Nolot Position #8. No win?

[MikeGL]

Is the last position in Nolot (pos. #8) buggy?
I don't have the source, please share if you have this in your database.

I just rechecked with SF12 it shows a drawish game even with 2 Q promotions by white.
[pgn]
[Event "NOLOT revisited"]
[Site "talkchess"]
[Date "2021.01.07"]
[Round "?"]
[White "SF"]
[Black "SF"]
[Result "*"]
[BlackElo "2400"]
[Time "19:09:07"]
[WhiteElo "2400"]
[TimeControl "14400+30"]
[SetUp "1"]
[FEN "r1b3k1/p2p1nP1/2pqr1Rp/1p2p2P/2B1PnQ1/1P6/P1PP4/1K4R1 w - - 0 1"]
[Termination "unterminated"]
[PlyCount "14"]
[WhiteType "human"]
[BlackType "human"]
[Comment "bm Rxh6; id \"Position 11\";"]

1. Rxh6 Nxh6 2. Qg5 Nf7 3. Qd8+ Nxd8 4. h6 Qd4 5. h7+ Kf7 6. g8=Q+ Ke7 7.
h8=Q Kd6 *
[/pgn]


[d]r1b3k1/p2p1nP1/2pqr1Rp/1p2p2P/2B1PnQ1/1P6/P1PP4/1K4R1 w - - 0 1
Nolot Position #8 (bm Rxh6)

[elcabesa]

according Vajolet Rxh6 is the best move (at depth 32)

[MMarco]

I ran HekaStockfish 270920 to depth 40 with mpv=2 and it couldn't find a win either:

Code: Select all

[40] 0.00 Txh6 Cxh6 Dg5 Cf7 Dd8+ Cxd8 h6 Dd4 h7+ Rf7 g8D+ Re7 Tg7+ Rd6 h8D Dxd2 Dxd8 Dd1+ Rb2 Dd4+ Ra3 Dc5+ b4 De3+ Fd3 Dc1+ Rb3 Db1+ Ra3

[40] -2.52 Fxe6 dxe6 Tf6 De7 Dh4 Fd7 Txf4 Dxh4 Txh4 Cg5 Thg4 Rxg7 Txg5+ hxg5 Txg5+ Rf7 Txe5 Th8 a4 Rf6 Tc5 bxa4 bxa4 Th7 Ta5 Fe8 h6 Tb7+ Rc1 Rg6 c3 Rxh6 Te5 Ff7 Tc5 Tc7 Rc2 Rg6 Rd3 Rf6 Rd4 e5+ Re3 Re6 d4 exd4+ cxd4 Rd6 Tg5 Fe6 Ta5 Tb7 Ta6 Fc4 Ta5 Th7 Tc5 Th3+ Rf4 Fd3 e5+ Rd7 d5

d:41/73 1:Txh6 t:203.6 n:320M nps:1573k tb:180k h:97

[Jouni]

Not byggy. No win claimed. Rxh6 best move.

[Dicaste]

Best move is Rxh6 just not winning move.

[elcabesa]

not so bad to achieve a draw when you are 2 pieces down

[Jouni]

Nolot suite has positions, that took 20 hours for Deep Thought/Blue to solve and some were unsolved. SF solves all now instantly except buggy 9 .

[Dann Corbit]

I have this:
r1b3k1/p2p1nP1/2pqr1Rp/1p2p2P/2B1PnQ1/1P6/P1PP4/1K4R1 w - - acd 49; bm Rxh6; ce 0; c0 "Teichmann-NN, Zurich 1920"; c3 "Rxh6"; pv Rxh6 Nxh6 Qg5 Nf7 Qd8+ Nxd8 h6 Qd4 h7+ Kf7 g8=Q+ Ke7 h8=Q Kd6 Rg7 Qxd2 Qxd8 Qd1+ Kb2 Qd4+ Kb1 Qd1+;

Calculated a long time ago because the depth is only 49

[MMarco]

Cfish 11a sees a draw at depth 50 from the position at the end of the line you indicated:

[d]r1bn2QQ/p2p4/2pkr3/1p2p3/2BqPn2/1P6/P1PP4/1K4R1 w - - 1 8

Code: Select all

[50] 0.00 Tg7 Dxd2 Dxd8 Dd1+ Rb2 Dd4+ Rb1

[50] 0.00 Df8+ Rc7 Dxd8+ Rb7 Tg3 bxc4 bxc4 c5 Tb3+ Tb6 Dg5 Ce6 Dgxe5 Dxc4 Dhh2 Txb3+ axb3 Df1+ Rb2 Da6 Dd5+ Dc6 Dhd6 a5 D5xc6+ dxc6 c3 Ta6 De7+ Rb8 Dd6+

d:51/40 1:Tg7 t:958.2 n:2135M nps:2229k tb:833k h:100

[Werewolf]

Nolot suite has positions, that took 20 hours for Deep Thought/Blue to solve and some were unsolved. SF solves all now instantly except buggy 9 .

Do you have a source for this please?