Many poaple were of the opinion, Leela has big deficits in the endgame. Perhaps. But not in the game against Nirvana.
37: Nirvana 2.4 - LCZero v19.1-RC2-11248 1/2-1/2, TCEC Season 14 - Division 2 2018
[d]8/p4p2/7k/3r2p1/1P5p/2Bp2P1/P2RbP1P/6K1 b - - 0 1
In this position Lc0 played 35...h3?! and saw itself with 6 pawns in the advantage.
Ok, the evaluation was maybe wrong...Analysis by Stockfish 091218 64 POPCNT:
35...Kh5 36.Rb2 Kg4 37.Bd2 f5 38.b5 Rc5 39.a4 Rc2 40.Rxc2 dxc2 41.f4 hxg3 42.fxg5 f4 43.hxg3 Kxg3 44.Be1+ Kg4 45.Bd2 Kxg5 46.Kf2 Bc4 47.Kf3 Bd5+ 48.Kf2 Kf5 49.Ke2 Ke4 50.Kf2 Bb3 51.a5 Bc4 52.b6 axb6 53.axb6 Bd5 54.Ke2 f3+ 55.Kf2 Kd3 56.Bf4 Kc4 57.Bc1 Kc3 58.Kg1 Kb4 59.Kf2 Kc4 60.b7 Bxb7 61.Ke3 Kb3
-/+ (-1.47) Depth: 41/56 00:04:17 746MN, tb=187488
Stockfish wants to plays here 35...Kh5 (with 5-men SYZYGY on my PC) but can not see a clear advantage.
37: Nirvana 2.4 - LCZero v19.1-RC2-11248 1/2-1/2, TCEC Season 14 - Division 2 2018
[d]8/p4p2/8/P5p1/1P1r2k1/3p2Pp/1R1BbP1P/6K1 b - - 0 1
Position after move 39. a5. In the game follows now 39...a6?! with draw. But: is 39...a6 real an blunder?
Analysis by Stockfish 091218 64 POPCNT:
39...Rc4 40.b5 Rc2 41.Rxc2 dxc2 42.b6 axb6 43.axb6 Ba6 44.Bc1 f6 45.b7 Bxb7 46.f4 gxf4 47.gxf4 Kf3 48.Kf1 Bd5 49.Ke1 Kg2 50.Ke2
-+ (-1.78) Depth: 60/72 00:04:28 909MN, tb=1526164
Is this won? Possible variant:
39... Rc4 40. b5 Rc2 41. Rxc2 dxc2 42. b6 axb6 43. axb6 Ba6 44. Bc1 f6 45. f4
gxf4 46. b7 Bxb7 47. Bxf4 Kf3 48. Kf1 f5 49. Ke1 Be4 50. Bh6 Kg2 51. Bf4 Kxh2
52. Kf2!
And now?
[d]8/8/8/5p2/4bB2/6Pp/2p2K1k/8 b - - 0 1
Analysis by Stockfish 091218 64 POPCNT:
52...Kh1 53.Bc1 Bb7 54.Bg5 Ba6 55.Bc1 Bc4 56.Bf4 Bb5 57.Bd2 Bd7 58.Be3 Bc6 59.Bf4 Bf3 60.Bd2 Bg2 61.Bg5 Bb7 62.Be3 Ba8 63.Bd2 Bf3 64.Be3 Bd1
-/+ (-1.40) Depth: 64/65 00:00:57 294MN, tb=618921
This is simple draw. Stockfish sees it with syzygy... after a longer Analysis.