to a checkmate in 20 moves according to 6-man EGTB hosted at Shredder web.

Regards from Spain.

Ajedrecista.

[bastiball]

Hello:

According to SF 14 and the full set of 3, 4 and 5-man Syzygy EGTB, there was a huge eval drop after 69.- Kg4, reaching drawish evals, instead of evals > +10 with 69.- exd5, which was the only winning move. White wins after 69.- exd5 according with online 7-man Syzygy EGTB:

https://syzygy-tables.info/?fen=8/1P6/8 ... _b_-_-_0_1

69.- exd5, Kxd5 leads to a checkmate in 20 moves according to 6-man EGTB hosted at Shredder web.

Regards from Spain.

Ajedrecista.

Marvin has 6men syzygy right there. Looks like Marvin didn't see the winning move that led to a draw. Thanks for the information! Engine do blunders too.

Regards,
Basti