I played a game at LiChess a few days ago:
https://lichess.org/fipcnsrA
[pgn]
[Event "Casual Blitz game"]
[Site "https://lichess.org/fipcnsrA"]
[Date "2020.06.26"]
[Round "-"]
[White "Anonymous"]
[Black "Anonymous"]
[Result "0-1"]
[UTCDate "2020.06.26"]
[WhiteElo "?"]
[BlackElo "?"]
[Variant "Standard"]
[TimeControl "300+0"]
[ECO "D05"]
[Opening "Colle System"]
[Termination "Normal"]
[Annotator "lichess.org"]
1. d4 d5 2. e3 Nf6 3. Nf3 e6 { D05 Colle System } 4. Ne5 a6 5. g4 c5 6. g5 Nfd7 7. h4 Nxe5 8. dxe5 Nc6 9. f4 b5 10. a4 Bb7 11. axb5 axb5 12. Rxa8 Qxa8 13. Bxb5 Qa5+ 14. Nc3 d4 15. Bxc6+ Bxc6 16. exd4 Bxh1 17. dxc5 Bxc5 18. Ke2 Qa8 19. Qf1 Bd5 20. h5 Bc4+ { White resigns. } 0-1
[/pgn]
I was black so I won. I want to bring some positions: after 12.- ..., Qxa8; after 13.- Bxb5; after 13.- ..., Qa5+; and after 14.- Nc3.
[d]q3kb1r/1b3ppp/2n1p3/1pppP1P1/5P1P/4P3/1PP5/1NBQKB1R w Kk - 0 13
[d]q3kb1r/1b3ppp/2n1p3/1BppP1P1/5P1P/4P3/1PP5/1NBQK2R b Kk - 0 13
[d]4kb1r/1b3ppp/2n1p3/qBppP1P1/5P1P/4P3/1PP5/1NBQK2R w Kk - 1 14
[d]4kb1r/1b3ppp/2n1p3/qBppP1P1/5P1P/2N1P3/1PP5/2BQK2R b Kk - 2 14
The online analyzer of LiChess, SF 10+ ASMJS, has problems with these positions.
- First position: it brings +0.1 (13. Bxb5 Be7) at depth 18/18.
- Second position: it realizes that black is better only after depth 16/18.
- Third position: jumps from -0.2 (depth 16) to -2.0 (depth 17).
- Fourth position: jumps from +0.4 (depth 15/18) to -1.9 (depth 16/18).
In my own analysis with SF 11 (Multi-PV = 7) with one thread for being deterministic and hash cleared between moves, the evolution of the eval:
a) Of 13.- Bxb5 is:
Code: Select all
From white POV:
[...]
d9/17 ev=+0.49 (rank 1)
d10/17 ev=+0.70 (rank 1)
d11/18 ev=+0.58 (rank 1)
d12/20 ev=+0.45 (rank 1)
d13/20 ev=+0.44 (rank 1)
d14/24 ev=+0.24 (rank 1)
d15/24 ev=+0.18 (rank 1)
[...]
Rank > 7 for depth > 15.
(Eval < -0.69 for depth = 15).
b) Of 13.- ..., Qa5+ is:
Code: Select all
From white POV:
[...]
d9/14 ev=+0.52 (rank 3)
d10/18 ev=+0.44 (rank 3)
d11/19 ev=+0.06 (rank 1)
d12/20 ev=-0.36 (rank 1)
d13/22 ev=+0.11 (rank 2)
d14/30 ev=-0.61 (rank 1)
d15/25 ev=-0.63 (rank 1)
d16/27 ev=-0.82 (rank 1)
d17/31 ev=-0.89 (rank 1)
d18/33 ev=-2.92 (rank 1)
d19/26 ev=-3.46 (rank 1)
d20/36 ev=-2.96 (rank 1)
d21/40 ev=-3.00 (rank 1)
d22/37 ev=-3.55 (rank 1)
------------
c) Of 14.- Nc3 is:
Code: Select all
From white POV:
[...]
d9/15 ev=+1.13 (rank 1)
d10/16 ev=+0.25 (rank 1)
d11/18 ev=+0.32 (rank 1)
d12/19 ev=+1.33 (rank 1)
d13/21 ev=+0.78 (rank 1)
d14/24 ev=+0.16 (rank 1)
d15/26 ev=-0.31 (rank 1)
d16/30 ev=-0.60 (rank 1)
d17/33 ev=-0.23 (rank 1)
d18/29 ev=-0.30 (rank 1)
d19/34 ev=-0.33 (rank 1)
d20/40 ev=-2.69 (rank 1)
d21/38 ev=-2.90 (rank 1)
------------
d) Of 14.- ..., d4 is:
Code: Select all
From white POV:
[...]
d9 ev>+1.26 (rank>7)
d10 ev>+1.29 (rank>7)
d11/16 ev=+0.03 (rank 3)
d12/18 ev=-1.75 (rank 1)
d13/14 ev=-2.61 (rank 1)
d14/19 ev=-2.74 (rank 1)
d15/21 ev=-3.02 (rank 1)
d16/28 ev=-3.15 (rank 1)
d17/30 ev=-3.03 (rank 1)
d18/36 ev=-3.22 (rank 1)
------------
Any opinions? Other engines behaves in the same way?
Regards from Spain.
Ajedrecista.